I'm in need of a web-based system that will help me improve my fleet management. The key task of the system will be tracking the location of all types of vehicles in real-time. Key Features: - Real-time vehicle tracking: I need a system that updates the location of the vehicles in real-time. This is crucial for me to manage my fleet effectively. - Compatibility with all types of vehicles: The system should be able to track all types of vehicles, from commercial trucks to personal vehicles. Ideal Experience: - Proven track record in developing web-based tracking systems. - Strong understanding of GPS tracking in vehicles. - Familiarity with fleet management systems. - Experience in developing real-time updating systems.
...selling legal drafts. This will involve creating a seamless user experience for browsing, selecting, and purchasing these drafts. - **Post-Purchase Delivery**: After a customer purchases a legal draft, I would like them to receive an email link to download the document. This will necessitate a system that can automatically generate and send out these emails upon successful transactions. - **Payment Integration**: The website should support multiple payment methods, including credit/debit cards, net banking, and digital wallets. This will cater to a wider audience and provide convenience for customers. The ideal freelancer for this project should have experience in e-commerce website development, particularly in creating systems for selling and delivering digital product...
...propio () y estamos buscando perfiles para reforzar de manera remota nuestra capacidad de desarrollo. 1. PERFILES BUSCADOS: En este momento estamos interesados en perfiles JAVA2EE con experiencia demostrada y excluyente en: a- Trabajo en equipo colaborativo, español nativo. b - JAVA2EE con experiencia superior a 2 años c- Conocimientos en programación Java Swing d- Experiencia en programación previa demostrable de al menos 1 año en programas de gestión tipo ERP, SGA, POS, CRM, facturación, contabilidad, etc. e- Entorno de trabajo sobre GITHUB, JIRA, ECLIPSE f- Conocimientos de programación SQL sólidos 2.- CERTIFICACIÓN PREVIA DE LOS PERFILES. ...
Estoy actualizando un proyecto a primeFaces 6.2 (Java, JSF, JBoss 7.1), pero tengo algunos errores, quiero a alguien que me ayude con tutorías, pago por horas, solo gente que domine el español.
I'm currently working on a project that involves compiler construction in Java. I'm looking for a professional who can deliver effective semantical analysis ensuring that my project successfully passes private tests. The ideal candidate should have a background in compiler construction, particularly with hands-on experience in Java. Key requirements include: - In-depth understanding of compiler construction principles - Proven experience in semantic analysis - Proficient in Java programming - Ability to deliver error messages for incorrect syntax - Familiarity with integrating semantical analysis into existing Java projects This project has already integrated the semantical analysis, and you will be required to enhance it to effectively...
I'm in need of a skilled electrical engineer who can handle the installation of an electrical system, focusing primarily on security systems. The successful candidate should have experience in: - Electrical system installation - Security systems installation - Strong knowledge of electrical components and their purpose This project is focused on a single property, which may be residential, commercial, or industrial. I'm seeking a professional who can execute this task efficiently and with high attention to detail.
Greetings! I am in need of a dedicated full-time system administrator in the field of Information Technology. The right candidate has a passion for managing, protecting, and upgrading system networks in an IT environment. Requirements: - Deep understanding of system administration and associated responsibilities - Proficiency in providing technical support and server maintenance - Experienced in diagnosing and resolving hardware, software, and networking issues - Ability to lead software and hardware installation and upgrade projects - Expertise in applying IT solutions that increase operational efficiency Experience: - Previous work in a similar role would be highly valued - Proven experience as a System Administrator, Network Administrator, or a similar role...
I'm seeking a qualified automation developer to create an automation framework in Java, specially tailored for the execution of functional tests snd regressiontests. This project requires: - Fluency in Java language programming, with demonstrable experience in developing automated frameworks. - A strong background in software testing, particularly in thetesting area. - A deep understanding of scalable systems, capable of growing to meet increasing needs. With your expertise in this domain, you should facilitate the task of creating, implementing and scaling functional tests. Please ensure your work is properly documented for future maintenance and scaling. It is crucial for me that the framework can be effortlessly scaled and served according to the evolving requiremen...
Hello, I am looking for a freelancer who has already set up a cold mailing system several times (with proof/screenshots) and can do this for me. First the selection of the system, then the setup of the mailing server and the warming up of the emails. I need someone with experience, so please write me first in your reply: "Hi Dennis, I recommend ...system" and your fixed price to set up. if not, i will not read, because here are so many bots :-) We will then chat about what you need (domain, certificates,...) What I don't want is my own solution, but a cloud system. Thank you
I'm seeking a Business Assistant who can support the operational aspects of my Food and Beverage business. **FEMALES ONLY** The role will primarily involve: - Scheduling meetings: Your responsibility would be to manage my calendar effectively and ensure that my time is utilized...visiting site locations. Your support will be required on an 'as needed' basis, meaning the workload may vary from week to week. Flexibility and the ability to adapt to changing schedules and demands will be a key part of this role. Ideal candidates will have: - Strong research skills and experience with interpreting market data and trends - Should know business terminologies and some basic banking. - Good organizational skills, particularly in managing calendars and scheduling. *FRESH...
vb 2012 video and sound recorder. Auto record to file when motion/sound is detected. Auto save file if no motion/sound is detected for 5 seconds. exe File must be compact and small and not dependent on other dll or ocx. Auto detect existing cam and video device on PC. I should be able to compile it on my PC. Note there are a lot of samples on Chat GTP.
I'm seeking an experienced web developer w...their comprehensive understanding of Django and front-end technologies, the ideal candidate will deliver quality and maintainable code, and provide insightful recommendations for improving the performance and usability of the website. Previous experience in machine learning is beneficial, though not an overarching requirement. What is the work: We have a college project named crop Recommendation System using ML. Which make prediction of which crop farmers can grow as per soil and as per prices of various crops in current market. We have collected required dataset and coded ML code. We getting problem to connect this ML code to frontend to show prediction output on site we have to make just connect this ML code to frontend to show ...
I'm looking to create an engaging gaming website. The crucial part of this project is the virtual currency system that will be implemented. - The website should chiefly host skill games. - Incorporate a distinct virtual currency system that will allow users to: - Participate in games using the virtual currency. - Exchange the virtual currency for real, tangible items. Ideal freelancers for this project should be experienced web developers with a solid grasp of gaming interfaces and developing secure, functional virtual currency systems. Experience in e-commerce would also be beneficial, as the exchange aspect of the virtual currency system is similar.
I'm seeking a Java developer with intermediate-level skills and proficiency in Gradle. The primary tasks will involve: - Building and maintaining software applications. Experience in this is paramount as the essence of the job involves continuous development and upkeep of the software. Ideal skills and experience would include: - Intermediate-level knowledge and experience in Java and Gradle. - Proven track record of writing clean, efficient code. - Good troubleshooting skills with the ability to debug applications effectively. While I skipped specifying a particular software development methodology, I value adaptability and a mindset oriented towards learning. Being able to navigate various methodologies will be viewed as a plus.
I'm seeking a skilled entry-level Investment Banking Analyst to assist with a range of tasks within the Financial Services sector. Key Responsibilities: - Conducting comprehensive financial modeling - Carrying out company valuations - Performing in-depth market research Experience: - Ideal candidate should have a strong academic background in finance, economics or related field - Ability to use financial models and valuation methods is crucial - Prior experience in the financial services sector would be an advantage Skills: - Proficiency in Excel and financial modeling software - Strong analytical and problem-solving skills - Excellent research and report-writing capabilities If you're a finance graduate with a knack for numbers and a passion for the stock market, I&...
I am in need of a proficient software developer, specifically for web development. The project involves the creation of a website focusing on a content management system. I am geared towards using the Java stack for the task. Key Requirements: - Skill in and a vast understanding of the Java stack. - Prior experience in web development. - Experience in developing content management systems. - Efficiency and ability to meet deadlines. This task is perfect for a web developer who has deep-rooted understanding and experience in utilizing the Java stack and creating content management systems. I look forward to receiving your bids.
The developer should have the following skills and experience: 1. Proficient in Java, Kotlin and other programming languages; 2. Have a deep understanding of Android platform, familiar with Android SDK and related tools; 3. -- If you have an already published app you can! Out -- for s-a-l-e! . If you are interested, please feel free to contact us and look forward to further communication with you.
...platforms, preferably in the context of milk collection and animal food sales businesses. Strong proficiency in Android app development, with a focus on creating user-friendly interfaces and seamless functionality. Adept at UI/UX design, with a portfolio demonstrating visually appealing and intuitive projects tailored to similar industries. Familiarity with back-end programming languages such as Java, Python, or PHP, and experience in database management. Prior experience in integrating third-party systems and APIs for enhanced functionality. Excellent communication skills and the ability to collaborate effectively in a remote work environment. If you are a creative and experienced web and Android developer with a passion for enhancing business operations through digital solution...
I'm in need of a skilled electrical engineer to help me set up a radio-based surveillance system in my property. - I have yet to decide whether the system will be placed indoors, outdoors or both so your prior experience in both environments is desirable. - The project does not have a predetermined number of areas or rooms that need covering, so I'm looking for someone who can help me plan and implement the system in the most efficient and effective way. Ideal candidate should have experience in: - Design and installation of surveillance systems, particularly radio-based systems. - Ability to work with both indoor and outdoor security setups. - Planning and executing a system across multiple areas. Your insights and recommendations regarding the ...
Requirements: It is required to create a comment system like the one on the following website You can select I had it, I want it, I have it, state, in what season or moment the fragrance should be used, reliability, star rating of the fragrance, gender, price and at the end a written comment. The list of comments shows the icons of each option you have selected, The idea is to make everything the same but with a different appearance. The system must work in WordPress and must be worked on until it is 100% functional. My website is made with Wordpress + Elementor. STEP 2: After having the system completed in its entirety, some comments that are in a json must be imported; they must go to each of the fragrances, which
Hello I am interested in developing a website with an integrated voting system. Below are the main features and functionalities it should include: Visual Appearance and Basic Functionalities: Page: Displays the top 7 voted candidates from the last 24 hours (top 1 to top 7). Below, there will be a "More" button, which will allow users to view 8 additional candidates each time it is clicked. Cards: Each card will display the voting candidate's information including an image, name, description, social media links, gender, etc. It will also show the number of votes in real time and include two voting buttons: A positive vote button (+10 points). A negative vote button (-4 points). : The site will feature different ranking filters: last 24 hours, weekly, monthly,
I'm seeking an experienced developer to integrate an AI chatbot into my existing Android Java chat application. This is a minor project, significantly aimed at enhancing customer engagement, user experience, and automating customer service. Key Features: - Proficient in Natural Language Processing (NLP) to facilitate smooth and efficient interactions with users. - Capable of directing users to live support whenever required, providing a seamless handover from AI to human support. Ideal Skills: - Strong experience in Java and Android application development. - Prior work with AI chatbot integration, NLP specifically. - Excellent problem-solving skills and creativity in implementing AI functionality. Do you own these skills? I would love to hear from you. Let's ...
I'm in need of an experienced Java Selenium APIs tutor to help me automate test cases for two business web applications. Requirements: - Expertise in Java programming and IntelliJ for test automation. - Proficient in Selenium and APIs, particularly in creating automation scripts. - Knowledge of Cucumber for implementing BDD framework. - Ability to guide and advise on the automation process. This is a collaborative effort, I'm looking for someone who can not only help automate my test cases, but also teach me how to do it effectively. Also due to Coles VPN and restricted access, the job has to be online with connecting to my computer either through meetings with share screen or sharing through git hub!
I have a Java application currently running on Java 8 that demands an urgent certificate update. The application connects with an AWS RDS instance using PostgreSQL and current requirements necessitate an upgrade to a new certificate. Upon successful import and upgrade of the new cert in the AWS environment, the change then needs to be effectively verified through a manual testing process. Skills & Experience required: • Profound understanding of and substantial experience in Java 8 • Experienced working with AWS RDS (specifically PostgreSQL) • Capable of certificate upgrade & import in AWS • Well-versed in manual testing procedures. Please, only submit a proposal if you can meet the aforementioned conditions.
I need someone who can develop and debug test automation, with a Java/Selenium/Maven/TestNG framework, for an Intranet web application. The automator should be located in Washington, DC, USAor in a metro-accessible DMV (DC/Maryland/Virginia) location. I need someone who can work next to me physically, as I am unable to allow anyone to remotely access my laptop because the project is running on a work computer and network, which is why I need someone local. Nobody on my team or project has experience with automation, and I'm having trouble with several framework design difficulties and test execution issues, which is why I need help. Outline of requirements: - Proficiency in Java programming language, Selenium, and TestNG - Be located in a metro-accessable DMV area, and ...
We have custodial crypto wallet app and system on cloud environment. Please create design document for that. Language Java platform Heroku for app side and DB side on AWS
I need a top-notch WordPress website for my bistro cocktail bar: it should be visually appealing, easy to use and, above all, have a booking system and ability to sell my organic products and merchandise online Main features: - Reservation booking system. Customers should be able to easily check availability, select their preferred time and date and make a reservation. - Attractive photo gallery - Online purchasing system for our products Ideal skills and experience: - WordPress Expertise: You should have a proven track record of creating visually stunning and user-friendly WordPress websites. - Experience building booking systems: I'm looking for someone who has experience integrating and customizing booking systems. - UI/UX design: It is essential that the web...
...technology. Key Responsibilities: - Designing and implementing machine learning models to predict and analyze customer behavior - Developing and integrating natural language processing algorithms for sentiment analysis and customer feedback processing - Ensuring the AI system is well-equipped to provide personalized and efficient services to our customers Ideal Candidate: - Proven experience in Machine Learning and NLP, with a strong portfolio of successful projects - Proficiency in Python (preferred) and familiarity with Java and C++ for AI development - Strong problem-solving skills and an innovative mindset to drive AI-driven customer satisfaction improvements - Excellent communication skills to collaborate with the team and understand our customer needs Your exper...
I'm looking for a skilled individual who can create a sketch for a rather specific and interesting project. Key Requirements: - Utilize a crash sensor micro switch: This element is the core of the project as it's designed to respond to an impact and trigger a series of events. - Trigger a 12v motor: The motor should start running as soon as the sensor detects an impact. - Simultaneously play a short MP3 file: The audio should begin playing once the sensor is activated, but it should be less than 30 seconds in duration. - Activate a solenoid latch: This component is crucial as it performs a critical function in the project. The solenoid latch should be triggered once the motor is on and the music is playing. - Stop the music and motor: Once the solenoid latch has been ac...
Many people say this is not possible but there are a few apps that can do this. I need an Android project in JAVA not Kotline and maybe with C++ code that integrates seemlessly which allows me to record a phone call. Technically I do not need a recorded file - I need an AudioRecord object returned that I can plug into my current code so I can process the phone audio NOTE: This is not for voice but for things like dial tones etc so AudioSource.VOICE_RECOGNITION does not work because it seems to block / noise cancel the audio I need.
I'm looking for a capable Java Spring Boot backend developer, with a special emphasis on user authentication and authorization. Your tasks will comprise of: - Designing and integrating a robust two-factor authentication system - The two-factor authentication must employ the SMS methodology Qualifications include substantial experience with Java Spring Boot, depth of knowledge in creating and managing secure user authentication systems, and a comprehensive understanding of two-factor authentication, preferably with SMS authentication. Please provide examples of your prior work related to user authentication and two-factor authentication systems. I can't wait to collaborate with someone who's as enthusiastic about this project as I am!
I am currently in need of an expert in the Clojure language to assist with several aspects of a project I'm undertaking. My primary goal is to develop a scalable system from the ground up. Here are the areas I need help with: 1. **Syntax and Basic Usage**: I need guidance on how Clojure syntax operates, as well as its basic use. 2. **Functional Programming Concepts**: I'm looking for a deeper understanding of Clojure's functional programming concepts. 3. **Clojure Libraries and Frameworks**: Knowledge about various Clojure libraries and frameworks to utilize in my project is required. The project will be developed in a local development environment. Therefore, experience working within this type of environment and setting it up is essential. Ideal freelancers s...
I am seeking an expert freelancer who can market my Work Hour Monitor System for me in South Africa. This system's primary function is to handle project management, with specific features that include: - Task Assignment & Tracking: Assign and keep a screen of tasks automatically. - Time Tracking & Logging: Capture precise work hours, and automate attendance track. - Project Tracking: Monitor multiple projects' progress simultaneously. - Pay Hourly Basis: Computes payroll based on tracked work hours. - Automated Time Tracker: Logs time spent on each task and project. - Application Tracking: Monitors usage of tools and applications for each project. - Offline Tracking: Log task hours when offline, and sync when back online. - URL Tracking:
Please analyze the current APK source code and explain about the overall architecture and how it works
Looking for a Virtual Assistant who is fluent in English and has some basic system administration skills. An ideal candidate would understand the following or has experience with: - Understands how to use VPNs, SOCKS proxies, and virtual machines on a PC. - How to send at least 500 emails daily via webmail, SMTP and a desktop mail software. - How to edit basic HTML or WordPress text content. - Significant experience working with various software and CRM systems. Please only apply if you meet all of the qualifications listed above. The budget mentioned is for one month of work of at least 5 hours per day.
I am seeking a DevOps and Java expert who can assist in streamlining my operation using cloud backend. - You will implement Infrastructure as Code (IaC) and Continuous Integration/Continuous Deployment (CI/CD) practices. - AWS, Microsoft Azure, and Google Cloud Platform (GCP) will be the preferred cloud platforms. Familiarity with these platforms is crucial for success. - This project's main goal is to optimize our operations. Hence, a track record of successfully streamlining operations is highly desirable. - Experience in cloud backends and Java is a must. In short, I will need someone with robust experience in DevOps, Java, and multiple cloud platforms for this project. An expert in optimizing operations through infrastructural enhancements would be an idea...
I'm looking for an experienced IoT developer who can create an Arduino-based system that triggers actions or alerts based on scraped text data from a website. Key Responsibilities: - Develop a system using Arduino, Raspberry Pi, and ESP32 microcontroller - Implement website scraping functionality to extract specific text content - Design a mechanism to trigger predefined actions or alerts based on the scraped data Ideal Experience: - Proficient in Arduino programming - Familiarity with ESP32 microcontroller and Raspberry Pi - Experience with website scraping techniques - Ability to integrate scraped data to trigger actions or alerts on an IoT system Please note that my preferred programming language wasn't specified. Feel free to suggest the most appropri...
...simulation with animated cars and an entrance control, all done in Java. The project has a tight deadline and I need it completed as soon as possible. Key Requirements: - Development of a simple, yet realistic highway traffic simulation - Implementation of entrance control system - Animation of cars in Java Ideal Skills and Experience: - Proficient in Java programming - Experience with real-time simulation development - Strong understanding of traffic management systems - Ability to create engaging and interactive animations - Committed to meeting tight deadlines The project is straightforward in terms of concept, but requires a high level of technical skill to execute effectively. If you have a strong background in Java and animation, and are co...
...purchasing codes Adding video veterinary consultations Link with added value Adding new offers for customers 8 sections (birds - bird supplies - cats and pets - cat and pet supplies - customer offers - video veterinary consultations - bird hotel - pet delivery) Modern and new design, good arrangement, speed of application and ease of browsing Required technologies Java OS Android ios Application techniques Swift java Required to be received Interface designs, programming codes, full application programming from design to launch - Developer with iOS Experience: The freelancer should have ample experience in iOS application development. Expertise in Objective-C or Swift would be a plus. - Live Chat Functionality: The application should include a real-time chat f...
...software must store and display detailed patient information effectively. Your understanding of data handling and structuring will be important for this feature. - **Medical History Tracking**: The software must provide an efficient way to maintain and access a patient’s past medical records. Experience in designing such systems is desired. - **Lab Test Results Tracking and Clinical Notes**: The system needs to integrate functionality for tracking lab test results and clinical notes within each patient profile. For example, monitoring the changes in Lithium levels in the blood over the course of the treatment. Your skills to incorporate complex features into a simple design will be crucial. - **User Interface**: The user interface should be straightforward and intuitiv...
I'm in need of a professional who can help me build a sophisticated and efficient fashion clothing website with some specific requirements. Key Services Needed: - The website should provide comprehensive accounting services including Sales, Purchase, Document Management, Taxation, and Inventory. - The accounting services should be robust and user-friendly. Design Preferences: - The website should have an elegant and classic design. Technology and Frameworks: - For the frontend, I'm looking to have the website built with React.js and Angular. - As for the backend, I prefer to use Node.js. Ideal candidate should have experience with: - Building robust and user-friendly ecommerce websites. - Implementing various accounting systems within websites. - Profici...
I'm in need of an experienced AWS Java Specialist who can provide ongoing support for my project. My work involves the use of Lambda functions, DynamoDB integration, S3 bucket management, and CDK Implementation. The ideal candidate has a wealth of experience in these areas and can confidently assist me in navigating through the technical aspects of this project. Key Responsibilities: - AWS Lambda functions creation and management - Integration of DynamoDB - S3 bucket handling - Implementing and assisting with CDK Skills & Experience: - Proficient in AWS Java technologies - Past successful experience in the roles above - Understanding of Amazon Builds - a unique aspect of this task - Good communication skills and a team player mindset Please detail your past exp...
I am currently developing an auction website and need some assistance in ironing out one of its major features. The website has two types of users: the admin (who also serves as the seller) and the users (who are the bidders). I require a system that allows the admin to add images to each auction item, that will be visible to all users. Specific Requirements Include: - Admin must be able to upload images of up to 5MB each. - For each auction item, the admin must be able to post a maximum of three images. Ideal candidates for this task will have strong experience in image management systems, and they will preferably have already worked on auction or e-commerce websites. Strong skills in Javascript, PHP or similar programming languages are also required. The ability to work effic...
I need an experienced freelancer capable of creating and implementing a mobile push notification system, particularly for both iOS and Android. I have a Health Care cross platform mobile app ready to launch and I need Notifications done by using cross platform system like Cordova and/or Angular. Key Responsibilities: • Handle the execution of informative alerts, real-time updates, status updates, and reminders. • The system should be designed to send notifications upon the completion of services and at defined specific times or events. Ideal Skills and Experience: • Demonstrable experience building notification systems for both iOS and Android. • Complete understanding of programming rules and regulations for each specific platform. • An inno...
I am seeking an Android app developer experienced in creating calendar apps. My ideal freelancer will be able to: - Implement reminder notifications. This is a key feature of the app that will need to be...freelancer will be able to: - Implement reminder notifications. This is a key feature of the app that will need to be developed with an option for the user to customize the time of notification. - Ensure synchronization with Android's native calendar app is seamless with the reminder notifications. - Develop an effective Task Management system within the app. - Provide a weekly view option for users to navigate their schedule. Desirable skills: Android Development, Java, UI Design, and Database Management. Previous experience creating or working with calendar apps ...
...our existing font generation system developed in C#. Currently, our system supports multiple languages but lacks comprehensive support for Arabic. ### Requirements: 1. Strong proficiency in C# and .NET Framework. 2. Experience with processing and analyzing texts in various Unicode encodings. 3. Ability to effectively implement and integrate UTF-8 encoding into the existing system. 4. Previous experience with font systems, particularly in Windows environments. 5. Ability to use diagnostics and debugging tools to identify and resolve issues. ### Objectives: - **System Update**: Enable the system to generate fonts that support Arabic script. - **Bug Fixes**: Address any encoding and display issues with Arabic characters. - **Thorough Testing**: Ensure t...
I'm looking for an experienced software developer to build a small online scanner to probe specific PC information and then verify its presence. The details include: - Operating System details. The exact aspects of the operating system that need to be verified are: - Identifying System Files. - Checking for Registry Entries. - Confirming the Presence of Installed Programs. You will need to check via an online scanner, the user must never download anything. There will be many sections on this project.
My old Android slot machine app is proving incompatible with the latest ve...version of Android Studio. Despite having imported the necessary Android package in the project, I'm unable to build the app. I keep encountering an error message stating "java: package does not exist". Here's what I need: - Identify the source of the build failure - Fix the "java: package does not exist", making sure the app builds successfully - Verification that the app is working perfectly in the current Android Studio version The ideal freelancer for this job would have extensive experience with Android Studio, and debugging skills for identifying and solving build problems. Knowledge with Java and past experience in fixing similar errors will be an a...
We are seeking a talented and experienced Java/Kotlin Developer to join our development team. The ideal candidate should be proficient in software development principles and practices. In this role, you will work on a variety of projects, from developing new features to maintaining and enhancing existing applications and creating Unit Tests. Key Requirements: - The application must be compatible with Android and iOS - I'm aiming for a high level of testing coverage, specifically continuous integration tests that run with every code update. Please bid with relevant examples of your work and an outline of how you would approach the testing of a Kotlin-based Android app.
Analista Programador Senior Certificado en Genexus con experiencia comprobable mínima de 3 años Manejo de Genexus versiones Evo2 y 17 Manejo de complemento Work with plus Programación de aplicaciones JAVA y C# Desarrollo Web Services Bases de Datos relacionales
