Hire the best API Developers in Barcelona, ES

Check out API Developers in Barcelona, ES with the skills you need for your next job.
  • $100 hourly
    Hi, my name is Alexander. I'm a software engineer with over 15 years of experience, specializing in web development. My expertise lies in creating CRM Systems, Integrated Business Solutions, Web Services, E-Commerce Websites, Embedded Applications, and Social Networks. Recently, I've been leading technical aspects of international projects. My technical skillset includes: - Programming Languages: JavaScript, TypeScript, NodeJS, PHP, Golang - Frameworks: JavaScript (Nest, Express, Koa) and PHP (Symfony, Yii2) - Frontend technologies: React, Redux, RTK - Databases: MySQL, PostgreSQL, MongoDB, Cloud-based solutions - Backend Services: Websockets, MicroServices, Message Queues, RESTful APIs, etc. - CI/CD Tools: GitHub, Bitbucket, Jenkins - Cloud Services: AWS, Digital Ocean As a tech leader, I am skilled in translating business requirements into technical solutions and organizing development processes. I'm good at building teams and guiding projects from start to finish. My involvement in projects has consistently led to successful outcomes for my clients. Please feel free to reach out with any questions or project inquiries!
    vsuc_fltilesrefresh_TrophyIcon API Development
    MySQL Programming
    PostgreSQL Programming
    Yii2
    JavaScript
    Node.js
    React
    PHP
    SaaS
    MongoDB
  • $20 hourly
    Enthusiastic and Passionate Freelancer on UpWork, Specializing in Python Development, Web Automation, BOTS, Web Scraping, and Data Analysis. Extensive experience in Python. Firm grip in Data Extraction, Transformation and Loading(ETL) from different numerous data sources. Sound knowledge of Software Development, Web Automation, Data Analysis, AWS EC2, and BOTS. Projects I have done Recently in Python: 1) UK VISA Appointment Update System, in which the BOT keeps checking the website 24/7 running on AWS EC2 and update the client using TELEGRAM whenever there are appointments available. 2) Portugal ID and Passport Update System, same as the UK Appointment, it updates the client using TELEGRAM and also running 24/7 on AWS EC2. 3) Python Conference Scheduler, It schedules any meetings/conference which of 3 or 4 days. You have to provide timing, name of speaker and name of conference else the program will do. 4) Different Python Security Algorithms 5) Python Data Scraping from different websites, including some of the top e-commerce websites. I am eager to work with you to provide reliable, consistent, High-level solutions to development problems. Feel free to contact me to discuss the workflow of your business needs.
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    Machine Learning
    HTML
    Data Analysis
    Data Science
    Subtitles
    Deep Learning
    Data Visualization
    Python Script
    Flask
    Automation
    JavaScript
    Web Crawling
    Python
    Beautiful Soup
    Data Scraping
    Selenium
  • $80 hourly
    I have 25+ years experience in programming, 20 years with Javascript and 10 years with the MERN stack and mobile native development too. I grew up in Paris, for my degree, I moved to San Francisco in the mid 90s and started learning web oriented progamming language such as PHP / Javascript but also VRML. I developed mainy basic website or brochure for local companies in California then I moved on to more sophisticated digital services in the early 2000s and then starting 2008 I added mobile programming to my expertise. I ended up knowing the full spectrum of modern digital production, ranging from mastering multiple programming languages on different plateforms or devices, server administration, API development and network managment. In my career, I’ve programmed as an employee, as a freelancer but also as a founder of multiple companies in France, USA or China. I’ve developed many projects by myself or worked as a progamming team leader within teams of chinese or french developers. Over all these years, I’ve also developed my own personal projects. Ranging from an online visual CMS, an online publishing service, an online file management service. I’m tayloring since 2019 Brainers, a React native Dapp linked to an ethereum smart contract. I also R&D the blockchain technology, the AR technology, due to the coming boom of the smart glasses, and also the AI technology with Tesseract and Tensorflow. I’m always eager to learn more competences. Regarding functionalities, I’ve done many MERN projects, APIs, User management, signin, regristration, account profile, emailing scripts. I’ve done data handling as well, metrics and optimization. Navigation and User experience too. I’ve worked with 2D or 3D assets, using Webgl and libraries like threejs, imagemagick or FOP for example. I also do lots of file processing, conversion, automatization and syncronization between servers or online services such as AWS. In the last years I’ve focused on NFT and blockchain technology with ERC720/1135 tokens.
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    ExpressJS
    RESTful API
    Cucumber
    Database
    API
    Back-End Development
    Vue.js
    Front-End Development
    Python
    Amazon Web Services
    MongoDB
    React
    MySQL
    Node.js
  • $77 hourly
    Rust - since 2015, Angular, Ionic - since 2011, Web dev - since 2004. I have experience with: Rust, TypeScript, JavaScript; Angular, Iron, Ionic; RxJS, NgRx, Jest, Twitter Bootstrap, Angular Material... Databases: MySQL, Redis, PostgreSQL, Cassandra, MongoDB, CouchDB. I prefer to solve mathematically-challenging tasks (love to apply math to solve real-world issues). I follow best practices and my years of experience to design apps architecture clean, scalable, and easy for collaboration & code reuse. Have experience in writing CRM, ERP, and WMS for big e-commerce and small startups. In Angular, I can write directives (components) of any level of complexity - including interactive maps (Angular+D3.js), nested trees, SVG elements, and other fancy things. I can build a modern and solid foundation for your Angular project using Nx and NgRx, applying a collection of the industry’s leading solutions for the folders/components structure and organization. I can improve the performance of your app as much as possible, by using the OnPush strategy, tuning ZoneJS flags, using requestAnimationFrame, reducing reflows, and moving some modifications out of NgZone, and many other improvements. I can build best-practices-driven services and libraries, using RxJS, declarative event-driven programming, and Reduce patterns. I have experience with Ionic, I've created multiple mobile apps with this framework, including sophisticated WMS (Warehouse Management System), consisting of mobile apps (scanning, instructions, price stickers printing, items movement, delivery scheduling). I'm enjoying Rust programming since 2015. Most of my experience in Rust is related to webdev - REST API, DB connections, data analysis, and tasks background execution. Have a lot of experience with caching (also with mutexes, semaphores, preventing dog-pile and race condition effects, and RAII control of resources). One of my achievements is 100% Rust REST API, serving multiple Web and mobile apps (CRM, Task Manager, mobile apps, websites). As a contractor, I've been working with Vodafone (devices control system), NTT & Sony (Spartacus CRM custom payment system as a library). My favorite books are Clean code, and Patterns of Enterprise Application Architecture. I like and respect SOLID principles.
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    Material Design
    RxJS
    Software Consultation
    Front-End Development
    Rust
    RESTful API
    Code Review
    Figma
    Redis
    TypeScript
    Angular
    MySQL
    Ionic Framework
  • $50 hourly
    Software engineer with almost twenty years of experience, with great analytical skills to develop highly effective solutions to business and technology challenges. Highly organized with strong capacity to prioritize workload, delegate deliverables, and steer project completion within established deadlines. Fluent in English, Spanish and Italian.
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    Agile Software Development
    MySQL Programming
    Agile Project Management
    Code Review
    GitHub
    Symfony
    PHP
    API
    Laravel
    SQL
  • $40 hourly
    I am a hardware/ software developer with experience working with microcontrollers and hardware architectures for machine learning workloads. Moreover, I have experience developing electronics circuits from the design , pcb and layout to the firmware implementation and testing. Also, my background includes developing web apps using NodeJS and VueJs.
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    C
    Vue.js
    Firmware Programming
    Computer Engineering
    ARM Cortex-M
    Digital Electronics
    Microcontroller
    Machine Learning
    Algorithms
    Node.js
    C++
  • $90 hourly
    I am an expert on Azure services. Have worked with the core building blocks for more than 10 years and have worked with Data and Container services like AKS. - Full Architecture Design - Cost Optimization - Migration from OnPrem - Teaching staff to adapt to cloud
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    Azure Machine Learning
    Microsoft Azure Administration
    Azure DevOps
    Software-Defined Storage
    REST API
    Relational Database
    Microsoft SQL Server
    Azure Cosmos DB
    ASP.NET MVC
    ASP.NET Core
    C#
    Architecture
    Microsoft Azure
  • $50 hourly
    Summary More than 17 years of experience in delivering technology infrastructure and development initiatives in conjunction with cross-functional teams within a matrixed organization. Possess superior communication skills and a consultative mindset, with a key focus on driving innovation, ensuring successful project execution, and maintaining alignment with the organization's business objectives across multiple locations. Expertise Digital Transformation Budgeting and FinOps Management Multi-Site Team Leadership Change Enablement Merger and Acquisition Integration IT Processes Standardization Supplier Management Transition Planning and Support Marketing Automation Product Management Information Security Management Infrastructure Design
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    IT Infrastructure
    IT Asset Management
    Federal Information Security Management Act of 2002
    Change Management
    Digital Transformation
    Amazon S3
    Product Development
    Amazon EC2
    Ecommerce
    Cloud Computing
  • $35 hourly
    A lo largo de mi trayectoria, he dedicado mi enfoque al desarrollo de software, destacándome por garantizar estándares de calidad excepcionales. Considero que el testing de software no es simplemente un proceso, sino una cultura que va más allá de la evaluación de fallas, abarcando la constante búsqueda de mejoras y la aportación de perspectivas valiosas en grupos de desarrollo. He cultivado experiencia en entornos de metodologías ágiles, fortaleciendo mi capacidad para adaptarme a cambios rápidos y responder eficientemente a las dinámicas del proyecto. Actualmente, me desempeño como QA Automation Lead en AXA Seguros para Barcelona, España.
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    Quality Assurance
    Microsoft Publisher
    International Development
    System Automation
    API
    Web Application
    Automation
    QA Automation
    Product Development
  • $50 hourly
    ¿Deseas optimizar tus procesos, aumentar la eficiencia y reducir costes? Soy un apasionado del desarrollo web con más de 15 años de experiencia en análisis, diseño y desarrollo de aplicaciones web. Mi enfoque se centra en la mejora continua, la innovación y la entrega de soluciones efectivas que satisfacen las necesidades del negocio y de los usuarios. Me encanta trabajar en estrecha colaboración con mis clientes para comprender sus objetivos y crear soluciones personalizadas que les ayuden a alcanzarlos. Mis servicios incluyen: Desarrollo de aplicaciones web a medida: Diseño y desarrollo de aplicaciones web que se ajustan a las necesidades específicas de su negocio. Automatización de procesos web: Automatización de tareas repetitivas para liberar tiempo para tareas más estratégicas. Integración de APIs de terceros: Integración de APIs de terceros para ampliar la funcionalidad de su sitio web o aplicación web. Mantenimiento y soporte técnico: Mantenimiento y soporte técnico continuo para su sitio web o aplicación web. Estoy comprometido a proporcionar a mis clientes soluciones de alta calidad que satisfagan sus necesidades y expectativas. Me encantaría saber más sobre tu proyecto y cómo puedo ayudarte a alcanzar tus objetivos. No dudes en contactarme!!!!!.
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    API Documentation
    Clean Architecture
    Docker
    PHP
    Symfony
  • $50 hourly
    Web and mobile developer. Experienced in React.js and React- Native. Have experience in working with different size teams. Have experience in leading 3-5 people teams, other than that have 10+ years of experience and will be happy to help and contribute in you project.
    vsuc_fltilesrefresh_TrophyIcon API Development
    GraphQL
    Node.js
    Firebase
    Websockets
    NestJS
    TypeScript
    JavaScript
    Redux Thunk
    Redux Saga
    React
    React Native
  • $70 hourly
    I am a Software Engineer with 15 years of experience in analysis, design, development, and quality software. My expertise includes object oriented programming, design patterns, software engineering, agile methodologies, and software life cycle. I have worked as a developer, SDET, QA Automation, and technical lead.
    vsuc_fltilesrefresh_TrophyIcon API Development
    NUnit
    Unit Testing
    TestNG
    Software Design Pattern
    Selenium WebDriver
    Java
    C#
    Jenkins
    API Testing
    Docker
    Integration Testing
  • $13 hourly
    If you're in search of someone to tackle data analysis projects, develop cutting-edge AI solutions, or dive into the world of Big Data, I've got you covered. My skill set includes Python, SQL, API management and LLM integrations, making me well-equipped to handle a variety of data-related tasks. Whether it's crafting data-driven insights, creating AI-powered applications, or working on API developmento or integrations, I'm here to make your data-related dreams a reality. Let's chat and explore how we can work together to achieve your goals. Looking forward to connecting!
    vsuc_fltilesrefresh_TrophyIcon API Development
    App Development
    API Integration
    ChatGPT API Integration
    AI Agent Development
    Chatbot Development
    AI Content Creation
    Content Creation
    LLM Prompt
    pandas
    PandasAI
    SQL
    Python
    Data Analysis
    Business Intelligence
  • $30 hourly
    I'm a tech enthusiast with a passion for creativity, boasting extensive experience in both software engineering and graphic design. My career has been dedicated to crafting innovative and engaging solutions that blend the best of both worlds. In software engineering, I've worked with a diverse range of technologies, including Next.js, PostgreSQL, Prisma, GraphQL, Firebase, React, React Native, Tailwind, JavaScript, TypeScript, CSS, and HTML. My focus has primarily been on building robust and secure APIs to drive high-performance applications. I take pride in having built a social network from scratch, providing valuable experience in developing comprehensive and scalable projects. My love for graphic design has led me to collaborate with streetwear brands, where I excel in merging design and technology to create visually stunning user experiences.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Shopify
    Shopify Development
    Software Development
    Graphic Design
    International Development
    Product Development
    TypeScript
    JavaScript
    WordPress
    Next.js
  • $20 hourly
    With over two decades of leadership and entrepreneurial experience in various fields, I have a proven track record of creating and growing successful brands and companies in software development, design, fintech, and health. I am passionate about delivering value, quality, and innovation to my clients and partners through web-based software solutions. As the co-founder and CEO of Quarkino, I lead a team of talented and dedicated developers, designers, and engineers who share my vision of providing an affordable and time-saving way to develop customized software with standout features like strong security, data integrity, scalability, and stability. We specialize in a wide range of domains, such as AI, IoT, and fintech, and leverage our skills in creative problem solving, relationship building, and business strategy to meet the needs and expectations of our customers.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Software Development
    Product Development
  • $10 hourly
    I'm an experienced developer with over 3 years of expertise in building web applications, whether it's backend, frontend, or both. My toolkit includes Python, JavaScript, Django, Node.js, React, AWS, and Terraform. Additionally, I leverage no-code tools to develop fully functional websites with backend and database capabilities, enabling me to deliver projects 3x faster than traditional methods. Tools: WeWeb, Webflow, Wix, Xano, Supabase... This fusion of no-code expertise with my engineering background ensures the creation of scalable and efficient solutions in a record time. Furthermore, I collaborate with an experienced designer on my team who can create designs from scratch.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Supabase
    Wix
    Webflow
    WeWeb
    MongoDB
    PostgreSQL
    React
    NodeJS Framework
    JavaScript
    Django
    Python
    Software Development
    Web Application
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