Freelancer profile translated to English.
Back to original languageAbout José Antonio
I help companies and teams build fast, scalable, and maintainable web applications focused on solving real business problems. I work as a Full Stack developer, covering everything from API design and backend architecture to modern and functional frontend interfaces.
I specialize in projects with JavaScript/TypeScript, Node.js, Angular, and microservices-based architectures. I also integrate AI solutions when they add value, such as semantic search, process automation, or data analysis.
What sets me apart is that I don't just develop features: I think about the complete product. I look for simple, well-structured, and scalable solutions, avoiding unnecessary technical debt. I adapt quickly to the project context and prioritize clear communication to move forward frictionlessly.
I have worked on:
Development of complete SaaS platforms (frontend + backend)
API and scalable service design
Integrations with third parties and existing systems
Implementation of AI solutions applied to business
Performance optimization and code refactoring
If you need someone who understands both the technical side and the business impact, I can help you take your project from idea to production in a solid way.
Spanish
Native or bilingual
English
Conversational
Portuguese
Fluent
Remote only
Primarily works remotely
Experience
- DLSoftware EngineerEDUCATION AND E-LEARNINGJuly 2024 - Today (2 years and 1 month)Madrid, Spain- Designed and implemented the backend architecture for an onboarding platform, defining APIs, data models, and the service structure to support scalable user flows.- Developed AI-powered backend services, including a RAG-based semantic search layer and a text2SQL system to enable natural language queries on structured business data.- Defined architecture and developed backend services for a job marketplace application, managing business logic, data processing, and exposing APIs for frontend consumption with Express, Redis deployed in Docker containers on AWS.- Designed and maintained RESTful APIs, ensuring performance, security, and scalability in distributed systems.- Worked with cloud environments and containers, collaborating with DevOps to deploy and monitor backend services (CI/CD).- Developed a custom integration layer for Moodle, enabling interaction between legacy modules in RequireJS/AMD and modern components managed from the backend.
- Self-EmployedFull-stack DeveloperTECHMay 2018 - June 2024 (6 years and 1 month)Madrid, Spain- Developed and delivered multiple SaaS platforms in different domains, focusing on clean architectures (Hexagonal), scalability, and full end-to-end feature responsibility using NextJs, tRPC.- Built a SaaS platform for the LBM (Lumber & Building Materials) industry, using Angular on the frontend and microservices with TypeScript deployed on AWS Lambda, with RabbitMQ for asynchronous communication and event-driven flows.- Contributed to a real-time online gaming platform based on skills with an MLM business model, using Angular on the frontend and Python microservices for backend logic and transaction management.- Developed a property rental/booking SaaS platform using Vue.js and NestJS, implementing a modular backend architecture (Clean Architecture) and responsive user-centered interfaces.- Participated in the development of a blockchain/NFT platform, integrating frontend applications with smart contracts and decentralized services.- Designed and implemented component-based user interfaces using Vue.js, React, and Angular, integrating them with REST/GraphQL APIs and ensuring maintainable and scalable frontend architectures.- Worked in cloud-native environments (primarily AWS), integrating serverless and microservices-based backends, and collaborating in distributed agile teams.
- USP - Universidade de São PauloSoftware EngineerINTERNET OF THINGS (IOT)May 2017 - April 2018 (11 months)BrazilDesktop Application Development with Qt/QML/C++ for HUDs:- Participated in the development of desktop applications using Qt/QML/C++ to interact with Head-Up Displays (HUDs).- Designed and implemented intuitive user interfaces for HUD applications, ensuring smooth interaction and an optimal user experience.- Collaborated closely with team members to integrate functionalities into existing software systems.Python Script Development for HUD Experimentation (Vuzix, Epson Moverio, Pupil Labs):- Developed Python scripts to facilitate experimentation and data collection with various HUD devices, including Vuzix, Epson Moverio, and Pupil Labs eye trackers.- Automated experimental procedures and data analysis tasks, streamlining the research process and increasing efficiency.- Performed script testing and validation to ensure accuracy and reliability in diverse experimental settings.Tobii Eye Tracker Keyboard Design:- Implemented a custom keyboard layout optimized for use with Tobii Eye Tracker devices.- Conducted usability testing and gathered user feedback to iterate and refine the keyboard design, improving functionality and user satisfaction.
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Education
- Postgrade CoursesUSP - Universidade de São Paulo2016Postgrade Courses
- Master's Degree in AppliedUniversity of Camaguey2012Master's Degree in Applied