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DEV BY SERGIO

Backend Software Engineer · Applied AI

I build backend products, developer tools and AI solutions for real-world problems.

I’m a software developer who feels most at home in the backend. I’ve worked on internal platforms, REST APIs, microservices, integrations and automation, often taking products from the first requirements through to delivery and maintenance.

I also enjoy building the parts people see, especially when a clear interface can make a complex process much easier for a non-technical team.

across product development, software quality and applied AI R&D
3 roles
taking internal products from requirements and architecture to deployment and maintenance
End-to-end
building REST APIs, integrations, automation and data-driven tools
Backend-first

Experience

I’ve learned to build software from different angles.

Working in QA, product development and R&D has taught me how software is tested, shipped, maintained and improved—not just how it is written.

  1. Sep 2025 — Jan 2026

    Indra

    Software QA Tester

    • Validated enterprise software through functional, integration and API testing with Jira, Postman, Selenium and Jenkins.
    • Investigated and documented incidents, reproduced failures and verified fixes.

  2. Jan 2024 — Sep 2025

    Adelsys

    Software Developer

    • Owned the full lifecycle of internal solutions: requirements, architecture decisions, development, deployment, support and maintenance.
    • Built full-stack applications, REST APIs, automation tools and an AI-assisted visual recognition and quality-control system.

  3. Mar 2023 — Nov 2023

    Grupo Recreativos Franco

    Software Developer, R&D

    • Explored generative AI applications for regulated gaming machines within a small R&D team.
    • Built real-time person–machine interaction prototypes with LLMs and evaluated technical, hardware and regulatory viability.
Before moving into software, I worked in industrial environments. That experience gave me a practical approach to diagnostics, precision, organisation and responsibility that I still bring to my work today.

Technical focus

The tools I use to turn ideas into working products.

Backend is my starting point, but I’m comfortable moving across data, AI, interfaces and delivery when the product needs it.

Languages I work with

  • TypeScript
  • Java
  • SQL
  • JavaScript
  • Python
  • C#
Backend & data I build services, APIs and relational data models that are straightforward to understand and maintain. View technologies Hide
  • Node.js
  • NestJS
  • Express
  • Spring Boot
  • Flask
  • REST APIs
  • PostgreSQL
  • MySQL
Architecture & applied AI I choose architectures that fit the problem and use AI when it adds something useful to the product. View technologies Hide
  • Clean architecture
  • Hexagonal architecture
  • Microservices
  • Integrations
  • LLMs
  • AI agents & skills
  • Computer vision
  • Feasibility analysis
Frontend & interfaces I create clear interfaces for complex workflows, so users can focus on their work instead of the system behind it. View technologies Hide
  • React
  • Vue
  • Astro
  • Tailwind CSS
Quality & delivery I rely on testing, automation and delivery tooling to make changes safer and easier to operate. View technologies Hide
  • Docker
  • Linux
  • Git/GitHub
  • CI/CD
  • Jenkins
  • SonarQube
  • JUnit
  • Selenium
  • Postman

Open source

VS Code tools for everyday development work.

My extensions are local-first by design: project knowledge stays in the workspace and useful tools remain close to the code.

combined downloads across my VS Code extensions
1,000+
extensions published in the portfolio
6

Pinake

A local-first Markdown documentation manager with search, templates, validation, import/export and Git integration.

JustAPI

A local-first HTTP client with collections, scoped variables, authentication, response history and cURL import—without login, telemetry or cloud storage.

Lynvo

A local-first Kanban board integrated with Git and AI agents, linking workspace tasks to code, history and metrics without a central server.

Explore all six extensions

Foundation

Education & languages

Higher Technician in Web Application Development

CEU FP Madrid

2024 — 2026

average grade
9.9/10

Honours in five modules. My final project focused on this portfolio and VS Code extensions for documentation, APIs, Git and AI-assisted workflows.

Higher Technician in 3D Animation, Games and Interactive Environments

UDIT

2021 — 2023

Technical training in game and interactive-environment development, including C# and Unity.

What I’m looking for

A team where I can contribute, keep learning and take on more responsibility.

I’d like to work with people who care about building things well, make space for thoughtful technical decisions and keep improving together. I’m especially interested in meaningful products and international teams where I can continue growing towards senior responsibilities.

Find me online