# Oliver Mas (olidroide)

> Principal Engineer, AI Solutions Architect and Technical Lead with 16 years of experience. Generative AI in production, Python, FastAPI and AWS. 100% remote from Madrid.

Oliver Mas Otero (olidroide) is a Principal Engineer · AI Solutions Architect · Technical Lead based in Madrid, Spain, open to **100% remote** roles. Native Spanish, English. 16 years building critical software: from Android 1.5 in 2010 to generative AI platforms in regulated environments. Architecture, code and technical leadership, hands on the keyboard.

En español: Principal Engineer, AI Solutions Architect y Technical Lead con 16 años de experiencia. IA generativa en producción, Python, FastAPI y AWS. 100% remoto desde Madrid.

## Pages

- [Perfil en español](https://olidroide.es/): versión principal de la web.
- [Profile in English](https://olidroide.es/en/): same content in English.

## Contact

- LinkedIn: https://www.linkedin.com/in/olidroide/
- Email: hola@olidroide.es
- GitHub: https://github.com/olidroide

## Highlights

- **Generative AI in a regulated environment**: Architecture and development of a RAG and multi-agent platform for clinical-trial research in rare diseases, in the pharmaceutical sector.
- **AWS costs** (-70%): By optimising the architecture and cloud resource usage, with continuous operational review.
- **Payments and transactions**: Stripe, Google Pay, Apple Wallet and restaurant POS: flows where a failure costs money.
- **Industrial 5G**: Cloud orchestration to roll out 5G connectivity at industrial scale and automate the SIM lifecycle.

## Career

- **Stage 1 · 2010-2018, Android**: From an HTC Magic running Android 1.5 to apps built from scratch: eTaxi (one of the first taxi apps in Madrid), TuMe and Talky with Telefónica R&D, We2 Social WiFi, Weplan, and the Cheerfy app as sole developer and UX designer.
- **Stage 2 · 2018-2024, Backend, payments and cloud**: Lead Software Engineer at Cheerfy: payments, wallets, POS and Wi-Fi captive portals. Then at InnoIT: FastAPI microservices on Azure, industrial 5G on AWS and observability with OpenTelemetry and ELK.
- **Stage 3 · 2025-now, Generative AI**: Technical Lead and AI Solutions Architect: secure RAG, multi-agent workflows, structured LLM outputs and real-time experiences with FastAPI, HTMX and SSE on AWS Bedrock.

## Open source / side projects

- [FastAPI + HTMX + SSE](https://github.com/olidroide/fastapi-htmx-sse) (Python · HTMX): An example of the real-time stack I use in production: a FastAPI server, an HTMX UI and live updates over Server-Sent Events.
- [RAG chat (PoC)](https://github.com/olidroide/rag-chat-poc) (TypeScript · Next.js): Proof of concept of a chat frontend with Retrieval-Augmented Generation.
- [Doresare](https://github.com/olidroide/doresare) (Python · AI): AI app that detects the chords in a music video and overlays synced ukulele chord diagrams.
- [Top Video Generator](https://github.com/olidroide/top-video-generator) (Python · Terraform): Pipeline that tracks the fastest-growing music videos on YouTube (Bollywood), renders horizontal and vertical recaps and publishes them to YouTube, Instagram and TikTok.
- [¿A quién le importa lo que FastAPI haga?](https://github.com/olidroide/-A-quien-le-importa-lo-que-FastAPI-haga-) (Python · talk): Demo code from my talk about FastAPI (in Spanish).
- All repositories: https://github.com/olidroide?tab=repositories

## Skills

- **AI & LLM**: LangSmith, AWS Bedrock, LiteLLM, Pydantic AI, Agno, RAG, multi-agent workflows, OpenSearch Vector Search, structured LLM outputs, prompt engineering, LLM gateway and provider abstraction
- **Backend**: Python, FastAPI, Pydantic, SQLAlchemy 2.0, Alembic, Django, PostgreSQL, Redis, DynamoDB, REST APIs, Server-Sent Events, WebSockets, asynchronous processing, microservices, PHP
- **Frontend & mobile**: HTMX, Jinja2, Tailwind CSS, SSR, React, Redux, JavaScript, Node.js, Android
- **Cloud, DevOps & observability**: AWS (ECS Fargate, Lambda, S3, SQS, SNS, OpenSearch, CloudWatch), Azure, Docker, GitHub Actions, GitLab CI/CD, Testcontainers, OpenTelemetry, ELK, PostHog
- **Architecture & leadership**: Hexagonal architecture, Clean Architecture, design patterns, system design, ADRs, integration testing, RBAC, code reviews, Technical leadership, Mentoring, stakeholder management, agile delivery
- **Payments & integrations**: Stripe, Google Pay, Apple Wallet, restaurant POS, webhooks, transactional systems, captive portals, MikroTik, UniFi, network automation

## Education

- Master's degree in Free Software, Universidad Rey Juan Carlos (2010-2012)
- Systems Administration Engineering, Universidad Alfonso X el Sabio (2008-2010)