Hi, I'm Alejo Marinsalda
Backend Developer | AI Engineer
Backend Developer experienced in building scalable systems, designing API-driven architectures, and implementing robust business logic within enterprise environments. I focus on translating complex operational needs into maintainable, high-performance backend solutions that prioritize data integrity, efficiency, and long-term scalability.
Backend Engineer | AI Engineer
Backend engineer with a focus on AI systems — agentic pipelines, retrieval-augmented generation, and the cloud infrastructure that supports them. I work at the intersection of software engineering and applied AI, building the backend layer that turns language model capabilities into reliable, production-ready products.
I take ownership of the full backend picture, from system design to deployment. I'm driven by building things that are correct, observable, and built to scale under real-world conditions.
Outside of engineering, I'm genuinely interested in the science of energy and performance — sleep, nutrition, training, focus. Not as a productivity hack, but because I find it fascinating how everything compounds: better sleep sharpens thinking, consistent training builds discipline, and that discipline shows up in the work.
I approach self-improvement the same way I approach systems — iteratively, with curiosity, and with an eye on what actually moves the needle.
Tech stack
Backend
- Python
- FastAPI
- Node.js
- PostgreSQL
- Pandas
Frontend
- React
- TypeScript
- Tailwind CSS
- Vite
AI / LLM
- LangChain
- LangGraph
- OpenAI API
- Anthropic Claude
- Google AI
- RAG Pipelines
- Vector DBs
- Prompt Engineering
- Fine-tuning
- LangSmith
Infrastructure
- AWS
- Docker
- Kubernetes
- CI/CD
- GitHub Actions
Tools
- Git
- System Design
- Agile / Scrum
- Code Review
- Technical Docs
Live apps
All projects →NomadAI
A chatbot that helps you choose your next ideal destination as a digital nomad, taking into account your hobbies, monthly budget, goals, visa requirements based on your nationality, and more.