Node.js · TypeScript · NestJS · Python · FastAPI · Angular · React · AWS

Hi! I'm Sergio Suárez — a Senior Full Stack Developer / Tech Lead passionate about building scalable distributed systems and modern cross-platform applications.

Currently at Kairós DS working in the project: Full Stack Senior @ Santander Universidades (Banco Santander).

I specialize in the TypeScript ecosystem, architecting robust Node.js / NestJS microservices (DDD & Hexagonal) while delivering high-performance web and mobile experiences with Angular, React and Ionic. I bridge complex cloud-native backends (AWS, Kafka, Redis, RabbitMQ, MongoDB, PostgreSQL) and polished, reactive interfaces.

I also ship GenAI into real workflows: custom MCP tools, RAG (PostgreSQL + pgvector), Python / FastAPI services, LangChain apps and n8n orchestration — plus advanced Cursor usage (Skills + MCPs).

I love API design, automation, testing and resilient distributed systems.
Spare time: backend performance and low-level tooling with Go.
Sound Engineering before Computer Engineering — signal-flow thinking for systems & performance.

Born in Santiago de Compostela · Based in Valladolid, Spain

Check my portfolio: sergiosuarezgil.com

• Clean Architecture & Hexagonal
• Domain-Driven Design (DDD)
• Microservices & distributed systems
• REST, gRPC, GraphQL · event-driven / pub-sub
• JSON Schema, validation & API contracts
• CI/CD, containers and cloud-native delivery

Languages & frameworks

Data, cloud & delivery

APIs, messaging & architecture

GenAI & automation

• Santander Universidades (Banco Santander) · Kairós DS — Full Stack Senior (present)
  Angular monorepos + microservices (DDD / hexagonal), gRPC, Elasticsearch, MongoDB, Redis, Kafka, Kubernetes, Helm, AWS.
  Daily AI workflows (Cursor, Copilot, Windsurf, Devin) and custom MCPs for day-to-day engineering.

• Wattwin — Backend Components Tech Lead
  NestJS / TypeScript microservices & shared libraries, MongoDB, Elasticsearch, Docker, AWS.
  LangChain + Anthropic for conversational AI in production backends.

• PagoNxt (Banco Santander) · Kairós DS — Backend Developer → Backend Tech Lead
  DDD microservices with Node.js, Express, TypeScript, PostgreSQL, JSON Schema, Jest, Kubernetes, AWS.

• Daptalis — automation & GenAI ops
  Custom MCP tooling, Python / FastAPI, pgvector / RAG, n8n, Docker microservices + control center.

• Syntonize / MAHLE / others — full stack
  Angular, Ionic, React, Node.js, GraphQL, PostgreSQL/MongoDB, RabbitMQ, Docker, AWS/Azure · earlier sysadmin & .NET roots.

I treat AI as part of the engineering process — not just a chat box.

• Custom MCP servers & tools — business/dev capabilities for agents (Santander Universidades + Daptalis)
• Cursor-first workflows — advanced daily use of Cursor, custom Skills and MCPs for architecture, coding, reviews and ops
• RAG — embeddings, vector search, grounded answers with PostgreSQL + pgvector
• LLM apps in production — LangChain / Anthropic (Wattwin); n8n + LLM chains for operational automation
• AI-assisted code review — PR-Agent (Qodo) in GitHub Actions with structured prompts & guardrails
• Daily tools also include Copilot, Claude Code, Codex and similar agentic assistants

• Master's / advanced programs in AI for software development — agents, RAG, MCP, prompt & context engineering
• Continuous deep practice with Cursor (Skills + MCPs) and the broader agentic coding stack

• Backend is my main strength: APIs, microservices, REST / GraphQL / gRPC
• Strong Node.js + TypeScript across fintech, banking, energy and product platforms — plus growing Python / FastAPI
• Ops background: networking, servers, deploy & DevOps on macOS + Linux
• Tech lead / mentor · problem solver · team player