🙋🏻 Hi! I'm Sergio Suárez — a backend-focused full stack developer passionate about scalable, cloud-native backends.
💻 I work mainly with Node.js + TypeScript microservices, DDD & hexagonal architectures, MongoDB/PostgreSQL, and message queues (Kafka, Redis, RabbitMQ). On the frontend, I deliver robust SPAs with Angular when the product needs it.

💼 Currently working as Full Stack Developer @ Santander Universidades (Banco Santander) with Kairós Digital Solutions.
📦 I love API design, automation, testing, documentation and distributed systems.
🧪 In my spare time, I explore backend performance and tooling using Go (GoLang) in personal projects.
🎧 I studied Sound Engineering before Computer Engineering, so I also have a strong background in audio tech and sound design.

📍 Born in Santiago de Compostela · Based in Valladolid · Spain

Languages & runtimes

Frameworks & API tech

Architectures & patterns

• Clean architecture & hexagonal architecture
• Domain-Driven Design (DDD)
• Microservices & distributed systems
• RESTful APIs, gRPC & GraphQL
• Event-driven systems & pub/sub
• JSON Schema, validation & contracts

Databases & search

Caching, queues & streaming

• Unit & integration tests with Jest / Vitest (Node.js, TypeScript)
• Component tests with Testing Library (React / Angular)
• e2e testing with Cypress & Playwright
• Contract testing & API-first workflows (OpenAPI/Swagger)

• CI/CD, microservices deployment, observability basics
• SysAdmin background (Windows Server, Linux, networking)

• IDEs & editors: Visual Studio Code, Xcode, Android Studio
• API tools: Postman, Insomnia, Altair GraphQL
• VCS & project tools: Git, Git Fork, Sourcetree, Bitbucket, GitLab, JIRA
• Scripting: bash for automation and tooling

Technologies I use most in production projects:

• Santander Universidades (Banco Santander) – Kairós DS
  Node.js, TypeScript, Angular, microservices, gRPC, Elasticsearch, MongoDB, Redis, Kafka, Kubernetes, Helm, Swagger/OpenAPI, WebSockets, AWS.

• PagoNxt (Banco Santander) – Kairós DS
  Backend Tech Lead & Backend Developer building DDD microservices with Node.js, Express, TypeScript, Jest, Swagger, PostgreSQL, AWS, JSON Schema, Kubernetes.

• Wattwin
  Backend Components Tech Lead with Node.js, TypeScript, NestJS, Express, microservices & shared libraries, MongoDB, Elasticsearch, Docker, AWS, OpenAPI, event-driven comms (Deepstream).

• Syntonize / MAHLE / CIS21 & others
  Full stack roles using Angular, Ionic, React, Node.js, GraphQL, PostgreSQL, MongoDB, RabbitMQ, Docker, AWS/Azure, mobile & hybrid apps, plus earlier sysadmin & .NET background.

Actively completing a modern front-end & tooling bootcamp focused on:

• Advanced Layout & UX: responsive design, CSS Grid/Flexbox, animations, design patterns, accessibility, Figma → CSS.
• Modern JavaScript / TypeScript: core & advanced language features, best practices and architecture for frontend apps.
• Styling & frameworks: Tailwind, CSS-in-JS, design systems.
• Bundling & libraries: Webpack, Vite (apps & libraries), Rollup, Turborepo, monorepo patterns.
• Frameworks & meta-frameworks: React, Angular, Vue, Svelte, Solid, Web Components, Lit, Astro, Next.js, TanStack Start, Nuxt, Micro-frontends.
• Testing: unit & integration tests with Jest/Vitest + Testing Library (React/Angular) and e2e with Cypress & Playwright.
• APIs & cloud: REST APIs, WebSockets, GraphQL, payment integrations, Docker, basic cloud deploys.
• Mobility: PWA and React Native.

• Backend is my main strength: APIs, microservices, RESTful, GraphQL, and more.
• Strong Node.js + TypeScript experience across fintech, banking, energy and web platforms.
• SysAdmin roots: networking, servers, Windows + Linux environments.
• Solid audio engineering background → I enjoy performance, signal-flow thinking and audio-related projects.
• Team player, tech lead, tech mentor & problem solver.