Freelancer profile translated to English.
Back to original languageAbout Nacho
Software engineer with over 4 years of experience developing production-ready products: scalable backends, Node.js and Fastify APIs, modern Next.js frontends, and conversational AI and data analysis pipelines with LangChain and LangGraph.
I have worked for a California startup (ComplexChaos), a platform with millions of monthly users (The Bump, The Knot Worldwide), and industrial companies like ABB Robotics.
My focus is pragmatic engineering: well-typed APIs with OpenAPI and Zod, hexagonal architectures, continuous deployments on AWS, and code that another team can maintain without surprises.
In recent months, I have specialized in integrating LLMs into real products: systems that call OpenAI, Anthropic, or Gemini with structured outputs, agents with state graphs in LangGraph, and conversational processing pipelines.
I am also a power user of Claude Code (skills, agents, MCP) and build internal tools to accelerate development.
I work in Spanish and English, respond quickly, and deliver what I say I will deliver. If your project involves backend, LLM integration, multi-tenant platforms, or you need someone who can take a feature from zero to production, send me a message!
Spanish
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- ComplexChaosFull-Stack EngineerJanuary 2026 - Today (7 months)
- Development of a conversational AI platform for a California startup.
- Built from scratch a pipeline with LangChain and LangGraph that went from zero to production in less than 2 weeks, including state graphs, Postgres checkpointers, and structured outputs.
- Designed all APIs under OpenAPI specification with Zod and Orval, generating typed clients for frontend use.
- Developed the app's authentication service in Fastify with Better Auth, integrating JWT, OAuth, and access control plugins over PostgreSQL.
- Integrated Retell AI for voice sessions.
- Deployed the infrastructure on AWS, managing it with SST.
- The Knot Worldwide — The BumpFull-Stack EngineerPUBLIC SECTORNovember 2023 - January 2026 (2 years and 2 months)
- Full-stack development at The Bump, a platform for parents with millions of monthly active users. Designed and implemented a large-scale data transformation pipeline that enabled the launch of an e-commerce MVP.
- Worked in-depth with Payload CMS, custom collections, hooks, access control, and contributed fixes to the open-source project.
- Maintained services with Docker and Kubernetes on AWS infrastructure, working with queues and event-driven patterns for asynchronous processing.
- Field of activity: Media & Content / E-commerce - Alten — embedded at ABB Robotics (Optifact Suite)Full-Stack EngineerINTERNET OF THINGS (IOT)October 2022 - November 2023 (1 year and 1 month)Spain
- Developing ABB Optifact, an industrial automation suite used in automotive factories.
- Helped develop modules like ABB Insights and ABB Edge Config Tool with Node.js, React, TypeScript, and GraphQL.
- Automated DevOps workflows with Docker and GitHub Actions on deployment pipelines in Azure IoT Edge.
- Contributed to an internal fork of Grafana for ABB Insights
- 5 skills: TypeScript, Node.js, React, GraphQL, Docker- Field of activity: Industry & Manufacturing / IoT
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Education
- Software Engineering Technical Diploma in Computer Networking & Systems AdministrationFormación Profesional de Grado Superior (DAW)Software Engineering Technical Diploma in Computer Networking & Systems Administration