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Javier Ramos Humeres

Software Engineer | Full-Stack & AI-Augmented Development

Full-stack software engineer with 4+ years building production systems end to end, from requirements and architecture to backend services, frontend, and cloud. Physics graduate who pairs strong fundamentals with an AI-augmented workflow: ships production code daily with AI coding agents and builds custom agent tooling (Claude Code skills, MCP servers, automated issue-to-PR pipelines) adopted by the team. Core stack: Node.js / NestJS, TypeScript, React / Next.js, SQL, and AWS.

Professional experience

Software Engineer · TeselaGen

08/2025 – Present

Santiago, Chile (Hybrid)

  • Led a full legacy-API migration to a modern NestJS clean-architecture (v2) backend in TypeScript, modernizing the services that power TeselaGen's consumer-facing biotech tools.
  • Build backend services and React / Next.js frontend features across multiple consumer tools, including the data and integration layers that serve the AI copilot.
  • Built an agentic-development toolchain: custom Claude Code skills, MCP tools and servers, and automated ticket-to-PR workflows that speed up delivery across the team.
  • Own authentication, security, and infrastructure concerns across the v2 services.

Backend Developer · Pinflag

05/2022 – 08/2025

Santiago, Chile

  • Built end-to-end payment integrations (Klap, Transbank): checkout flows, confirmation webhooks, reconciliation, refunds, and failure recovery.
  • Developed order-management and fulfillment automation across the full order lifecycle for e-commerce clients.
  • Designed and built a large-dataset analytics backend and its Chart.js dashboard frontend, with reporting and Excel / CSV data exports.
  • Shipped customer-notification integrations (WhatsApp API) on Node.js / Express and AWS (S3, SES, SNS, Lambda).

Projects

Isometric City-Builder (Unity, C#) · Personal Project

An end-to-end testbed for agentic development. Built a project-scoped MCP server, multi-agent and PRD-driven workflows, and a library of custom Claude Code skills and subagents that drive automated implement-and-verify loops from written specs.

Education

  • Diploma in Software Engineering

    Universidad de Chile · Santiago, Chile

    04/2025 – 08/2025

  • B.Sc Physics

    Pontificia Universidad Católica de Chile · Santiago, Chile

    2005 – 2010

  • Full Stack Web Development

    4Geeks Academy · Santiago, Chile

    2021 – 2022

Publications

Sound Synthesis of a Gaussian Quantum Particle in an Infinite Square Well.

2014

Computer Music Journal (MIT Press)

Peer-reviewed; physics-based sound synthesis.

MIT PressPDF

Skills

Languages
JavaScriptTypeScriptPythonC#SQL
Backend
Node.jsNestJSExpressREST APIsAuthentication & encryptionServerless (AWS Lambda)SequelizeTypeORM
Databases
PostgreSQLMongoDB
Frontend
React (Hooks)Next.jsTailwind CSSChart.js
Testing
Jest
Cloud & DevOps
AWS (S3, SES, SNS, CloudWatch, Lambda)GCPGitHub ActionsHerokuServerless FrameworkCI/CD (GitHub / Heroku / AWS)
AI & Agentic Dev
Claude Code (desktop & CLI)MCP tool and server authoringAgent skill & workflow designCursorGitHub Copilot
Specialized
Payment gateways (Klap, Transbank)E-commerce (Shopify, WooCommerce)Order managementWhatsApp API

Languages

  • Spanish · Native
  • English · Fluent
  • Portuguese · Conversational