Lead Backend Engineer
5+ years building production systems.
Personal projects
Built after hours, usually because I wanted the tool to exist.
Claude Code Cubs
Desktop app for running many coding agents at once
A desktop app that runs several Claude Code agents side by side, each one isolated in its own git worktree and branch. The terminal is not a simulation of the CLI — it is the CLI, running in a pty, so every slash command, permission prompt, and MCP server behaves exactly as it does in a shell. Status is read from Claude Code's own hooks instead of scraped off the screen, so a window full of agents still shows which one is actually waiting on you.
Mayweather
Real-time prediction-markets data platform
Ingests Kalshi and Polymarket order books in real time. Async REST bulk-loaders plus persistent WebSocket streams feed an upsert-based sync into PostgreSQL time-series storage.
PadelRank
Real-time padel ranking & matchmaking app
A React Native + Expo mobile app for points-based ranking, matchmaking, and tournaments, with real-time updates and end-to-end-encrypted messaging over an offline queue.
From requirements and system design through implementation, testing, and production deployment.
01 / 05
Software Intern
Jun 2021 — May 2022 · Internship · Monterrey
Applied Agile methodologies in enterprise-level software development.
Developed test cases for Combine system software and performed SIL (Software-in-the-Loop) testing.
Automated report generation with Python, improving reporting efficiency.
02 / 05
Software Engineer
May 2022 — Jul 2023 · Full-time · Culiacán (Hybrid)
Full-stack engineer in an agile team building financial-services products from the ground up across a varied stack.
Built the platform's authentication gateway and refactored legacy code behind new, more secure adapters.
Independently built a financial-services chatbot on Hasura, PostgreSQL, and GraphQL, improving customer experience and support efficiency.
Contributed across React, Next.js, LoopBack, Express, MongoDB, and MySQL, and helped set up cloud infrastructure and delivery pipelines.
03 / 05
EA Software Intern
Jul 2022 — Dec 2022 · Internship · Monterrey
Built integrations across enterprise applications to improve enterprise-architecture visibility.
Programmed integrations across multiple applications with Node, Atlassian Forge, and LeanIX.
Helped map and document the company's application landscape and technological dependencies.
04 / 05
Software Engineer / DevOps
2025 — Present · Contract · Remote
Contract software engineering and DevOps: I designed, developed, and deployed products with AI integrations for client companies like Pied and Happymile.
Replaced slow manual Excel reconciliation in a cross-border (US/MX) logistics operation with custom software: a Python/FastAPI engine (pandas, MongoDB) that ingests billing and trip spreadsheets, auto-classifies freight routes, and computes extra-kilometer and toll costs, behind a React/TypeScript operator app on Cloud Run + Firebase.
Contributed to a multi-region (US/MX) Transportation Management System, on FastAPI + DynamoDB and React, deployed on AWS ECS Fargate + Amplify with Terraform and GitHub Actions.
Designed the requirements for an AI-assisted operations CRM (FastAPI + MongoDB, React 19) with OpenAI-powered task auto-classification, auto-assignment, and insights, and led a team of developers delivering it on GCP Cloud Run + Firebase.
05 / 05
Lead Backend Engineer
Jul 2023 — Present · Full-time · Mexico City (Hybrid)
Lead backend engineer at a consumer-lending fintech (personal loans, BNPL, and store credit). I lead a backend team and own features from requirements and system design through implementation, testing, and production deployment.
Own personal loans end to end (the company's highest-revenue product), from system design through implementation, testing, and production deployment.
Own the BNPL product end to end: credit lines, confirmation and one-shot payment flows, and dynamic plans.
Built and owned Sunflow, the multi-channel messaging product driving collections (cobranza) over WhatsApp, SMS, email, and voice.
Lead the AI-model integration with the data team, wiring embedding- and LLM-powered features into the platform.
Build fault-tolerant money movement (idempotency, timeouts, circuit breakers, compensation) so payments come out right even when a step fails.
Built CI/CD across 20+ services in both GitLab CI and GitHub Actions, and contribute to GitOps delivery with ArgoCD on GKE.
Instrumented the platform with Datadog (APM, logs, traces) and contribute to the cloud infrastructure managed with Terraform.
Engineering approach
Own the system
Capabilities grouped by the problems they solve, not by a proficiency score.
Correct transactional workflows, recovery paths, and state that can be reconciled.
Typed APIs, durable messaging, and data systems designed around failure.
Cloud infrastructure, repeatable releases, observability, and testable operations.
The languages and tools to take an idea from prototype to production.
Correct transactional workflows, recovery paths, and state that can be reconciled.
Typed APIs, durable messaging, and data systems designed around failure.
Cloud infrastructure, repeatable releases, observability, and testable operations.
The languages and tools to take an idea from prototype to production.
Courses and certifications across AI, cloud, infrastructure, and engineering.
I'm Nicolás, a backend engineer who likes the problems that show up when things fail: distributed systems, idempotency, integrations that have to recover on their own. I work mostly in TypeScript and NestJS on GCP and Kubernetes, with Python and Rust for fun. Outside the day job I ship side projects (AI agents, data platforms, mobile apps) to keep learning across the stack.
Contact
The fastest way to reach me is by email or LinkedIn.