Bruno Sarmiento
Nine years shipping full-stack products end to end — lately, teaching agents to do the boring parts.
The short version of a long story
I started in computer science at Tecnológico de Costa Rica — later adding a data science certificate — which taught me two things: how systems fail, and that most of them fail at the seams. So I've spent nine years working the seams — backend, frontend, infrastructure, and the conversations in between — across telecom, SaaS, and startups, including leading the migration of 40+ legacy MuleSoft APIs to Node.js for a U.S. telecom.
In 2024 I co-founded Nexora, a multi-tenant event ticketing SaaS for Latin America. Two engineers, the whole stack: 200+ endpoints, four React frontends, payments in two rails, ticket scanning at the door, and the occasional support ticket at 2am. Building a product end to end with no one to hand things off to is the best architecture course I never paid for.
These days a growing share of my work is applied AI — agentic workflows with the Anthropic Agent SDK, Claude Code, and MCP. Not chatbots bolted onto products: agents wired into real pipelines, doing work you can measure.
Where the nine years went
Building a multi-tenant event ticketing SaaS for Latin America end to end, as one of two founding engineers.
- Architected full platform: 200+ REST endpoints, 120+ stored procedures, multi-tenant RBAC
- Built 4 React/TypeScript frontends: admin dashboard, customer checkout, super-admin, offline ticket scanner PWA
- GCP infrastructure (Cloud Run, Cloud SQL) via Pulumi IaC, K8s + Tekton CI/CD
- AI agent system on Anthropic Agent SDK, Claude API, and MCP — automating git workflows, code search, build/test, and PR creation
- Dual payments: Stripe (+ Apple/Google Pay) and SINPE Móvil with reconciliation and commission tracking
Senior backend engineer and de-facto tech lead on two U.S. telecom engagements (CCI, Frontier).
- Led migration of 40+ legacy MuleSoft APIs to Node.js at CCI (U.S. telecom)
- Set backend architectural direction: service boundaries, API contracts, integration standards
- Raised engineering standards — testing coverage, documentation practices, CI conventions
- Mentored junior/mid engineers; default escalation for non-trivial architectural questions
Six years shipping client products across React, React Native, iOS, and Node.js — and learning that boring technology is usually the right call.
- Shipped features across React, React Native, iOS (Swift/Obj-C), Node.js, Laravel, Flask
- Led refactors of legacy codebases — introduced test coverage, cut incident rates
- Clients: Lucidpress (Marq), Chick-fil-A Supply, Carely
Built a platform where CS students pitted autonomous Python agents against each other in head-to-head tournaments.
- Built platform where CS students submitted autonomous Python agents for head-to-head tournaments
- Django web app, sandboxed execution runtime, match engine with scoring and replay visualization
Plus a Data Science certificate (2020) and a steady diet of side projects since.
Things I've built
Each card opens a live, interactive demo — right here on the page.
A distributed task queue with dead-letter recovery, priority scheduling, and real-time throughput monitoring.
TypeScript
PostgreSQL
Redis
React
Streaming pipeline that ingests payment events, enriches with merchant data, matches against ledger entries, and routes to analytics.
Node.jsKafkaClickHouseReact
Terminal session recorder that captures, replays, and shares shell sessions as lightweight casts.
TypeScriptNode.jsWebSockets
Zero-dependency static site generator. Markdown in, HTML out. No config, no bloat, no drama.
TypeScriptNode.jsMarkdown
Real-time transaction scoring engine with feature extraction, risk profiling, and human-in-the-loop review.
PythonTypeScriptPostgreSQLReact
Tools of the trade
Node.js TypeScript 
Express Python 
Django 
Laravel React React Native 
Next.js 
Vite 
Tailwind TanStack Query Anthropic API Agent SDK Claude Code MCP Prompt Engineering 
GCP 
AWS 
Docker 
Kubernetes 
Pulumi Tekton CI/CD PostgreSQL 
MySQL 
Firestore DynamoDB Notes from the desk
Thoughts on building software, working with AI, and the craft of shipping products.
On the distinction between writing code and shipping products, and how AI changes what's possible for a single engineer.
The tools, patterns, and trade-offs behind the Node.js APIs I build — from project setup to production monitoring.
Reflections on remote work, the Latin American tech scene, and carving out a corner of the internet that's yours.
Say hello
Open to remote senior/principal roles and the occasional consulting engagement. Replies within a day — usually faster.
