~ / gustavo-chain

Gustavo Chaín
Go Engineer & Consultant

10+ years building distributed systems in Go. Bitcoin custody, payments infrastructure, and technical leadership. Available for remote freelance and contract work.

Available for hire
Contact
Email hi@qustavo.cc ↗ GitHub github.com/qustavo ↗ LinkedIn qustavo ↗ X / Twitter @gchaincl ↗

// Based in Spain · Remote only · Available for contract & part-time

Services
Bitcoin Infrastructure CUSTODY · LIGHTNING · ON-CHAIN
Custody systems, wallet operations, LND/Lightning integration, on-chain tooling. Production experience at institutional scale (NYDIG) and payment processors. Security-first approach to key management and exfiltration detection.
Distributed Systems BACKEND · PROTOCOL DESIGN
Design and implementation of concurrent, fault-tolerant Go systems. Microservices decomposition, distributed tracing, observability, and service infrastructure — from early-stage to 40× growth.
Go Codebase Rescue AUDIT · REFACTOR · REVIEW
Introducing testability, cleaner abstractions, and benchmarking practices into existing Go codebases. API design review, CI/CD hardening, and team standards. Done it at Typeform, NYDIG, and Clover Labs.
Fractional Lead Engineer PART-TIME · ONGOING
Embedded part-time engineering lead for early-stage teams. Mentorship, code standards, reliability practices. Available for 10–20h/week engagements — the same role I played at Clover Labs.
Open Source
httplab
Interactive web server — inspect, replay, and manipulate HTTP traffic in real time
★ 4.2k
dotsql
Keep SQL in .sql files, load and reference them from Go — clean separation of queries from code
★ 745
sqlhooks
Attach hooks to any database/sql driver — logging, tracing, metrics, without changing your queries
★ 665
More on GitHub →
95 public repositories — open source tools, experiments, and work-in-progress
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About

I'm Gustavo Chaín, a Go engineer based in Spain with over 10 years of experience building distributed systems and backend infrastructure. Early engineer at Typeform (5 → 200 people), where I broke a PHP monolith into Go microservices and led architecture through 40× growth. More recently, I've spent 4+ years in Bitcoin — institutional custody at NYDIG, and leading engineering at a cryptocurrency payment processor.


I care about security-first development, testable systems, and engineering culture. I work best with small, focused teams where the problems are hard and the specs are clear.

Go / Golang Distributed Systems Bitcoin / Lightning On-chain Custody LND Rust Kubernetes Observability Protocol Design Team Mentorship Open Source