Nestor G Pestelos Jr
Senior Software Engineer
nestor@pestelos.net · GitHub · LinkedIn · Knowledge System
I build, modernize, and scale production Ruby on Rails systems.
25 years of shipping software.
What I Do
Legacy Rails Modernization
Upgrade aging Rails codebases without breaking production. Most recent: modernized a 1M+ line Rails application to 91% test coverage with 3,797 passing tests and 40+ automated linters.
Payment System Integration
End-to-end payment infrastructure — Stripe, Square, PayPal, Avalara tax. Integrated payment gateways for e-commerce platforms serving US, AU, and NZ markets.
AI-Augmented Engineering
Claude Code power user with 256 custom skills, MCP server integrations, and automated knowledge systems. I help teams adopt AI tooling to ship faster without cutting corners.
Track Record
- 25 years building production software
- Fully remote — UTC+8 provides overnight coverage for US teams
- 1M+ LOC Rails modernization, 91% test coverage
- Payment integrations across 6+ providers and 3 markets
- 256 custom AI skills, 3 MCP servers built
- BS Computer Science, University of the Philippines