Pierre-Alexandre Kofron

Over Pierre-Alexandre

Senior Ruby on Rails Engineer / Tech Lead with 12+ years of software engineering experience, including 8 years leading the technical development of a SaaS startup. I specialize in building, scaling and improving production Ruby on Rails applications, with strong expertise in PostgreSQL, Sidekiq, Redis, REST APIs, performance, testing and CI/CD. I have taken 6 SaaS products from initial design to production across B2B, B2B2C and B2G environments, including data-intensive platforms used at national scale. I am particularly comfortable joining an existing Rails codebase, understanding it quickly, identifying bottlenecks and technical debt, and delivering pragmatic improvements without unnecessary rewrites. My main areas of expertise include Ruby on Rails, PostgreSQL and PostGIS, complex SQL and query optimization, Sidekiq and background jobs, REST APIs, automated testing, GitLab CI/CD, Docker, code review, refactoring, performance optimization and production troubleshooting. I also use AI-assisted and agentic coding workflows to accelerate implementation, refactoring, testing, documentation and codebase analysis, while keeping architecture decisions, code review and production quality under human control. I bring strong technical leadership experience, including architecture decisions, mentoring, roadmap planning and collaboration with product teams. Available for Senior Ruby on Rails Engineer, Lead Developer or Tech Lead freelance assignments.

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