Zackary Beaugelin
Senior Backend Engineer
Python · FastAPI · Pydantic · PostgreSQL · API Architecture
I build robust backend systems for modern products — from clean API design and business-critical services to migrations, developer tooling, and AI-enabled backend workflows.
Based in the South of France · Open to remote and hybrid opportunities
Backend systems built for production, not demos
I’m strongest where product complexity meets engineering quality: APIs, migrations, architecture, maintainability, and delivery under real-world constraints.
Backend Architecture
I design services that stay understandable as they grow: clear boundaries, robust domain logic, maintainable codebases, and API contracts teams can trust.
Python & FastAPI
I build typed, testable, production-grade Python services with a strong focus on validation, performance, and developer experience.
Data & Reliability
From PostgreSQL modeling to background jobs, integrations, error handling, and observability, I care about systems that behave well under real-world pressure.
Technical Leadership
I help teams move faster with better foundations: improved code quality, pragmatic standards, mentoring, and architecture decisions that reduce long-term friction.
Case studies that reflect how I think and ship
A selection of backend-focused work spanning API design, modernization, platform quality, and AI-enabled services.
FastAPI service architecture for production APIs
Designed and evolved Python backend services with strong schema validation, maintainable architecture, and production-safe delivery practices.
Legacy system modernization without stopping delivery
Improved older backend systems incrementally by reducing technical debt, clarifying responsibilities, and introducing safer development patterns.
Authentication and business-critical backend flows
Built backend flows where correctness, edge cases, and consistency mattered as much as speed.
AI-enabled backend systems
Worked on backend systems integrating structured AI workflows, typed outputs, orchestration logic, and developer-friendly patterns.
Need a senior Python backend engineer?
Whether you’re scaling an API, modernizing a legacy backend, or shipping a critical product feature, I’m open to the right senior backend roles and selected freelance missions.