Freelancer profile translated to English.
Back to original languageAbout Amaury
Entrepreneur & software engineer with 15 years of experience, specializing in Go backend, production, and reliability of critical systems.
I help SaaS startups, software vendors, and product teams stabilize their backend, bring order to an existing database, and secure what truly supports the business: APIs, PostgreSQL, external integrations, access rights, observability, CI/CD, and production incidents.
My role is often to arrive in an already moving context: an existing codebase, complex business flows, recurring bugs, delivery under pressure, an architecture that has become complex, or a critical service that must hold up.
I intervene to quickly understand the business, identify weak points, fix without overcomplicating, and deliver reliable improvements.
What I bring:
- Go backend development: REST/gRPC APIs, business services, PostgreSQL;
- Reliability of existing systems: recurring bugs, targeted technical debt, unstable behaviors;
- Incident resolution and production diagnostics;
- Progressive redesign of complex business domains;
- External integrations: payment, AI, brokers, third-party tools, partner APIs;
- Application security: JWT, mTLS, OIDC, access rights, simple hardening;
- Useful observability: logs, metrics, traces, alerts, and diagnostics;
- Pragmatic CI/CD with Docker, GitHub Actions, GitLab CI;
- Ability to work in Kubernetes environments without making Kubernetes the main subject.
I avoid unnecessary large projects. The goal is to understand what is putting pressure on the product or business, then fix what really matters.
They trusted me:
Cisco · Peer.inc · Seckiot · Lydia · Imok
I work well with founders, CTOs, and small product teams who need a senior profile capable of understanding the business, taking a step back, coding cleanly, and ensuring the reliability of critical subjects.
English
Native or bilingual
Spanish
Fluent
Italian
Conversational
French
Native or bilingual
Can work on-site
La Roche-sur-Yon (up to 50km), Paris (up to 50km), Rennes (up to 50km), Bordeaux (up to 50km), Toulouse (up to 50km)
Experience
- Peer.incSenior Golang Developer (Bazel/Gomobile)SOFTWARE PUBLISHINGNovember 2023 - February 2025 (1 year and 3 months)• Integration of OpenAI, Flux, MidJourney APIs• Development of Go microservices and a GoMobile framework compiled for Android/iOS, orchestrated with Bazel.• Implementation of MongoDB security models as well as JWT and mTLS authentication, successfully passing external penetration tests without any critical vulnerabilities.• Deployment of complete observability via Prometheus, Grafana, OpenTelemetry, and Jaeger, providing end-to-end tracing of each request.
- SeckiotSoftware EngineerTECHSeptember 2023 - November 2023 (2 months)• Bug fixing and maintenance of packet reassembly and fragmentation logic at the gopacket level, ensuring accurate session reconstruction under various network conditions.• Development of passive network probes in Go, integrating a custom DPI stack to capture and aggregate packet data for in-depth inspection.• Performance optimization at the gopacket level, improving processing paths to reduce latency and increase throughput.• Use of Wireshark for protocol analysis and DPI algorithm validation, leading to iterative improvements in detection accuracy.
- Majelan.Golang DeveloperCULTUREJuly 2023 - August 2023 (1 month)• Led the integration of OpenID Connect (with Ory) into the Majelan platform, ensuring secure and standards-compliant authentication for web and mobile.• Designed and developed a custom API gateway from scratch in Go, implementing routing, rate limiting, and JSON Web Token validation.• Collaborated closely with front-end, mobile, and DevOps teams to define interface contracts, improving inter-team delivery velocity.
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Education
- Computer EngineeringComputer Engineering School - Polytechnic University of Nantes2010