Freelancer profile translated to English.
Back to original languageAbout Guillaume
New to freelancing, I bring 12 years of technical expertise to your growth. I have designed and stabilized critical systems handling millions of operations for companies like Mailjet or Andjaro.
My goal? To transform your technical challenges into business levers with a partner approach, not just an executor.
Total Ownership: I take responsibility from design to production, ensuring every technical choice serves your product.
Quality & Robustness: Specialist in distributed and fault-tolerant systems, I build durable architectures capable of supporting massive scaling (millions of events).
Technical Pragmatism: No unnecessary hype. My technology choices (Elixir, Go, React) are always guided by your business context and delivery constraints.
Backend & Systems: Elixir & Phoenix/OTP expert for ultra-performant and highly available distributed systems. Full-stack &
Mobile: Delivery of impeccable web and mobile interfaces via React and React Native.
Modernization & Legacy: Audit and transformation of monoliths to microservices, reduction of technical debt, and critical data migrations without downtime.
Ops Culture: Reliable and automated delivery through native mastery of Docker and CI/CD pipelines.
French
Native or bilingual
English
Fluent
Can work on-site
Lille (up to 50km)
Experience
- AndjaroSenior Software DeveloperHUMAN RESOURCESOctober 2021 - April 2026 (4 years and 6 months)Paris, France
- Development of core HR platform features in Elixir/Phoenix
- Maintenance and modernization of legacy Symfony systems while preserving production stability
- Co-architecture of mobile workflows with React and ClojureScript integration
- Design of integration interfaces with payroll, ERP, planning, and HRIS ecosystems
- Collaboration within an international remote-first engineering team
- Indépendant (Pagily)Freelance Software EngineerSOFTWARE PUBLISHINGDecember 2019 - October 2021 (1 year and 10 months)Lille, France
- Led technical direction and product architecture decisions
- Developed backend services in .NET/C# for secure document processing and indexing
- Developed the frontend application in React and the mobile application in React Native
- Implemented an OCR/ML chain for classification and indexing
- Designed integrations with multifunction printers and scanning equipment
Technologies: .NET, C#, React, React Native, PostgreSQL, OCR/ML - Shipfix (Veson Nautical)Software DeveloperTRANSPORTATIONApril 2019 - November 2019 (7 months)Paris, France
- Developed backend services in Python and Elixir for real-time processing
- Implemented data extraction and email parsing features based on ML
- Developed interactive workflows in Vue.js for opportunity matching
- Contributed to collaboration tools and real-time analytics features
Technologies: Python, Elixir, Vue.js, ML/AI, PostgreSQL, Docker
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Education
- Master in Computer EngineeringEfficom2013