Freelancer profile translated to English.
Back to original languageAbout Guillaume
Fullstack Web Developer .NET React
💻 7 years of experience in developing web applications and solutions, specializing in .NET Core (C# 12) and React.js / Next.js.
👔 Experience as a .NET Expert and IT Project Manager for major clients
🚀 Founder of Aktislab, a Lyon-based development agency generating nearly €300k in annual revenue, dedicated to designing custom software solutions.
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Key Skills
• Front-end : React.js, Next.js (6 years), TailwindCSS, SCSS, Material-UI
• Back-end : .NET Core / ASP.NET (5.5 years), Node.js / Express.js
• Databases : SQL Server, PostgreSQL (6 years), MongoDB
• DevOps & Tools : Docker, JIRA, Azure DevOps, GitHub Actions
• Management & Methodologies : Project Management (5 years), Agile/Scrum, technical architecture design, wireframing
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Education
🎓 Master 2 – Epitech – Regional Valedictorian
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Notable Experiences
• AirLiquide (Major client, CAC40) : Developer & IT Project Manager for 2 years.
➝ Managed a SaaS platform for monitoring sleep apnea care equipment.
➝ Managed a team of 2 developers, providing technical and functional coordination.
• Bioconnect (Creusot-Montceau Urban Community) : Design and deployment of an innovative solution for collecting organic waste via connected bins.
➝ Integrated a gamification system to encourage citizen adoption.
➝ Project won in a public tender.
• HAD Soins & Santé : Development of a custom patient management solution to optimize home care patient monitoring and coordination.
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Mobility
📍 Based in Lyon – Travel possible in the Auvergne-Rhône-Alpes region and beyond if necessary.
🎯 Serious, rigorous, and passionate, I combine technical expertise, product vision, and entrepreneurial experience to support companies and organizations in their digital transformation.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Lyon (up to 50km)
Experience
- Key4events
On Malt
Development of secure REST APIs and enhancement of application capabilitiesSOFTWARE PUBLISHINGJanuary 2026 - February 2026Lyon, FranceIntervention on the evolution and reliability of an existing application workflow, with refactoring of conditional logic and removal of blocking dependencies to improve overall system consistency.- Development and integration of several secure REST endpoints in .NET, based on PostgreSQL, including real-time calculation mechanisms, typed data aggregation, and robust handling of edge cases. The whole was documented via OpenAPI to ensure clear exploitation by integrators.
- Implementation of front-end fixes and adjustments (React) to ensure alignment between the API layer and the user interface, with particular attention to application state stability and consistency.
- Setup of a fully dockerized local development environment, including service orchestration, image rebuild management, and command automation via a dedicated Makefile to streamline the developers' workflow.
- Implementation of a dynamic multi-scenario seeding system to generate consistent datasets according to different contexts, controllable via a custom CLI developed specifically for the project to improve reproducibility and testing.
- Integration of a technical documentation engine based on MKDocs to structure, centralize, and perpetuate project documentation.
- APRIL MARINECreation of a Postman flow for creating Planner 365 tasks via Microsoft Graph APIs.BANKING AND INSURANCEDecember 2025 - December 2025Implementation of a Microsoft Planner integration via Microsoft Graph, with secure application-mode authentication (daemon / client credentials).I designed a complete Postman collection allowing to create, modify, and organize Planner tasks (assignment, labels, bucket movement, details management), while correctly handling the authentication and concurrency constraints imposed by Microsoft.The deliverable now allows for automated and reliable Planner control, without user dependency, and serves as a basis for automation scenarios and internal tooling.
- Communauté Urbaine Creusot MontceauApplication Architect - Bioconnect – Organic Waste Management PlatformENVIRONMENTALOctober 2024 - January 2026 (1 year and 3 months)Le Creusot, FranceDesign and development of a complete business platform for organic waste management for a local authority, integrating users, field operators, and administration, with direct interaction with connected bins.The product covers the entire chain: citizen drop-off, organic waste tracking, field collections, administrative management, and technical monitoring, in a context of real production and public use.
Scope & Responsibilities
Architecture and development of a microservices backend (authentication, organic waste tracking, bins, collections, support)
Implementation of critical workflows:• drop-offs via QR code and temporary codes• collection orchestration• state management (organic waste tracking, lockers, cabinets)• Integration of connected locks (external API)• Development of front-end interfaces:• users (citizens)• operators (field tablet mode)• administration (management, KPIs, email campaigns)• Management of asynchronous and scheduled processes (jobs, notifications, automatic validations)Deployment and operation:• Docker containerization• monitoring and alerting• backups and restoration• security, audit, GDPR compliance (anonymization)Results & Operation
• User satisfaction rate ~90%, measured on actual field usage• Quality rate close to 100% for drop-offs and collections (rare, non-blocking incidents)• Stable, maintainable platform operated daily by non-technical staff• Ability to evolve the product without compromising existing systemsChallenges Addressed
• Application used by the general public → very low tolerance for malfunctions• Critical business data (traceability, history, statistics)• Field constraints (collections, equipment, connectivity)• Long-term maintainability in a public service context
Reviews
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Education
- Master msc, Transformation digitaleEPITECH - European Institute of Technology2022Master msc, Transformation digitale. Major régional promo 2022.
- Bachelor's degree, InformatiqueEPITECH - European Institute of Technology2020Bachelor's degree, Informatique