Freelancer profile translated to English.
Back to original languageAbout Cyril
You have a critical backend to design, refactor, or make reliable, and you want someone who makes the right decisions the first time.
I am a software engineer and former CTO. I specialize in the architecture and development of demanding Java/Spring Boot backend systems, from specification to production.
What I bring you concretely:
- an architecture that handles load and remains maintainable over time (DDD, hexagonal, microservices);
- mastered distributed systems: event sourcing, CQRS, Kafka, asynchronous messaging;
- autonomous AWS infrastructure (ECS, EKS, Terraform), CI/CD, observability;
- a single point of contact who can frame the need, deliver the code, and deploy it to production.
What sets me apart: I spent three years leading the technology for a crypto wealth management application, with sensitive financial flows and real compliance constraints. I don't just code an architecture: I carried it alone, in production, under business and regulatory pressure.
Projects I work on:
- backend architecture design or redesign (monolith to microservices, implementing DDD/event sourcing);
- development of APIs and business services with strong logic (fintech, crypto, SaaS);
- technical framing and architecture choices upstream of a product;
- senior backend reinforcement on an existing project.
I can also deliver the front-end (Next.js) and mobile (Flutter) when you want a single end-to-end provider.
French
Native or bilingual
English
Conversational
Can work on-site
Nice (up to 50km)
Experience
- Expert CryptoFull-Stack DeveloperPRIVATE EQUITYFebruary 2026 - Today (6 months)Nice, FranceSaaS for crypto accounting aimed at accountants and IS-subject companies.I work on the product full-stack with a solid backend core: Next.js App Router, strict DDD, PostgreSQL. User journeys, accounting business rules, exports.On the UI side, modernization of the interface with shadcn/ui, Radix, and Tailwind, respecting an in-house design system. Migration of the front-end architecture from an FSD organization to a modular structure, with compliance to the UI kit.The business is demanding: crypto accounting, tax logic, reliability of calculations and exports. This is the type of SaaS where backend rigor is as important as the interface.Stack: Next.js, TypeScript, PostgreSQL, shadcn/ui, Radix, Tailwind.
- LedgityTechnical Director - CTOPRIVATE EQUITYSeptember 2021 - February 2026 (4 years and 5 months)Nice, FranceTechnical direction of a crypto wealth management application: reporting, performance and risk monitoring, transaction transparency.I designed and managed the backend architecture independently. Java/Spring Boot microservices, event sourcing and CQRS with Axon, Kafka messaging. The system handles sensitive financial flows, with the associated compliance and audit constraints.On the infrastructure side, I managed everything alone: AWS ECS/EKS, Terraform, CI/CD, observability. From design to production operation.I also consolidated a fragmented microservices architecture into a more maintainable structure, removed the dependency on Axon Server, and refactored the backend into hexagonal DDD modules. PostgreSQL optimization, Redis/Caffeine caching strategy, AWS Fargate Spot configuration for cost savings.Managed a team of 3. Implemented ACPR regulatory reporting on crypto transaction data.
- FlexperMobile DeveloperSOFTWARE PUBLISHINGApril 2020 - Today (6 years and 4 months)Biot, FranceFlexper is a technological accelerator that designs tailor-made products for innovative project leaders.I worked there as a mobile developer on several client applications, from design to production. Development in Flutter and React Native, on apps connected to real-time backends.Among the projects, Telaqua: an intelligent water and irrigation management solution for agriculture. Monitoring of hydraulic networks, connected sensors, control of field operations. The context imposes its constraints: outdoor use, variable connectivity, reliability of reported data.I worked in a product team (developers, designers, devops) on projects built from scratch, with real technical requirements.Stack: Flutter, React Native, Dart, TypeScript.
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Education
- Expert in Information Technology (level 1)Epitech