Application developer
Web & mobile apps — Fullstack & DevOps
Technical audit, engineering package or Tech Lead. Mobile MVPs, web and mobile apps with a modern stack and measurable outcomes.
"Jean-Sébastien is an accomplished fullstack engineer: front, back and even DevOps, with a strong infrastructure sensitivity that helped him build a solution close to the highest security standards for health data."
What I solve for you
Failing architectures, runaway costs, blocked teams — a structured approach changes the game.
Common problems
- — Exploding costs, recurring bugs
- — Disappointing performance, frustrated users
- — Blocked team, unreadable code
- — No path to scale
What you get
- Cost reduction through an optimized architecture
- Performance and a properly designed database layer
- Clean code, documentation, autonomous team
- Modular, scalable architecture
Technical skills
Modern stack and architecture patterns for web and mobile apps.
Recent projects
Software engineering work.
Microservices architecture
Microservices for a complaints management application
40% response time reduction, improved scalability and maintainability
Payment gateway API
Development of a multi-provider payment gateway API
Centralized 15+ services, improved security and reliability
Mobile app (healthcare)
Mobile MVP: building a health management mobile app in React Native as a fullstack engineer
Improved patient productivity and quality of life
Methodologies
Approaches for robust, scalable systems.
Architecture Driven Development
Architecture-first approach to ensure quality and maintainability
Domain-Driven Design
Model the business domain for a consistent, evolvable architecture
Clean Architecture
Separation of concerns for a maintainable, testable codebase
Security by Design
Integrate security from day one
Value added
What engineering brings to your project.
Performance
Scalability and optimization
Security
Security from the start
Team
Mentoring and training
Scalability
Controlled growth
Packages
Audit, day rate or Tech Lead — depending on your needs.
Architecture audit
2 days
Assessment of your architecture with a report and optimization plan.
- Full technical audit
- Report and recommendations
- Results presentation
Day rate
1 month min.
Fullstack support: architecture, development, support.
- 20 days of delivery
- Architecture & development
- Documentation
Tech Lead
20 days
Technical leadership, team organization, hiring.
- Leadership & org
- Hiring & enablement
- Technical strategy
Guarantees
Your satisfaction comes first.
Performance
Measurable improvement or refund
Delivery
Commitment on timelines
Satisfaction
Support until you’re satisfied
Ready to move your project forward?
Audit, engineering package or Tech Lead — choose what fits you.