Jules Castagnet

Are you looking for a developer capable of designing, modernizing, or making your web and business applications reliable?

I help you develop robust, performant, and maintainable solutions, with an approach focused on business impact, technical quality, and speed of execution.

I am a full-stack software engineer, specializing in C#/.NET, React, SQL, Blazor, Python, PostgreSQL, and real-time architectures. I mainly work on projects involving web applications, backend APIs, internal tools, dashboards, SaaS platforms, or modernization of existing applications.

I have notably worked in a financial market front-office environment at Crédit Agricole CIB, on high-volume critical systems, with challenges related to performance, low latency, real-time streams, and application reliability. I have also contributed to B2B/IoT web platforms and data automation projects.

What I can concretely bring you:

- Full-stack application development in React / Next.js / .NET;

- Creation and optimization of robust backend APIs;

- Migration or modernization of legacy applications;

- Design of dashboards and business tools;

- Performance optimization and latency reduction;

- SQL database modeling;

- Implementation of tests, CI/CD, and clean code best practices.

What sets me apart: a dual product and technical sensibility. I don't just code a feature: I seek to understand your business needs, your operational constraints, and your objectives to deliver a useful, reliable, and scalable solution.

Autonomous, rigorous, and accustomed to demanding environments, I can quickly intervene within your teams to transform a complex need into a concrete solution.