Matthieu Jacquet

At Certideal, I design, develop, and evolve multi-store payment systems across 16 European stores, integrating Klarna, Younited, Checkout.com, HiPay, PayPal, and Apple Pay. These systems process around 95% of the company’s revenue.

I built shared payment architecture around abstractions and reusable components, secure workflows for transactional consistency, and idempotent asynchronous webhook processing. I ensure a failed payment cannot result in shipment, while strengthening PCI-DSS/PSD2 compliance through automated order-payment consistency checks.

I also led a migration of more than 3 million rows across a customer base of over 4 million, allowing legacy and new code to coexist transparently for customers. I introduced structured Monolog logging to improve monitoring and incident resolution, and I contribute to technical decisions and onboarding.

I adapt to each project’s ecosystem rather than relying on one language, bringing reliability, reusability, and readability to the code. I’m targeting backend software engineering roles from November 2026, remotely or in the Montauban and Toulouse area.