Matthieu Jacquet

Backend Software Engineer

Actively looking · Member since 4 Oct 2026

Message

Location: Montauban, France

Desired salary: from 40k EUR/yearly

Work preference: Hybrid / Full Time

Experience level: Mid

About

Professional summary

I am a Backend Software Engineer with around three years of experience in an e-commerce scale-up operating across approximately ten European countries. I specialise in designing reliable, critical payment systems that process the majority of company revenue.

I build maintainable software using object-oriented design, abstractions, reusable components, and clear architecture. I adapt to the ecosystem of each project rather than being tied to a single programming language or framework.

My experience includes payment-provider integrations, secure transactional workflows, idempotency, asynchronous webhook processing, complex state management, and PCI-DSS/PSD2 compliance. I focus on ensuring that payment and order processes remain consistent and resilient.

I have delivered large-scale live data migrations affecting millions of records without a maintenance window, while enabling temporary coexistence between legacy and new systems. I also contribute to monitoring, structured logging, technical decisions, and onboarding.

I use AI tools such as GitHub Copilot and Claude as daily engineering assistants, while maintaining a structured review process and critical validation of generated output. I am seeking a Backend Software Engineer role, preferably remote, or hybrid/on-site around Montauban and Toulouse.

Notice period: Around one and a half months, until the end of the

Tech stack & tools

Working toolkit

Data Stores

DBeaver

Development

Git

Linux

Experience

Career history

Backend Developer Certideal

Nov 2023 – Present

I design, develop, and evolve critical payment systems integrating Klarna, Younited, Checkout.com, HiPay, PayPal, and Apple Pay. These systems process approximately 95% of the company's revenue. I designed a shared payment architecture based on abstractions and reusable components to unify payment modules.

I implement secure transactional workflows, idempotency mechanisms, asynchronous webhook processing, and complex payment-state management. I strengthened PCI-DSS and PSD2 compliance through automated consistency checks between orders and payments, helping ensure failed payments cannot result in shipments.

I led a live large-scale data migration affecting more than 3 million rows across a database of over 4 million customers, without a maintenance window. The migration supported temporary coexistence between legacy and new code and was transparent to customers.

I introduced structured logging with Monolog to improve monitoring and incident resolution, contributed to technical decisions and onboarding, and use GitHub Copilot and Claude through a structured, critically reviewed workflow.

Full Stack Developer Intern Certideal

May 2023 – Oct 2023

I developed e-commerce features using PHP, Smarty, JavaScript, and SCSS. This role gave me practical experience working within a production e-commerce environment.

I became familiar with the company’s technical ecosystem and contributed to application development before transitioning into a permanent Backend Developer role.

Education

Learning history

École 42 Paris

May 2021 – Nov 2023

Junior Developer, Level 10, Software Development

Software development training including C/C++ and practical programming projects.

IMFP

2016 – 2017

Sound Technician, Sound Engineering

Training in sound technician practices.

CFA Automobile Formation 13

2011 – 2015

Vocational Baccalaureate, Automotive Mechanics

Vocational education in automotive mechanics.

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Backend Software Engineer

About

Skills