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Backend developer and architect with 15+ years’ experience building e-commerce and digital platforms. Proven track record delivering in international contexts, combining technical leadership with pragmatic engineering. Recognised for long-term consulting relationships, reliability, and clear stakeholder communication across distributed teams.…

Mathieu Crétien

Back-End Developer, Web Developer, Developer, +2

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Backend developer and architect with 15+ years’ experience building e-commerce and digital platforms. Proven track record delivering in international contexts, combining technical leadership with pragmatic engineering. Recognised for long-term consulting relationships, reliability, and clear stakeholder communication across distributed teams.…

Available to hire

Backend developer and architect with 15+ years’ experience building e-commerce and digital platforms. Proven track record delivering in international contexts, combining technical leadership with pragmatic engineering.

Recognised for long-term consulting relationships, reliability, and clear stakeholder communication across distributed teams.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

French

Fluent

English

Fluent

Work Experience

Technical Consultant at Neolena (side business)

January 1, 2017 - Present

Long-term advisory and development coaching for an e-commerce platform. Rebuilt a 7,000+ SKU catalog, enabling sustained double-digit growth. Delivered features across catalog, inventory, checkout, and marketing workflows; introduced AI-driven enrichment and multi-channel synchronization with marketplaces and social platforms; implemented secure, cloud-based infrastructure with zero-downtime deployments.

Senior Backend Developer at KaraFun Group

June 1, 2025 - October 1, 2025

Led the modernisation of core search infrastructure, architecting a scalable Symfony-based search framework for 7+ platforms, ensuring zero downtime during migrations and high traffic. Delivered 10+ REST API endpoints with multi-entity aggregation and scoring, modernised APIs, improved testing and profiling, and enhanced performance.

Lead Developer at Christian Louboutin

February 1, 2022 - September 30, 2024

Led backend architecture for a multi-region luxury e-commerce platform (20+ countries). Delivered 15+ platform initiatives, managed an agile team of 8+ engineers and 30+ stakeholders, and guided country rollouts with cutover/rollback strategies. Evolved third-party integrations (PIM, WMS, ERP, social platforms), built Single Customer View, and implemented AI-driven product recommendations and an automated merchandising pipeline.

Senior Backend Developer at KaraFun Group

January 1, 2020 - June 30, 2021

Overhauled core search infrastructure for customers and internal teams; rebuilt indexing/mapping workflows (ETL), created a shared search framework, tuned queries for relevancy and scalability, and expanded multilingual and auto-suggest capabilities.

Senior Backend Developer at NZ Police

May 1, 2019 - October 31, 2019

Rebuilt critical public websites and supporting APIs; established automated deployments and new coding standards; advised technical and media/PR teams on delivery and communication.

Senior Backend Developer at Balance Internet, Foxley

October 1, 2016 - August 31, 2018

Delivered backend engineering for e-commerce and SaaS builds, supported large Magento 2 migrations, and built membership/billing platforms with integrated payments, CRM, LMS, and support tools; implemented APIs, background processing, and CI/CD for scalable systems.

Senior Backend Developer at M&C Saatchi

October 1, 2014 - July 31, 2016

Joined the digital engineering team to design scalable systems and promote DevOps practices; delivered bespoke CMS and APIs; automated server provisioning; introduced AWS-based architectures; mentored developers and supported recruitment.

Backend Developer at Lean Mean Fighting Machine

April 1, 2012 - September 30, 2014

Advanced development of multilingual CMS sites and REST modules; rebuilt a high-traffic charity site, prototyped innovative campaigns, and delivered API-driven projects for rapid delivery.

Junior Developer at Strasbourg digital agencies

July 1, 2008 - November 30, 2011

Developed PHP-based e-commerce, CMS and mobile solutions; led delivery of Magento projects; designed APIs powering iOS apps; deployed enterprise workflow components.