Alex Mercier
Senior Frontend Developer at Back Market
Toulouse, Occitania, France
Summary
👤
Senior🎓
Top SchoolAlex Mercier is a Senior Frontend Developer with 14 years of experience building user-focused web applications, currently shaping checkout and payment experiences at Back Market to support global expansion. He specializes in Vue.js and Nuxt.js, leading complex projects from new payment method integrations (Klarna, Affirm, Apple Pay) to scalable multi-provider payment forms and Design System migrations. His background includes high-scale work at LinkedIn where he modernized publishing and video player platforms, and a strong open-source footprint producing developer tools and libraries that emphasize CI/CD and modularity. Alex combines an HCI master's perspective with hands-on engineering, advocating for testing, observability, and performance in production (Datadog, A/B testing). Notably, he has a history of full rewrites and productizing prototypes—skills he applies to payments and shipping flows to reduce friction and unlock new business models. Based in Toulouse, he balances deep frontend craft with cross-team collaboration and occasional sabbaticals to recharge.
14 years of coding experience
10 years of employment as a software developer
Master's degree Computer Science, Master's degree Computer Science at Université Paul Sabatier Toulouse IIIDUT Informatique, DUT Informatique at IUT de RodezMaster's degree Human Computer Interaction, Master's degree Human Computer Interaction at ENAC - Ecole Nationale de l'Aviation Civile
French, English, Spanish
Github Skills (200)
css-transitions10
web-application10
videojs10
linting10
webextension10
javascript10
hono10
html10
html5-video10
postmessage10
typescript10
eslint10
video-player10
karma-preprocessor10
mermaid10
Programming languages (12)
Github contributions (5)
amercier/angular-tour-of-heroes
May 2018 - Jan 2026
Angular Tour of Heroes tutorial with testing
Contributions:26 PRs, 177 pushes, 30 branches in 7 years 9 months
angulartesting
backmarket-oss/github-mermaid-extension
Apr 2019 - Jun 2019
A browser extension for Chrome, Opera & Firefox that adds Mermaid language support to Github
Contributions:31 commits, 4 PRs, 34 pushes in 1 month
browser-extensionchromefirefoxmermaidwebextension
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