François Koessler
Ingénieur Logiciel Senior at KHAWA TECHNOLOGY
Strasbourg, Grand Est, France
Summary
👤
Senior🎓
Top SchoolFrançois Koessler est ingénieur logiciel senior basé à Strasbourg avec plus de 11 ans d'expérience dans le développement full-stack et la direction technique de projets e‑commerce et startups. Co-fondateur de Khawa Technology, il combine expertise Ruby on Rails, JavaScript (Stimulus, React, Next.js) et pratiques DevOps pour piloter des produits du MVP à la maintenance à grande échelle. Diplômé de l'INSA Lyon, il allie rigueur d'ingénieur et sens produit pour livrer des solutions performantes, sécurisées et maintenables. Il a contribué au cœur de l'écosystème e‑commerce open source en participant au projet Spree, en améliorant la fiabilité des services et des calculs monétaires. Pragmatique et orienté valeur, il accompagne startups et PME sur l'architecture, l'optimisation et le transfert de compétences. En plus du développement, il gère aussi les aspects clients et administratifs de son agence, ce qui renforce sa vision opérationnelle des projets.
11 years of coding experience
6 years of employment as a software developer
Engineer, Telecoms, Engineer, Telecoms at INSA Lyon - Institut National des Sciences Appliquées de LyonMaster's degree, Telecommunications Engineering, Master's degree, Telecommunications Engineering at INSA Lyon
English, Chinese
Stackoverflow
7,036reputation
991kreached
98answers
70questions
symfony
top-5%
proxy
top-5%
php
top-5%
routes
top-5%
doctrine-orm
top-5%
Github Skills (26)
ecommerce10
rails10
ruby10
spree10
ruby-on-rails10
spreed10
debugging9
proxy9
symfony9
php9
model-validation9
doctrine-orm9
routes9
apidoc8
api8
Programming languages (5)
Github contributions (5)
spree/spree
Jan 2019 - Sep 2022
Open Source eCommerce Platform for B2B, Marketplace, and Enterprise. REST API, TypeScript SDK, and production-ready Next.js storefront. Self-host it. Own your stack. No vendor lock-in. Zero platform fees.
Role in this project:
Backend Developer
Backend DeveloperContributions:9 commits, 6 PRs, 1 comment in 3 years 8 months
Contributions summary:François primarily contributed to the backend logic of the Spree e-commerce platform. Their work included fixing bugs related to namespaces and currency precision within shipping calculations, and they refactored service objects to return more reliable success/failure states. The user also addressed issues related to model validations, specifically handling case sensitivity, along with other minor fixes to improve the application's overall reliability and functionality. The user demonstrated strong skills in working with the Spree framework, models, and services.
ecommercenextjsrestrest-apitypescript
khawatechnology/khawatechnology
Mar 2018 - Jul 2026
Contributions:5 reviews, 49 PRs, 85 pushes in 8 years 4 months
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