Julien Mercier-rojas
Senior Backend Data Engineer
Paris, Ile-de-France
Summary
👤
Senior🎓
Top SchoolJulien Mercier-rojas is a Senior Backend Data Engineer based in Paris with over a decade of hands-on experience industrializing web projects and guiding teams toward robust architectures, CI/CD and strong quality practices. With a 20-year background as a lead developer in PHP and broad exposure to microservices, DDD and CQRS, he combines practical coding experience with architectural vision to solve performance, security and scalability challenges. He has led migrations and integrations at scale—from designing asynchronous microservice platforms to implementing automated testing and quality controls—while coaching teams on Agile and DevOps practices. Julien blends consultancy and in-house roles, frequently delivering audit-driven roadmaps and migration plans that minimize disruption and accelerate delivery. An educator at heart, he consistently emphasizes team training and knowledge transfer alongside technical outcomes.
11 years of coding experience
14 years of employment as a software developer
MIAGe, MIAGe at Université Paris-SorbonneLicence d'informatique, Licence d'informatique at UVSQ Université de Versailles Saint-Quentin-en-Yvelines
English, German
Stackoverflow
21reputation
326reached
2answers
1question
Github Skills (128)
composer10
conventional-commits10
static-analysis10
bundle10
php-framework10
symfony-bundle10
git-hooks10
symfony10
cron-expression10
php10
composer-plugin10
equivalent9
stream9
pmd9
uploader9
Programming languages (8)
Github contributions (5)
Jeckel-Lab/advanced-types
Nov 2019 - Jul 2021
Advanced PHP types for DDD projects
Contributions:12 releases, 38 PRs, 73 pushes in 1 year 7 months
dddsymfony-bundlephpcqrsenum
jeckel/docker-php-test
Mar 2019 - Apr 2021
Collection of docker PHP image dedicated for tests and CI
Contributions:20 PRs, 51 pushes, 21 branches in 2 years 1 month
docker-imagexdebugphpdedicateddocker
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