Oliver Kossin
Symfony Developer at denkwerk GmbH
Cologne, North Rhine-Westphalia, Germany
Summary
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RockstarOliver Kossin is a Symfony developer based in Cologne with nine years of hands-on web development experience across agency and product-focused teams. He has steadily progressed through roles at brandung, QOSSMIC (formerly SensioLabs Deutschland), MASSIVE ART, and now denkwerk, building robust Symfony applications and client-facing web solutions. Comfortable across the full web stack, Oliver brings practical expertise in PHP/Symfony best practices, long-term maintenance, and integrating projects into production workflows. His background in agencies means he pairs technical craftsmanship with an eye for user-focused delivery and iterative improvements. Outside of work he’s an open-source enthusiast, reflecting a commitment to community-driven tooling and continuous learning.
9 years of coding experience
4 years of employment as a software developer
Github Skills (30)
sulu10
php10
symfony10
bundle9
admin9
cms9
user-management9
documentation9
symfony-bundle8
php-framework8
clean-architecture8
codeclimate8
content-management-system8
architecture7
conventions7
Programming languages (4)
Github contributions (5)
TheCadien/sylius-sulu-demo
Apr 2021 - Nov 2023
Contributions:1 PR, 2 pushes, 1 branch in 2 years 6 months
FriendsOfSulu/.github
Aug 2023 - Mar 2026
Contributions:1 review, 7 PRs, 16 pushes in 2 years 7 months
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