Stephan Wallentin
Engineering Manager at Code Jutsu AB
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolStephan Wallentin is a self-employed full-stack developer and agile practitioner with 14 years of experience designing and shipping web-based systems across startups and large companies in Stockholm. He specializes in JavaScript-driven stacks (Node.js, React, Angular, ES6) while also bringing backend expertise with Kafka, Spark, Cassandra, MongoDB and Redis, and familiarity with C# and Java. Stephan has led and coached teams in agile practices (Scrum, Kanban, Lean) and stepped into engineering management at Klarna, blending hands-on coding with technical leadership. He repeatedly implemented migrations and platform modernizations—such as React hook refactors, monorepo adoption and Gatsby migrations—improving developer workflows and delivery speed. Comfortable with open source and cloud deployments (Heroku, AWS, CI), he favors pragmatic, test-driven approaches and performance tuning for production services. Outside work he combines game-programming background and low-level C/C++ hobby projects with a continued appetite for exploring new stacks.
14 years of coding experience
14 years of employment as a software developer
Game Programmer Computer Science Linear mathematics Computer programming, Game Programmer Computer Science Linear mathematics Computer programming at Playground SquadWeb hacker Computer Science, Web hacker Computer Science at Ljud & Bildskolan
Github Skills (21)
sec7
tink7
event-data7
persist6
api6
quake5
dedicated5
cdp4
nodejs4
input-field4
dedicated-server4
mongodb4
react3
redis3
material-ui2
Programming languages (2)
Github contributions (5)
swallentin/ql-stats-engine
Nov 2015 - Nov 2015
Contributions:18 commits, 3 PRs, 14 pushes in 9 days
redisdedicated-serverevent-processordedicatedlive-game
swallentin/ql-stats-api
Nov 2015 - Nov 2015
Contributions:12 commits, 3 pushes, 1 branch in 13 days
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