Stephan Wallentin
Self-employed Passionate Developer
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
16 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 (20)
persist7
sec6
event-data6
dedicated6
api5
tink5
nodejs4
quake4
input-field4
dedicated-server4
mongodb4
react3
redis3
material-ui2
cdp2
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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