Jani Niemelä
Software Engineer at Swarmia
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolJani Niemelä is a pragmatic software engineer based in Helsinki with 11 years of professional experience and roughly 13 years coding across Java, C#, C++, Node, TypeScript and Python. He has driven backend and payments work at scale—building an in-house eCommerce platform that processes millions of transactions, added 10+ local payment methods, improved card authorization rates, and launched multi-region fulfillment to optimize cost and delivery. Comfortable across stacks and infra, he’s implemented Kubernetes-based services, PostgreSQL-backed systems, Celery/PubSub pipelines and SRE practices with Datadog, while also writing Java/Spring backends and Angular frontends earlier in his career. Jani pairs product-minded experimentation (A/B tests that materially increased checkout conversion and AOV) with strong operational focus on observability and fraud reduction. He’s experienced in hiring and interviewing (100+ candidates) and in enabling non-developers by shipping admin tools and expression engines that reduce reliance on engineering. Curious and hands-on, he balances deep technical craft with measurable business impact.
11 years of coding experience
7 years of employment as a software developer
Computer Science Information Technology, Computer Science Information Technology at Lapland Vocational CollegeBachelor of Engineering - BE information and communication technologies, Bachelor of Engineering - BE information and communication technologies at Kajaani University of Applied Sciences
English, Finnish
Github Skills (19)
typescript9
dts6
typescript-definitions5
test-data4
testing4
javascript-objects4
javascript3
jotai2
storage1
json1
game-engine1
translation1
json-storage1
game-dev1
cpp1
Programming languages (3)
Github contributions (5)
siquel/KulmaSimulator
Jan 2015 - May 2015
Contributions:1 release, 118 commits, 121 pushes in 3 months
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