Kasper Hellström
Backend API Engineer at Stripe
Dublin, Ireland
Summary
👤
Senior🎓
Top SchoolKasper Hellström is a Backend API Engineer with 13 years' experience building scalable data pipelines, recommendation systems, and production ML at companies including Stripe and Twitter. He blends data engineering and backend expertise—Spark, AWS, Scala, Python and Postgres—to design low-latency systems that handle high incoming traffic. A former research assistant with an MSc in Machine Learning, he pairs academic rigor with practical delivery, having led teams and shipped SPA frontends when projects required full-stack ownership. Colleagues describe him as approachable and detail-oriented; he favors simple, elegant solutions that maximize value and learns new technologies quickly. Based in Dublin, he continues contributing code publicly (github.com/X455u) and balances deep systems thinking with hands-on API and infra work.
13 years of coding experience
7 years of employment as a software developer
Bachelor of Science (BSc), Software Technology, Bachelor of Science (BSc), Software Technology at Aalto UniversityThe University of Hong Kong (HKU)High School/Secondary Diplomas and Certificates, High School/Secondary Diplomas and Certificates at Mattlidens gymnasium
English, Finnish, Swedish, Chinese
Github Skills (29)
django10
java10
portal10
lms9
react9
frontend8
react-select8
visualization8
javascript7
agile7
data-visualization6
deep-learning3
server3
machine-learning2
inference2
Programming languages (6)
Github contributions (5)
X455u/a-plus
Jan 2015 - Feb 2021
Contributions:2 PRs, 7 pushes, 2 branches in 6 years 2 months
zebala/slimeball
Mar 2013 - Jan 2014
Contributions:25 commits in 10 months
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