Øyvind Gulbrandsen
Senior Backend Engineer at PayPay Corporation
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolØyvind Gulbrandsen is a Senior Backend Engineer based in Tokyo with 10 years of experience building large-scale backend systems, search and retrieval platforms, and data-heavy product features. Currently at PayPay he helps power a coupon system used by over 20 million people, and previously led backend efforts at Nomura delivering RAG tools and banker-facing reporting portals. His background spans startups and enterprise consulting—Atilika, Deloitte, and R&D roles—where he focused on vector search, Elasticsearch retrieval, automation, and prototype AI vision systems. Trained in cybernetics and robotics across NTNU, UCSB and the University of Tokyo, he blends research-driven thinking with pragmatic production delivery. Outside work he’s often found surfing near Enoshima or biking around Yoyogi, a reminder that his engineering instincts are matched by real-world curiosity and endurance.
10 years of coding experience
6 years of employment as a software developer
University of TokyoExchange student (Extension), Computer Science, Exchange student (Extension), Computer Science at University of California, Santa BarbaraNorwegian University of Science and Technology
Norwegian, English, japanese (jlpt n2)
Github Skills (13)
kotlin10
dao10
sql9
orm8
mysql7
sqlite7
perceptual-losses4
generative-adversarial-network4
encoder3
stylegan2
deep-learning2
tensorflow1
cyclegan1
Programming languages (4)
Github contributions (5)
oyvindhg/TTK7-AdaptiveDataAnalysis
Oct 2017 - Feb 2019
Contributions:12 commits, 10 pushes, 1 branch in 1 year 3 months
oyvindhg/personal-website
Mar 2021 - Nov 2021
Contributions:2 PRs, 47 pushes, 3 branches in 7 months
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