Leo Toneff
Full Stack Developer at Sonair
Oslo, Norway
Summary
🤩
Rockstar🎓
Top SchoolLeo Toneff is a full stack developer based in Oslo with 7 years of hands-on experience building web platforms, internal tooling and developer-focused products. He founded Yello, a portfolio of 11 developer tools—including an image upscaler powered by DCNNs, a top-ranked SVG minifier and a leading ReDoS checker—and continues shipping developer utilities that solve niche but real problems. Leo has led frontend efforts for consumer and enterprise products like Unloc’s smartphone intercom and Control Center, and has built scalable backends and ETL systems across companies such as Vev, Netlife and Schibsted. Comfortable across Node/TypeScript, React/Next.js and cloud services, he pairs product-minded engineering with practical security and performance work (e.g., malware scanning and CVE/CPE search). He’s equally at home building polished UIs and low-level infrastructure, and often turns operational pain points into automated, reusable tools.
7 years of coding experience
8 years of employment as a software developer
Studiespesialisering med formgivningsfag, Studiespesialisering med formgivningsfag at Elvebakken VGS
Github Skills (163)
touchid10
typescript-definitions10
recharts10
unlock10
fingerprinting10
javascript10
fingerprint10
browser10
typescript10
fingerprintjs10
fraud-detection10
dts10
data-visualisation10
nextjs10
audio-fingerprinting10
Programming languages (7)
Github contributions (5)
bragle/Logica
May 2019 - May 2019
Contributions:31 commits, 30 pushes, 1 branch in 10 days
bragle/bragle
Aug 2020 - Nov 2023
Contributions:14 pushes, 1 branch in 3 years 4 months
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