Denis Koljada
Staff Android Engineer at Oviva
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolDenis Koljada is a Senior Android Engineer based in Berlin with 11 years of experience building full-stack applications and scalable distributed systems using Kotlin and Java. He specializes in designing robust, production-grade distributed architectures and has moved between hands-on engineering and leadership roles, including CTO and freelance Android work. Currently at Oviva after senior engineering work at DB Systel and product-focused roles at SPRYLAB, he blends backend system thinking with polished mobile experiences. Denis is exploring on-device machine learning, bringing ML inference considerations into app architecture and performance trade-offs. He holds a Master’s in Information Systems Management from Technische Universität Berlin, pairing formal systems training with practical delivery experience. A pragmatic engineer, he often bridges the gap between distributed backend constraints and responsive client-side UX.
11 years of coding experience
9 years of employment as a software developer
Master Information Systems Management, Master Information Systems Management at Technische Universität Berlin
German, English, Russian, French
Github Skills (55)
kotlin9
kotlin-multiplatform-mobile9
kotlin-multiplatform9
compose-multiplatform9
jetpack-compose9
directed-graph8
boilerplate8
android8
ios8
javascript7
pdf-document7
webpack7
eslint7
openfaas7
mongodb7
Programming languages (6)
Github contributions (5)
justdeko/piley
Oct 2023 - Jul 2026
piley is a small To-Do app that uses piles to manage your tasks.
Contributions:4 reviews, 323 PRs, 521 pushes in 2 years 8 months
androidjetpack-composekotlincompose-multiplatformkmp
justdeko/graphhopper
Dec 2021 - Apr 2022
Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.
Contributions:34 commits, 29 pushes, 2 branches in 3 months
javaopenstreetmapwebserver
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