Jun Tomioka
Software Engineer at Auxia
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolJun Tomioka is a hands-on backend engineer with 11 years of experience building high-throughput, production systems and cloud-native architectures. He designed and shipped event-sourced, Kafka-driven platforms and rule-driven achievements engines at Wolt, owning services end-to-end and scaling a team from solo owner to three engineers. His background includes solutions-architecture work at AWS where he led migration workshops and advised on cloud best practices, giving him both implementation depth and customer-facing architectural experience. He introduced practical hiring innovations like a Live Debugging interview to better assess real-world debugging and system-design skills in Japan. Comfortable across languages and stacks from Scala and Ruby to TypeScript and Kubernetes, Jun blends pragmatic engineering with strong documentation and cross-team alignment. Based in Tokyo, he often pairs functional-programming ideas with pragmatic product delivery—evident in past EHR and payment-adjacent systems where he applied Clean Architecture and snapshotting to tame production scale.
11 years of coding experience
10 years of employment as a software developer
Bachelor of Arts in Environmental Information or B.A., Music, Bachelor of Arts in Environmental Information or B.A., Music at Keio University
Github Skills (81)
wysiwyg10
redux-store10
cbor10
async10
kotlin-multiplatform10
protobuf10
json10
serialization10
angularjs10
kotlin10
asynchronous10
functional-programming10
polymorphism9
hapi9
rust9
Programming languages (7)
Github contributions (5)
jooohn/dog-eared
Feb 2020 - Jul 2020
Contributions:19 PRs, 126 pushes, 6 branches in 5 months
jooohn/dotfiles
Nov 2015 - Mar 2026
Contributions:17 pushes, 1 branch in 10 years 5 months
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