Oleksii Retiznyk
Senior Software Engineer at illumin (AcuityAds Inc.)
Old Toronto, Ontario, Canada
Summary
👤
Senior🎓
Top SchoolOleksii Retiznyk is a Senior Software Engineer with a decade of hands-on experience delivering backend, DevOps and microservice cloud applications, currently driving engineering at illumin (AcuityAds) from Toronto. He has strong Java expertise—Spring Boot, Data, MVC and core Java—with extensive AWS practicum (ECS, Lambda, SQS, RDS, S3, CloudWatch/IAM) and a track record migrating monoliths to resilient microservices. As a technical lead at EPAM he boosted data delivery by 30%, introduced black-box monitoring for full production transparency, and applied deployment strategies that measurably improved reliability and predictability. He also built a Proof-of-Stake blockchain and web explorer as a freelancer, showing uncommon end-to-end system design across consensus, crypto primitives and low-latency search. Practical yet inquisitive, he blends hands-on optimization (native C integration, custom XA transactions) with team coaching to solve high-throughput, fault-tolerant challenges.
10 years of coding experience
6 years of employment as a software developer
Master's degree Computer Software Engineering, Master's degree Computer Software Engineering at National University of Kyiv-Mohyla Academy
Github Skills (6)
iteration3
java2
spring-boot2
minecraft1
automation1
react1
Programming languages (9)
Github contributions (5)
RetAlex/GenshinApp
Dec 2020 - Jan 2023
Web application for different GI purposes
Contributions:13 releases, 126 PRs, 168 pushes in 2 years 1 month
reactweb-applicationdocker
MathparLearningTeam/Jenkins
Mar 2020 - Nov 2020
Contributions:4 PRs, 49 pushes, 5 branches in 7 months
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