Vlad Ilyushchenko
Co-Founder, Chief Technology Officer at QuestDB
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolVlad Ilyushchenko is a pragmatic, hands-on CTO and co-founder with 12+ years building low-latency, high-availability systems and a deep specialty in zero-GC Java, off-heap memory and network protocol/socket programming. He leads engineering at QuestDB, an open-source high-performance time-series database, where he contributes to SQL subsystem fixes, metadata and storage improvements and performance-oriented backend work. His background spans quant finance and crypto infrastructure—low-latency FX pricing and cash equities at major banks and platform engineering at Blockchain.com—bringing production-grade rigor to distributed data systems. Vlad combines systems-level engineering with product sensibility, focusing on delivery, operational robustness and developer experience. He holds a master’s in applied mathematics and completed Y Combinator as part of QuestDB’s founder journey, reflecting both strong analytical foundations and startup traction. Colleagues know him for tackling the gritty concurrency and memory problems others avoid, and for building teams and tooling that scale.
12 years of coding experience
12 years of employment as a software developer
Y CombinatorMaster's degree Applied Mathematics, Master's degree Applied Mathematics at V. N. Karazin Kharkiv National University
Russian, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (12)
databases10
c-language10
cprogramming-language10
sql10
back-end-development10
relational-databases10
database-design10
sql-database10
database10
computer-engineering9
performance-tuning9
testing8
Programming languages (15)
Github contributions (5)
questdb/questdb
Apr 2014 - Jan 2023
QuestDB is a high performance, open-source, time-series database
Role in this project:
Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:75 releases, 3049 reviews, 2756 commits in 8 years 10 months
Contributions summary:Vlad primarily contributed to bug fixes within the SQL subsystem of QuestDB, addressing inverted behavior in int-to-boolean casts and resolving transaction failures in simple query mode. They also improved the code for logging and database operations. Furthermore, the user worked on data storage and access, addressing issues in metadata handling, and implemented features to improve performance.
simdfinancial-analysisgrafanatime-seriestsdb
questdb/questdb-kubernetes
May 2021 - Jan 2023
Configuration to run QuestDB in your Kubernetes cluster
Contributions:32 reviews, 45 commits, 163 PRs in 1 year 8 months
k8skuberneteskubernetes-clusterclusterquestdb
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