Oleksandr Zeziulinskyi
Founder at HestiaX
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolOleksandr Zeziulinskyi is a founder and seasoned engineering leader based in Stockholm with 11 years of experience building resilient infrastructure across blockchain, DevOps, and embedded systems. He has led teams and scaled businesses from two-person startups to mature consultancies, and now focuses on capital markets infrastructure for renewable energy and green bonds at HestiaX. Technically hands-on, he contributed to adding EVM support and critical API fixes for the high-throughput Zilliqa blockchain and has deep experience in consensus-layer tooling and reliability engineering. His background spans low-level C++ and ASIC work—having built large bitcoin mining datacenters and programmed 16nm ASICs—to modern cloud IaC and observability stacks. Equally comfortable in product and platform roles, he combines entrepreneurship with a track record of shipping production-grade systems at scale. A pragmatic problem-solver, he often bridges cryptography, systems software, and financial infrastructure in unexpected ways.
11 years of coding experience
17 years of employment as a software developer
Master's degree, Computer Engineering, Master's degree, Computer Engineering at Sevastopol State Technical University
English, Russian, Ukrainian, Swedish
Stackoverflow
1,736reputation
2.2mreached
16answers
3questions
linux
top-5%
Github Skills (16)
json10
c-language10
cprogramming-language10
blockchain10
apidoc9
ethereum9
linux9
api9
boost8
wdk6
functional-programming6
driver6
javascript6
visual-studio6
patch6
Programming languages (7)
Github contributions (5)
Zilliqa/Zilliqa
Aug 2022 - Jan 2023
Zilliqa is the world's first high-throughput public blockchain platform - designed to scale to thousands of transactions per second.
Role in this project:
Backend Developer
Backend DeveloperContributions:23 commits in 4 months
Contributions summary:Oleksandr made several significant contributions to the Zilliqa blockchain platform. They fixed issues related to the `eth_getBlockByNumber` function, ensuring correct data formatting for compatibility with external tools like ethers-js. The user also implemented timestamp conversions and added block number and hash information to transaction objects for improved functionality. Further work involved refactoring and refining the codebase to enhance the retrieval of transaction details and receipts, ensuring the efficient operation of the blockchain's API.
blockchain-platformzilliqablockchainscalehigh-throughput
catchthatrabbit/coreminer
Nov 2020 - Oct 2022
Core C++ miner
Contributions:3 reviews, 88 commits, 11 PRs in 1 year 10 months
cppminer
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