Mateusz Sękara
Senior Software Engineer at Chainlink Labs
Krakow, Lesser Poland Voivodeship
Summary
🤩
Rockstar🎓
Top SchoolMateusz Sękara is a Senior Software Engineer with 11 years of hands-on experience building scalable, highly available backend systems on the JVM while comfortably spanning frontend, DevOps, and infrastructure work. He has driven platform-wide improvements at Zendesk—standardizing Java versions, reducing security vulnerabilities, and leading migrations to containerized deployments—while also delivering product-facing integrations that materially increased traffic and user value. At Chainlink Labs he contributed performance and observability improvements to a major open-source oracle node project, including DB indexing that sped up critical log polling queries. Mateusz blends deep backend optimization skills (databases, distributed systems, queuing) with practical full-stack delivery, and he’s actively exploring Elixir and blockchain tech to broaden his toolkit. Based in Krakow, he’s known for taking ownership across the stack and turning operational pain points into lasting, documented practices.
10 years of coding experience
8 years of employment as a software developer
AGH University
Polish, English
Github Skills (8)
go10
prometheus10
postgresql10
database-optimization10
blockchain9
oracles9
golang9
oracle9
Programming languages (4)
Github contributions (5)
smartcontractkit/chainlink
May 2023 - Apr 2025
node of the decentralized oracle network, bridging on and off-chain computation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:443 reviews, 193 PRs, 546 pushes in 1 year 11 months
Contributions summary:Mateusz's contributions focused on enhancing the performance of the Log Poller, specifically improving query execution within the `smartcontractkit/chainlink` repository. Their work involved adding observability metrics to track query durations and dataset sizes within the Log Poller. They also implemented new functionality and optimized existing database interactions. Additionally, the user introduced indexing on the `evm_log_poller_blocks` table to speed up subqueries execution, demonstrating expertise in database optimization.
golangcomputationethereumblockchaindecentralized
zendesk/zendesk-sell-for-zapier
Mar 2019 - Feb 2021
Zendesk Sell Application written for Zapier Platform
Contributions:18 reviews, 21 commits, 31 PRs in 1 year 11 months
phpzendeskzapier-cli-appzapiersell
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