Jozef Slezák
Chief Technology Officer at iteria.io
Slovakia
Summary
👤
Senior🎓
Top SchoolJozef Slezák is a pragmatic CTO and systems architect with nine years of documented experience and over a decade in Java development, specializing in designing, integrating and operating complex backend systems across Telco, Networking, Transport, Public and Gas sectors. He has led teams up to eight engineers through full project lifecycles—presales, estimation, milestones, code reviews, acceptance tests and L3 production support—while moving between greenfield builds and extending legacy platforms. Recent work focuses on SDN and cloud/datacenter use cases, building high-performance data planes and service-oriented control planes using Java and Go, Docker/Kubernetes, ETCD, Kafka and RAFT clustering. Comfortable both as a hands-on developer and a technical leader, he bridges customer-facing communication with low-level engineering, including fd.io and VNF integrations for international clients. Known for pragmatic system-integration thinking, he often defines third-party interfaces and runbooks that prevent brittle production handoffs. Based in Slovakia with an academic background in software engineering, he combines deep backend craftsmanship with practical R&D outcomes.
9 years of coding experience
16 years of employment as a software developer
Bachelor of Engineering (BEng), Informatics, Master of Engineering (MEng), Software Engineering, Bachelor of Engineering (BEng), Informatics, Master of Engineering (MEng), Software Engineering at Slovenská technická univerzita v Bratislave
Github Skills (200)
graphql-api10
hashicorp10
api10
trigger10
vault10
bigquery10
react-router10
zeplin10
mongodb10
webhooks10
subgraph10
refactor10
rest-api10
haskell10
scale10
Programming languages (11)
Github contributions (5)
iteria-app/lowcode
Aug 2020 - Aug 2021
React Lowcode - prototype, develop and maintain internal apps easier
Contributions:7 releases, 295 reviews, 144 commits in 1 year
code-generationastprototypegeneratorgrommet
iteria-app/s3-graphql
Feb 2022 - Dec 2022
Multipart Uploads - Apollo Server wrapping S3 API (useful for Hasura Remote Schema)
Contributions:14 reviews, 12 PRs, 14 pushes in 10 months
apihasuramultipart-uploadshasura-remote-schemawrapping
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