Damjan Ostrelic
System Engineer at Cloudflare
Lisbon, Portugal
Summary
🤩
Rockstar🎓
Top SchoolDamjan Ostrelic is a senior system engineer with 11 years of cross-domain experience building scalable backend systems, currently working on Cloudflare’s browser rendering and tag/CDN products from Lisbon. He’s shipped real-time media AI ingestion and augmentation pipelines at YLD, led a global team to build a decentralised Cardano API at Koios, and has strong operational instincts—authoring Bash tooling, Terraform infrastructure for 1500+ resources, and CI/CD workflows. Comfortable in Python and TypeScript (React) with production experience in Java, PHP and Postgres, he’s actively curious about Go and functional languages like Haskell and Scala. An open-source-minded operator, he’s contributed DevOps and backend improvements to the prominent cardano-community guild-operators repo, adding RPC endpoints and asset registry integrations. His background in geoscience research underpins a pragmatic, data-driven approach to complex system design and failure-resilient engineering.
10 years of coding experience
6 years of employment as a software developer
Bachelor’s Degree, Geological/Geophysical Engineering, 4.5 on 5.0 scale, Bachelor’s Degree, Geological/Geophysical Engineering, 4.5 on 5.0 scale at University of Zagreb / Faculty of Mining, Geology and Petroleum engineeringDoctor of Philosophy - PhD (Unfinished), Geological and Earth Sciences/Geosciences, Doctor of Philosophy - PhD (Unfinished), Geological and Earth Sciences/Geosciences at University of LeedsMaster’s Degree, Geology of Mineral Resources and Geophysical Explorations, Master’s Degree, Geology of Mineral Resources and Geophysical Explorations at University of Zagreb/Sveuciliste u Zagrebu
English, French, Croatian, Portuguese
Stackoverflow
922reputation
36kreached
52answers
6questions
Github Skills (23)
scripting10
script10
cardano10
blockchain10
sh10
shell10
postgresql9
devops9
apidoc8
api8
bash7
html6
githubaction-workflow6
haskell6
api-documentation6
Programming languages (14)
Github contributions (5)
cardano-community/guild-operators
Jul 2020 - Oct 2022
Artifacts and scripts created by Guild operators
Role in this project:
DevOps Engineer & Backend Developer
DevOps Engineer & Backend DeveloperContributions:141 reviews, 184 commits, 152 PRs in 2 years 3 months
Contributions summary:Damjan primarily contributed to the project by modifying shell scripts related to Cardano node operation and tooling. Their work included updating scripts to check for and manage updates to the CNTools script, adding support for multiple pool owners, and enhancing gLiveView with peer analysis features. Furthermore, the user was also involved in adding new features related to integrating a local token registry for assets and creating new RPC endpoints to manage chain data.
adatestnet-detailsgliveviewblockchainkoios
dostrelith678/cardano-leader-logs
Oct 2020 - Jan 2023
NodeJS+Python implementation for calculating a pool's block schedule.
Contributions:5 reviews, 63 commits, 26 PRs in 2 years 3 months
pythonpython-implementationpoolnodejsnodejs-python
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