Denis Rosca
Senior Scala Developer at SiriusXM
United Kingdom
Summary
👤
Senior🎓
Top SchoolDenis Rosca is a Senior Scala Developer with 11 years of experience building correct, scalable systems across fintech and consumer platforms, currently contributing at SiriusXM from the UK. He specializes in functional programming and Scala ecosystems, with hands-on experience shaping fraud-prevention systems at Deliveroo and high-throughput trading logic at Ullink where property-based testing and provable correctness were priorities. Denis is an active contributor to the influential typelevel/cats library, adding parallel traversal syntax and safety improvements that reflect his focus on robust abstractions. Comfortable working independently or in distributed teams, he brings strong communication skills and multilingual fluency in English, Romanian, and Russian. His background spans microservices, streaming, and cloud deployments, and he often blends category-theory-informed design with practical production constraints.
11 years of coding experience
11 years of employment as a software developer
Bachelor's degree, Information Technology, Bachelor's degree, Information Technology at Universitatea Tehnică a Moldovei
Romanian, Russian, English
Stackoverflow
71reputation
2kreached
1answer
0questions
Github Skills (8)
functional-programming10
monads10
typeclass10
scala10
parallel8
json6
php6
curl6
Programming languages (9)
Github contributions (5)
typelevel/cats
Mar 2018 - Nov 2019
Lightweight, modular, and extensible library for functional programming.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 commits, 12 PRs, 14 comments in 1 year 8 months
Contributions summary:Denis contributed to the `cats` library, focusing on adding new functionality and improving existing features related to functional programming concepts. Their work included adding `valueOrF` to `EitherT`, introducing a `Representable` instance for `Eval`, and implementing syntax extensions for parallel operations like `parTraverse_` and `parSequence_`. Furthermore, they added a `Compose` instance for `Map` and improved the stack safety of `MonoidK[Endo]`.
functional-programming
denisrosca/smithy4s
Jul 2023 - Jul 2026
https://disneystreaming.github.io/smithy4s/
Contributions:51 pushes, 11 branches in 3 years
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