Luka Jacobowitz
Senior Staff Software Engineer at SiriusXM
New York, New York, United States
Summary
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Rockstar🎓
Top SchoolLuka Jacobowitz is a Senior Staff Software Engineer based in New York with 11 years of experience building robust backend systems and leading engineering teams. He has deep expertise in Scala and functional programming, demonstrated by substantive contributions to prominent Typelevel projects like fs2 (file I/O and TCP socket enhancements) and cats (new typeclass implementations and traversal utilities). Luka has progressed from hands-on mobile and full-stack engineering to technical leadership roles at CompStak and SiriusXM, shipping streaming, high-throughput systems and mentoring teams. He blends pragmatic system design with strong testing and documentation practices, often introducing new functionality alongside comprehensive tests. Notably, he has run workshops and led small teams to deliver internal tools and observability systems that handle millions of events per second. His background—MSc in computer science and cross-disciplinary experience from mobile to APM tooling—gives him a rare mix of production-grade engineering and functional-programming rigor.
11 years of coding experience
11 years of employment as a software developer
Master of Science - MS, Master of Science - MS at Düsseldorf University of Applied SciencesAbitur Physics English, Abitur Physics English at Carl Friedrich von Weizsäcker-Gymnasium
English, German
Stackoverflow
23,163reputation
1.2mreached
266answers
3questions
json
top-1%
rxjs
top-5%
swift
top-5%
typescript
top-1%
observable
top-1%
scala
top-5%
Github Skills (32)
kotlin10
json10
javascript10
typeclass10
testing10
typescript10
data-structure10
scala10
stream10
observable10
fileio10
file-handling10
file-processing10
data-structures10
cat10
Programming languages (14)
Github contributions (5)
typelevel/cats
Jul 2019 - May 2022
Lightweight, modular, and extensible library for functional programming.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 114 reviews, 39 commits in 2 years 10 months
Contributions summary:Luka contributed to the `cats` library by migrating to a new kind-projector symbol. The commits reflect the addition of the `Align` typeclass with implementations for various data structures, including `List`, `SortedMap`, and `NonEmptyList`. They also added the `traverseEither` function. Furthermore, the user added and updated test suites. The changes demonstrate expertise in functional programming and the Cats library's design.
functional-programming
typelevel/fs2
Jul 2019 - May 2020
Compositional, streaming I/O library for Scala
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits, 5 PRs, 4 pushes in 10 months
Contributions summary:Luka contributed new file I/O operations and implemented functionality for file system interactions, including `directoryStream`, `walk`, `exists`, `copy`, `delete`, `size`, `move`, `createDirectory`, and `createDirectories`. They also introduced tests and documentation for these file-related functionalities. Furthermore, the user integrated additional socket options in the TCP module.
scalastreamstreaming-computationfpfunctional-programming
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