Jakub Janarek
Senior Software Engineer at Ki
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJakub Janarek is a senior software engineer based in London with 10 years of experience building reliable backend systems across Python, Go, Node and the Erlang/Elixir ecosystem. He’s held senior and tech lead roles at Lyst and recently completed a data-focused stint at Datamaran before moving through Wise and back into product roles, now at Ki. Jakub contributes to popular open-source projects—most notably improving Trio’s SSL/TLS robustness—illustrating a focus on correctness and fault-handling in async systems. Comfortable across data pipelines, CI/CD, and distributed systems, he pairs pragmatic engineering with a history of shipping production integrations and streamlining pipelines. Outside work he’s blended engineering with domain curiosity, from bank integrations and web scraping to tutoring and translation, reflecting a versatile problem-solving mindset.
10 years of coding experience
8 years of employment as a software developer
Bachillerato Modalidad de Ciencias Puras (Science Stream), Bachillerato Modalidad de Ciencias Puras (Science Stream) at Colegio La PurisimaUniversitat Politècnica de València
English, Spanish, Polish, German, Catalan
Github Skills (15)
ssl10
tls1210
structured-concurrency10
python10
tls1310
networking10
async10
pytest9
testing9
triplet9
triplestore9
tripledes9
error-handling9
triple9
async-await8
Programming languages (15)
Github contributions (5)
python-trio/trio
Oct 2018 - Oct 2018
Trio – a friendly Python library for async concurrency and I/O
Role in this project:
Back-end Developer
Back-end DeveloperContributions:15 commits, 1 PR, 7 comments in 6 days
Contributions summary:Jakub focused on improving the robustness of the Trio library's SSL/TLS implementation. They addressed exception handling, particularly when handshakes fail, and refined how methods are called before a handshake is established. Their work involved modifying exception handling within the `_core` and `_ssl` modules, adding new tests, and updating documentation. The changes included improvements to error handling and updating existing methods regarding the handshake process.
asyncconcurrencypythonasync-awaitnetworking
jxub/CryptoCompare
Sep 2017 - May 2021
App built with React.js, ES6, Yarn, and Material-UI that fetches data from crypto API's, with one-way data flow, functional components and promises :money_with_wings:
Contributions:19 commits, 13 PRs, 16 pushes in 3 years 8 months
cryptoapifunctional-componentsmaterial-uireactes6
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