Tymoteusz Dzienniak
Principal Software Engineer at Pracownia Kodu
Katowice, Silesian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolTymoteusz Dzienniak is a Principal Software Engineer based in Katowice with 13 years of hands-on experience building full-stack systems, leading teams, and shaping architecture across startups and product companies. He blends deep Node.js and TypeScript backend expertise with React front-end work, infrastructure-as-code (Terraform), and production container deployments on AWS. As an engineer-leader he has driven company-wide quality initiatives, led guilds inspired by software craftsmanship, and delivered niche solutions like a real-time audio-fingerprinting ad-replacement system. He contributes to notable open-source projects—improving Rasa’s stability and extending test coverage for the popular qs querystring parser—showing attention to robustness and edge-case behavior. Founder of Pracownia Kodu and an experienced architect, he favors modular monoliths and reliable async patterns (transactional outbox, retries with backoff) for distributed messaging. Colleagues describe him as a pragmatic problem-solver who pairs hands-on coding with mentoring and long-term maintainability.
13 years of coding experience
10 years of employment as a software developer
Computer Science, Computer Science at Jagiellonian University
Polish, English
Stackoverflow
46reputation
637reached
2answers
0questions
Github Skills (14)
machine-learning10
nodejs10
javascript10
nlp10
rasa10
python10
parse10
test-automation10
testing10
conversational-ai9
backend9
bot-framework9
paperjs6
grouping6
Programming languages (11)
Github contributions (5)
RasaHQ/rasa
Jul 2018 - Jun 2019
💬 Open source machine learning framework to automate text- and voice-based conversations: NLU, dialogue management, connect to Slack, Facebook, and more - Create chatbots and voice assistants
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 commits, 7 comments, 8 issues in 10 months
Contributions summary:Tymoteusz made several contributions focused on improving the functionality and stability of the Rasa framework. These changes include allowing unicode characters in extracted entity values, reloading the model with domain updates, and using existing endpoints configuration. The user also updated the CHANGELOG and performed code formatting, indicating a focus on maintaining the project's quality and usability. These changes suggest a strong understanding of the Rasa framework's core components.
nlupythonbotspeech-recognitionbotkit
ljharb/qs
Feb 2016 - Feb 2016
A querystring parser with nesting support
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:6 commits, 1 PR, 7 comments in 2 days
Contributions summary:Tymoteusz's contributions primarily focus on enhancing the test suite for the `qs` library, a querystring parser. They added test cases to cover edge cases related to compacting nested arrays, including multidimensional arrays and mixed nested objects and arrays. These additions improve the robustness of the library by ensuring correct parsing behavior for complex querystring structures.
nestingstringifybrowsersjavascriptquerystrings
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