Krzysztof Rybka
@krzysztofrybka
Senior Software Engineer at Deliveroo who contributed to high-volume Consumer Checkout and created 1,000+ pull requests.
MexicoWhat I'm looking for
At Deliveroo, I contributed backend and web code to a new cross-platform Consumer Checkout, a high-volume production system. I worked across Go, Ruby, TypeScript, and React, and created 1,000+ pull requests during my engagement.
At Authorea, I modernized a mature Ruby and JavaScript codebase, fixed hundreds of bugs, and added functionality for scientific-paper peer review and DOI versioning. I’m open to part-time, contract, and remote opportunities.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
Deliveroo
Nov 2020 - Jun 2026 (5 years 7 months)
Learned Go to contribute to a production microservice serving 100% of checkout page views and handling order placement. Led delivery of a new cross-platform Consumer Checkout and coordinated multiple streams of work.
Senior Ruby on Rails & React Developer
Authorea
Jun 2019 - Nov 2020 (1 year 5 months)
Modernised a mature Ruby and JavaScript codebase, fixed hundreds of bugs, and improved performance through caching and reducing JavaScript bundle size. Created new functionality including scientific-paper peer review and DOI versioning.
Ruby on Rails Developer
Viewcy
Jun 2019 - Oct 2019 (4 months)
Improved site speed, implemented search for events, users and organisations, fixed bugs, and improved SEO.
Ruby on Rails & React Developer
Saleskick AB
Dec 2017 - Apr 2019 (1 year 4 months)
Developed React/ES6 frontend and Ruby on Rails backend applications. Integrated Twilio, Stripe and Pipedrive webhooks and delivered new features with extensive refactoring.
Ruby on Rails & React Developer
Spark Solutions
Jul 2015 - Oct 2017 (2 years 3 months)
Built and launched e-commerce projects using Ruby on Rails, React and Elasticsearch. Mentored junior developers and acted as a technical/team lead.
Junior Ruby on Rails Developer
Arena.pl
Feb 2015 - Apr 2015 (2 months)
Developed the Arena.pl sales portal using Ruby on Rails, Spree, ReactJS, CoffeeScript, Bootstrap and HTML.
.NET & C# Developer
Freelancer
Jan 2013 - Nov 2014 (1 year 10 months)
Developed applications using C#, .NET and MSSQL Server, including library and archival document-management systems.
Education
Degrees, certifications, and relevant coursework
Electronic Technical School No. 1
2009 - 2013
Attended Electronic Technical School No. 1 in Warsaw, Poland from 2009 to 2013.
Tech stack
Software and tools used professionally
Availability
Location
MexicoAuthorized to work in
Salary expectations
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