Jan Szumiec
Research Collaborator
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolJan Szumiec is a seasoned software generalist and research collaborator with 15 years of experience building scalable services, developer tools, and hardware-integrated products across startups, public sector, and large tech firms. He has led engineering and product efforts from founding Ruby shops and SaaS platforms to managing teams at Knowde and senior engineering roles at Deliveroo and Indeed Flex, and now collaborates with the Oxford Internet Institute. Technically versatile, Jan has deep Rails and backend expertise—evidenced by contributions to the logstasher gem improving logging, request context, and ActionMailer integration—and a history of shipping resilient APIs and low-power embedded systems. He combines hands-on coding with architectural leadership, having modernised government services and authored Open Banking API standards for major UK banks. Notably entrepreneurial, he co-founded multiple ventures and led a hardware sensor product that ran on AA batteries for months, showing an unusual blend of software, hardware and product delivery. Based in Warsaw, he brings pragmatic problem-solving, cross-domain curiosity, and a talent for turning complex systems into reliable, testable software.
15 years of coding experience
19 years of employment as a software developer
Master of Science (M.Sc.), Computer Science, Master of Science (M.Sc.), Computer Science at Cracow University of Technology
Stackoverflow
51reputation
4kreached
3answers
1question
Github Skills (15)
ruby10
rspec10
ruby-rails10
rails10
actionmailer10
logging9
logstash9
json6
csv6
artificial-intelligence6
excel6
schema6
knn6
schematron6
java6
Programming languages (22)
Github contributions (5)
shadabahmed/logstasher
Jul 2014 - Oct 2015
Awesome rails logs
Role in this project:
Backend Developer
Backend DeveloperContributions:17 commits, 3 PRs, 3 pushes in 1 year 3 months
Contributions summary:Jan primarily focused on testing and improving the functionality of the logstasher gem. Their contributions involved fixing failing tests, adding new tests for specific scenarios like custom logger paths and ActionMailer integration, and ensuring the proper logging of email metadata. They added request context functionality, introducing a thread-safe dictionary for request-specific information, and made adjustments to accommodate changes to the Rails environment and dependencies.
railsrubylogginglogs
jasiek/docker-latex
Sep 2018 - Feb 2023
Contributions:22 pushes, 1 branch in 4 years 6 months
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