Aleksander Kwiatkowski
Back End Developer at Reffine
Greater Poland Voivodeship
Summary
👤
Senior🎓
Top SchoolAleksander Kwiatkowski is a pragmatic back-end developer with about 15 years of production experience, specializing in Ruby/Rails, PostgreSQL, APIs and background processing (Sidekiq). He has a strong track record of performance tuning—fixing timeouts, reducing memory use and delivering 10–20x speedups for report generation—and migrating brittle JSONB “virtual models” into robust AR models. Comfortable across microservices, gRPC and high-test-coverage codebases, Aleksander also enjoys working with compiled languages (Crystal, Go, Rust, C++) and has been a GNU/Linux power user for two decades. He has held senior and lead roles at companies across Europe and brings practical experience from building high-traffic systems to adding operational reliability. Off the clock he pursues landscape photography, a hobby that complements his attention to detail and observant approach to problem solving.
15 years of coding experience
17 years of employment as a software developer
Master's degree Computer Engineering, Master's degree Computer Engineering at Poznan University of Technology
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (81)
programming-language10
esoteric-language10
bengali10
compiler10
stack-based10
middleware9
fundamentals9
api9
gpx9
language-design9
data-structures9
router9
youtube8
devise8
image-processing8
Programming languages (5)
Github contributions (5)
akwiatkowski/webcam_downloader
Jul 2015 - Jul 2021
Download webcams.
Contributions:1 PR, 4 pushes in 6 years 1 month
pythonwebcams
akwiatkowski/akwiatkowski.github.com
Jun 2015 - Jan 2023
Contributions:1254 commits, 520 pushes, 4 branches in 7 years 8 months
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