Maciej Kołek
Principal Mobile Engineer (iOS Android) at Freelance work
Gdańsk, Pomeranian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMaciej Kołek is a Principal Mobile Engineer with over 11 years of experience building high-quality iOS and cross-platform mobile apps, currently driving mobile engineering at Splunk. He combines deep native iOS expertise—Touch ID/Face ID, rich notifications, Swift/Objective-C—with a pragmatic focus on app architecture, reducing technical debt and improving UX. As a founder of a high-traffic Rails marketplace (550k+ users) and frequent contributor to open-source Swift and backend projects, he bridges product, backend and mobile concerns effectively. He has led and mentored teams as an iOS Tech Lead at Volvo, shaping roadmaps and delivery for mission-critical apps. Ambitious to move further into tech leadership, he pairs hands-on coding with workshops and public speaking on UI/UX best practices. Off-hours he’s an internationally published esports photographer, bringing a practiced eye for capturing user-facing moments and product polish.
11 years of coding experience
13 years of employment as a software developer
Bachelor’s Degree, Computer Science, Bachelor’s Degree, Computer Science at University of Gdansk
English, German, Polish
Stackoverflow
346reputation
7kreached
16answers
2questions
Github Skills (28)
json10
json-parser10
redis10
rspec10
jsonp10
work-flow10
data-structure10
ruby10
workflow-automation10
parsing10
data-structures10
swift10
unit-testing9
worker-process8
queue8
Programming languages (5)
Github contributions (5)
haidalinda/Gloss
Oct 2016 - Nov 2016
[Deprecated] A shiny JSON parsing library in Swift :sparkles: Loved by many from 2015-2021
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 3 PRs, 12 comments in 1 month
Contributions summary:Maciej appears to be focused on enhancing the functionality of the JSON parsing library, "Gloss", written in Swift. They have made code improvements within the `Decoder` and `Encoder` structs, indicating contributions to both the decoding and encoding aspects of JSON handling. The commits also include code reviews and modifications to the `Dictionary` extension, further suggesting a focus on core data structures and parsing logic. The addition of UUID support also points toward enhanced capabilities.
parsingswiftjsonjson-parsing
chaps-io/gush
Nov 2015 - Nov 2015
Fast and distributed workflow runner using ActiveJob and Redis
Role in this project:Back-end Developer
Back-end DeveloperContributions:11 commits, 2 PRs, 23 comments in 1 day
Contributions summary:Maciej contributed to the core logic and structure of the `gush` project. They implemented unique job and workflow ID generation, enhanced job persistence with the Redis database, and refactored how jobs are queued by utilizing job names instead of classes. Furthermore, they wrote and updated tests for workflow functionality. The user also worked on payload handling and dependency resolution within the workflow.
redisworkflowsrubysidekiqgraph
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