Marcel Holter
Head Of Engineering at Wolt
Espoo, Finland
Summary
👤
Senior🎓
Top SchoolMarcel Holter is a seasoned engineering leader with 11 years of experience building and scaling consumer-facing client platforms, currently Head of Engineering at Wolt in Espoo. He combines hands-on Kotlin backend experience and a pragmatic focus on code quality—evidenced by contributions to the prominent Arrow functional library—with strong people and platform leadership across mobile, web, QA and staff engineering. Marcel has progressed from Android developer to engineering manager and now leads cross-disciplinary teams to enable autonomous delivery and ownership of Wolt’s consumer applications. Known for careful refactoring and improving maintainability, he balances architectural thinking with day-to-day operational excellence.
11 years of coding experience
10 years of employment as a software developer
Media Informatics, Media Informatics at Cologne University of Applied SciencesGeneral certificate of secondary education, General certificate of secondary education at Irmgardis-GymnasiumGeneral qualification for university entrance, Mathematics, General qualification for university entrance, Mathematics at Friedrich-Wilhelm-Gymnasium
English, German
Stackoverflow
825reputation
66kreached
14answers
4questions
Github Skills (22)
kotlin10
arrow-keys10
refactor10
functional-programming10
refactoring10
arrows10
arrow-js10
typeclass9
monads9
data-structures8
data-structure8
unit-testing7
retrofit6
android-studio6
gson6
Programming languages (6)
Github contributions (5)
arrow-kt/arrow
Sep 2017 - Sep 2017
Λrrow - The perfect companion for your Kotlin journey - Inspired by functional, data-oriented and concurrent programming
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 2 PRs, 2 comments in 3 days
Contributions summary:Marcel primarily focused on refactoring and improving the codebase, as evidenced by the code style changes. They renamed functions, formatted code for style compliance, and removed redundant tests, indicating a focus on code maintainability and quality. The user also contributed to the implementation of utility functions like 'merge' and 'parallel' for various data structures within the Arrow project. The commits reveal familiarity with Kotlin and the functional programming paradigm in this library.
kotlin-dslfunctional-programmingtypeclassesarrowfor-comprehension
anstaendig/ArchitectureComponents
Jun 2017 - Nov 2017
Contributions:19 commits, 24 PRs, 42 pushes in 5 months
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