Jens Klingenberg - Senior Software Developer at Otto Group one.O

Jens Klingenberg

Senior Software Developer at Otto Group one.O

Hamburg, Germany

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Summary

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Rockstar

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Jens Klingenberg is a Senior Software Developer based in Hamburg with 11 years of experience building Android and Kotlin multiplatform solutions and currently contributing at Otto Group one.O. He is a passionate open-source maintainer—most notably enhancing Ktorfit, a KSP-based HTTP client generator for Kotlin Multiplatform—improving request handling, custom HTTP method support, and test coverage to smooth developer experience across Android, iOS, JS and native targets. Jens blends hands-on engineering with community education: he blogs about Android development, publishes OSS on GitHub, and enjoys teaching and sharing knowledge. His background spans product-focused roles at EDEKA DIGITAL and appmotion, and an applied computer science degree from FH Bielefeld, giving him a strong mix of commercial and academic grounding. Colleagues describe him as pragmatic and detail-oriented, with a knack for refactoring libraries to be more robust and ergonomic. Beyond code, he brings a user-centric mindset—building tools and documentation that help other developers move faster.

10 years of coding experience

6 years of employment as a software developer

Kaufmännischer Assistent für Wirtschaftsinformatik, Kaufmännischer Assistent für Wirtschaftsinformatik at BBS Pottgraben Osnabrück

Fachhochschulreife Informatik, Fachhochschulreife Informatik at Fachoberschule BBS Pottgraben

Industriekaufmann, Industriekaufmann at Höcker Polytechnik GmbH

Bachelor Wirtschaftsinformatik, Bachelor Wirtschaftsinformatik at FH Bielefeld

German, English

Github Skills (6)

kotlin10

http-client10

kotlin-multiplatform10

annotations10

annotation-processing10

testing9

Programming languages (11)

TypeScriptJavaCSSJavaScriptGoSassSwiftHTML

Github contributions (5)

Foso/Ktorfit

Apr 2022 - Jan 2023

HTTP client generator / KSP plugin for Kotlin Multiplatform (Android, iOS, Js, Jvm, Native, WasmJs)) using KSP and Ktor clients inspired by Retrofit https://foso.github.io/Ktorfit

Role in this project:

Back-end Developer

Contributions:45 releases, 58 reviews, 531 commits in 9 months

Contributions summary:Jens primarily focused on enhancing the Ktorfit library, a KSP plugin for Kotlin Multiplatform. Their contributions included refactoring code, adding features like custom HTTP method support and improvements to request handling (nullable fields). They also addressed bugs, fixed the double encoding of form parameters, and enhanced test coverage. These changes focused on improving the library's core functionality and developer experience.

retrofitkotlin-multiplatformandroid-jsios-nativeios

Foso/C-Crit_Generator

Sep 2019 - Nov 2021

A generator for your critical secret keys

Contributions:10 commits, 1 PR, 10 pushes in 2 years 2 months

golangcriticalsecret-keyssecuritykeys

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