Marcel Haupenthal
Backend Software Engineer at HORNBACH Baumarkt AG
Neustadt an der Weinstraße, Rhineland-Palatinate, Germany
Summary
👤
Senior🎓
Top SchoolMarcel Haupenthal is a backend software engineer with nine years of experience building high-traffic web and mobile platforms across e-commerce and consumer apps. He has driven performance and scalability gains—improving TTFB, Time to Interactive, and SEO—while architecting GraphQL proxies, CI/CD pipelines, and migrations to cloud-native backends. Marcel has repeatedly shipped features used by millions (HORNBACH customer app and portals) and optimized the data-fetching and deployment surfaces for startups like CASHY. Comfortable across Node.js/TypeScript stacks (Next.js, NestJS), Redis, MongoDB and AWS, he blends hands-on engineering with technical leadership, having served as tech lead on major app rewrites. Based in Neustadt an der Weinstraße, Germany, he pairs a Wirtschaftsinformatik degree with a pragmatic focus on observability and measurable user-facing improvements—often finding wins in routing and data-layer design that aren’t obvious from UI-level work.
9 years of coding experience
1 year of employment as a software developer
Bachelor of Science - BS Wirtschaftsinformatik, Bachelor of Science - BS Wirtschaftsinformatik at Baden-Wuerttemberg Cooperative State University (DHBW)
Stackoverflow
287reputation
39kreached
12answers
3questions
Github Skills (189)
graphql-request10
hybrid10
javascript10
boltdb10
browser10
prompt10
redux-devtools-extension10
inquirer10
api10
compiler10
cli10
json10
static-site-generator10
typescript10
urql10
Programming languages (9)
Github contributions (5)
marhaupe/json2struct
Nov 2018 - Dec 2022
CLI tool to convert JSON to struct type definitions
Contributions:17 releases, 261 commits, 11 PRs in 4 years 1 month
golangkebab-casestructsgocli-tool
marhaupe/qmk_firmware
Apr 2020 - Sep 2022
Open-source keyboard firmware for Atmel AVR and Arm USB families
Contributions:21 pushes, 1 branch in 2 years 4 months
rp2040firmwareavratmelusb
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