Valentin Zickner
Product Software Architect at Flowable
Zurich, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolValentin Zickner is a Product Software Architect with 13 years of experience building full-stack and backend systems, currently shaping product architecture at Flowable from Zurich. He combines startup instincts—having founded Querformatik—with enterprise-grade engineering honed across multiple roles at Mimacom and Flowable, and holds an M.Sc. in Informatics from KIT. Valentin contributes to notable open-source projects like Ghostfolio (Angular + NestJS full‑stack) and the Flowable engine, where his work spans frontend UX improvements to core Java engine fixes and dynamic context-root handling. Comfortable across TypeScript, Java and CI-driven workflows, he focuses on pragmatic performance optimizations and reliable integrations. Unusually, he is US-located on a company-sponsored visa but engages only as a contractor, reflecting a blend of international mobility and selective client engagement.
13 years of coding experience
18 years of employment as a software developer
Abitur (general qualification for university entrance) Information Technology, Abitur (general qualification for university entrance) Information Technology at Gottlieb Daimler Schule 1Master of Science (M.Sc.) Informatics, Master of Science (M.Sc.) Informatics at Karlsruhe Institute of Technology (KIT)thePower
German, English
Stackoverflow
341reputation
6kreached
16answers
0questions
Github Skills (29)
develop10
typescript10
workflow-engine10
io10
java10
javas10
bpmn10
typescript-types10
typescripts10
frontend10
backend10
web-frontend10
angular10
testing9
nestjs9
Programming languages (8)
Github contributions (5)
ghostfolio/ghostfolio
May 2021 - Dec 2021
Open Source Wealth Management Software. Angular + NestJS + Prisma + Nx + TypeScript 🤍
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:75 reviews, 69 commits, 25 PRs in 7 months
Contributions summary:Valentin primarily contributed to the frontend and backend development of the Ghostfolio wealth management software. Their work involved integrating Travis CI for automated testing, improving transaction filtering functionality with auto-completion, and optimizing order loading. The user also addressed UI/UX aspects by improving the user interface and maintaining active menu item states. Furthermore, the user refactored rule settings and implemented performance improvements for the portfolio calculator, including the calculation of net performance.
wealthtrackerstockfinancenestjs
flowable/flowable-engine
Jun 2018 - Dec 2021
A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 39 commits, 33 PRs in 3 years 7 months
Contributions summary:Valentin's contributions primarily involve modifying and improving the Flowable engine's internal logic. They addressed issues related to context root handling in the UI applications by modifying JavaScript configuration files and Java code. Key changes include improving regular expressions for application paths, implementing dynamic context roots, and fixing URL encoding in the HTTP activity executor. Furthermore, they modified various Java classes related to the core engine and UI components, demonstrating a focus on the back-end development of the workflow engine.
business-process-managementcompactprocess-managementworkflow-enginebpmn
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