Leipzig
David Werth
Full Stack developer focused on building reliable, high-performance applications with TypeScript, Node.js and React. Experienced in taking features from idea to production, with a particular interest in backend systems, performance and scalability. Outside of work I like to dabble in 3D printing, soldering and embedded audio.
Projects & making
Software I ship in public, plus hardware I build at the bench.
Controlled grid layout builder for React. Drag, resize, restack, and compose sections on a responsive CSS grid. You bring the blocks; Vantage handles layout chrome, breakpoints, and the data model.
React, TypeScript, Vite, CSS Grid, dnd-kit
Real-time granular delay FX on the Electrosmith Daisy platform. An exploration of granular synthesis and embedded audio processing.
C++, CMake, Daisy
Printed, soldered, and built a Totem split keyboard in translucent green, then configured it with ZMK. (Yes, sometimes I wish I could just use a normal keyboard like a normal person)
3D printing, Soldering, ZMK
Open source
Contributions that shipped upstream.
- Graph ExplorerAmazon Web Services
Implemented a new data export feature alongside various other UI improvements.
- StyleXFacebook, Meta
Improved error detection and auto fixes for the ESLint plugin.
Work
Where I've been shipping day to day.
Stuzubi GmbHMunich, Germany
Full Stack DeveloperFeb. 2026 - Present
Junior Full Stack DeveloperFeb. 2024 - Feb. 2026
vystem Platform
- Took the lead on planning and implementing an event-operations job queue that coordinates mass guest emails, attachment generation, badge exports and imports through a shared, cancelable pipeline with realtime progress, so organizers can run heavy workloads without blocking the app.
- Optimized guest management for large events by refactoring registration queries, adding targeted indexes, and parallelizing frontend fetches, cutting guest-list load times from ~23 seconds to under 250ms.
- Designed and shipped a full license and usage-budget system for the platform, allowing customers and project managers to track video, streaming and email usage in a more transparent way.
- Leveraged AI tools to rebuild the internal legacy admin panel with Next.js and extended it with an operations dashboard for viewing platform and infrastructure stats in real time.
Stuzubi Core Products
- Improved job portal performance by implementing a CQRS-style read model, reducing page load times from ~7 seconds to under 1 second.
- Developed a production time-tracking PWA with Azure AD SSO, Personio HR synchronization and offline-resilient data synchronization via a SQLite outbox.
- Acquired technical ownership of the Stuzubi B2B platform and job portal, which are accessed by over 1,000 customers in the EU and over 60,000 German students per year, respectively.
Apple Inc.Barcelona, Spain
AIML Annotation AnalystAug. 2021 - Jan. 2024
- Analyzed and annotated large datasets to improve the accuracy and performance of machine learning algorithms.
- Evaluated responses for text and code generation of Apple's in-house AI, Apple Intelligence.
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