Software Engineer · DeepL
All things document translation, vision models, AI Engineering and building agentic workflows. Member of DeepL AI Labs.
Berlin, Germany
Joshua Christl - About
Software Engineer based in Berlin
I build websites and complex products, end-to-end.
Backend, frontend, infrastructure, cloud - whatever it takes to ship. AI-first: building AI-powered products, and using AI to build faster.
Experience
QA Engineer · DeepL
Backend test automation. Owned the end-to-end test suite for document translation.
Founder / Engineer · Freelance
Built two SaaS web apps from scratch, solo - Python, FastAPI, React, AWS, Docker.
Software Engineer (working student) · CQSE GmbH
Core dev on Teamscale: static analysis, test-gap & test-impact analysis, clone detection, IDE plug-ins. Java, TypeScript, React.
Software Engineer (internships) · Klinikum rechts der Isar
Tools for dermatologists: image segmentation and classification. Python, Flask, TypeScript, Svelte.
Education
M.Sc. Computer Science · TUM
Engineering software-intensive systems, formal methods. Thesis: empirical study of manual classification & traceability of test gaps.
B.Sc. Computer Science · TUM
Thesis with Klinikum rechts der Isar: deep-learning outlier detection in dermatological images.
Publication
Outlier detection in dermatology: Performance of different convolutional neural networks for binary classification of inflammatory skin diseases
Benchmarking convolutional neural networks on binary classification of inflammatory skin diseases - a step toward reliable outlier detection in dermatological imaging. Grew out of my bachelor’s thesis with Klinikum rechts der Isar.
Blog mentions
How DeepL built better document translation
The story of raising the bar for document translation: turning customer feedback into metrics, metrics into benchmarks, and benchmarks into visibly better documents.
Inside DeepL’s journey to improving document translation
The engineering view: measurement-first development, benchmarks built from real-world PDFs, and the quality metrics behind layout-preserving translation.
Stack
I use whatever technology it takes to build. I love Java, Python, React and TypeScript but have also extensively programmed in C# and Go. I also like functional programming languages such as OCaml. Infra-wise, I work with AWS, Azure, Hetzner Cloud.