Stefan Dragnev
Senior Engineering Manager at Apryse
Bonn, North Rhine-Westphalia, Germany
Summary
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Rockstar🎓
Top SchoolStefan Dragnev is a Senior Engineering Manager based in Bonn with 12 years of experience leading machine learning, computer vision, and full-stack engineering teams. He progressed from hands-on computer vision development and ML leadership at Scanbot to senior management at Apryse, combining product-focused R&D with delivery ownership. Stefan has a strong engineering pedigree—contributions to high-profile open-source projects like OpenCV and work on build tooling for NativeScript demonstrate deep familiarity with vision pipelines, cross-platform builds, and CI/CD automation. He’s comfortable moving between low-level performance optimizations (JPEG/libjpeg-turbo, videoio fixes) and higher-level R&D strategy, and he often bridges research and production to ship robust features. An unconventional detail: despite formal university dropout entries, his career shows sustained technical leadership across startups and established teams, including leading game-engine subsystems early in his career.
12 years of coding experience
19 years of employment as a software developer
Dropout Informatics, Dropout Informatics at New Bulgarian UniversityDropout Computer Science, Dropout Computer Science at Sofia University St. Kliment Ohridski
English, Russian, Bulgarian, German
Stackoverflow
14,393reputation
1.3mreached
185answers
12questions
webpack
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dictionary
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concurrency
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javascript
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Github Skills (33)
unit-testing10
opencv10
javascript10
c-language10
npm10
image-processing10
travis-ci10
gruntjs10
computer-vision10
g10
cprogramming-language10
react10
cli10
ffmpeg9
multidimensional-arrays9
Programming languages (13)
Github contributions (5)
NativeScript/nativescript-cli
Jun 2014 - Nov 2015
Command-line interface for building NativeScript apps
Role in this project:
Automation Engineer / Build & Release Engineer
Automation Engineer / Build & Release EngineerContributions:6 releases, 33 commits, 12 PRs in 1 year 4 months
Contributions summary:Stefan's contributions primarily focused on configuring and improving the build and testing processes for the NativeScript CLI. They updated the Gruntfile to integrate with Travis CI, modified build numbers, and fixed issues related to package creation and installation. Additionally, the user added support for test framework dependencies and command execution for unit tests, demonstrating a focus on improving the development workflow.
nativescript-appsreact-nativecommand-line-interfacejavascriptandroid
opencv/opencv
Feb 2019 - Nov 2022
Open Source Computer Vision Library
Role in this project:Back-end Developer & Computer Vision Engineer
Back-end Developer & Computer Vision EngineerContributions:16 reviews, 6 commits, 10 PRs in 3 years 9 months
Contributions summary:Stefan made several contributions to the OpenCV library, primarily focusing on integrating and updating third-party dependencies. This included updating libpng and libtiff to newer versions and ensuring their compatibility. The user also corrected the direction of displaymatrix rotation within the videoio module and added support for orientation metadata in the AVFoundation backend. Furthermore, the user made build fixes for emscripten and optimized JPEG encoding using libjpeg-turbo built-in color conversions.
pythonvisiondeep-learningc-plus-pluscomputer-vision
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