Software Engineer · IEEE Senior Member · Los Angeles, CA
I build mobile AI systems — from on-device ML inference to SDK architectures serving millions of users.
- Disfluo — On-device speech disfluency detection & voice stress analysis framework for iOS. CNN models running in <1ms via CoreML. Paper under review at IEEE Signal Processing Letters.
- Secret Project — GenAI-powered agentic features for the App.
| Project | Role | Impact |
|---|---|---|
| Solitaire | Co-Creator & Lead Dev | 10M+ downloads, 200K DAU, $8M+ revenue |
| Appodeal SDK | Founding Engineer | Unity SDK powering 80% of company revenue; company grew to 300+ employees |
| SeaGreen (Datasya) | Head of Mobile | 10x inference improvement, real-time respiratory monitoring, contributed to $3M seed |
| TFLiteMovement | Creator | Open-source TensorFlow Lite pose detection on iOS/SwiftUI |
- N. Kozak, "On-Device Disfluency Detection with Voice Stress Association Analysis: A Mobile Framework Validated on SEP-28K," submitted to IEEE Signal Processing Letters, 2026.
- N. Kozak, "Dynamic Multidex Loading for Cross-Platform SDK Integration," Zenodo, 2026. DOI: 10.5281/zenodo.19197878
Swift SwiftUI CoreML PyTorch Python Accelerate/vDSP ARKit Metal React Native Flutter Unity
ORCID · IEEE · Toptal · nzrkzk@gmail.com





