Oleksandr K.

I build backend systems that handle video and media: stream recording and chunk assembly (MediaMTX), processing and transcoding (FFmpeg), S3-compatible storage (MinIO), and computer-vision pipelines (YOLO, audio speaker diarization). 20 years in backend development. Current stack: Node.js / TypeScript with NestJS, MikroORM and PostgreSQL; message-driven architectures on Apache Kafka and RabbitMQ. Earlier career: 12+ years of PHP and async/high-load systems, with a solid Linux and infrastructure background. What I can help you with: Backend services and REST APIs in Node.js / TypeScript (NestJS) Video/media pipelines: stream recording, chunk assembly into single files, transcoding, conversion, trimming (FFmpeg, MediaMTX, MinIO) Event-driven systems on Apache Kafka or RabbitMQ (including migrations between them) Integrating neural-network models into production services: object detection (YOLO), video analytics, audio speaker diarization Data layer on PostgreSQL / MySQL; user management and role-based access control (RBAC) Monorepo setup and package architecture for TypeScript projects Linux, Nginx, GitLab CI Based in Warsaw, Poland (CET). Comfortable with async, written communication. Languages: English (working proficiency), Russian and Ukrainian (native) — happy to work with teams that communicate in any of the three.