I'm Serhii Khalymon — a Senior Backend Engineer and Systems Designer with 10+ years of hands-on experience in Rust, Python, and distributed, cloud-native systems. I build things that scale, perform, and last.
🔭 Current Focus: consulting services via my company Fluxomnia s.r.o.
🛠 Recent Stack: Rust, Python, Axum, Diesel, FFmpeg, Docker, Selenium, GraphQL
🎓 Background: RTSLA @ KhAI • PTKiSumDU
🌍 Location: Slovakia (originally from Ukraine)
🌱 Learning: Language ergonomics in Rust • Slovak • humane systems design
💬 Ask me about: CI/CD for SDKs, video streaming, actor systems, self-hosted infrastructure
🤝 Available for: Collaborations on video, protocol, or OSS toolchains
📫 Reach me: serhii.khalymon@pm.me
Applitools (2018–Present) — Multi-Language SDK Lead
Python, Ruby SDKs • Visual testing • Selenium/Appium/Playwright integrations
Yalantis (2022–2023) — Rust Backend Engineer
GraphQL (async-graphql) • PostgreSQL/Diesel • Microservices • GitLab CI/CD
FundedByMe (2016–2018) — Backend Engineer
Django • PostgreSQL • AWS • REST API integrations
AmbienceData (2014–2016) — Full-Stack Engineer
Geospatial data pipelines • PostgreSQL/PostGIS • Celery/Redis
Languages: Python (7y, 2.7-3.12) • Ruby (2+y) • JavaScript/TypeScript • Rust (production)
SDK & Testing: pytest • RSpec • Selenium WebDriver • Appium • Playwright • RobotFramework • Cross-browser/mobile testing
Observability: Prometheus • Grafana • Jaeger • Loki • OpenTelemetry (OTLP) • Distributed tracing • Rust tracing framework
CI/CD: CircleCI • Travis CI • GitLab CI • GitHub Actions • Docker • Cross-platform builds (Linux/macOS/Windows)
Databases: PostgreSQL • PostGIS • Redis
Frameworks: Django • FastAPI • Axum • async-graphql • SvelteKit
Additional: GraphQL • AWS Lambda/RDS • Terraform • Ansible • Git (monorepo management)
Education:
- National Aerospace University (KhAI), Kharkiv — Computer Engineering (2012–2017)
- PTKiSumDU, Konotop — Computer Engineering (2008–2012)
Certifications:
- Coursera: DevOps, DataOps, MLOps
- Coursera: Object-Oriented Design
- INTUIT: Linux Administration
- CISCO: IoT (CNA)
“Clean code and clear conscience – I build both.”