Vitalii Znak
Handshake / Open for hire

Handshake

I make complex systems legible — interactive explainers backed by production full-stack engineering.

In networking, a handshake is how two systems establish a trusted connection. Same idea here. Senior/lead full-stack engineer, 10+ years across real-time streaming, financial systems, and applied AI/ML — I don't list skills, I link to running proof of them, live on this site.

Zurich, SwitzerlandSwiss B permit · no sponsorship neededFull-time · Contract · Hybrid
SYNyou send a message
SYN-ACKI reply within 24h
ACKwe build something real
Proof, Not Claims
Interactive visualization engineering

SolidJS fine-grained reactivity, three.js, chart.js, d3 — 90+ hand-built visualization components.

Drag the weights, watch the error surface move →
Machine learning fundamentals

Gradient descent, activation functions, decision boundaries — explained from first principles, interactively.

Interactive neural-network explainer →
Making hard topics legible

Cryptographic key exchange taught through hands-on modular arithmetic, not hand-waving.

Diffie-Hellman, interactive →
Full-stack production engineering

TypeScript, Node.js, Python, PostgreSQL, GraphQL, Docker, Kubernetes, AWS — 10+ years shipping across real-time streaming, fintech, and applied AI.

GitHub →
Track Record
Solar-yield simulation + computer-vision rooftop analysis (Segment Anything) at enshift AG
Zurich · 2025–26
DRM inside WebRTC with the castLabs team at Phenix — the PoC became a public partnership
real-time streaming
Commodity-trading & KYC platforms at Komgo
fintech · Geneva
This site: 90+ interactive visualization components, hand-built on SolidJS + three.js + chart.js
live above ↑
~100,000 concurrent viewers sustained on a video-streaming platform
performance
Founder & CTO of VsComments · 1st-place hackathon '17 — built “Not Hotdog” solo
zero-to-market

English (fluent) · Ukrainian (native) · Portuguese (fluent) · German (A2)

The full chronological history lives in the CV — grab it above.