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Location: Brazil (UTC-3) Remote: Yes (remote only, US/EUR timezone overlap) Willing to relocate: No Technologies: Node.js/NestJS/TypeScript, React, PostgreSQL, Redis, RabbitMQ, Docker, AWS/GCP, Rust (Tokio, Axum, Tonic, WASM)

Résumé/CV: https://www.ovasylenko.com Email: hello@ovasylenko.com

Backend & systems engineer, 18+ years.

Three recent builds: g6k-rs lattice reduction engine supports CPU/Metal/GPU with all contemporary algorithms: LLL, BKZ, Sieving, DeepLLL, Seysen etc with arbitary precision

Rust — Solo-built Orch8 (orch8.io), a durable workflow orchestration engine. 2,400+ instances/sec, <3ms latency. 7 crates, 3 SDKs (Node/Python/Go), 200+ integrations, built-in LLM tool calling and ReAct agent loops. Node.js/NestJS — Matching engine for a crypto exchange processing 4,000+ orders/sec with sub-millisecond latency. Liquidity bots, candle engine, real-time WebSocket trading.

Looking for: Backend/Fullstack developer/Tech lead (Node.js or Rust), Web3/protocol engineering, or AI infrastructure roles. I care about product ownership and shipping - not process theater.

Open to b2b contracts