Uladzislau Rybakou

• Fintech & KYC Integrations: Integrated core real-estate investment workflows with regulated financial providers (North Capital escrow/KYC, InvestReady accreditation, and Stripe payments), implementing webhook signature verification, idempotency keys, and compliance audit trails.
• AWS Cloud Infrastructure: Deployed and operated containerized Node.js backend workloads across AWS (ECS, Lambda, RDS, SQS), configuring queue-backed transaction processing and automated failure alerting.
• Full-Stack Product Delivery: Built investor onboarding flows, portfolio dashboards, and document signing interfaces in React backed by typed Node.js and PostgreSQL REST APIs.

• Monolith Refactoring: Decomposed legacy Node.js monolithic modules into modular, testable service layers with structured error handling and request validation while keeping production traffic uninterrupted.
• REST API & Database Optimization: Built and documented Node.js REST endpoints for internal and third-party consumers, optimizing slow SQL queries and database connection pooling.

• Streaming Infrastructure: Operated low-latency live video streaming pipelines (RTMP, HLS), media transcoders, and network relays for high-concurrency broadcast events.

Full-scale outdoor route-planning platform for cycling, running, and hiking with an interactive GIS map studio and a custom-built routing engine.

• Monorepo & Spatial Backend: Architected a TypeScript Turborepo workspace (Node.js 24, Hono, Drizzle ORM, React 19) backed by PostgreSQL with PostGIS spatial indexing, Redis caching, and Strava OAuth2 webhook synchronization on GCP Cloud Run.
• Custom Rust Routing Engine: Built a high-performance routing service in Rust (Axum, Tokio, memory-mapped OpenStreetMap PBF graphs, and DEM elevation tiles) for low-latency multi-modal pathfinding and surface analysis.
• Interactive GIS Workspace: Engineered a browser mapping studio using MapLibre GL, Zustand + Zundo temporal undo/redo state, client-side geometry processing, GPX pipelines, and interactive elevation and gradient profiling.

Production Telegram Mini App and bot for collaborative group expense splitting with zero-onboarding authentication and multimodal receipt recognition.

• Multimodal AI Receipt OCR: Built a Vision-Language Model (VLM) pipeline with strict JSON schema validation and arithmetic reconciliation that extracts receipt line items, taxes, and tips and translates dish names across 21 languages in a single inference pass.
• Real-Time Collaborative Sync: Engineered live multi-user item claiming over WebSockets with Redis Pub/Sub fanout, commutative state updates, and zero-onboarding Telegram WebApp HMAC-SHA256 (initData) authentication.
• Financial Ledger & Settlement: Designed a multi-currency ledger using exact NUMERIC arithmetic, proportional tax/tip distribution, FX rate caching, and automated peer-to-peer settlement calculation, deployed on GCP Cloud Run and Cloudflare via Terraform.

Autonomous AI news curation and broadcasting pipeline delivering filtered technical digests with Human-in-the-Loop editorial moderation.

• Semantic Deduplication Pipeline: Continuously polls 140+ technical and industry sources and eliminates cross-source duplicates in two stages: canonical URL SHA-256 hashing followed by PostgreSQL pgvector cosine distance checks (< 0.08 threshold across a 72h rolling window) using local bge-m3 embeddings.
• Two-Stage LLM Evaluation Funnel: Combines a lightweight triage scorer (grading technical substance 1-10 to reject marketing fluff) with full-text extraction and structured LLM synthesis into publication-ready digests.
• HITL Moderation & Concurrency: Dispatches drafts to editors via Telegram inline callbacks with atomic state transitions, quorum rules, and a scheduled broadcast engine using PostgreSQL SELECT ... FOR UPDATE SKIP LOCKED to prevent race conditions.