Igor Roslik

I’m a full-stack engineer (TypeScript, Node.js, React) with 4 years of experience building multi-tenant B2B SaaS end to end. At Sunmait Tech, I’ve delivered three product projects in parallel, owning full-stack development across UI and backend.

My recent focus is production LLM engineering. I cut the cost of repeated LLM calls by ~10–15% with Vertex AI context caching (TTL management and cached-token accounting), and I built an LLM reliability layer with malformed-JSON recovery, provider fallbacks, circuit breakers, and failure-metadata logging.

In parallel, I developed end-to-end semantic vector search over a ~500k-item catalog using sentence-transformer embeddings and an OpenSearch kNN index, plus a hybrid neural query with fuzzy-match fallback. I also built the call-scoring pipeline with prompt versioning/overrides, scoring-calibration cycles, scoring-field normalization, and re-analysis tooling.

Earlier work grounded my systems thinking in real business workflows: I led e-commerce order lifecycle and fulfillment (12k+ orders/month), subscription billing on Chargebee, and automated supplier payouts processing $10M+. I also built scalable integrations across Shopify and WooCommerce, including inventory sync, debounced webhook handling, and async RabbitMQ pipelines.