
Artem Kapustin
Innovative development that turns ideas into experiences
Kompetenzen

Meine Dienstleistungen


Portfolio
Arbeitserfahrung
Middle Full-Stack Developer
hrlbrass • Vollzeit
May 2024 - Jun 2025 • 1 yr 1 mo
Designed and shipped a two-level LLM agent service (FastAPI + GPT-o3 + GPT-4.1) with hierarchical knowledge base retrieval — first agent identifies relevant nodes, second generates cited responses — serving several thousand users with sub-2s median latency. Implemented function/tool calling patterns and strict structured JSON response schemas (Pydantic v2) for frontend integrations across 3 production AI products, including fallback logic and edge case handling that eliminated a class of silent runtime failures. Built real-time WebSocket pipelines using asyncio + Redis Pub/Sub, reliably handling 30+ concurrent data streams in production — zero message loss during high-load broadcasts. Automated CSV/tabular data ingestion with Pandas: normalised multi-source exports into a unified queryable model with validation and computed KPIs, replacing weekly manual reporting for a client's management team. Worked directly with clients on API contracts: scoped deliverables, proposed technical solutions, and delivered production-ready features with logging, observability, and error recovery.