productAI product engineer
DoneBeforeYou
AI second brain with multi-agent RAG orchestration, Telegram bot integration, and hybrid semantic + BM25 search.
Multi-agent AI with hybrid semantic search
Next.jsMastraSupabasepgvectorTelegram
The problem
Personal knowledge tools become less useful when retrieval, conversation, and external channels behave as separate products.
What I built
- Built multi-agent orchestration, hybrid retrieval, streaming responses, Telegram integration, and per-user runtime resources with Mastra, Next.js, and pgvector.
Reliability and safeguards
- Added short-lived service authentication, per-user resource isolation, constant-time webhook-secret comparison, and container health checks.
Outcome
A functioning agent and retrieval product. It demonstrates application-layer AI depth, not model training or enterprise scale.