Open Source | Nikolas Barwicki

Nikolas Barwicki

Product Engineer

Blog Projects Open Source

A coding agent built from scratch in the terminal — no frameworks, just TypeScript and LLM calls — to understand how tools like Claude Code actually work under the hood.

TypeScript LLM CLI

Production-grade RAG that goes beyond naive retrieval — hybrid search, LLM reranking, query reformulation, and explicit failure handling.

TypeScript Bun Vercel AI SDK PostgreSQL pgvector

Strict TypeScript starter optimized for AI-assisted development — five parallel checks on every commit so agents get instant feedback.

Bun TypeScript oxlint Knip Lefthook

Prompt evaluation workbench as an MCP server — run evals, compare providers, and test assertions directly from Claude Code.

TypeScript MCP Evals

Tech Radar Agents

Five AI agents collaborate to evaluate technology adoption decisions — no frameworks, just TypeScript, OpenAI SDK, and ~500 lines of code.

TypeScript OpenAI SDK

© 2026 • Nikolas Barwicki

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