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ycaptain/README.md

ycaptain

TikTok  ·  Y Combinator startups  ·  Northeastern MSCS  ·  open to senior IC / founding-engineer roles, 2026

Senior software engineer and open-source author. I build the systems behind AI products: multi-model LLM orchestration, the clusters they run on, and the eval harnesses that keep them honest.

Core contributor to Modern.js, the React framework from TikTok's web-infrastructure org. Founding CTO, taking multi-model LLM products from zero to production. Now building open-source tools for AI engineering.

Open source

  • densa  ·  turns an Obsidian vault into agent-readable memory: typed AGENTS.md schema, validators, ingest & synthesis
  • agentctx  ·  ranks what's eating your AI coding context budget (MCP schemas, skill descriptions, CLAUDE.md)
  • aider-usage  ·  historical token & cost analytics for Aider, straight from local logs
  • Modern.js  ·  core contributor; the React framework open-sourced out of TikTok's web infrastructure

Tech

  • LLM systems: multi-model orchestration, cost-aware routing, RAG, evals & agent harnesses
  • Infra: Kubernetes / EKS clusters, Cloudflare Workers, Terraform, Postgres, Redis, async queues
  • Languages: TypeScript (native), Python, Go
  • App: React, Next.js, NestJS

Beyond OSS

Co-founder/CTO and product engineering on multi-model LLM platforms, real-time AI desktop apps, and YC startups (Antigen, Claybird). Specifics and history on LinkedIn.


Pinned Loading

  1. pmndrs/react-three-fiber pmndrs/react-three-fiber Public

    🇨🇭 A React renderer for Three.js

    TypeScript 31.8k 1.9k

  2. MrLesk/Backlog.md MrLesk/Backlog.md Public

    Backlog.md - A tool for managing project collaboration between humans and AI Agents in a git ecosystem

    TypeScript 6.6k 394

  3. web-infra-dev/modern.js web-infra-dev/modern.js Public

    A progressive web framework based on React and Rsbuild.

    TypeScript 5k 418

  4. densa densa Public

    Python

  5. agentctx agentctx Public

    TypeScript

  6. aider-usage aider-usage Public

    Offline token/cost usage reports from Aider analytics logs — like ccusage, but for Aider

    TypeScript


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