Hey, I'm Lenvin

I'm a Senior Engineer at Fleek (YC W22), where I build production AI systems -- multi-agent pipelines, internal developer platforms, and full-stack product infrastructure.

Over 6 years I've shipped across the full stack:

  • Multi-agent AI systems with LangGraph, LangChain, OpenAI & Claude
  • Internal developer platforms using MCP architecture (Model Context Protocol)
  • Serverless backend with TypeScript, Node.js, AWS Lambda, SQS/SNS, SST
  • APIs with GraphQL (Apollo Server), PostgreSQL (Kysely), Redis, OpenSearch
  • React Native mobile apps (two production apps) and Next.js web
  • AI grading pipelines using vector embeddings and cosine similarity
  • Contributed to Node.js core -- automated ICU timezone updates via GitHub Actions

I've also contributed to open source:

  • Node.js -- ICU timezone automation (merged)
  • Gatsby -- published gatsby-remark-spellcheck plugin

Experience

Software Engineer -- Fleek (YC W22) Feb 2023 - Present · Bengaluru

Full-stack engineer at a B2B wholesale marketplace for secondhand fashion (Series A, backed by a16z, HV Capital). Joined just after seed round as one of the first Bangalore engineers.

  • Designed and built be-agents -- a production multi-agent AI system using LangGraph with broker routing, ReAct agents, and memory/retrieval pipelines
  • Built FleekOS -- an internal developer platform using MCP architecture, letting business teams spin up internal tools connected to production databases without engineering tickets
  • Shipped FleekSort -- AI-powered clothing grading pipeline at 95% accuracy using vector embeddings and cosine similarity
  • Built two production React Native mobile apps (buyer + supplier) from scratch in a monorepo
  • Owned serverless infrastructure on AWS Lambda, SQS/SNS, PostgreSQL, Redis, OpenSearch via SST/CDK
  • Led supply pod of 4-5 engineers; authored RFCs, ERDs, and architectural docs for major systems

Software Engineer -- OOZOU May 2021 - Jan 2023 · Bangkok

OOZOU is a premier product design and engineering agency based in Bangkok, building for clients across Southeast Asia.

Embedded with CP Axtra (Siam Makro) to build Makro Pro -- Thailand's B2B wholesale e-commerce platform. Joined as one of the first 10 engineers; team scaled to 100+ over two years. Took the platform from zero to ฿1M+ revenue per day. Today Makro Pro is the #1 grocery e-commerce platform in Thailand with 5,000+ daily orders and $300M+ GMV/year.

  • Built REST & GraphQL APIs orchestrating complex fulfillment flows across 100+ Makro stores
  • Developed frontend interfaces in TypeScript, NestJS, jQuery and Shopify Liquid
  • Owned end-to-end features for a marketplace serving thousands of business customers daily
  • Went from individual contributor to enabling colleagues -- improving team velocity through shared patterns and tooling

Software Engineer -- OYKU Jun 2019 - Apr 2021 · Bengaluru

Early employee at OYKU, a no-code platform that let podcasters, DJs, and YouTubers publish their own streaming apps to iOS, Android, and Alexa -- in under 30 minutes. Part of Pioneer accelerator; called for a Y Combinator interview.

  • Built Wild Planet -- an Alexa skill for animal sounds that hit 43,000+ daily requests in India in 2020
  • Developed the no-code creator hub frontend in React and backend microservices in Node.js + MongoDB
  • Built SEO-friendly marketing site in Gatsby
  • Worked across web, mobile, and voice (Alexa) -- often as the only or one of two engineers

I write occasionally about systems I've built. Some posts are here, also on Dev.to.