Shang En Sim
Founding Engineer at Crater Inc. · San Francisco, CA
Software engineer, hacker, and community builder. I'm fascinated by systems — the software platforms we rely on, the economies we design, the communities we form. I feel most fulfilled when I get to improve them, to bring people a little more joy. You'll find me jumping between hacky prototypes and deeply-tested systems software, often in the same week.
CalHacks 12.0
HackMIT 2024
HackMIT 2025 with Sigil
Experience
Founding Engineer
Working on building software that understands you as you do.
Software Engineer
Ship full-stack features in Go, Python, and TypeScript for the Terra API platform. Designed AWS Fargate-based infrastructure, centralized observability, and launched AI agent features that halved custom-agent deploy time and drove 150% customer/revenue growth. Shipped Tyran.ai - a no-code health agent builder.
Full Stack Software Engineer Intern
Shipped Card Maximiser - a VISA card spend tracker rolled out to 10k+ users. Shipped Shopee and Lazada integrations along with a overhaul of internal payment systems.
Projects
Agentic chatbot that helps Terra customers integrate faster with the health API by answering docs questions and generating ready-to-run code snippets.
Semantic search over local and cloud files so you can ask natural language questions and retrieve relevant docs using embeddings and a reranker.
P2P communications platform for disaster zones that maintains local mesh connectivity and bridges to satellite and cellular via Skylo when available.
Blockchain-powered app for secure, verifiable prescriptions using smart contracts and IPFS to reduce fraud between doctors and pharmacists.
Platform that uses a swarm of AI agents to discover extraordinary talent by autonomously scouting candidates across public data sources.
Housing availability visualizer that aggregates GT housing data into an interactive dashboard for students during registration rush.
AI agent builder platform for health tech that lets developers compose agents grounded in user health data from hundreds of sources.
Private Python package registry on Cloudflare Workers + R2. JSON-only Simple Repository API targeting modern clients like uv.
Recommendations
- Browser AutomationDriver.devReal browsers on consumer hardware in the cloud with decent performance.
- Vector DatabaseturbopufferBlazing fast serverless vector database with great pricing.
- Python PackaginguvBest Python package manager. Incredibly fast, replaces pip, venv, and pyenv in one tool.
- TransitTransitBest transit app in SF. Real-time departures, trip planning, and GO integration all in one place.
- Web App HostingCloudflare Dev PlatformWorkers, Pages, R2, D1. Everything you need to ship web apps at the edge with zero cold starts.