Founding Engineer

Jinba (YC W26); San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

Jinba (YC W26) is looking for a Full-stack Engineer in San Francisco to architect and build systems for their enterprise workflow automation platform. Candidates should have over 5 years of experience, expertise in TypeScript and React, and a deep understanding of system design and AI frameworks. Responsibilities include defining technical strategy and collaborating with customers to deliver product solutions. The role requires in-person work in San Francisco.

Qualifications

• 5+ years building products quickly.
• Deep understanding of system design and scaling distributed systems.
• Experience with AI frameworks and patterns.

Responsibilities

• Architect and build frontend and backend systems.
• Define technical strategy including data modeling and infrastructure choices.
• Integrate AI models for natural language pipelines.

Skills

TypeScript (backend and frontend)

React

System design

Database architecture

AI frameworks understanding

Modern deployment

Infrastructure as code (Terraform)

CI/CD pipelines

Job description

Full-stack engineer who understands vibe coding tools and how recent AI frameworks work. You'll build both frontend and backend for our enterprise workflow automation platform.

Responsibilities

• Architect and build both frontend and backend systems powering our vibe coding platform
• Define technical strategy: system design, data modeling, service boundaries, and infrastructure choices
• Integrate AI models and build reliable natural language to action pipelines
• Collaborate directly with customers to translate enterprise needs into product solutions
• Evolve infrastructure for reliability, observability, and performance at enterprise scale
• Ship fast while building sustainable, maintainable systems

Requirements

• 5+ years building products quickly
• TypeScript (backend and frontend), React
• Deep understanding of system design, database architecture, and scaling distributed systems
• Modern deployment and infrastructure (Vercel, Cloudflare Workers). Infrastructure as code (Terraform). CI/CD pipelines (GitHub Actions)
• Experience with AI frameworks (Vercel AI SDK, Mastra) and patterns (agentic loops, tool calling, streaming, MCP)

Bonus

• Understanding of tools like OpenCode and how they work
• Shipped AI/LLM products to production
• LLM observability and production debugging (Langfuse, Datadog)
• Experience at early-stage startups
• Major contributions to OSS projects

Mindset

• Founder mentality: hard work, independence, ownership
• Ready to work in person in San Francisco