Software Engineer, TypeScript SDK

Company: Buildwithfern
Location: New York
Posted on: June 2, 2025

Job Description:

OverviewThis role is ideal for ambitious TypeScript engineers with entrepreneurial goals. We are looking for a TypeScript expert to lead the development of Fern's TypeScript SDK generator. Your work will directly influence the experience of thousands of developers using SDKs for companies like , , , , and more. You'll define what high quality looks like in TypeScript SDKs and help set the standard for the broader TypeScript community.Many of us are former or future founders, and this is an opportunity to scale a company from $1M to $10M ARR while partnering with fast-growing tech companies shaping the future of software. We value in-person collaboration and work out of our office in the Williamsburg neighborhood of Brooklyn.Sound like you? Get in touch.What you'll do

• Define TypeScript best practices. You'll set the tone for how a modern TypeScript SDK should feel - readable, idiomatic, and a joy to use. We're constantly raising the bar to make our SDKs the best in the industry. This is more than code generation; it's about crafting TypeScript libraries that developers trust and love.
• Build out our compiler. You'll own core components of our , defining the primitives that power every one of our SDKs. You'll implement new capabilities like and , and push the boundaries of what a generated SDK can offer.
• Engage with the TypeScript community. You'll stay on top of modern TypeScript tools and frameworks, incorporate best practices, and work directly with developers through GitHub issues and community forums to evolve the SDK based on real-world needs.
• Build our team. You'll work closely with our CEO and CTO to recruit and mentor new engineers as we scale.What you'll bring
  • Deep experience with modern TypeScript tools, such as , , and .
  • Strong grasp of TypeScript's evolving ecosystem - from runtimes like and to emerging standards like .
  • Enthusiasm for shaping language communities, like , our C# engineer who with the .NET team.
  • An eye for crafting a great developer experience.
  • (Bonus) You've worked in a high-growth SaaS company.
  • (Bonus) Experience working with OpenAPI, GraphQL, Protocol Buffers, AsyncAPI, or Smithy (AWS).What we offer
    • Engineering challenges that will push you to become a better developer.
    • Kind teammates who work hard.
    • First-hand experience building an early-stage startup.
    • A salary of $200,000 to $230,000 and equity.
    • Living proximity bonus of $18,000 per year if you choose to live near the office.
    • Meals (breakfast, lunch, and dinner) at the office.
    • Health, dental, and vision insurance.Our tech stack
      • Microservices: Express (Node.js), FastAPI (Python)
      • Postgres + Prisma ORM (Database)
      • Anthropic + Bedrock (LLM)
      • Fern (API)
      • AWS (Cloud)About the interview
      • Phone Screen with a founder
      • Technical Interview: Coding
      • Technical Interview: Decomp (System Design)
      • Work Trial (in office)
      • Offer!
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Keywords: Buildwithfern, Greenwich , Software Engineer, TypeScript SDK, IT / Software / Systems , New York, Connecticut