Software Engineer, SDK Generalist

Overview

This role is ideal for ambitious engineers with entrepreneurial goals. We are looking for a generalist engineer to contribute to the development of Fern’s SDK generators. Your work will directly influence the experience of thousands of developers using SDKs for companies like Square , ElevenLabs , Cohere , Intercom, and more.

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

• Drive feature parity between languages. For each SDK language our generator supports, we need to support 15+ features like auto-pagination and server-sent events . We’re constantly raising the bar to make our SDKs the best in the industry. By collaborating closely with our users—often through GitHub Issues—we’re crafting tools developers rely on to build the future.

• Expand SDK language selection. Our customers are asking us to support a broader range of SDK programming languages, such as Swift, Rust, and Terraform providers. Once you get a grasp of our open source compiler, you could author the next generator.

• Be a polyglot . Contribute code across repositories in different programming languages. You may write code in TypeScript, Python, and Go within the same week.

• 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

• Understand the broader language ecosystem (e.g., runtimes in JS/TS, type checkers in Ruby)

• Enthusiasm for shaping language communities, like Niels , our C# engineer who actively engages with the .NET team

• Significant experience with TypeScript and expertise in at least one other programming language

• An eye for crafting a great developer experience

• Attention to detail

• ( Bonus ) You've worked in a high-growth SaaS company

• (Bonus) Experience working with the OpenAPI specification, Conjure (Palantir), or Smithy (AWS)

What we offer

• Kind teammates who work hard

• First-hand experience building an early-stage startup

• 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

• Unlimited vacation

• Domestic and international team offsites

Our tech stack

• Microservices: Express (Node.js), FastAPI (Python)

• Postgres + Prisma ORM (Database)

• Anthropic + Bedrock (LLM)

• Fern (API)

• AWS (Cloud)

About the interview

About the interview

1. Phone screen with a founder

2. Three interviews: one coding, one decomp, one behavioral

3. Onsite with our team