Software Engineer, SDK Generalist

At Fern, we believe every software company should offer a world-class API. We're building the toolkit to make that possible. We enable customers like Square, ElevenLabs, Webflow, and Intercom to offer a best-in-class developer (DX) and agent experiences (AX).

Our team is primarily ex-Palantir and ex-founders, working together from our office in Williamsburg, Brooklyn. We give builders the autonomy to take ownership, the speed to move quickly, and the support to do the best work of their careers. Fern is growing more than 5x year-over-year, is at the Series A stage, and has raised over $10M from Bessemer and Y Combinator.

• Experience a hyper-growth startup: Join a top-decile growth company early. You'll get firsthand exposure to how a startup scales with visibility into product, engineering, design, and go-to-market. Thinking of founding a startup someday? This is the place to learn.

• High trust and autonomy: You’ll have ownership over meaningful projects from day one, with the freedom to shape technical decisions and influence product direction. We trust engineers to figure out the best path forward—without micromanagement.

• We move quick: Your code will ship quickly and be used by our customers within days (and sometimes hours). We prioritize shipping fast, and invest in the developer experience toolchain to make that possible.

• Few meetings and bureaucracy: No bloated sprint rituals or unnecessary status updates. Just clear priorities, thoughtful async communication, and space to build.

• Palantir-inspired customer obsession: Many of our engineers come from Palantir and bring the same focus on solving real customer problems. You’ll work directly with users to tackle their top developer priorities and shape the product through hands-on feedback.

As a SDK Generalist Engineer at Fern, you’ll define what great looks like for modern SDKs—making them idiomatic, reliable, and delightful to use. You’ll own parts of our open source compiler, shaping the core abstractions behind all generated SDKs.

• 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.

• 3+ years of software development

• Strong communicator; comfortable solving technical problems with customers

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

• 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

• Experience with OpenAPI, AsyncAPI, Protobuf, Conjure (Palantir), Smithy (AWS), Coral (Amazon)

• Your personal GitHub profile is a deep green from commits and side projects

• Prime office location in the heart of Williamsburg, Brooklyn

• Bonus $18,000 per year for living close to the office

• Free meals (breakfast, lunch, and dinner)

• Health, dental, and vision insurance

• Unlimited vacation

• Flexible WFH policy

• Domestic and international team offsites

1. Phone screen with a Fern engineer

2. Three interviews: one coding, one system design, one behavioral

3. Come onsite to meet and work with our team