Software Engineer, SDKs

About Fern:

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 their best work.

Why you should work here:

• 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 quickly: 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.

What you’ll do:

As a Software Engineer on the SDK team, 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.

• Be a polyglot. Contribute to code generators that output 9 languages, including TypeScript, Python, Go, Java, C#, Ruby, Rust, and Swift. That said, most of our open source compiler is written in TypeScript.

• Craft idiomatic code. Rely on your taste to set the standard for what "good" looks like in API SDKs. Whether it's code to poll for status, authenticate via OAuth client credentials, or subscribe to a WebSocket, you'll make our generated code feel like it was written by hand.

What we’re looking for:

• 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

Benefits:

• Prime office location in the heart of Williamsburg, Brooklyn

• Free meals (breakfast, lunch, and dinner)

• Health, dental, and vision insurance

• Unlimited vacation

• Flexible WFH policy

• Domestic and international team offsites

About the interview:

• Phone screen with a Fern engineer

• Three interviews: one coding and one system design

• Come onsite to meet and work with our team