Software Engineer, Java

Overview

This role is ideal for ambitious Java engineers with entrepreneurial goals. We are looking for a Java expert to lead the development of Fern’s Java SDK generator. Your work will directly influence the experience of thousands of developers using SDKs for companies like Square , Cohere , and more. You'll define what high quality looks like in Java SDKs and help set the standard for the broader Java 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 Java best practices. You’ll set the tone for how a modern Java 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 Java libraries that developers trust and love.

Build out our compiler. You'll own core components of our open source compiler , defining the primitives that power every one of our SDKs. You’ll implement new capabilities like auto-pagination and server-sent events , and push the boundaries of what a generated SDK can offer.

Engage with the Java community . You’ll stay on top of modern Java 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 Java tools, such as Gradle , Maven , and OkHttp

Strong grasp of Java’s evolving ecosystem — from cross compatibility between Java and Kotlin to emerging standards like structured concurrency

Enthusiasm for shaping language communities, like Niels , our C# engineer who actively engages 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 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

Phone screen with a founder

Three interviews : one coding, one decomp, one behavioral

Onsite with our team