Founding - SDK Engineer

About Unlink

Unlink's mission is to build the last missing piece of the blockchain puzzle: Privacy. We're rendering existing blockchains private, solving one of the most fundamental challenges preventing mass adoption of decentralized technology.

Looking for a place to do your life's work? Join us.

About the role

Own the developer surface of Unlink: from architecture to API design to developer ergonomics. Design and ship the SDKs that external teams use in production. You’ll define APIs, packaging, and docs so partners integrate in minutes, not weeks.

What you'll do

• Design, build, and maintain Unlink SDKs (Typescript, React, Node, Rust, WASM, etc.)

• Collaborate deeply with customers and teammates. You'll work closely with developers using Unlink, partnering to understand their needs and turn feedback into world-class solutions.

• Define clean, performant, stable APIs and abstractions (versioning, etc.).

• Package and distribute SDKs across all major JavaScript/Rust environments with best-in-class DX (tree-shaking, sourcemaps, proper module formats).

• Build example apps, quickstarts, and templates that demonstrate best practices.

• Partner with Backend, Protocol, and Frontend to align SDKs with onchain and offchain components.

You may be a good fit if you

• Have shipped production SDKs or libraries used by external developers

• Are deeply familiar with TypeScript/JavaScript ecosystem (ESM/CJS, bundlers, Node vs. browser)

• Have experience with Rust and compiling to WASM

• Understand package management, versioning, and backwards compatibility

• Care about API ergonomics and developer experience

• Write clear documentation and examples

• Have worked with blockchain or crypto libraries

Bonus points

• You've built SDKs for Web3 protocols (e.g., ethers.js, viem, Solana web3.js)

• You've published popular npm packages or Rust crates

• You have experience with cryptographic libraries or privacy protocols

• You understand zero-knowledge proofs or related technologies

What we offer

• Competitive salary with equity: A significant ownership stake in what we're building together.

• High-impact work: Build the core of our product and shape its direction. You won't be a cog in a machine.

• Ownership culture: Meritocracy is at our core. You'll drive major decisions and own your domain completely.

• Team & culture: Join a family of talented engineers who are passionate about blockchains and privacy.

• Growth: Events, conferences, and off-sites throughout the year to learn and connect.

Come work with us

Unlink is not a research lab. We solve hard problems to create concrete value for humanity. We're building the infrastructure that will make privacy on blockchains accessible to everyone. If you want to work on technology that matters, with a team that values ownership and merit, this is the place.

Process

1. Get to know each other with Paul-Henry - Intro call to discuss your background and the role

2. Live technical interview - Hands-on 1 hour task

3. Team meetup - get to know the Unlink team

4. Final review call and offer - Align on next steps

> We'll keep you informed at every step and aim for a 1-week turnaround.

Deadline to apply: None. Applications will be reviewed on a rolling basis.

> ℹ️ Not sure you meet 100% of the requirements? We encourage you to apply anyway