Typescript SDK Developer

The company offers one of the most trusted decentralized custody protocol, smart wallet infrastructure and platform, as well as flagship wallet for the ecosystem on Ethereum and the EVM. With 25 million transactions handled worth 65 billion dollars they are on a mission to unlock digital ownership for the world by continuing building robust and accessible tools that address web3’s biggest challenges.

• Size: 50 people
• Location: Berlin (Germany)
• Other locations: teams in the UK, Switzerland, Spain and Portugal

Tech Stack

• Backend services: Written in TypeScript and Python, hosted at AWS, orchestrated via Kubernetes
• Web app: Modern web tech stack with React.js and Next.js
• Mobile apps: Kotlin and Swift, potentially ReactNative or similar in the future
• Extensive test suites: E2E via Cypress, Postman, Unit tests in TypeScript/Jest

Missions

You will help the company design and evolve their set of TypeScript developer tools. Specifically, you will work on creating tools that enable other developers to build on top of the existing. This includes improving the current existing kits and creating new ones from scratch. The goal is to create production‑ready kits enabling account abstraction features to be easily used when developers create applications that interact with the company’s protocol.

• Create new SDK kits to enable easier interaction when using account abstraction features.
• Create integrations to interact with third party providers.
• Iterate on existing kits, adding new providers and improvements.
• Evaluate and ideate value capture opportunities on integrations level.
• Support external developers on SDK usage (e.g., StackExchange).
• Document the Product SDK integrations.
• Collaborate with product, engineering and design teams on third party integrations to improve UX.

Profile

• Experience with TypeScript and Node.js development environments (package managers, linters, code coverage, testing, etc.)
• Experience analyzing third party libraries, able to create a report with pros and cons.
• Experience maintaining third‑party libraries.
• Experience building an SDK for multiple and interconnected apps and libraries used in other live projects.
• Experience debugging and testing reported issues.
• Experience maintaining a project that is used by several other projects.
• Worked on projects that have been used in production.
• Testing knowledge (coverage, automation, integration).

Nice to have

• Experience with React.
• Experience with Web3 tools (Web3js, Ethers.js, Hardhat).
• Experience with Tenderly (blockchain transaction simulation).
• Experience with Cypress (E2E testing).
• Full time permanent role.
• Based in Berlin - Germany - Hybrid remote.
• Open to relocation (relocation packages / VISAs are available).
• Hardware and home working budget.
• Personal education and conference budgets.
• 30 annual vacation days (on top of National holidays).
• Friday afternoons on research or on a side project in the company’s ecosystem.
• Flexible working schedules and hybrid work policies.