Senior Quality Engineer, Full Stack

At Offchain Labs, we aren’t just building products: we’re leading a movement.

As pioneers in blockchain scalability and security, we're at the forefront of transforming how the world interacts with decentralized applications. We're laying the foundation that will define the next generation of digital commerce, governance, and human interaction. This involves tackling real‑world challenges that come with scaling blockchain technology, without compromising on its core principles: decentralization, security and transparency.

At the center of this vision is our people. Our team is made up of thinkers and doers that embrace new challenges and seek solutions that push existing boundaries. If you’re energized by solving unprecedented problems, and believe in the role that decentralized systems will play in creating a more equitable digital future, then we want to hear from you.

Offchain Labs is setting the pace for the entire Ethereum ecosystem. We built the Arbitrum stack that powers Arbitrum One, the most widely adopted Ethereum scaling solution that exists today.

Arbitrum’s ecosystem is undergoing tremendous growth with hundreds of projects and dApps on Arbitrum One today. Over 100 different teams have used Offchain Labs technology to build their own Arbitrum chains. Major players in the space, Robinhood, Black Rock, Ethena Labs, Securitize, Aave, and Apechain are all using the Arbitrum stack.

Arbitrum’s thriving ecosystem wouldn’t exist without our advanced technology stack. Arbitrum, Prysm, Zero Dev. These aren’t just product names. These are tools that are actively reshaping what's possible on Ethereum and advancing its core infrastructure.

To top it all off? We’re backed by $124 million in funding. We’ve demonstrated consistent execution with billions in secured value, thousands of supported projects, and infrastructure processing millions of transactions seamlessly.

• As we continue to scale our ecosystem, we are looking for a Senior Quality Engineer to build and scale automated testing frameworks for our Full Stack Engineering team. This is a hands‑on, high‑impact role where you’ll implement our QA strategy, develop automation and testing infrastructure, and help us expand our QA team.
• Ensuring the reliability, security, and performance of a blockchain scaling solution is no trivial task. Bugs and vulnerabilities in smart contract execution, rollups, or state proofs can have massive implications. As part of our growing QA team, you will establish rigorous, automated testing pipelines that validate the integrity of Arbitrum’s protocol, its developer tooling, and its ecosystem. Your work will directly contribute to the security and trustworthiness of one of the most widely adopted Layer 2 solutions in the Ethereum ecosystem.

• Design and scale an end‑to‑end QA strategy for our Full Stack Engineering team
• Build and maintain sophisticated test automation frameworks (Playwright/Cypress) that validate security, performance, and correctness across the entire stack
• Seamlessly integrate automated testing into our CI/CD pipelines, ensuring that every release is battle‑tested before it hits the mainnet
• Go beyond “click‑and‑verify” by implementing fuzzing and property‑based testing to detect edge cases in smart contract interactions
• Own load and stress testing to ensure the Arbitrum stack thrives under transaction spikes
• Partner with Software Engineers, Smart Contract Devs, and Dev Ops to build a “Quality First” culture, turning manual processes into automated, reproducible workflows
• Collaborate with researchers and external auditors to automate vulnerability detection and regression testing
• Work closely with Dev Rel to ensure SDKs, APIs, and documentation are well‑tested and reliable for the growing Arbitrum developer ecosystem

• Strong experience using Type Script to build robust, maintainable tooling
• Deep automation skills with proficiency in Playwright or Cypress
• Experience managing cloud environments (AWS/GCP) and a “Dev Ops mindset” when it comes to CI/CD
• Proven ability to build QA processes from the ground up in a fast‑paced, high‑stakes environment
• Self‑starter…