Java jobs in Germany

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, such as Robinhood, BlackRock, Ethena Labs, Securitize, Aave, and Apechain, are all using the Arbitrum stack.

Arbitrum’s thriving ecosystem wouldn’t exist without our advanced technology stack. The stack, which includes Arbitrum, Prysm, and ZeroDev, actively reshapes what’s possible on Ethereum and advances 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 Engineering teams. 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 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.

• Refine and implement the QA strategy for our Engineering teams.
• Establish test automation frameworks that validate correctness, security, and performance across Platform Engineering’s entire stack.
• Integrate QA into the CI/CD pipeline to ensure rigorous pre‑deployment validation of protocol updates and software releases.
• Develop fuzzing, property‑based testing, and other advanced verification techniques for smart contract security.
• Execute load and stress testing to measure scalability under high transaction volume.
• Work cross‑functionally to embed quality in the development process. Partner with software engineers, smart contract developers, and DevOps to establish a culture of quality across the engineering organization.
• Collaborate with researchers and external auditors to automate vulnerability detection and regression testing.
• Work closely with developer relations to ensure that SDKs, APIs, and documentation are well‑tested and reliable for the growing Arbitrum developer ecosystem.

• 3+ years in QA engineering, test automation, or software quality roles.
• Strong programming language skills in at least one language such as Go, Rust, JavaScript, TypeScript, Python, Java or similar.
• Strong automation skills, with proficiency in at least one testing framework (e.g., Playwright, Cypress, Pytest, Jest, Mocha, Selenium, etc.).
• Deep understanding of CI/CD pipelines and integrating automated testing within DevOps workflows.
• Ability to deploy to and administer virtual machines on a cloud infrastructure provider (e.g., AWS, Google Cloud).
• Ability to be a team leader & collaborate with various technical and non‑technical roles.
• Ability to drive process change and influence engineering teams to adopt best practices.
• Passionate about open‑source, decentralization, and blockchain technology.

Nice to have:

• Experience building QA processes from scratch in a fast‑paced, engineering‑driven environment.
• Experience with blockchain‑based, Web3 products and crypto wallets.
• Experience testing complex web and mobile applications, either manually or through automation.
• Familiarity with blockchain, Ethereum, and Layer 2 scaling solutions (or strong willingness to learn).
• Security mindset—familiarity with fuzzing, property‑based testing, and formal verification is a plus.
• Experience with performance testing for distributed systems, including load testing and bottleneck analysis.
• Prior experience mentoring QA engineers.

• Remote‑first global workforce + NY office.
• Annual company offsite + team onsite.
• Professional reimbursement program (facilitates industry conference attendance, certifications, and more).
• Medical, dental & vision coverage (US + some other countries).
• 401(k) retirement plan + company match (US only).
• Wellness stipend.
• Home office set up / ergonomic equipment program.

This role cannot be performed in California or Colorado.

Email: jobs@offchainlabs.com

At Offchain Labs, we are committed to building a welcoming and supportive workplace for all employees, regardless of their background or identity. We strive to create an environment where everyone feels valued and has an equal opportunity to succeed and thrive. We encourage candidates from all walks of life to apply and join our team.