Senior Security Engineer (Offensive)

At Offchain, 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. Why Offchain? Offchain 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 d Apps on Arbitrum One today. Over 100 different teams have used Offchain 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. The Role: What you'll do:

Conduct comprehensive code audits across a variety of internal applications and infrastructure.

Conduct comprehensive penetration tests across cloud environments (AWS), infrastructure, and backend applications.

Collaborate with detection engineering, threat intelligence, and incident response groups to review security controls, uncover coverage gaps, and enhance overall detection quality.

Build, maintain, and evolve custom offensive tools, scripts, and automation frameworks to increase assessment speed.

Offer offensive security expertise during incident investigations, including log analysis and root cause reviews.

Keep up with evolving threats, vulnerabilities, and attack methods; share research internally and engage with the wider security community.

Own offensive security projects from start to finish, mentor junior team members, and cultivate a culture of ongoing learning and knowledge exchange.

What you'll need: Nice-to-haves: Attention Offchain Job Seekers: This role cannot be performed in California, or Colorado. Please be advised that there has been a rise in fraudulent recruiter activities, particularly within the Web3 space. If you would like to confirm whether someone is an Offchain employee or the legitimacy of an offer you received, please email jobs@offchainlabs.com At Offchain, 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.