Senior Backend Engineer

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 dApps on Arbitrum One today. Over 100 different teams have used Offchain technology to build their own Arbitrum chains. Major players in the space, 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. Arbitrum, Prysm, ZeroDev. 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. What You’ll Do: Work on the core infrastructure powering Arbitrum, the leading Ethereum scaling solution (20%). Tackle complex distributed systems challenges, optimize performance, and contribute to the security and scalability of Arbitrum (10%). Collaborate closely with research, product, and blockchain engineering teams, working at the cutting edge of blockchain technology alongside world-class engineers, including many industry leaders (10%). Provide ongoing technical support and engineering guidance to clients and internal stakeholders by diagnosing and resolving core platform engineering issues related to the company’s infrastructure and distributed systems (10%). Maintain the Nitro Testnode product, a development tool used by users to run local Arbitrum nodes, including implementing enhancements, troubleshooting issues, and ensuring reliability and usability for developers (10%). Conduct peer code reviews for engineering contributions to ensure code quality, architectural consistency, and adherence to software engineering best practices across the platform (15%). Establish and evangelize backend architectural standards, selection of tech stacks, and engineering best practices (5%). Design high-performance compiler pipelines and extensible SDK frameworks (10%). Work in collaboration with Security to resolve complex security issues and identify potential threats and vulnerabilities in code in distributed systems environments (5%). Drive the technical roadmap with the Product team for complex distributed systems and data modeling, overseeing the integration of multiple microservices, ensuring database scalability and integrity under high load, and designing “API-first” strategies that ensure longterm system interoperability (5%). What You’ll Need: Bachelor’s degree or U.S. equivalent in Computer Science, Cybersecurity, Computer Engineering, or a related field Plus 5 years of professional experience as a Software Engineer, Software Architect, or any occupation, job title, position designing, developing, and securing blockchain-based backend systems. In lieu of a Bachelor’s degree plus 5 years of experience, the employer will accept a Master’s degree or U.S. equivalent in Computer Science, Cybersecurity, Computer Engineering, or a related field, plus 3 years of professional experience as a Software Engineer, Software Architect, or any occupation, job title, position designing, developing, and securing blockchain-based backend systems. 3 years of professional experience developing backend systems utilizing backend programming languages (including Go or Rust) 3 years working on protocols that span from L1s to L2s, including when the system is trying to reduce dependence on L1 smart contracts 3 years of professional experience collaborating with research teams to conduct cutting-edge research in blockchain technologies and cryptocurrency platforms 3 years of professional experience building distributed systems, focusing on reliable broadcast protocols, distributed data structures, and high-performance database storage engines 3 years of professional experience working in collaboration with security and with coding in a security-focused mindset in distributed systems environments 3 years of professional experience working with blockchain protocols 1 year of experience working with WebAssembly, including writing high performant and high security code in production environments 1 year of professional experience utilizing cloud infrastructure and containerization technologies (including AWS, Docker, and Kubernetes). CONTACT: Please apply online at https://www.offchainlabs.com/careers Perks: Remote-first global workforce + NY office Professional reimbursement program (facilitates industry conference attendance, certifications, and more) Medical, dental & vision coverage (US + some other countries) 401k retirement plan + company match (US only) Wellness stipend Home office set up / ergonomic equipment program $193,461 - $291,000 a year Position is 100% remote; must reside in U.S.; reports to HQ in New York, NY. Salary: $193,461 - $291,000 per year. 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 [email protected] 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. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.