Offchain Labs

Develop and maintain secure backend services for key management and signing infrastructure in a blockchain scaling platform. | Strong backend engineering experience with security-first mindset, applied cryptography understanding, distributed systems knowledge, and operational maturity in Kubernetes and observability. | 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. The Role: • The Developer Platform team builds KMS, the key-management and signing service behind ZeroDev's embedded wallets (smart-account / account-abstraction wallets that app developers drop into their products). It is non-custodial: end users control their keys, and the service orchestrates secure creation, authentication, and signing on top of a third-party signing provider. This is security-critical infrastructure, externally audited, with a high review bar. You will own backend services and the cryptographic recovery and trust-model machinery around them on a small, high-ownership team, and help grow the platform from interactive consumer wallets toward programmatic and automated signing and programmable transaction policy. What you'll work on: • Go backend services that broker wallet creation, authentication, and signing at scale. • Key recovery and the committee trust model: distributed key generation and secret sharing that keep the service non-custodial, with recovery authority split across independent committees so no single party ever holds a user's key • Trusted Execution Environments: reconstructing and operating on key material under hardware isolation and remote attestation • Authentication and signing-provider integration: the user-facing auth methods that gate signing (passkeys / WebAuthn, OAuth, OTP, sessions, 2FA), and integrating with a third-party signing provider (authorization and policy flows, scoped credentials, quorum / consensus approvals) • Security review and hardening: writing design docs and decision records, working directly with external security auditors, and turning a high review bar into shipped code • Production operations on Kubernetes: observability and alerting, secrets and certificate management, on-call, and the compliance controls the domain requires (sanctions screening, PII-safe handling) Who you are: • A strong backend engineer who has shipped and operated production services in Go (or an adjacent systems language and is eager to go deep in Go) • Security-first by default: you reason about threat models, blast radius, and key custody as a habit, and you write code that holds up to security-critical review • Comfortable with applied-cryptography fundamentals (public-key crypto, signatures, key management). You do not need to be a cryptographer, but you can reason about it and learn fast • Solid on distributed systems and API design: idempotency, failure modes, and clean service boundaries • Operationally mature: Kubernetes, observability, and incident response are not foreign to you • Clear written communicator (design docs, decision records) who thrives in a collaborative, review-heavy culture Nice-to-have • TEE experience (AWS Nitro Enclaves, Intel SGX / TDX, or similar): attestation, enclave key handling, reproducible enclave builds • Threshold cryptography / MPC in practice: DKG, FROST or other threshold signatures, verifiable secret sharing, resharing • Account abstraction: ERC-4337, EIP-7702, smart-account or embedded / non-custodial wallet experience • Built on or integrated a custody / signing provider (Turnkey, Fireblocks, or similar), or built one • HSM / YubiKey / PIV / secure-element integration • Been on the receiving end of a third-party security audit and driven the remediation • WebAuthn / passkeys, OAuth / OIDC, and the Go crypto ecosystem Perks: • Remote-first global workforce + NY office • Annual company offsite + team onsites • 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 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. 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.

Provide high-touch executive assistance to the CEO including managing schedules, travel, communications, and confidential tasks. | Minimum 5 years supporting C-level executives in late-stage tech startups or public companies, strong organizational and communication skills, and based in Europe. | 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. Why Offchain Labs? 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, 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. We are looking for an exceptional executive assistant to support our Chief Executive Officer (CEO), based in Europe. This is a critical role where you will provide high-touch assistance ensuring the CEO can devote their complete attention to achieving the company's mission. The ideal candidate is even-tempered, trustworthy, and highly organized and thrives in a tech remote environment. Who you are: • Successful in supporting C-level executives in a high growth environment. • You are highly responsive, able to address urgent matters, and ensure the CEO's schedule runs smoothly. • You operate with a high level of security and confidentiality. • Possess a proactive approach to task execution and excel at anticipating future needs. • Take an active role in shaping information and organizational dynamics. • Have a keen eye for efficiency and process improvement. • Have a proven track record of working with late-stage technology startups or established public technology companies. • Demonstrate clear, direct, and empathetic communication skills, along with sharp listening abilities. • Display self-directed initiative in achieving outstanding work outcomes. • Based in Europe. What you’ve done: • Minimum of 5 years of experience providing high-touch, concierge-like support to a C-suite Executive. • Managed intricate and time-sensitive scheduling demands efficiently and proactively, while prioritizing conflicting requirements. • Organized detailed travel arrangements, itineraries, and agendas. • Collaborated on and coordinated projects and event planning activities, including off-site meetings and employee retreats. • Managed a high volume of emails, flagging important messages and coordinating calls and meetings as necessary. • Drafted and prepared confidential correspondence on behalf of C-suite executives. • Proficiently handled expense reports. Perks: • Remote-first global workforce + NY office. • Annual company offsite + team onsites. • 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. Attention Offchain Labs Job Seekers: 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 OCL employee or the legitimacy of an offer you received, please 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.