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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Software Engineer (Crypto - SV) - US - 2026 - **Company:** Nubank Era, LLC - **Location:** Palo Alto, CA, United States - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Artificial Intelligence, Software Quality, Digital Assets, Distributed Systems, Python (Programming Language), Key Management, Blockchain, Rust (Programming Language), Ethereum, Bitcoin - **Published:** July 30, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=1dc81c42e01a3183 ## About the Role * Track record of building and operating cryptographic systems, blockchain infrastructure, or secure financial systems in production. * Deep understanding of cryptographic primitives, key management, signing protocols, and consensus mechanisms. * Strong software engineering fundamentals with experience in languages used in crypto infrastructure (e.g., Go, Rust, Java, Python). * Experience designing systems with an adversarial mindset: threat modeling, security reviews, and defensive architecture. * Understanding of financial regulation as it applies to crypto and digital assets, with experience building compliant systems. * Demonstrated ability to make high-stakes engineering decisions where correctness and security are non-negotiable. * Experience collaborating with security, compliance, and legal teams on system design and review processes. Nice to have * Experience with specific blockchain protocols (e.g., Ethereum, Bitcoin, Solana) and their integration patterns. * Background in DeFi protocols, custody solutions, or institutional crypto infrastructure. * Experience in fintech, payments, or other financial services environments with strict regulatory requirements. * Familiarity with HSMs, secure enclaves, and hardware-backed key management systems. * Proficiency with AI-assisted development tools and a thoughtful approach to leveraging AI in security-critical engineering. ## Description Nu is building secure, compliant crypto infrastructure that will expand financial access for millions of people across Latin America. In crypto, there is no margin for error - a mistake in production can be irreversible, with direct financial exposure. As we open our Silicon Valley engineering hub, we're looking for a Lead Software Engineer, Crypto who thinks adversarially, builds defensively, and operates at the intersection of cryptography, distributed systems, and financial regulation. You'll be part of a focused crypto team in Palo Alto, collaborating with security, compliance, and product teams across our global offices. Our crypto engineering culture values correctness above all - we design systems assuming they will be attacked, and build accordingly. We move deliberately, with a high bar for security reviews and code quality. In this role, you'll own cryptographic systems, protocols, or blockchain infrastructure for your domain - key management, signing flows, consensus mechanisms, and on-chain integrations. You'll ensure correctness, security, and regulatory compliance, and you'll be the person who says "no, that's not safe" and makes it stick. You'll be responsible for * Own cryptographic systems, protocols, or blockchain infrastructure for your domain, including key management, signing flows, and on-chain integrations. * Design and implement secure, compliant crypto infrastructure that meets the highest standards for correctness and reliability. * Think adversarially: design systems assuming they will be attacked, conduct threat modeling, and build defensive architectures. * Navigate the intersection of cryptography, distributed systems, and financial regulation, ensuring all systems meet compliance requirements. * Lead security reviews and code quality processes for crypto-related systems, enforcing a high bar for production readiness. * Collaborate with security, compliance, and product teams to ensure crypto features are both safe and user-friendly. * Mentor peers on crypto engineering best practices and contribute to the team's security-first engineering culture. ## Related Videos - [Future-Proofing FinTech With Blockchain Technology](https://www.wearedevelopers.com/videos/808-future-proofing-fintech-with-blockchain-technology) - [Pragmatic Blockchain Design Patterns: Integrating Blockchain into Business Processes](https://www.wearedevelopers.com/videos/1579-pragmatic-blockchain-design-patterns-integrating-blockchain-into-business-processes) - [OP_PUSH_TX and its applications in Bitcoin smart contracts](https://www.wearedevelopers.com/videos/146-op_push_tx-and-its-applications-in-bitcoin-smart-contracts) - [SSO with Ethereum and Next JS](https://www.wearedevelopers.com/videos/288-sso-with-ethereum-and-next-js) - [Introduction to sCrypt - a smart contract language for Bitcoin SV](https://www.wearedevelopers.com/videos/24-introduction-to-scrypt-a-smart-contract-language-for-bitcoin-sv) - [Blockchain, NFT and smart contracts for my application](https://www.wearedevelopers.com/videos/877-blockchain-nft-and-smart-contracts-for-my-application) ## Related Articles - [The Fastest-Growing Tech Sectors to Look Out for in 2025](https://www.wearedevelopers.com/magazine/373-the-fastest-growing-tech-sectors-to-look-out-for-in-2025) - [How Much FAANG Companies Actually Pay Software Engineers in 2025](https://www.wearedevelopers.com/magazine/230-how-much-faang-companies-actually-pay-software-engineers-in-2025) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [6 Emerging Technologies We’ll Learn About in 2025](https://www.wearedevelopers.com/magazine/381-6-emerging-technologies-we-ll-learn-about-in-2025) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)