About Paxos  Today’s financial infrastructure is archaic, expensive, inefficient and risky — supporting a system that leaves out more people than it lets in. So we’re rebuilding it. We’re on a mission to open the world’s financial system to everyone by enabling the instant movement of any asset, any time, in a trustworthy way. For over a decade, we’ve built blockchain infrastructure that tokenizes, custodies, trades and settles assets for the world’s leading financial institutions, like Mastercard, Visa, Robinhood, and PayPal.  About the team The Custody team develops secure, scalable, and dependable digital custody solutions. We are a group of engineers passionate about building systems that empower our customers and their assets. Our team is committed to excellence, leveraging deep domain expertise in distributed systems, security, and blockchain to solve complex challenges and deliver outstanding service. About the role  As a Senior Engineer on the Custody team, you will play a key role in architecting, building, and maintaining Paxos’ crypto custody infrastructure and applications. You’ll use your deep technical expertise and hands-on skills to deliver secure and scalable solutions, collaborating closely across functions to help shape our technological direction and execute complex projects. What you’ll do  * Design, develop, and maintain mission-critical custody systems across multiple blockchains. * Collaborate with cross-functional teams including product, compliance, and infrastructure to define system architecture and technical requirements. * Ensure the reliability, security, and scalability of our services through best practices in software design, testing, and deployment. * Optimize existing issuance infrastructure to enhance performance, reduce latency, and improve operational efficiency. * Provide mentorship and technical guidance to junior engineers, fostering a culture of continuous learning and improvement. * Stay informed about emerging trends in blockchain, distributed systems, security, and financial technology to drive innovation within the team. * Participate in code reviews, architectural discussions, and technical decision-making processes. About you * 5+ years of software engineering experience, ideally in fast-paced, high-growth environments. * Proficiency in at least one modern programming language (Golang or Java preferred; Kotlin, Rust, Python, or C++ also valued.) * Solid foundation in computer science fundamentals, including data structures, algorithms, and distributed system design. * Experience building and maintaining cloud-native services using tools such as Kubernetes, Docker, Kafka, and AWS. * Strong debugging and problem-solving skills, especially in production environments. * Excellent collaboration and communication abilities; able to work effectively with cross-functional teams. * Experience working on high-throughput, low-latency systems, trading infrastructure, cryptography, or custody platforms is a strong plus. * A passion for innovation and driving technical solutions to real-world problems. Disclaimer: The first week of employment will be conducted in person at our New York City headquarters. By applying to this role, you acknowledge and agree that you will be able to travel to and work from our New York City office for onboarding during this period.   Important Notice for Paxos Applicants We’ve become aware of fraudulent accounts posting as Paxos recruiters on LinkedIn and other platforms. These scammers attempt to deceive applicants into paying for job opportunities or providing personal financial information. To verify a legitimate Paxos recruiter: * We only use @paxos.com email addresses * We never ask for payment or financial details to apply, interview, or work here * For technical roles, we do not perform a coding interview without prior screening by our engineering team Thanks for your interest in Paxos!