Senior Software Engineer
9 hours ago
Sheffield
Senior Software Engineer Digital Assets Infrastructure Remote (UK) About Zumo Zumo builds the infrastructure that makes digital assets work for businesses. Our platform provides a range of digital asset services through a suite of APIs and tools, enabling partners to build and scale their own products on top of our infrastructure. We’re a UK-based team driven by transparency, accessibility, and a belief that the benefits of blockchain technology should be available to everyone. We’re building something meaningful and we need engineers who care about quality to help us do it. The Role We’re looking for a Senior Software Engineer to join our established engineering team, reporting directly to the CTO. You’ll work across our core digital asset infrastructure as well as the client-facing portals and dashboards that our partners use day-to-day. This is a backend-heavy full-stack role. You’ll spend most of your time designing and building APIs and services in Node.js and TypeScript, but you’ll also own frontend work in React for partner-facing applications. We want someone who’s excellent on the backend and confident enough on the frontend to ship polished, production-quality interfaces. We use AI development tools daily across the team, whether that’s for code generation, debugging, or speeding up routine work. We expect you to be comfortable doing the same. You don’t need blockchain experience. If you have a genuine interest in digital assets and want to learn the domain, we’ll teach you the rest. Responsibilities • Design, build, and maintain backend services (Node.js) powering our digital asset platform as well as client-facing portals and dashboards (React), • Own features end-to-end: from architecture and design through implementation, testing and deployment to maintenance, • Design and evolve well-structured, documented APIs, • Continuously improve and optimise the technical infrastructure for performance, reliability, and maintainability, • Interact with partners and integration clients to understand their needs and support adoption, • Engage with the team via code reviews, knowledge sharing sessions and daily work, • Collaboratively drive engineering standards and technical decisions, • Work closely with Product to ship optimal technical solutions and maintain delivery transparency Skills & ExperienceWhat we’re looking for • 5+ years of professional software development experience, • Strong Node.js and TypeScript skills. This is the core of our stack, • Understanding of software design and architecture principles, ability to make substantiated technical decisions in collaboration with the team, • Understanding of distributed systems, microservices and event-driven architectures, • Solid experience designing and building RESTful APIs, • Comfortable working with React to build client-facing web applications or willing to learn, • Confident skills in relational databases, particularly PostgreSQL, • A disciplined approach to testing. You write tests as a matter of course, • Clear communication and the ability to work autonomously in a remote team, • Ownership mindset - you own engineering outcomes end to end and are proactive about finding the best solution to the problem and continuously improving our technology and client experience, • A team player - we believe that working closely together, helping each other and learning from each other is critical for delivering great outcomes Nice to have • Experience with AWS, infrastructure in general and tools to manage it (Terraform, CDK), • Background in fintech, payments, or regulated environments, • Front-end or full-stack experience, • Any exposure to digital assets, blockchain, or crypto, but genuine curiosity is what matters most Our Tech Stack • Node.js / TypeScript, • AWS (ECS / Fargate, Lambda, RDS, SNS, SQS, API Gateway, Elasticache), • React, • PostgreSQL, • Redis Salary £75k p.a. Benefits Our mission is to create an environment where you can do the best work of your career. • Remote-first: We have an office in Edinburgh, but remote is our primary way of working, giving you the flexibility to work from wherever suits you., • Generous time off: 40 days of holiday per year., • Professional development: A culture of learning, curiosity, and ongoing growth., • Pension: Flexibility to opt in to our voluntary company pension scheme. Our Values Inclusion inspires Zumo is accessible to everyone, everywhere. We believe the benefits of digital assets and blockchain are for everyone, and our decisions balance people, profit, and planet. Transparency wins We build with usability and security at the core. We make the complex simple and never hide behind jargon. Unshakable commitment We bring our best every day. Great work comes from a calm, focused environment, and we give feedback with respect. Love the adventure We don’t take the easy path unless it’s the right one. We explore constantly, and we accept failure as part of getting it right. At Zumo, we believe in the strength that difference brings to our business, our culture, and our community. We value the perspectives and experiences of all our colleagues and are proud to be an equal opportunity employer. Interested? Please apply via LinkedIn.