Full Stack Lead Engineer

•Are you curious, excited by experimentation and always looking to innovate? •Do you want to work in embedded payments where you can keep learning and developing whilst getting hands-on experience? •Do you want to have the opportunity to play an important role in a rapidly growing and exciting Fintech business? If so, we would love to connect and collaborate! We want to hire ambitious, and value-adding talent into Modulr, one of the fastest growing payments businesses in the UK and Europe. Modulr is experiencing significant growth, and in this role you will work in a cross-functional team who are asked to solve a problem, rather than be handed a task to do. This is an excellent opportunity to work in a high-growth environment with a fast-paced and collaborative culture where you will have great opportunities to work on challenging problems across the entire technology stack. About us At Modulr our mission is to move money efficiently to power business productivity. We are building a new digital payments service to make money flow more efficiently through businesses and the economy. This is a new type of payments account that is built for businesses that need faster, easier and more reliable ways to move money. Our flexible platform and innovative approach allows our customers to utilise our payments account instead of a traditional bank account. Our accounts come with a sort code and account number, access to payment systems (eg Faster Payments and Visa) and everything our customers need from a payments account. They can instantly open as many accounts as they need, automate how they make and receive payments as well as the reconciliation processes these create. All in real time, 24/7 through their own systems utilising our API that integrates into any platform. Our founding team has a wealth of experience in the payments industry and growing successful businesses. Modulr is backed by payments giants PayPal Ventures and FIS Ventures, as well as startup and scale up specialists Blenheim Chalcot, General Atlantic, Frog and Highland Europe which enables us to leverage their resources and expertise to drive our growth initiatives. These partnerships provide us with the necessary provisions to propel our business to new heights. Modulr values •Building the extraordinary; going that extra mile. •Owning the opportunity; be passionate and proud of the time you invest. •Move at pace; reach goals faster whilst supported on your career journey. •Achieve it together, working collaboratively and being a Modulite. The Role The Full Stack Lead Engineer is a vital role within Modulr, where you will be responsible for building an autonomous, high performing engineering squad to foster an environment where decisions are delegated, made and communicated effectively. You will drive technical strategy with a strong emphasis on Python and FastAPI backend development while remaining deeply hands-on with core development. The role is a blend of hands-on Python development, technical leadership, mentoring, and operational excellence. You will lead the architecture and implementation of robust, scalable backend systems using FastAPI, cloud infrastructure on AWS, and coordinate full-stack solutions with frontend teams. Specific duties •Lead a squad of software engineers, driving technical excellence through code reviews, architectural guidance, pair programming, and mentoring with strong emphasis on Python and FastAPI best practices. •Technically efficient to write production-quality Python code, designing high-performance REST APIs, managing databases, async operations, and establishing coding standards. •Own backend architecture decisions and lead the design of scalable, robust systems using Python, relational databases (PostgreSQL/MySQL), caching layers, and message queues. •Lead technical strategy for AWS cloud deployments, ensuring security, reliability, scalability, and operational excellence. •Mentor team members to develop deep full stack exper…