Senior Python Developer

Referment is working with a UK wealth technology company whose platform is used by financial advice firms to manage portfolios, custody, execution and reporting for their clients. Everything on the platform is built by an in-house engineering team, and the business operates in a regulated financial services environment where reliability and security genuinely matter. It's now looking for a Senior Python Developer to play a critical role in designing, developing and optimising the platform. This is very much a hands-on engineering role with a leadership dimension: you'll drive the technical execution of projects, mentor other developers, and work closely with non-technical teams to turn business requirements into working software. The Role You'll take ownership of key components and features, ensuring they remain scalable, secure and performant. Alongside your own delivery, you'll provide technical guidance and mentorship to junior and mid-level developers, helping them grow their technical skills and understanding of system architecture. Much of the role is collaborative. You'll work closely with teams across operations, investments, client services, sales and finance to understand business requirements and translate them into technical solutions, making sure implementations align with both business goals and technical standards. You'll be accountable for the quality of what ships — driving code reviews, testing and best practices, and leading the investigation and resolution of production issues and performance bottlenecks. You'll deliver high-quality solutions on time, contribute to documentation and knowledge sharing, and keep the development and release workflow clear and consistent. What We're Looking For At least 8 years of professional software development experience, including a minimum of 4 years using Python as a core programming languageA proven track record of delivering scalable, high-quality solutions in production environmentsExperience mentoring and guiding developers, with strong technical leadership skillsA deep understanding of version control, testing, continuous integration and agile methodologiesStrong communication skills and the ability to engage both technical and non-technical teams, keeping everyone alignedA relevant Master's degree Also Valuable Proficiency in a second programming language such as C++ or JavaExperience in financial services or another highly regulated environment This is a permanent, hybrid role, with three days a week based in the central London office. The company is unable to offer visa sponsorship for this position. This Could Suit A senior backend engineer who wants to stay close to the code while taking real ownership of architecture, quality and mentoring — particularly if your background is in fintech or another regulated, product-led technology business. #Referment