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Principal Software Development Engineer, London

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AJ BellLocation:

London, United KingdomJob Category:

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4Posted:

29.06.2025Expiry Date:

13.08.2025col-wideJob Description:

Job DescriptionWe are a technology-driven company building high-performing, scalable, and resilient software solutions. Our teams work with a modern tech stack including .NET, MongoDB, AWS, Jenkins, SQL Server, and streaming technologies.We’re looking for a hands-on Principal Engineer who can code, design scalable systems, manage Staff Engineers, and drive technical excellence across multiple teams. This role is perfect for a technical leader who still enjoys writing code while shaping architecture and mentoring engineers.About the roleAs a Principal Engineer, you will play a critical role in:Architecting scalable, high-performance systemsCoding and reviewing mission-critical features (at-least 60% hands-on)Managing and mentoring Staff Engineers and Senior DevelopersDriving best practices in software development and AI-powered engineeringOwning non-functional requirements (NFRs) such as security, scalability, and reliabilityOptimising cloud infrastructure and CI/CD pipelinesIf you thrive on solving complex technical challenges, leading by example, and empowering teams, this is the role for you!Key responsibilitiesHands-on coding (at least 60% of the time), working on core application components and system architectureTechnical leadership – guiding multiple teams and ensuring best practicesManaging and mentoring Staff Engineers – supporting career growth and technical excellenceArchitecting and scaling distributed systems and cloud-native applicationsDefining and enforcing non-functional requirements (NFRs) – scalability, security, performanceImplementing Test-Driven Development (TDD) and automation best practicesOptimising CI/CD pipelines with Jenkins and AWSLeading containerisation efforts with Docker and KubernetesCollaborating with cross-functional teams to align technical solutions with business needsResearch and implement AI-driven development tools to boost productivityWhat we’re looking forProven experience as a Principal Engineer / Lead Engineer / Software ArchitectProven hands-on coding experience with .NET, SQL Server, MongoDB, Angular/NextJS, AWS, and streaming technologiesStrong experience in building scalable and high-performance applicationsStrong experience managing Staff Engineers and Senior DevelopersSolid understanding of Test-Driven Development (TDD) and modern testing frameworksExperience with Docker and Kubernetes for containerisation and cloud deploymentStrong knowledge of CI/CD pipelines, automation, and deployment best practicesExperience with AI-assisted development tools is a plusExcellent leadership and communication skills – able to coach and influence teamAbout usAJ Bell is one of the fastest-growing investment platform businesses in the UK offering an award-winning range of solutions that caters for everyone, from professional financial advisers to DIY investors with little to no experience. We have over 593,000 customers using our award-winning platform propositions to manage assets totalling more than £90.4 billion. Our customers trust us with their investments, and by continuously striving to make investing easier, we aim to help even more people take control of their financial futures.Having listed on the Main Market of the London Stock Exchange in December 2018, AJ Bell is now a FTSE 250 company.Headquartered in Manchester with offices in central London and Bristol, we now have over 1,500 employees and have been named one of the UK''s ''Best 100 Companies to Work For’ forsix consecutive yearsand in 2024 named a Great Place to Work.At AJ Bell you can expect a friendly working environment with a strong sense of teamwork, we have a great sense of pride in what we do, and this is reflected in our guiding principles.Our perks and benefitsStarting holiday entitlement of 26days, increasing up to 31 days with length of service plus a holiday buy and sell schemeA choice of pension schemes with matched contributions up to 7%Discretionary bonus schemeAnnual free share awards schemeBuy As You Earn (BAYE) SchemeHealth Cash Plan – provided by SimplyHealthDiscounted private healthcare scheme and dental planFree gym membershipEmployee Assistance ProgrammeBike loan schemeSick pay+ pledgeEnhanced maternity, paternity, and shared parental leaveLoans for travel season ticketsDeath in service schemePaid time off for volunteer workCharitable giving opportunities through salary sacrificeCalendar of social events, including monthly payday drinks, annual Christmas party, summer party and much moreOngoing technical trainingProfessional qualification supportTalent development programmesPeer recognition scheme, with rewards including restaurant and shopping vouchers or time offMonthly leadership breakfasts and lunchesCasual dress codeAccess to a range of benefits from our sponsorship dealsHybrid workingAt AJ Bell, our people are the heart of our culture. We believe in building strong connections by working together. That''s why we offer a hybrid working model, where you’ll spend a minimum of 50% of your working time per month in the Manchester office. For new team members, an initial period will be full-time in the office to help you immerse yourself in our business and build valuable relationships with your colleagues.AJ Bell is committed to providing an environment of mutual respect where equal employment opportunities are available to all applicants and all employees are empowered to bring their whole self to work.We do not discriminate on the basis of race, sex, gender identity, sexual orientation, age, pregnancy, religion, physical and mental disability, marital status and any other characteristics protected by the Equality Act 2010. All decisions to hire are based on qualifications, merit and business need.If you like the sound of the above, or just want to know more about the company and the role, we''d love to speak to you.Array#J-18808-Ljbffr