Principal Software Engineer - Investments

Define and document high level solution architectures, clearly outlining trade offs, risks, and dependencies. Provide clear architectural principles and best practice guidelines that empower teams to design excellent solutions. Foster a culture of data driven decision making , defining cross team metrics that support continuous improvement. Promote strong documentation practices, including Architectural Decision Records, Solution Memos, and C4 diagrams. Guide cloud architecture choices, particularly around container orchestration and the use of AWS services. Champion best practices for observability, logging, security, and networking. Identify opportunities to enhance Developer Experience and efficiency through smarter tooling and frameworks. Support engineering teams with mentoring, pairing, and skills development. Lead conversations around Event Driven Architecture, cost forecasting, and designing for the future state. Partner with Product and Engineering Managers to align priorities and delivery approaches. Demonstrated leadership in legacy technology transformation and cloud migration. Strong expertise in modern architectural patterns, cloud native design, and container orchestration. Skilled communicator able to influence and engage at every level of the organisation. Proven ability to balance trade offs, costs, and technical constraints. Experience coaching teams towards engineering and architecture best practices. Deep understanding of security, networking, observability, and system flows. Adept at producing clear, concise architectural documentation. Previous experience as a Solution or Enterprise Architect. Background in enterprise systems and legacy to modern transitions. Familiarity with TypeScript and/or Java. Understanding of Developer Experience optimisation tools and frameworks. dependant on role level only available to select during our annual benefits window, in November each yearHargreaves Lansdown is the UK's number one platform for private investors. Our purpose is to empower people to save and invest with confidence, and today, we are trusted with more than £120 billion by over 1.7 million clients.We are based in the heart of Bristol now with over 2,000 colleagues. We believe we have a workplace like no other, with constant learning, dynamic teams and a great ethos. We're steered by our core values that promote service, quality, innovation, and opportunity in everything we do.For more information about careers at HL and to see all our vacancies, please visit our .