Principal Software Engineer

Excited to grow your career?

Our purpose is to make it easy for people to save and invest for a better future. We are looking for great people to join us, so please come and invest in YOUR future at Hargreaves Lansdown.

We know that sometimes people can be put off applying for a job if they don't tick every box. If you're excited about working for us and have most of the skills or experience we're looking for, please go ahead and apply. We’d love to hear from you!

About the role

About The Role

 As a Principal Software Engineer in our Investment Growth Tribe, you’ll be a senior technical leader, playing a key role in our technology transformation.

 This is a strategic role, where you’ll shape and communicate high-level architectures, set clear and supportive guardrails, work on POCs with teams, support them during challenging times, and empower engineering teams to deliver high-quality, data-driven solutions. It’s about influence, clarity, and enabling teams to thrive – with a focus on being approachable, engaged, and collaborative.

What You'll Be Doing

• 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.

About You

Essential:

• Demonstrated leadership in legacy technology transformation.

• 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 design patterns, security, networking, observability, and system flows.

• Adept at producing clear, concise architectural documentation.

Tech stack:

• TypeScript / React / Node.js / Terraform

• AWS: Kubernetes / ECS / Docker / Lambda / SQS / DocumentDB
  

Desirable:

• Previous experience as a Solution or Enterprise Architect.

• Background in enterprise systems and legacy‑to‑modern transitions.

• Familiarity with PHP and/or Java

• Understanding of Developer Experience optimisation tools and frameworks.

Interview Process

 

Our process is designed to be transparent and supportive, giving you the opportunity to showcase your skills and get to know us:

• Introductory conversation with our recruitment team (30 mins)

• Virtual first‑stage interview with Senior Engineering Manager (30 mins)

• Virtual structured technical and competency interview (2 hours) 

Working Schedule

 

Full‑time, with hybrid working, a minimum of 2 days in our Bristol office.

Why us?

Here at HL, we’re the UK’s number 1 investment platform for private investors, based in Bristol. For more than 40 years we’ve helped investors save time, tax and money on their investments.

To achieve our mission, we believe we have a workplace like no other, with constant learning, dynamic teams, and a great ethos. We're steered by core values that promote service, quality, innovation, and opportunity in everything we do.

What's on offer?

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Hargreaves Lansdown is an inclusive employer that values diversity in its workforce. We encourage applications from all individuals without regard to race, religion, gender, sexual orientation, national origin, disability or age.

This role may also be available on a flexible working or part time basis – please ask the Recruitment & Onboarding team for more information.

Please note, we are unable to provide employment sponsorship to candidates.

About Us

Hargreaves 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 careers website.