Senior Software Engineer in Test (SDET)

Hargreaves Lansdown; Greater London; On-site; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Discretionary bonus

25 days holiday + bank holidays

Hybrid working

Pension up to 11%

Private medical insurance

Health care cash plans

Job summary

Hargreaves Lansdown is seeking a Software Development Engineer in Test (SDET) to join its cross-platform engineering team in the UK. You will work with React Native mobile developers and React web engineers to build and maintain a world-class automation framework for both mobile and web platforms, ensuring high-quality releases through robust automated testing and engineering excellence.

You’ll design, develop, and maintain automated test suites, implement test frameworks and CI workflows, and

Qualifications

• Proven ability to design and maintain automated test suites for web and mobile platforms.
• Strong proficiency in JavaScript/TypeScript and React tooling.
• Experience defining test strategies, acceptance criteria, and quality gates for new features.

Responsibilities

• Design, develop, and maintain automated test suites for web and mobile platforms.
• Implement test frameworks and CI workflows to improve coverage and reliability.
• Collaborate with developers to define test strategy and quality gates for new features.
• Build reusable automation components and maintainable test code.
• Conduct code reviews for automation contributions and ensure best practices.
• Maintain test coverage for shared business logic across React platform.

Skills

Automation suites

JavaScript/TypeScript

React architecture

REST APIs/GraphQL

CI/CD pipelines

Debugging

Agile communication

Job description

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.

About the role

We are looking for a highly skilled Software Development Engineer in Test (SDET) to join our cross-platform engineering team. In this role, you will work closely with React Native mobile developers and React web engineers to build and maintain a world-class automation framework spanning both mobile and web tech stacks.

You’ll be responsible for ensuring high-quality releases through robust automated testing, tooling, and engineering excellence.

What You’ll Do

Design, develop, and maintain automated test suites for web tech stack

Implement test frameworks and CI workflows to improve coverage and execution reliability.

Partner with developers to define test strategy, acceptance criteria, and quality gates for new features.

Build reusable components and abstractions to keep automation code clean, maintainable, and scalable.

Conduct code reviews for automation contributions to ensure best practices.

Build and maintain test coverage for shared business logic for React platform.

Reduce test cycle time and improve test stability.

What We’re Looking For

Strong experience developing automation suites.

Proficiency in JavaScript/TypeScript.

Solid understanding of React architecture & debugging tools.

Experience with REST APIs or GraphQL.

Experience with CI/CD pipelines

Strong debugging skills.

Excellent communication skills and experience working in agile environments.

Nice to Have

Experience in fintech or banking applications.

Familiarity with micro-frontend architecture.

Experience working with feature flags.

Familiarity with accessibility testing tooling.

Interview Process

Stage 1 - Screening interview (30 mins)

A brief conversation to review your experience, understand your approach to quality, and assess overall role fit.

Stage 2 - Technical take home exercise (1 week)

A take home technical test where you'll be asked to implement automated tests for an existing React application to ensure its quality.

Stage 3 - Technical interview (90 mins)

We will go over your submitted take home exercise to get a better understanding of how you solve problems, also we ask some behavioural questions to make sure you’re a good fit for our team and company culture.

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?

• Discretionary annual bonus* and annual pay review
• 25 days* holiday plus bank holidays and 1-day additional Christmas closure
• Option to purchase an additional 5 days holiday**
• Flexible working options available, including hybrid working
• Enhanced parental leave
• Pension scheme up to 11% employer contribution
• Income Protection and Life insurance (4 x salary core level of cover)
• Private medical insurance*
• Health care cash plans - including optical, dental, and outpatient care
• Health screening programme
• Help@hand - confidential support including mental health counselling and remote GP
• Wellhub - unlimited access to fitness providers and wellness coach sessions
• Variety of travel to work schemes with bike storage and shower facilities
• Inhouse barista and deli serving subsidised coffee and sandwiches
• Two paid volunteering days per year

* dependant on role level

** only available to select during our annual benefits window, in November each year

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.