Software Development Engineer in Test (SDET) in London

At the company Benefit Services, you’re a trusted partner to organizations navigating some of their most important people decisions. We help clients build better workplaces, where people feel supported, empowered, and inspired to thrive. Whether it’s shaping benefit strategies, designing wellbeing programs, or advising on workforce challenges, the work you do here creates meaningful change for businesses and the people who power them.

Our agile development team are responsible for building internal and client-facing applications, including research, data, analytics and interactive investment tools. We deliver these through both web interfaces and function libraries. We make a big impact on the business and believe in continuous improvement.

We are looking for a new member to join our agile development team working on a major technical refresh and integration project for our Ada Advisory platform. The work involves significant updates to existing services and infrastructure as well as migration to a new Azure subscription. We need a comprehensive set of automated tests in place to validate both the remediation and the integration phases of the project.

How you'll make an impact

In this position you will be responsible for designing, developing and maintaining automation tests to extend our automation framework. You will work closely with other development team members to analyse requirements and determine the appropriate testing strategy to build and maintain an efficient CICD pipeline while ensuring the quality of releases.

You will help monitor automated test execution and overall test health — including identifying failures, diagnosing flakiness, and taking appropriate action to raise defects or remediate test issues. You will participate in agile ceremonies (sprint planning, standups, retrospectives, etc), performing hands‑on exploratory testing, designing and implementing test cases, and collaborating with team members to meet project timelines and quality goals.

About You

• Previous and proven experience in designing, developing and maintaining automated tests in a SaaS and continuous delivery environment
• Experience with Playwright
• Experience with API testing tools and frameworks
• Comprehensive knowledge of testing types: unit, integration, E2E, contract, performance
• Experience testing microservice architectures
• Solid C# programming skills with an understanding of modern and legacy .NET
• Frontend & JavaScript & React application testing experience and tooling e.g. Jest
• Modern JavaScript/TypeScript testing approaches
• SQL database knowledge
• Cloud and CI/CD understanding of Azure cloud platform
• CI/CD pipeline experience (Team City or Azure DevOps)
• Understanding of contract testing and API mocking
• Experience with performance testing tools (JMeter, k6, Azure Load Testing) and performance testing strategies

Compensation and benefits

On top of a competitive salary, great teams and exciting career opportunities, we also offer a wide range of benefits. Below are the minimum core benefits you’ll get, depending on your job level these benefits may improve:

• Minimum of 25 days holiday, plus bank holidays, and the option to ‘buy’ extra days
• Defined contribution pension scheme, which the company will also contribute to
• Life insurance, which will pay 4x your basic annual salary, which you can top-up to 10x
• Income protection, we’ll cover up to 50% of your annual income, with options to top up
• Health cash plan or Private medical insurance

Other benefits include:

• Three fully paid volunteering days per year
• Employee Stock Purchase plan, offering company shares at a discount
• Share incentive plan, HMRC approved, tax effective, stock purchase plan
• Critical illness cover
• Discounted gym membership, with over 3,000 gyms nationally
• Season ticket loan
• Access to a discounted voucher portal to save money on your weekly shop or next big purchase
• Emergency back‑up family care
• And many more...

We value inclusion and diversity. Inclusion and diversity (I&D) is a core part of our business, and it’s embedded into the fabric of our organisation. For more than 95 years, the company has led with a commitment to sustainability and to support the communities where we live and work.

The company embraces our employees’ diverse identities, experiences and talents, allowing us to better serve our clients and communities. We see inclusion as a conscious commitment and diversity as a vital strength. By embracing diversity in all its forms, we live out The company Way to its fullest.

The company is Disability Confident Committed. We have pledged to make sure our recruitment process is inclusive and accessible, in addition to supporting our existing employees with any long‑term health conditions or disabilities.

We understand that applicants may have disabilities, if you do, you may find some parts of the recruitment process more challenging than others. Don’t worry, we’re here to help, however, we can only do this if you let us know. Should you require reasonable adjustments to your application, please get in touch with us.

Our employing entity, Arthur J. the company Services (UK) Limited, is proud to be accredited as a Living Wage employer with the Living Wage Foundation. We are committed to diversity and opportunity for all and are opposed to any form of less favourable treatment on the grounds of gender or gender identity, marital status, civil partnership status, parental status, race, ethnicity, colour, nationality, disability, sexual orientation, religion/ belief, age and those with caring responsibilities.

The company believes that all persons are entitled to equal employment opportunity and prohibits any form of discrimination by its managers, employees, vendors or customers based on race, color, religion, creed, gender (including pregnancy status), sexual orientation, gender identity (which includes transgender and other gender non‑conforming individuals), gender expression, hair expression, marital status, parental status, age, national origin, ancestry, disability, medical condition, genetic information, veteran or military status, citizenship status, or any other characteristic protected by applicable federal, state, or local laws.

Equal employment opportunity will be extended in all aspects of the employer‑employee relationship, including, but not limited to, recruitment, hiring, training, promotion, transfer, demotion, compensation, benefits, layoff, and termination. In addition, the company will make reasonable accommodations to known physical or mental limitations of an otherwise qualified person with a disability, unless the accommodation would impose an undue hardship on the operation of our business.