Engineer EN02 - Mortgages Software Development Engineer in Test

This role is part of the Mortgages CIO function within Customer Technology (CT), under the broader COO organization. The team is dedicated to delivering IT solutions that prioritize the needs of both customers and colleagues.

As an SDET, you will be instrumental in driving the quality and reliability of our software by designing, developing, and maintaining scalable automated testing frameworks and tools, with a strong focus on API testing and ETL automation. Working closely with Software Engineers and Test Manager, you will integrate deeply into the development lifecycle, ensuring seamless support for our Integration and Migration Strategy from CI/CD perspective.

You will take ownership of implementing advanced test automation—including comprehensive API testing and robust ETL automation—that adhere to our architectural standards and delivery principles. Your expertise will help us uphold the highest quality standards while enabling continuous integration and continuous delivery pipelines.

With mortgages primarily distributed via brokers through online and API channels, your work will be key to supporting smooth integrations and scalable growth as we expand our product offerings in the Home and Landlord markets.

Beyond automation, this role will champion a culture of continuous improvement by advancing technical testing capabilities and advocating best practices across teams. Within Customer Technology, we are on a strategic path to enhance our market position and evolve in line with customer expectations, driven by our core values: More Rewarding Relationships, Simply Brilliant Service, and Focused, Fit, and Fast delivery.

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Your success isn’t based on how long you spend at your desk. You’ll have contracted hours, but we’re always happy to support flexible working wherever we can. That might mean working from home or different Nationwide offices or agreeing a working pattern to help you balance work and life. We will always strive to find a way that works for everyone.

At Nationwide we offer hybrid working wherever possible. More rewarding relationships are supported through our hybrid approach, bringing colleagues together across our UK wide estate, whilst also supporting generous access to home working. We value our time in the office to solve problems, to learn, and to feel connected.

For this job you'll spend at least two days per week, or if part time you'll spend 40% of your working time, based at Swindon or London office. If your application is successful, your hiring manager will provide further details on how this works. You can also find out more about our approach to hybrid working here.

If we receive a high volume of relevant applications, we may close the advert earlier than the advertised date, so please apply as soon as you can.

What you’ll be doing

• Design, develop, and maintain automated test scripts for API testing and ETL processes to ensure end-to-end coverage and data integrity.

• Execute and monitor automated test suites regularly to validate software functionality and performance across integration and migration activities.

• Collaborate closely with developers, quality leads, and technology teams to embed test automation early and throughout the software development lifecycle.

• Identify, troubleshoot, and report defects found during automated and manual testing activities, working with development teams to resolve issues.

• Support continuous integration and continuous delivery (CI/CD) pipelines by integrating automated tests to enable fast, reliable releases.

• Perform performance testing on APIs and ETL workflows to validate scalability and responsiveness under various loads.

• Maintain test environments and test data, ensuring they are up-to-date and reflective of production scenarios for accurate testing.

• Contribute to the improvement of test automation frameworks by suggesting and implementing enhancements, including optimizing test coverage and execution speed.

• Document test plans, test cases, and automation scripts clearly and maintain comprehensive test artifacts.

• Participate in sprint planning, daily stand-ups, and retrospectives to provide testing insights and contribute to the agile delivery process.

• Promote best practices in test automation and quality assurance across teams, supporting a culture of continuous learning and improvement.

• Stay updated with new testing tools, trends, and technologies, particularly in API and ETL testing domains, and share knowledge within the team.

About you

• Deep expertise in software testing and Functional Automation tools
• Experience in Test management activities
• Experience in Selenium – API Testing, ETL Testing tools, Java
• Experience with large-scale, complex systems and integrations.
• Experience in Migration projects
• Strong understanding of software architecture and design principles.
• Advanced problem-solving and analytical skills.
• Strong mentoring abilities.
• Excellent communication and collaboration skills.
• Strong organisational and multi-tasking abilities.
• Experience in Mortgage applications is added advantage

Our Customer First behaviours put customers and members at the heart of how we work together. They are the set of behaviours that every colleague needs to display, in every role: 

Feel what customers feel - We step into our customers’ shoes, using their feedback and insights to empathise with them and to understand their needs, so that every decision we make starts and finishes with our customers in mind

Say it straight - We are brave in speaking out and saying what we think – we’re honest and direct with good intent, openly sharing diverse perspectives to reach the best conclusions and using language everyone can understand

Push for better - We don’t settle for mediocrity, we challenge the status quo, taking responsibility for continuous improvement and personal development

Get it done - We prioritise what will have the greatest impact, we are decisive, and we take accountability for delivering brilliant customer outcomes

You can strengthen your application by showing how our customer first behaviours resonate with you, and where you may have already demonstrated these.

The extras you’ll get

There are all sorts of employee benefits available at Nationwide, including:

• A personal pension – if you put in 7% of your salary, we’ll top up by a further 16%
• Up to 2 days of paid volunteering a year
• Life assurance worth 8x your salary
• A great selection of additional benefits through our salary sacrifice scheme
• Wellhub – Access to a range of free and paid options for health and wellness.
• Access to an annual performance related bonus
• Access to training to help you develop and progress your career
• 25 days holiday, pro rata

What makes us different

‘Banking – but fairer, more rewarding, and for the good of society’

We forge our own path at Nationwide.

As a mutual, we’re owned by our members - those customers who bank, save or have a mortgage with us. We challenge the financial sector status quo. We don’t see customers as the engine of our own profit. We share our profits with them and put their needs first. Always there when they need us. Supporting them and their lives.

If you’re inspired by fairer finances, passionate about making a meaningful impact, and truly care about our customers, you’re one of us.

At Nationwide, you are challenged to grow and rewarded for doing so. Valued. Recognised. Inspired to be your best. As a community we want our working lives to count. As a team, we celebrate what we achieve. As a standard-setter, we work for the good of customers, communities, and broader society.

We are Purpose-driven. Uncompromisingly Customer. Unstoppably Nationwide.

What to do next

If this role is for you, please click the ‘Apply Now’ button. You’ll need to attach your up-to-date CV and answer a few quick questions for us. 

We respond to everyone, so we will be in contact shortly after the closing date to let you know the outcome of your application.