Software Development Engineer in Test (SDET)

You're deeply knowledgeable about QA, and you’re generous in sharing that freely with developers, PMs, and leadership alike.

You make sound, timely calls, sometimes with incomplete information, and understand the wider implications for the project and the agency.

You're energised by creating something from scratch, not maintaining what someone else has defined.

You work comfortably across disciplines, coaching developers, advising PMs, and influencing the leadership team.

You're calm under pressure, take ownership of problems, and don't pass the buck.

Hands-on Playwright experience, including page object models, fixtures, parallel execution, and trace-based debugging. (Essential)

Strong TypeScript or JavaScript coding ability, writing test code that meets the same quality bar as production code. (Essential)

Experience designing and building automation frameworks from scratch, covering test data strategies, environment configuration, and retry and reporting patterns. (Essential)

Experience configuring automated test execution and quality gating within CI/CD pipelines, working collaboratively with backend developers who own the wider pipeline and hosting infrastructure. (Essential)

Comfortable reading and contributing to pipeline configuration written by others, rather than owning the CI/CD stack end to end. (Essential)

Familiarity with test reporting tools such as Allure or Playwright HTML reporter. (Desirable)

Version control with Git, including branching strategies, pull request workflows, and keeping test code in sync with feature development across multiple concurrent projects. (Essential)

Comfortable using AI tooling as part of a daily engineering workflow, including code generation, test authoring, and defect triage. (Essential)

Able to write effective prompts to get useful output from AI tools, and critical enough to know when to trust that output and when to override it. (Essential)

Familiarity with Drupal or equivalent CMS, including content types, views, user roles, permissions, and caching, well enough to write tests that reflect real-world behaviour. (Desirable)

Working knowledge of PHP sufficient to read and understand the code under test. (Desirable)

Experience testing RESTful APIs, including authentication flows and session handling. (Essential)

Confident use of Jira or similar software for issue tracking, workflow management, bug reporting, and communicating testing progress. (Essential)

Ability to write & maintain clear, concise documentation that helps developers, PMs, clients, and future team members understand decisions, risks, and testing approaches. (Essential)

Strong manual testing skills, including exploratory testing, regression testing, and validating complex user journeys alongside automated coverage. (Essential)

Understanding of WCAG 2.2 AA standards and how to test for compliance, using both automated tools and manual techniques. (Essential)

Experience with cross-browser and cross-device testing, including mobile viewports and assistive technology. (Desirable)

Significant experience in a senior SDET or QA lead role, having owned a testing discipline rather than just contributed to one. (Essential)

Ability to define and communicate a quality strategy, covering test plans, coverage standards, and risk-based prioritisation across multiple concurrent projects. (Essential)

Let us know if you have any of the following skills or experience, but it's not essential. 

Performance testing experience (k6, Lighthouse CI) or automated accessibility tooling (axe-core, Pa11y).

Security testing experience.

Agency or consultancy background.

ISTQB Advanced certification.

We act with trustworthiness, understanding and empathy with each other and our clients.

We like simple, elegant solutions to problems. Our processes make it easy to get work done and easy for our clients to work with us.

We show our clients the way, providing clear, concise and confident explanations and advice.

We take responsibility for our work, both individually and as a company.

Having fun is an essential part of working at Numiko. We develop great relationships with our clients and each other.

£55,000-£65,000, with great opportunities for progression.

With a generous holiday entitlement, including your birthday off.

We like a healthy work/life balance, so ask people to be in the office at least two days a week.

Your own yearly budget for personal development or just for nice things to improve your working life.