Senior SDET - Framework Team
Job description
Senior SDET role at Semble to lead the evolution of the company's test automation capability and help make quality a shared engineering discipline. The role focuses on building a Quality Agent System using AI agents and deterministic automation, alongside a stable Playwright framework and CI quality gates.
At a glance
- Employment
- Full-time · Employee (employment agreement)
- Work mode
- Remote
What you'll do
- Lead the transformation towards a Quality Agent System, using AI agents and deterministic automation to continuously identify coverage gaps, generate and maintain tests, detect flaky tests, support exploratory testing, and surface reproducible defects
- Design safe, maintainable agent workflows with clear responsibilities, isolated execution, human review, and appropriate controls
- Establish the foundations required for this system, including a stable Playwright framework, reliable CI integration, ephemeral test environments, test data management, quality observability, and structured test knowledge
- Set up meaningful quality gates in CI and PR workflows, including coverage validation, framework conventions, high-risk code checks, and actionable failure reporting
- Rationalise the overcrowded E2E suite by identifying tests that belong at unit, API, or integration level, keeping E2E focused on critical user journeys
- Build and maintain a cross-layer coverage map and risk-based defect view
- Expand test coverage and surface quality gaps earlier in the development lifecycle, including through test scenario generation, mutation testing, and AI-assisted exploratory testing
- Contribute to company-wide quality strategy, tooling decisions, quality metrics, and shift-left adoption alongside the wider SDET and Engineering teams
- Coach engineers and SDETs on effective test design, the testing pyramid, Playwright, and contributing to the shared framework
What we're looking for
- 5+ years of professional experience as SDET or Test Automation Engineer
- A strong track record of designing, building, and evolving automation frameworks that are reliable, maintainable, and easy for engineers to adopt
- Hands-on experience building AI-augmented or agentic quality workflows, not only using tools such as Cursor or Claude to generate test code
- A pragmatic approach to AI adoption, with awareness of data privacy, security, clinical safety, cost, and false-positive risks
- Strong commercial experience with TypeScript-based automation frameworks
- Experience with test coverage strategy and applying the testing pyramid to reduce unnecessary E2E testing
- Experience writing unit, component, API and integration tests
- Knowledge of non-functional testing, including performance, accessibility, security, and reliability
- Exposure to DevOps tools and cloud infrastructure, including Jenkins, Bitbucket, Datadog, and AWS
- Strong written and verbal communication skills, with the confidence to represent the SDET function, challenge assumptions, and defend quality in release discussions
- Mostly autonomous in scope, owning and solving complex tasks or leading projects independently
- Able to work with peers from different functions and have an impact across department
- May be in a mentoring role for more junior team members and should be able to influence effectively and lead by example
Nice to have
- Playwright experience is highly desirable
- Experience with performance testing tools, such as k6, is desirable
Your team
SDET and Engineering teams
The Senior SDET will work alongside the wider SDET and Engineering teams and coach engineers and SDETs.
Benefits
Get the tech you need - latest MacBook (unless you prefer Windows) and a wide range of equipment to set up your home office ergonomically
Fantastic office space in Central London, right outside Monument - with a roof terrace, weekly animations, loads of natural light, and cute doggies
- £65-75k package (based on your experience and the value you can bring)
- Autonomy and ownership
- 36 days off: 25 holidays + bank holidays + 3 extra days (birthday and 'feel good' days)
- Private Health Insurance – covering physical and mental health, as well as dental and optical
- Work alongside an inspiring team – two founders started Semble after a successful startup exit
- Free bits coming with nice offices (barista coffee, tea, fruits, happy hours and activities)
Apply
About Semble
Enabling health professionals to amplify their impact
Semble improves the way healthcare is delivered to millions of people by providing doctors and their teams with powerful, innovative, intuitive, and secure software. Its cloud-based clinical system is used by thousands of clinicians, making their lives easier and saving them money, while structuring their health data to help research.
Mission
Enable health professionals to amplify their impact by providing doctors and their teams with powerful, innovative, intuitive, and secure software.
Key facts
- London, UK
- Healthcare software
- Cloud-based clinical system used by thousands of clinicians
- Two founders started Semble after a successful startup exit
- Office space in Central London, right outside Monument
What they value
- Impact - We do work that matters
- Collaboration – We are in it together
- Human touch – We care deeply