Senior SDET – Web & Mobile API Testing in .NET

La Fosse; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

La Fosse has partnered with a SaaS business to recruit an experienced SDET for a growing team. This role will drive quality across a complex suite of web and mobile applications, working with engineering to improve testing capability, increase automation, and support the platform's ongoing modernisation.

The role requires strong C# / .NET experience, API testing background, and the ability to operate as a senior, self-sufficient QA, setting direction rather than taking it.

Qualifications

• Strong experience in C# / .NET environments.
• Proven background testing API driven architectures.
• Experience testing across web and mobile applications.
• Ability to operate as a senior, self-sufficient QA, setting direction.
• Experience working on modernisation / transformation programmes.
• Strong understanding of end-to-end testing strategy across multiple systems.
• Comfortable working across multiple applications / large, complex platforms.
• Experience integrating or testing third-party systems / external APIs.
• Exposure to full-stack environments (C#, backend services; Blazor desirable but not essential).

Responsibilities

• Drive quality across a complex suite of web and mobile applications in collaboration with engineering.
• Improve testing capability and increase automation.
• Support the ongoing modernisation of the platform.
• Operate as a senior, self-sufficient QA providing direction and mentorship.

Skills

C# / .NET

API testing

Web testing

Mobile testing

End-to-end testing

Third-party / external APIs

Senior / lead QA

Full-stack testing

Job description

La Fosse has partnered with a SaaS business to recruit an experienced SDET for a growing team. This role will drive quality across a complex suite of web and mobile applications, working with engineering to improve testing capability, increase automation, and support the platform's ongoing modernisation.

The role requires strong C# / .NET experience, API testing background, and the ability to operate as a senior, self-sufficient QA, setting direction rather than taking it.