Senior Software Development Engineer in Test (SDET) / Quality Engineer

West London | £750 per day Inside IR35 | 6-Month Contract | Hybrid (2 Days Onsite)

We are seeking an experienced Software Development Engineer in Test (SDET) to join a high-performing platform engineering team working on large-scale transaction and data streaming systems.

This is an initial 6-month contract with a strong likelihood of extension, offering the opportunity to influence quality engineering practices across an organisation while remaining hands-on with development and test automation.

The Role

As a Senior SDET, you will combine software engineering expertise with quality engineering leadership. You'll be responsible for designing and building testing infrastructure, improving platform reliability, and driving quality initiatives across multiple engineering teams.

Working closely with platform engineers and data product teams, you'll play a key role in embedding best practices throughout the SDLC while helping deliver robust, scalable solutions.

Key Responsibilities

• Design, build, and maintain automated testing infrastructure
• Develop and implement functional and non-functional testing solutions
• Drive quality engineering best practices across multiple teams
• Collaborate with platform and product engineering teams to improve reliability and performance
• Champion Shift Left testing methodologies and Shift Right observability practices
• Contribute hands-on engineering expertise and feature delivery where required
• Support the continuous improvement of testing, monitoring, and release processes

Essential Skills & Experience

• Strong software engineering background with Python and/or Java
• Experience working on transaction processing and/or data streaming platforms
• Proven experience building automated testing frameworks and infrastructure
• Strong understanding of functional and non-functional testing
• Experience driving quality transformation and testing best practices across teams or departments
• Hands-on experience with monitoring and observability tools such as Datadog, Grafana, or similar
• Strong knowledge of Shift Left and Shift Right testing strategies
• Excellent communication and stakeholder management skills

Desirable Skills

• Kafka
• AWS
• Chaos Engineering / Chaos Testing
• Disaster Recovery Testing
• Contract Testing
• Experience working within cloud-native platforms and distributed systems

Contract Details

Location: West London (2 days per week onsite)
Duration: 6 Months initial contract
Extension: Strong likelihood of extension
Rate: £750 per day
IR35 Status: Inside IR35

This is an excellent opportunity for a quality-focused engineer who enjoys solving complex problems, building scalable testing solutions, and influencing engineering standards across a modern technology organisation.