SIT Manager

Location: London – onsite approximately twice per month

Clearance: Active SC Clearance required

Start: ASAP

The Opportunity

We are looking for an experienced System Integration Test (SIT) Manager to support a major public-sector transformation programme involving multiple interconnected systems and delivery partners.

This is a hands‑on Test Management role requiring someone who has personally owned System Integration Testing and UAT, rather than simply participated in the test phases.

You will take responsibility for SIT from initial planning and preparation through execution, defect resolution and formal exit, while providing test assurance and leadership across multiple suppliers.

Key Responsibilities

• Own and coordinate System Integration Testing (SIT) across multiple systems and delivery partners.
• Review requirements and technical integration designs to establish appropriate test coverage.
• Produce SIT Test Plans, test scripts, scenarios, test data and supporting artefacts.
• Lead SIT readiness and Go/No-Go, execution and exit meetings.
• Coordinate a virtual, cross-partner test team and provide clear direction throughout execution.
• Ensure test evidence is captured correctly and maintain appropriate traceability.
• Manage defects through identification, triage, resolution and retesting.
• Produce test status updates, metrics and formal Test Summary Reports.
• Create UAT scripts and coordinate testing directly with business users and stakeholders.
• Lead UAT execution and witness‑testing sessions through to acceptance.
• Review and assure test plans, scripts, evidence and other artefacts produced by delivery partners.
• Act as a QA/Test SME, challenging suppliers where required and driving testing best practice.
• Provide assurance across wider functional and non‑functional testing, including performance, accessibility and migration testing.
• 5+ years' experience within QA / Software Testing.
• Previous experience as a SIT Manager, System Integration Test Manager, Test Manager or Test Lead.
• At least 3 years' experience personally responsible for System Integration Testing.
• At least 3 years' experience personally responsible for UAT.
• Strong experience creating Test Plans, test scripts, scenarios and test data.
• Experience working from requirements and technical integration design documentation.
• Proven experience leading testing across multiple suppliers / delivery partners.
• Strong defect management and test governance experience.
• Experience with tools such as Jira, Zephyr, Azure DevOps or equivalent.
• Confident leading senior stakeholders, business users and technical delivery teams.
• Strong communication skills with the ability to challenge suppliers and drive delivery under pressure.
• Active SC Clearance is essential.

This would suit an experienced, hands‑on Test Manager who is comfortable taking full ownership of complex SIT and UAT delivery within a large-scale, multi-supplier environment.