Business Analyst – AP Invoice Processing Transformation

Business Analyst (SME,Testing) – AP Invoice Processing Transformation (Basware) – Hybrid Daily rate: £350 – £450 (inside IR35)
London (3 days on-site per week)
Contract role – Immediate start preferred
My client is looking for an experienced Business Analyst with strong hands-on Accounts Payable (AP) invoice processing expertise to join a high-priority, GPO-led transformation programme.
This role requires a proactive, detail-oriented individual who can quickly immerse themselves in existing test artefacts, take ownership of end-to-end testing, identify defects, and document system and process behaviour. You will also act as a Subject Matter Expert (SME) to support operational training and handover.
You will work closely with GPO leadership, SMEs, and BPO/testing teams to ensure robust testing coverage and readiness for go-live.
Key Responsibilities Own and execute end-to-end invoice processing testing, covering: Invoice capture (OCR)
Validation
Approval workflows
Payment processing Review and enhance existing test scripts; design new test cases where gaps are identified
Independently investigate exceptions and defects, documenting clear findings and driving resolution
Produce high-quality process documentation, including: End-to-end flows
System behaviours
Exception scenarios
Known issues Collaborate with GPO leads, SMEs, and BPO/test teams to ensure consistent understanding and coverage
Act as an SME for AP invoice processing, supporting: Knowledge transfer
Operational readiness
Training materials Provide clear, actionable feedback to stakeholders
Support go-live readiness activities
Attend regular stand-ups and provide concise status updates Required Skills & Experience (Must-Have) Proven hands-on experience in Accounts Payable invoice processing (operations or transformation programmes)
Strong Business Analyst skillset, including: Requirements capture
Test script creation & execution
Process documentation Experience testing: Invoice capture/OCR tools
Downstream AP or ERP systems Ability to work independently, take ownership, and drive progress without constant oversight
Strong analytical mindset with curiosity to: Investigate end-to-end processes
Identify edge cases and exceptions Excellent communication skills: Clear defect reporting
Structured documentation Comfortable working on-site in London (3 days per week)
Must have right to work in the UK Desirable Experience Experience with SAP or other ERP AP modules
Background in GPO-led or shared services transformation programmes
Experience working with third-party BPO providers or offshore testing teams *Rates depend on experience and client requirements