Location: London, United Kingdom

Role Overview

We are seeking an experienced contractor to support a critical programme migrating to an upgraded version of the FactSet B-One performance application. The role will focus on:

• Reconciliation of positions, transactions, and performance outputs across legacy and target systems
• Identification, investigation, and resolution of discrepancies
• Supporting UAT, parallel run, and post go-live stabilisation

The individual will work closely with internal teams and FactSet to ensure outputs are accurate, consistent, and fit for purpose, aligned with defined reconciliation success criteria
 

Key Responsibilities

• Perform detailed reconciliation of holdings, transactions, and performance outputs, comparing current vs. upgraded systems
• Investigate, explain, and resolve discrepancies, ensuring alignment within agreed tolerances
• Analyse root causes across data, configuration, and calculation logic differences
• Collaborate with SMEs and internal teams (Product, Technology, Operations) to resolve issues
• Track, document, and manage issues through structured logs in line with governance standards
• Support UAT, regression testing, and parallel run validation, including test execution and documentation
• Assist with evidence collection, audit traceability, and production readiness (entry/exit criteria)
• Validate completeness and integrity of key data inputs and support data quality control checks
• Act as a liaison across business, technology, and external project stakeholders, communicating issues and impacts clearly
• Provide post-go-live support, including issue investigation, monitoring, stabilisation, and continuous improvement

Key Skills & Experience

Essential

• Strong experience in investment performance measurement / attribution
• Hands-on experience with Position and transaction reconciliation
• Experience with data and calculation validation across systems
• Experience of system migrations, implementations, or parallel runs
• Strong analytical and problem-solving skills
• Advanced Excel skills (data analysis / reconciliation)

Desirable

• Experience with FactSet B-One, Aladdin or similar platforms
• Knowledge of asset management data flows (ABOR, positions, transactions) 
• Knowledge of performance calculation methodologies
• Familiarity with SQL / data extraction tools
• Experience working with system migration