Do not pass up this chance, apply quickly if your experience and skills match what is in the following description. Location: LondonContract: Interim / Long-term projectSector: Secure Banking & PaymentsPay: £550 - £650 per day Are you a Data Engineer who thrives in large-scale, mission-critical environments? We’re supporting a major banking programme delivering a high-stakes data migration within payments—an environment where precision, stability and performance genuinely matter. This is an opportunity to take ownership of complex extraction and migration activity in a live payments landscape, ensuring data integrity, zero disruption to BAU and a smooth transition for one of the UK’s most trusted financial institutions. What You'll Be Doing Leading high-risk, high-volume data migration in a banking environment, with a focus on payments and critical transaction platforms. Responsibilities include: Core Engineering Work Designing and delivering safe, controlled data extraction strategies from heavily-used production environments. Mapping, tracing and reconciling data across legacy and target systems. Validating migrated datasets to ensure accuracy, completeness and regulatory fit. Running ETL processes within tightly-governed production frameworks. Technical Environment A key element of this role is deep hands-on expertise with IBM DB2 on Mainframe, including: Indexing, clustering and partitioning Performance tuning and query optimisation Understanding how to operate within congested, high-throughput table structures Exposure to Oracle is beneficial for adjacent extractions across the wider programme. What Makes You a Strong Fit We’re looking for someone who demonstrates: High-scale systems experience where extraction must not impact live processing. Confidence working independently in ambiguous situations. Proactive identification of risks or production concerns. Clear, early communication when issues arise. Experience in retail banking payments, or in similarly high-risk, high-volume environments such as capital markets or trading platforms, is highly valuable. Why Join This Programme? Work on a major payments transformation with real business impact. Play a pivotal role in risk-free migration of critical data. Join a collaborative, secure, engineering-led environment. xehkeey Begin with interim discovery and mapping work, with scope to expand as senior resources onboard. If you’re a Data Engineer who enjoys complexity, thrives under pressure, and delivers clean, reliable outcomes in critical environments, we’d love to hear from you.