Data Engineer

Location: London Contract: Interim / Long-term project Sector: Secure Banking & Payments Pay: £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.
• 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.