Banking · Case study
Banking major in UK
Legacy core banking blocked product velocity. Every release window cost a weekend of operations risk.
The context
A major UK bank's settlement ran on a legacy core that turned every release into a weekend of operational risk. Product velocity was throttled by the cost and danger of change, and the run-rate of keeping the old stack alive kept climbing.
At a glance
- Sector
- Banking
- Headline result
- 40%
What we did
The approach.
- 01
Mapped the strangler path
We wrote a modernisation roadmap that retired the legacy core incrementally behind a stable interface, with no big-bang cutover and no single point of catastrophic failure.
- 02
Rebuilt settlement cloud-native
Settlement was rebuilt as a cloud-native, event-driven service with infrastructure-as-code and FinOps guardrails from the first commit.
- 03
Shifted security left
DevSecOps pipelines moved security and testing into the delivery flow, so releases became routine rather than high-stakes events.
- 04
Transferred the practice
Pipelines, runbooks and SLOs were handed to the bank's engineers, who now ship multiple times a week.
The outcome
What changed.
40%
lower run-rate cost
3×
faster deployment cadence
0
weekend-risk release windows
Let's talk
Want an outcome like this?
A senior engineer on the call from day one. Two weeks to a written architecture and a working reference build.