Case studies
Real engagements.
Measurable outcomes.
We embed in engineering teams, fix hard problems, and leave the infrastructure better than we found it. Here's what that looks like in practice.
How We Helped Tesco Mobile Ship Weekly Instead of Monthly
Tesco Mobile needed a team to own the full delivery lifecycle — dev, test, BA, and production — while working alongside a separate API team. We got them from monthly releases to weekly ones.
- Monthly releases became weekly — a 4× improvement in release cadence with no increase in headcount.
- Production bug rate dropped materially. Every feature was validated against mocks before it touched a live environment.
The Unglamorous Work That Keeps a Product Moving: Our Engagement with EY
Not every engagement is a dramatic transformation. EY needed a reliable engineering team to keep a data platform module healthy and ensure product decisions were grounded in data they could actually trust.
- Product teams had a module they could rely on — data was accurate, timely, and structured for decision-making, not just reporting.
- Technical debt was addressed continuously rather than deferred until a forced rewrite.
Modernising John Lewis: Frontend, Infrastructure, and Everything in Between
A long-running engagement spanning Next.js migration, GCP infrastructure, third-party dependency removal, microfrontend architecture, and CI/CD modernisation — across both John Lewis and Waitrose.
- Next.js PDP migration complete — frontend changes are faster, safer, and owned by the team rather than feared.
- Membership module live on GCP — scalable, observable, and free from on-site hardware constraints.
QA Stack Modernization for Avis
Transformed legacy QA processes with Serenity BDD and ReportPortal integration, improving reporting efficiency by 45%.
- 45% faster regression triage after every nightly run.
- Shared dashboard for 5 business units with a single green/red signal.
Erlang Backend Rewrite for Bulk SMS Provider
Rewrote the messaging backend in Erlang, optimizing performance and cutting cloud costs by 30%.
- 3× throughput headroom during carrier promotions.
- 30% reduction in monthly compute spend thanks to right-sized nodes.
Automation of Patient Portals
Implemented end-to-end test automation for patient portals, ensuring compliance and improving release velocity.
- Cut UAT cycle time from 15 days to 5 days.
- Automated evidence packs for auditors with zero redactions.