Case Studies/Banking
Monolithic to Microservices Migration for a Leading Retail Bank
Top-5 Canadian Retail BankCanada24 months
100%
Services decoupled
3×
Deployment speed
60%
Faster loan approval
0
Production incidents at cutover
Case study highlightsAt a glance —
At a glance —
the essentials.
The Customer
Top-5 Canadian Retail Bank
Industry: BankingRegion: CanadaDuration: 24 months
Application ModernizationMicroservices ArchitectureDevOps Enablement
Business Challenge
- The bank's Loan Origination and Processing System was a tightly-coupled JEE monolith — a single deployment unit serving every channel, with release cycles measured in months and outages that took down the entire lending business.
- Scaling for peak mortgage demand meant over-provisioning the entire stack, and any change required full regression testing across unrelated modules.
Our Solution
- Kumaran applied domain-driven design to decompose the monolith into bounded contexts — origination, underwriting, document management, decisioning, and disbursement — each becoming an independently deployable Spring Boot service.
- Event-driven communication via Kafka replaced synchronous chains, and a new API gateway preserved backward compatibility for channels during the multi-year migration.
- We stood up a CI/CD pipeline with automated contract tests, canary deployments, and blue-green release patterns to make production changes routine instead of risky.
Key Results
- 100% of the monolith was decomposed into independently scalable microservices with no production incidents during cutover windows.
- Deployment frequency tripled, with teams now shipping changes daily instead of quarterly — and rollback time dropped from hours to minutes.
- End-to-end loan approval time dropped 60%, directly improving customer NPS and originations volume.
By the numbers
100%
Services decoupled
3×
Deployment speed
60%
Faster loan approval
0
Production incidents at cutover
Get the full case studyGo deeper —
Go deeper —
download the PDF.
The downloadable report includes the complete technical narrative beyond the highlights above:
- Platform Specifications — Hardware, OS, runtime environment, and infrastructure topology — including detailed configuration of the source and target platforms.
- Architecture Diagrams — Before-and-after system topology, data flows, integration patterns, and component interaction maps from the production deployment.
- Project Scope — Workstreams, team structure, governance model, RACI matrix, and the phased delivery plan that kept stakeholders aligned.
- Migration Methodology — Phased cutover plan, parallel-run validation harness, automated regression strategy, and rollback playbook used to de-risk production changes.
- Performance Engineering — Bottleneck analysis, tuning techniques, and benchmarking results that drove the measured efficiency gains.
- Lessons Learned — What worked, what we'd do differently, and the reusable patterns we now apply to similar modernization programs.
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Download the PDF
Full breakdown — challenge, approach, results & metrics.
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