BLOCK 01 · Hero
FinCue - Banking System Migration
FinCue needed to migrate their legacy banking system to modern microservices architecture without any downtime or data loss.
99.99%
Uptime
BLOCK 03 · The Challenge
The Challenge
FinCue needed to migrate their legacy banking system to modern microservices architecture without any downtime or data loss.
Overview
FinCue partnered with us to migrate their legacy banking system to a modern microservices architecture without any downtime.
Challenge
A 20-year-old monolithic system was limiting innovation and costing millions in maintenance, but any downtime would violate banking regulations.
Solution
We implemented a strangler fig migration pattern with event-driven architecture, gradually extracting services while maintaining 100% uptime.
Results
Successfully migrated to microservices with 99.99% uptime, zero data loss, and 60% infrastructure cost reduction.
BLOCK 04 · Discovery Phase
Discovery Phase
Interviews
20
Systems Audited
15
Artifacts
80
BLOCK 05 · Solution Architecture
Solution Architecture
Implemented strangler fig pattern with event-driven architecture, gradual service extraction, and dual-write strategy for zero-downtime migration.
┌─────────────────────────────────────────────────────────────┐
│ ARCHITECTURE DIAGRAM │
│ │
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ │
│ │ Client │─────▶│ API │─────▶│ Database │ │
│ │ Layer │ │ Gateway │ │ Layer │ │
│ └──────────┘ └──────────┘ └──────────┘ │
│ │ │ │ │
│ │ │ │ │
│ ▼ ▼ ▼ │
│ ┌──────────┐ ┌──────────┐ ┌──────────┐ │
│ │ CDN │ │ Cache │ │ Storage │ │
│ └──────────┘ └──────────┘ └──────────┘ │
│ │
└─────────────────────────────────────────────────────────────┘
BLOCK 06 · Technical Stack
Technical Stack
Backend
Infrastructure
Legacy
BLOCK 07 · External Integrations
External Integrations
Plaid
What: Bank account linking
Why: Customer account verification
Stripe
What: Payment processing
Why: Transaction handling
BLOCK 08 · Implementation (Phased)
Implementation Timeline
Legacy System Audit
Microservices Architecture Design
First Service Migration (Auth)
Core Banking Services Migration
Legacy System Decommission
BLOCK 09 · Key Technical Decisions
Key Technical Decisions
Strangler fig pattern
Tradeoff: Longer migration timeline
Why: Zero-downtime requirement for banking operations
Event-driven architecture
Tradeoff: Increased system complexity
Why: Needed for service decoupling and audit trail
Dual-write strategy
Tradeoff: Temporary data duplication
Why: Safe rollback capability during migration
BLOCK 11 · Results and Impact
Results and Impact
99.99%
Uptime
0
Data Loss
60%
Cost Reduction
5x
Deployment Speed
BLOCK 12 · Client Testimonial
Client Testimonial
"The migration was flawless. We moved from a 20-year-old system to modern microservices without a single minute of downtime."
Jennifer Park
VP of Engineering, FinCue
BLOCK 13 · Engagement Team
Engagement Team
BLOCK 14 · Lessons Learned
Lessons Learned
Strangler fig pattern essential for zero-downtime migrations
Event sourcing provides safety net for financial systems
Gradual rollout with feature flags reduces risk
BLOCK 16 · Next Case Study
Next Case Study
ObjectFirst - Enterprise Storage Solution
Test challenge description
BLOCK 17 · Related Work
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