The Challenge
A rapidly growing FinTech startup had outgrown their initial payment processing infrastructure. Their monolithic system, built for thousands of daily transactions, was now struggling with millions. Response times were climbing, downtime incidents were increasing, and they were losing deals because enterprise clients demanded better reliability guarantees.
They needed to scale their platform 100x while improving reliability from 99.5% to 99.99% uptime, all without disrupting their existing customer base or slowing down feature development.
Our Approach
We designed a comprehensive re-architecture strategy that allowed for incremental migration while maintaining continuous service. The key was building new infrastructure alongside the old, then gradually shifting traffic.
Phase 1: Foundation Architecture
- Designed event-driven microservices architecture for horizontal scalability
- Implemented multi-region active-active deployment for fault tolerance
- Built comprehensive observability stack with distributed tracing
- Established automated CI/CD pipelines with canary deployments
Phase 2: Core Services Migration
- Extracted payment processing into dedicated, isolated services
- Implemented event sourcing for transaction audit trails
- Built real-time fraud detection pipeline using stream processing
- Migrated to managed Kubernetes with auto-scaling policies
Phase 3: Performance & Reliability
- Optimized critical paths achieving sub-100ms latency at p99
- Implemented circuit breakers and graceful degradation patterns
- Built chaos engineering practices for resilience testing
- Achieved PCI-DSS Level 1 certification for enterprise readiness
Key Results
"TYGR Ventures helped us build infrastructure that enterprise clients actually trust. We went from losing deals on reliability concerns to winning them on technical excellence."- CTO, FinTech Startup
Technology Stack
- Cloud: AWS with multi-region active-active deployment
- Orchestration: Amazon EKS with Istio service mesh
- Messaging: Apache Kafka for event streaming
- Data: PostgreSQL (Citus), Redis, TimescaleDB
- Observability: Datadog, PagerDuty, custom dashboards
- Security: HashiCorp Vault, AWS KMS, SOC 2 Type II
Architecture Highlights
Event-Driven Design. Every transaction creates an immutable event stream, enabling real-time analytics, audit trails, and easy replay for debugging or migration.
Multi-Region Resilience. Active-active deployment across three AWS regions means no single point of failure. Traffic automatically routes around any regional issues.
Zero-Downtime Deployments. Blue-green deployments with automated canary analysis allow multiple production releases per day without service interruption.
Business Impact
The new platform directly enabled the company to close their Series B funding round, with investors citing the technical infrastructure as a key differentiator. Enterprise clients that had previously rejected them due to reliability concerns became customers within months of the new platform launch.
The engineering team's velocity also increased significantly - with proper observability and testing infrastructure, they could ship features faster with confidence.