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Nuvei

Global payments technology company. Migrated legacy Java monolith to microservices and DB2 to PostgreSQL, achieving 30% TPS improvement and 99.85% migration accuracy.

Nuvei project

Overview

Nuvei is a global payments technology company that powers growth for merchants and partners worldwide. With a platform processing billions of dollars in transactions, Nuvei needed to modernize their infrastructure to handle peak demand events like the Super Bowl while reducing operational costs and technical debt.

The Challenge

Nuvei faced two critical modernization needs:

  1. Scalability Crisis — Their Java monolithic application couldn’t handle peak traffic during high-demand events like the Super Bowl, risking downtime during their most critical transaction periods

  2. Database Costs & Limitations — Legacy DB2 infrastructure created significant licensing costs and performance bottlenecks that hindered growth

Our Approach

Microservices Migration

  • Architecture Redesign — Decomposed the monolithic Java application into scalable microservices
  • Event-Driven Design — Implemented event-driven architecture for better fault isolation and independent scaling
  • Zero-Downtime Deployment — Designed blue-green deployment strategies for seamless transitions
  • Load Testing — Rigorous performance testing simulating Super Bowl-level traffic

Database Migration (DB2 to PostgreSQL)

  • Comprehensive Data Mapping — Analyzed and mapped all data structures for migration
  • Parallel Run Validation — Operated both systems in parallel to validate accuracy
  • Automated Testing — Built automated verification for transaction integrity
  • Performance Optimization — Tuned PostgreSQL for payment processing workloads

Results

Microservices Migration

  • Super Bowl Ready — System now handles peak demand events without degradation
  • Improved fault isolation with independent service scaling
  • Faster feature deployment with decoupled services
  • Reduced blast radius for failures

Database Migration

  • 346,611 transactions migrated with 99.85%+ success rate
  • TPS improved from ~150 to 195 sustained throughput
  • Peak TPS of 476 — 3x improvement over legacy system
  • 25% query latency reduction across critical operations
  • Eliminated DB2 licensing costs — significant annual savings

Technologies

Java, Spring Boot, PostgreSQL, Microservice Architecture, AWS, Kubernetes, Event-Driven Architecture, CI/CD Pipelines

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