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Migrating Critical Payment Infrastructure for a Leading Fintech Platform with AWS and Infrastructure as Code

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A leading fintech platform, while redefining digital payments and personal finance experiences for millions of users across India, faced critical challenges around scalability, cost efficiency, and regulatory compliance on their existing cloud infrastructure. It became essential to re-architect the platform for performance, resilience, and future scalability.

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Customer Challenge

A fast-growing fintech platform was previously running its core transaction processing, application workloads, and supporting infrastructure on Google Cloud Platform (GCP). With increasing user growth and transaction volumes, the platform encountered scaling, cost, and compliance bottlenecks. Key challenges included:
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Complex Platform Migration: Transitioning critical containerized applications (Kubernetes), databases (PostgreSQL), and supporting infrastructure (Redis, RabbitMQ, Neo4j, etc.) from GCP to AWS while preserving performance, security, and service reliability.
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Scalability and Future-Proofing: Designing an AWS architecture to accommodate rapid business growth and variable traffic patterns, with auto-scaling support, high availability, and disaster recovery for financial workloads.
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Security, Compliance, and Regulatory Alignment: Establishing a robust security foundation in AWS to meet or exceed current GCP controls—covering encryption, network segmentation, access management, audit logging, and compliance for payment and banking integrations.
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Minimized Downtime and Business Disruption: Orchestrating a phased migration (infrastructure, database, application cutover) with comprehensive rollback options, extensive testing, and synchronized change windows to ensure service continuity for end-users, partners, and payment systems.
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Seamless Integration and Service Mapping: Accurately mapping GCP services (GKE, Cloud SQL, Memorystore, Pub/Sub, VPC, Cloud Storage, etc.) to AWS equivalents (EKS, RDS, ElastiCache, SQS, VPC, S3), and updating application endpoints/configurations for interoperability.
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Operational Excellence & Knowledge Transfer: Delivering extensive migration documentation, operational runbooks, post-migration support, and training for the platform's technical team to ensure sustainable day-to-day operations on AWS.

Solution

Containerized applications, databases, and supporting infrastructure to Amazon Web Services. The migration leveraged AWS best practices and well-architected design principles, focusing on:
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AWS Landing Zone: Secure multi-account foundation, VPC, subnets, IAM, mandatory guardrails.
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Container Orchestration: Amazon EKS for managed Kubernetes clusters.
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Database Migration: AWS Database Migration Service (DMS) for the zero-downtime transfer of the key PostgreSQL database to Amazon RDS with continuous replication.
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Caching & Messaging: ElastiCache (Redis) and SQS/RabbitMQ for optimized performance.
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Security & Compliance: AWS WAF, Security Hub, GuardDuty, multi-layer network security, and auditing.
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Monitoring: Amazon CloudWatch, CloudTrail, and New Relic integration for observability.

Architecture

The target AWS architecture was designed for high performance, security, and future growth, comprising:
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AWS Landing Zone for governance and compliance
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Amazon EKS for containerized applications in multi-AZ clusters
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Amazon RDS PostgreSQL (multi-AZ, encrypted, automated backups)
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Amazon ElastiCache (Redis) for session management/caching
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RabbitMQ on EKS/SQS for messaging queues
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VPC with public/private subnets and NAT gateways supporting whitelisted payment integrations
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AWS WAF & centralized security monitoring
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Amazon S3 for object storage, backups
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AWS CloudWatch & CloudTrail for logs, metrics, and audit trails

Key Outcomes

Minimum-Downtime Migration: Seamless database transition, uninterrupted fintech services for users.
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High Scalability & Redundancy: Multi-region, redundant AWS architecture to support rapid business growth and high transaction loads.
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Robust Security Posture: Stringent guardrails and compliance standards (NIST, FSBP) adopted.
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Operational Excellence: Documented, automated, and monitored environment; ready for ongoing scaling and improvements.
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Business Continuity: Payment processing and integrations restored rapidly post-cutover.

Migrating Critical Payment Infrastructure for a Leading Fintech Platform with AWS and Infrastructure as Code

Customer Challenge

Solution

Architecture

Key Outcomes

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