Energy Major Modernizes Legacy Ecosystem with AWS Cloud Native

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Case Study

SAP Application Management Services
Infosys Cobalt
Digital Transformation

A France based energy major launched a strategic modernization initiative to transform a legacy application ecosystem into a scalable, secure, and cloud native solution hosted on AWS. The existing applications was deployed on Azure using a lift and shift approach, limiting performance, agility, and scalability while increasing operational overhead. Backend services running on single servers, fragmented authentication mechanisms, and database intensive reporting further constrained system reliability.

Infosys partnered with the client to re architect and refactor the application landscape by fully embracing AWS cloud native architecture. The modernization introduced containerized microservices, modern frontend delivery, centralized identity management, and secure database access patterns. The solution was designed to support both internal and external users across multiple affiliates, while ensuring high availability and resilience.

By leveraging managed AWS services and embedding security, scalability, and observability by design, Infosys helped the client significantly reduce downtime, improve performance, and streamline operations. The transformed platform delivers sub second response times for most user interactions and provides a future ready foundation that enables faster innovation, improved efficiency, and consistent digital experiences across the enterprise.

50^%

Downtime reduction

100^%

Operational efficiency

80^%

Technical debt reduction

70^%

Performance improvement

< 1^Sec

Response time

Key Challenges

Limited scalability due to a legacy frontend deployment model
Authentication relying on internal databases instead of AD based SSO
Backend bottlenecks from single IIS hosted services
Azure lift and shift approach limiting cloud native agility
Reporting workloads degraded performance by overloading the databases

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Infosys Approach

Re architected legacy Azure based applications into AWS native architecture

Containerized backend services and deployed on AWS ECS Fargate

Enabled authentication through Amazon Cognito with Active Directory integration

Established centralized observability using AWS CloudWatch and CloudTrail

Hosted Vue.js SPA frontend on Amazon CloudFront with affiliate specific routing

Implemented API Gateways and ALBs for secure path based routing

Secured database access using RDS Proxy with IAM roles

Eliminated on premises integration to enable fully cloud native deployment

The Solution

Scalable, secure cloud native architecture enabling modernization across energy-sector affiliates

Infosys modernized the client’s legacy application ecosystem by refactoring the Azure-based deployment into a cloud native architecture on AWS. Backend services were containerized and deployed on AWS ECS Fargate, enabling autoscaling, improved resilience, and simplified operations. A modern Vue.js single page application was hosted on Amazon CloudFront, enabling affiliate-specific routing and consistent digital experiences for internal and external users.

To strengthen security, Infosys implemented Amazon Cognito integrated with Active Directory for internal authentication. Backend services accessed databases securely through RDS Proxy using IAM roles, improving security posture and reducing connection overhead. Performance bottlenecks—particularly during reporting—were addressed through multi AZ database design and read replicas to isolate intensive workloads from transactional operations.

The solution also streamlined CI/CD by consolidating services into a single repository with independent pipelines, and implemented comprehensive monitoring and auditing using CloudWatch and CloudTrail to improve reliability and reduce MTTR.