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
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
Ready to experience?
TALK TO EXPERTS
Infosys Approach
- Re architected legacy Azure based applications into AWS native architecture
- Hosted Vue.js SPA frontend on Amazon CloudFront with affiliate specific routing
- Containerized backend services and deployed on AWS ECS Fargate
- Implemented API Gateways and ALBs for secure path based routing
- Enabled authentication through Amazon Cognito with Active Directory integration
- Secured database access using RDS Proxy with IAM roles
- Established centralized observability using AWS CloudWatch and CloudTrail
- 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.
Business Outcomes
Achieved a 50% reduction in downtime, significantly improving availability
Delivered a 100% operational efficiency through simplified operations
Improved system performance by 70% via optimized compute and databases
Achieved sub second response times, with 90% of requests completing in under 1 second
Strengthened system resilience and enabled rapid response to evolving business changes
Benefits
Enhanced user experience, stronger security, and improved agility through scalable architecture and streamlined operations across affiliates.
- Reduced downtime by 50%, improving service reliability
- Faster response times for end users
- Higher performance through optimized compute and data layers
- Fully cloud native operations with lower overhead
- Elastic scalability supporting fluctuating demand
- Secure, centralized access across affiliates
- Simplified operations and faster issue resolution
