US Utility Modernizes Legacy Applications with AWS Cloud

Client

A leading US‑based utility company embarking on a strategic modernization journey to transform legacy on‑premises applications and build a future‑ready cloud foundation on AWS.

Challenges

Rigid legacy systems difficult to adapt to modern business needs.
Monolithic architecture limiting flexibility, speed, and scalability.
Lack of automation causing delays and manual errors.
Skill gaps in cloud‑native and DevOps technologies.
Organizational resistance slowing modernization efforts.

Solution

Modernized legacy applications into AWS‑native microservices architecture for scalability and resilience.
Used Amazon Route 53, Amazon CloudFront, and Amazon Cognito to secure access and optimize delivery.
Deployed containerized microservices on Amazon ECS clusters to enable elastic scaling and faster releases.
Established API‑led connectivity using Apigee, enabling seamless integrations across enterprise systems.
Implemented centralized observability via Amazon CloudWatch, AWS Secrets Manager, Amazon S3, and log streaming through Amazon Data Firehose → Splunk.
Ensured business continuity by integrating modern AWS services with existing on‑premises systems (mainframe, Oracle, IBM Db2).

Outcomes Delivered

Achieved 50% faster time to market, enabling quicker innovation
Improved application performance by 50%, enhancing user experience
Reduced downtime by 60% through automated deployments
Zero on-premises maintenance cost after full transition to AWS

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Contributors

Dhiraj Thakur is a Solutions Architect with Amazon Web Services, specializing in Generative AI and data analytics domains. He works with AWS customers and partners to architect and implement scalable analytics platforms and AI-driven solutions. With deep expertise in Generative AI services and implementation, end-to-end machine learning implementation, and cloud-native data architectures, he helps organizations harness the power of GenAI and analytics to drive business transformation. He can be reached via LinkedIn

Krishna Prasad, a Senior Project Manager at Infosys, has over 19 years of experience leading initiatives in application development, modernization, migration, and Agile transformation.

Geetika is a Senior Consultant at Infosys with 10+ years of experience in the software industry. She has profound knowledge of architecting digital eco-systems with AWS cloud and IoT to build microservices based applications, focusing on decoupled design and serverless event-driven architecture

Ganapathykumar Ulaganathan is a Digital Solution Specialist with 7+ years of experience in Java backend engineering and AWS‑driven cloud solutions. He sspecializes in large‑scale modernization, cloud migration, and microservices architecture, enabling enterprises to transform legacy systems into scalable, cloud‑native platforms. I have contributed to enterprise‑scale modernization programs involving re‑architecture of monolithic applications, performance improvements, and cloud migrations aligned with business transformation goals.