Deepak Kumar Kesavan

Software Developer @Fire

Dublin, IE

As a Software Engineer at Fire.com, a leading digital payments platform for SMEs and fintechs, I focus on delivering scalable backend systems, secure cloud-native microservices, and seamless customer experiences. My work spans core payments infrastructure, fraud prevention, authentication, and customer onboarding. Key Contributions: Modernized legacy stack by upgrading from Java 8 to Java 17 and revamping the Spring ecosystem, addressing 100+ security vulnerabilities and boosting performance. Designed Camunda-based 2FA workflows, reducing authentication failures by 35% and enabling maintainable, auditable process control. Launched Monthly Service Fee billing, using DynamoDB and idempotent operations to ensure secure recurring payments, contributing 5–7% to monthly revenue. Automated customer onboarding with AWS Lambda, DynamoDB, and Insightly CRM, reducing onboarding time by 15% and improving sales efficiency by 50%. Built real-time Transaction Watchlist to flag and mitigate fraud risks across high-value or suspicious transactions.‍ Enhanced internal and customer-facing UI with AngularJS, ensuring high responsiveness and clean UX. Owned AWS Infrastructure, creating serverless solutions using Lambda, SQS, SNS, and CloudFormation, and monitored systems with CloudWatch and Kibana. Managed CI/CD pipelines using Jenkins, supported seamless production releases, and resolved live incidents with proactive monitoring.🧪 Established strong test coverage including JDBC unit tests, Controller E2E tests, and Selenium-based UI automation, ensuring robust, reliable deployments.