• Designed and developed cloud-native microservices using Java, Spring Boot, Spring Cloud, Hibernate.

• Implemented CQRS pattern, RESTful APIs, webhooks, and secure service communication.

• Automated infrastructure provisioning with Terraform, Terragrunt, and Ansible (dynamic inventory),

reducing deployment time by 40%.

• Orchestrated Kubernetes deployments using Helm, Kustomize, and ArgoCD; evaluated Rancher, Podman.

• Improved service security and reliability by implementing Istio on Kubernetes with zero-downtime canary

deployments, circuit breakers, retries, and gradual rollout ensuring 99.99% availability.

• Integrated Prometheus for monitoring and alerting of microservices.

✅ Environment: Java, Spring Boot, Spring Cloud, Spring Gateway, Spring Security, RESTful APIs, Hibernate, Keycloak (oAuth 2.0 and OIDC), Webhooks, PostgreSQL, AWS RDS, Kafka, TypeScript, Angular 15, Webpack, NgRx, HTML5, CSS3, Bootstrap, Angular Material, Docker, Kubernetes, Jenkins, Terraform, Ansible and Prometheus.

• Redesigned BanglaQR middleware for enhanced scalability, performance, and multi-tenant SaaS support.

• Built Dispute, Event Stream module, integrated ISO 8583 error propagation.• Developed RabbitMQ-based dispute resolver and Redis Stream integrations for data engineering.

• Deployed with Kubernetes (canary deployments); provisioned infra using Terraform.

• Developed backend and frontend (VUE) to configure merchant wise configurations.

• Prepared a PLSQL script to cancel subscriptions for three consecutive payment failure.

✅ Environment: Java, Spring Boot, Spring WebFlux, Spring Data JPA, Spring Cloud Stream, Spring Security, Microservices, Postgres, MySQL, Neo4j, ScyllaDB, Redis, Netty, SQS, RabbitMQ, Kubernetes, Docker, SLF4J, Vue JS, REST, Maven, Karaf, Camunda, Mockito, SonarCloud, Angular, Git, AWS

• Analyzed the requirements suggested, developed the solutions aligned with the application.

• Develop API, made R&D and creates Camunda tasks based on requirements on different profiles.

• Worked on required automation on server deployment.

• Implemented SonarCloud and code quality gate.

• Code review, write unit test, conduct demonstration to client.

• Proposed and developed a system for creating group trips from Excel Sheet.

• Created an icon independent, reusable service to write over an icon in dynamic position clustering.

• Fetching Vehicle Tracking System (VTS) data from multiple VTS sources.

• Created service fee payment posting module for admin portal (both Backend, Frontend).