Associate - Application Developer

• Role:Java Full Stack Application Engineer
  
• Department:Product – Technology
  
• Experience: 2 to 6 Years
  
• Employment Type:Full‑time | Permanent
  
• Education:BE / BTech or equivalent professional qualification
  
• Location:Mumbai
  
• Work Mode:5 Days Work From Office (WFO)
  

Key Responsibilities

• Design and developscalable RESTful APIsusing Java, Spring Boot, and Hibernate/JPA for UPI Global applications
  
• Build and maintainmicroservices-based architectures, integrating with internal and external payment systems
  
• Developresponsive, high-performance frontend applicationsusing React.js, Redux, and JavaScript / TypeScript
  
• Ensure seamlessfrontend–backend integrationfor real-time payment workflows
  
• Work withevent-driven systems (Kafka)for asynchronous transaction processing
  
• Implementsecure authentication and authorizationusing OAuth2, JWT, and industry best practices
  
• Optimize applications forperformance, scalability, reliability, and security
  
• Writeunit and integration tests, and participate in code reviews to maintain engineering standards
  
• Actively participate inAgile ceremoniesand collaborate with cross-functional teams
  

Key Skills & Experience Required

• Strong expertise inJava 8+ and above, including core programming constructs such as streams, collections, multithreading, concurrency, and functional programming, along with a working understanding of JVM internals such as memory model, garbage collection, and class loading
  
• Hands‑on experience withSpring Boot and backend frameworks, including dependency injection, REST API development, exception handling, and microservices-based application design
  
• Solid understanding ofmodern frontend development, with React.js, Redux, and TypeScript, including component architecture, hooks, state management, and efficient API integration patterns
  
• Familiarity withNode.js-based middleware concepts, including event loop behavior, non‑blocking I/O, and lightweight service orchestration
  
• Experience working withmicroservices and distributed systems, including REST API principles such as idempotency, API versioning, request validation, and error modeling
  
• Strong knowledge ofevent-driven architecture and messaging systems like Kafka, including topics, partitions, consumer groups, and asynchronous processing patterns
  
• Experience withSQL and NoSQL databases, including relational modeling, transactions, indexing, as well as NoSQL data modeling for scalability and performance
  
• Understanding ofcaching strategiesusing Redis or similar systems, including cache-aside patterns, TTL, and eviction policies
  
• Knowledge ofauthentication and security mechanisms, including OAuth2, JWT, secure API handling, and input validation
  
• Good understanding ofsystem design principles, including SOLID principles, layered architecture, and commonly used design patterns such as Factory, Strategy, and Proxy
  
• Exposure toDevOps practices, including version control (Git), build tools (Maven/Gradle), and environment-based configuration management
  
• Awareness ofobservability practices, including structured logging, metrics monitoring, and debugging production issues
  
• Strongproblem-solving, analytical, and communication skills, with the ability to work independently and in cross-functional Agile teams
  

Good to Have Skills and Experience

• Experience deploying applications oncloud platformssuch as AWS, Azure, or GCP
  
• Exposure toCI/CD pipelinesusing Jenkins, GitLab CI, or GitHub Actions
  
• Knowledge ofcontainerization and orchestrationusing Docker and Kubernetes
  
• Familiarity withhigh-availability, low-latency systems, particularly in financial or payment processing domains