Java Full Stack Developer

Role & responsibilities

We are looking for an experienced Java Full Stack Developer to design, develop, secure, and maintain scalable enterprise web applications. The candidate should have strong expertise in Java, Spring Boot, REST APIs, React.js, JWT, OAuth 2.0, Spring Security, SQL, and modern application development practices.

The ideal candidate will work across the complete application stack, developing responsive React-based user interfaces, secure Spring Boot backend services, and implementing authentication and authorization using JWT and OAuth 2.0.

Preferred candidate profile

Backend Development

• Develop scalable and maintainable applications using Java 8/11/17/21.
• Build RESTful APIs and microservices using Spring Boot.
• Implement business logic, validation, exception handling, logging, and API integration.
• Develop reusable backend components following clean-code and design principles.
• Implement database access using Spring Data JPA/Hibernate.
• Optimize SQL queries, database transactions, and application performance.
• Integrate applications with internal and third-party REST APIs.

Security JWT & OAuth 2.0

• Implement authentication and authorization using Spring Security.
• Design and implement JWT-based authentication.
• Configure JWT access tokens, refresh tokens, expiration, validation, and secure token handling.
• Implement role-based and permission-based authorization.
• Work with OAuth 2.0 authorization flows such as Authorization Code and Client Credentials.
• Integrate applications with OAuth/OIDC identity providers such as Keycloak, Okta, Auth0, Azure AD/Entra ID, or similar platforms.
• Implement secure API communication and protect endpoints against common security vulnerabilities.
• Understand token scopes, claims, roles, audiences, issuers, and token validation.
• Follow OWASP security practices for web applications and REST APIs.

React Front-End Development

• Develop responsive and reusable UI components using React.js.
• Work with React Hooks, functional components, state management, routing, and form handling.
• Integrate React applications with Spring Boot REST APIs.
• Implement secure login/logout and token-based authentication flows.
• Manage authenticated sessions and protected routes.
• Handle API errors, loading states, validation, and user notifications.
• Work with state-management technologies such as Redux/Redux Toolkit, Context API, or equivalent.
• Develop responsive applications using HTML5, CSS3, JavaScript/TypeScript.

Microservices & Integration

• Develop and maintain Spring Boot microservices.
• Implement service-to-service communication using REST APIs.
• Understand API Gateway, service discovery, configuration management, and distributed systems.
• Implement resilience, error handling, retries, and timeout mechanisms.
• Work with asynchronous communication using Kafka/RabbitMQ where required.

Database

• Strong experience with relational databases such as Oracle, PostgreSQL, MySQL, or SQL Server.
• Design tables, relationships, indexes, stored procedures, and queries.
• Perform query optimization and troubleshoot database performance issues.
• Experience with NoSQL databases such as MongoDB is an advantage.