Senior Java Developer

Backend Development - Design, develop and maintain backend services using Java and Spring Boot. - Build reliable and scalable REST APIs. - Develop integration workflows involving orders, inventory, fulfilment, tracking and product data. - Write clean, reusable and maintainable code. - Implement validations, exception handling, retry mechanisms and failure recovery. - Optimise existing modules for performance, reliability and scalability. - Participate in architecture and technical design discussions. - Refactor legacy code where required without affecting existing customers. API and Integration Development - Integrate with external platforms using REST and SOAP APIs. - Work with API authentication mechanisms such as OAuth 2.0, API keys and access tokens. - Handle pagination, rate limits, retries and API failures. - Design and consume webhooks. - Analyse API requests, responses and error messages. - Develop data mapping and transformation logic between different platforms. - Ensure integrations are idempotent and do not create duplicate transactions. - Maintain compatibility with third-party API changes and version upgrades. Production Troubleshooting - Investigate production incidents using application logs, database records and monitoring tools. - Identify root causes instead of applying temporary fixes. - Analyse performance issues, memory problems, connection pool exhaustion and slow database queries. - Troubleshoot intermittent API, webhook, scheduler and queue-related failures. - Provide technical findings to support, QA and operations teams. - Implement permanent corrective and preventive actions. - Participate in critical incident resolution when required. Database Development - Design and maintain MySQL database structures. - Write and optimise SQL queries. - Create appropriate indexes and analyse execution plans. - Handle large-volume data processing efficiently. - Identify duplicate, inconsistent or incomplete records. - Work safely with production data and database migrations. - Understand transactions, locking, isolation levels and concurrency. Code Quality and Reviews - Review code written by other developers. - Identify defects, security issues, performance risks and maintainability concerns. - Enforce coding standards and engineering best practices. - Write unit and integration tests. - Ensure adequate test coverage for critical workflows. - Participate in pull-request reviews and release validation. - Mentor junior and mid-level developers. Performance and Scalability - Design systems that can process high-volume orders and API transactions. - Improve scheduler, batch and queue-processing efficiency. - Identify memory, CPU, thread and database bottlenecks. - Design asynchronous processing where appropriate. - Ensure that services fail safely and recover correctly. - Support horizontal and vertical scaling decisions. Cross-Functional Collaboration - Work closely with product analysts, business analysts, QA engineers and support…