Senior Java Developer

Senior Backend Engineer will be responsible for architecting and developing the backend systems that power our Ecommerce payment gateway (NGenius Online). Will work collaboratively with cross-functional teams, including frontend developers, product managers, and DevOps engineers, to ensure the robustness, scalability, and security of our backend infrastructure. Responsibilities Lead the design, development, and maintenance of the backend systems that drive our Ecommerce payment gateway, ensuring high performance and scalability. Utilize strong knowledge of MongoDB and MySQL to design efficient and reliable database schemas, optimize queries, and maintain data integrity. Create and maintain micro services using Java, adhering to best practices in software design and development. Work with cloud platforms (e.g., AWS, Azure) to deploy and scale backend services, utilizing cloud-based technologies such as server less computing and containerization. Implement security best practices, encryption, and access controls to ensure the security and compliance of our payment gateway backend. Mitigate vulnerabilities in codebase, plan and implement versions migration of the system parts. Continuously monitor and optimize backend performance, identifying and addressing bottlenecks and improving response times. Investigate and resolve backend-related issues, collaborating with DevOps and frontend teams as necessary. Participate in code reviews, mentor junior engineers, and uphold high code quality standards. Maintain thorough technical documentation for backend systems, APIs, and micro services to facilitate collaboration and knowledge sharing. Qualifications Bachelor's degree in computer science (software / application) or equivalent Minimum of 6+ years of relevant experience Strong knowledge of MongoDB and MySQL database systems. Enterprise experience with the following Java based frameworks: Spring-framework, Spring-boot, Spring-cloud, Quarkus. Experience with microservices architecture and design patterns. Experience in Keycloak, OAuth2.0, OpenID, and streaming platforms (Eg: Kafka, Azure Events Hub etc.) Working knowledge of cloud platforms (e.g., AWS, Azure) and containerization technologies (e.g., Docker, Kubernetes, Helm chart). Familiarity with security standards, encryption, and access control. Strong knowledge of HTTP, XML, REST, SOAP, Web Services, SOAP UI, WSDL is must. Excellent problem-solving skills and the ability to work collaboratively in a fast-paced environment. Strong knowledge of APIs, MicroServices, SOA concepts, WSDL, schemas, RESTful JSON services Familiarity with monitoring tools like Kibana or Grafana for system monitoring and performance analysis. Writing and executing unit tests using JUnit to ensure code quality and reliability. Functional knowledge in the financial/banking domain is a plus.