We are seeking a **Senior Backend Developer** to join our growing engineering team responsible for building enterprise\-grade, data\-driven software solutions. The ideal candidate is a backend expert who thrives in designing scalable microservices, optimizing performance, and ensuring system security across distributed environments. This role involves ownership of backend architecture, API development, database design, and integration with modern cloud infrastructures — all within a high\-impact, collaborative environment. **Key Responsibilities** **Backend Development \& Architecture** * Design, build, and maintain **microservices** using **Spring Boot** and **Java 19**, ensuring reliability, scalability, and maintainability. * Develop and integrate **RESTful** and **GraphQL** APIs for internal and external use. * Architect and implement **multi\-tenant systems**, data isolation layers, and complex authorization mechanisms. * Optimize database performance, schema design, and query efficiency in **PostgreSQL** environments. * Implement **event\-driven architecture** using AWS messaging services (SQS, SNS) or equivalent. * Contribute to system\-wide **architecture and design reviews**, proposing solutions for scalability and performance. **Security \& Compliance** * Implement and maintain **secure authentication and authorization** flows using **OAuth2**, **JWT**, and **Spring Security**. * Ensure compliance with enterprise\-grade security standards, including encryption, data privacy, and audit logging. * Establish and monitor **RBAC (Role\-Based Access Control)** and tenant\-aware data security patterns. **Performance \& Reliability** * Conduct **performance tuning**, profiling, and load testing across services. * Apply caching, asynchronous processing, and queuing patterns to handle large\-scale traffic. * Set up **observability pipelines**, including logging, monitoring, and alerting for production systems. **Collaboration \& Leadership** * Work closely with **frontend**, **DevOps**, and **product teams** to define APIs, integration flows, and release strategies. * Participate in **code reviews**, mentor mid\-level developers, and advocate for clean coding and design principles. * Contribute to continuous improvement of engineering practices, automation, and CI/CD pipelines. **Required Skills \& Qualifications** **Technical Expertise** * **5\+ years** of experience in backend software development using **Java** (preferably Java 17\+). * **3\+ years** of hands\-on experience with **Spring Boot** in production\-grade systems. * Proven track record in **microservices architecture** design and maintenance. * Proficiency in **PostgreSQL** and ORM frameworks (**JPA / Hibernate 6\.x**). * Strong background in **API design** — REST, GraphQL, OpenAPI (Swagger). * Experience with **AWS Cloud Services** (S3, SQS, SNS) and **Spring Cloud AWS** integrations. **Advanced Competencies** * Deep understanding of **multi\-tenancy architectures**, schema management, and tenant isolation. * Experience with **event\-driven systems**, message queuing, and distributed transaction patterns. * Knowledge of **Domain\-Driven Design (DDD)**, **Clean Architecture**, and enterprise integration patterns. * Familiarity with **Reactive Programming (Spring WebFlux)** and **API Gateway patterns (Spring Cloud Gateway)**. * Strong focus on **security**: OAuth2, JWT, RBAC, and encryption best practices. **Preferred Skills** * Experience with **Flyway** for database migrations. * Familiarity with **CQRS** and **event sourcing** concepts. * Exposure to **containerized environments** (Docker) and CI/CD automation (Jenkins, GitHub Actions, etc.). * Understanding of **GraphQL optimization**, schema federation, and caching strategies.