Here’s a refined job posting based on the tech stack and responsibilities provided:
We are seeking an experienced Full-Stack Developer with expertise in Java 8+, Spring Boot, Hibernate, ReactJS, and PostgreSQL. The ideal candidate will also have a strong grasp of cloud-based solutions, especially in AWS and its services, along with security best practices for modern web applications.
Key Responsibilities:

    Backend Development: Design, develop, and optimize microservices using Java 8+, Spring Boot, and Hibernate.
    Frontend Development: Build and maintain dynamic and responsive web applications using ReactJS.
    Database Management: Utilize PostgreSQL to design and manage scalable databases with a focus on performance optimization.
    Cloud Integration: Implement cloud-based solutions using AWS services like SNS, AWS Cognito, and handle authentication via OAuth 2.0 and JWT tokens.
    Code Review and Improvement: Conduct thorough code reviews focusing on time and space complexity and improve existing solutions.
    CI/CD Pipelines & DevOps: Set up and manage CI/CD pipelines, using tools such as Git Actions, and incorporate security best practices.
    Payment Systems: Integrate and manage payment systems such as Stripe.
    Messaging Systems: Implement and maintain message brokers like RabbitMQ.
    Telemetry and Error Handling: Build telemetry logging solutions for error detection, tracing, and system observability.

Required Skills:

    Java 8+, Spring Boot, Hibernate for backend development
    ReactJS for frontend development
    Strong understanding of AWS Cognito, OAuth 2.0, and JWT tokens for authentication
    Knowledge of CI/CD pipelines, Git Actions, and cloud-based development practices
    Hands-on experience with Stripe, RabbitMQ, and AWS SNS
    Familiarity with Microservices architecture, Telemetry Logging, and Error Handling
    Solid understanding of time and space complexity, with a demonstrated ability to improve code performance

If you have a proven track record of building secure, scalable applications using this tech stack, we’d love to hear from you!