AWS Certification Path for a backend Engineer:
1. AWS Certified Cloud Practitioner: This exam is intended for individuals who have a general understanding of the AWS Cloud. It covers topics such as AWS services, security, and billing.
2. AWS Certified Developer Associate: This certification validates your skills and knowledge of developing and maintaining applications on the AWS platform. It covers topics such as writing cloud optimised code, developing secure and scalable applications, and using AWS services to build and deploy applications.
3. AWS Certified Solutions Architect Associate: It covers a broad range of knowledge and skills that are needed to design and deploy scalable and resilient systems on the AWS platform.
4. AWS Certified SysOps Administrator Associate: This certification focuses on the operation and management of systems on the AWS platform.

Ultimately, the best certification for you will depend on your specific goals and experience.