Top 5 App Developer Certification to Aim in 2023.

As an AI language model, I can provide information about popular app developer certifications, but it's important to note that the certification landscape is dynamic, and new certifications may emerge over time. Here are five app developer certifications that have been popular and widely recognized in the past:

1. AWS Certified Developer - Associate: This certification is offered by Amazon Web Services (AWS) and validates the skills and knowledge required to develop, deploy, and maintain applications on the AWS platform.
2. Google Associate Android Developer (AAD): This certification is designed for developers who create and maintain Android applications. It tests your knowledge of fundamental Android development concepts and demonstrates your proficiency in using Android development tools and APIs.
3. Microsoft Certified: Azure Developer Associate: This certification is aimed at developers who work with Microsoft Azure, a cloud computing platform. It validates your skills in designing, building, testing, and maintaining cloud-based applications using Azure technologies.
4. Salesforce Certified Platform App Builder: This certification is for professionals who design, build, and implement custom applications using the Salesforce platform. It demonstrates your expertise in creating data models, business logic, and user interfaces for Salesforce applications.
5. Oracle Certified Professional, Java SE Developer (OCP): This certification is specifically for Java developers and covers advanced Java programming, including topics such as Java I/O, concurrency, JDBC, and GUI programming. It certifies your proficiency in Java development and is widely recognized in the industry.

Remember to research and stay updated on the latest certifications available in the market, as new certifications may become relevant and popular based on emerging technologies and industry trends.