Backend development is the process of creating the server side of an application, responsible for managing and storing data, performing business logic, and handling client-server communication. To be a successful backend developer, one must possess a combination of technical and non-technical skills. Here are some of the key skills that are necessary for a career in backend development:

1. Programming languages: Backend developers typically use programming languages such as Python, Java, Ruby, C#, and JavaScript to build the server side of an application. It is important for a backend developer to be proficient in at least one of these languages, as well as have knowledge of their associated frameworks and libraries.

2. Database management: Backend developers often work with databases, such as MySQL, MongoDB, or PostgreSQL, to store and manage data. Knowledge of database design and querying languages, such as SQL, is essential for a backend developer. Additionally, knowledge of NoSQL databases and how to interact with them via a programming language is also a plus.

3. Server-side technologies: Backend developers should be familiar with server-side technologies such as Apache, Nginx, and IIS, which are responsible for handling client-server communication and serving dynamic content to the client. Additionally, an understanding of cloud-based solutions such as AWS, Azure, and GCP is also very much beneficial.

4. Web protocols and standards: Backend developers should have a strong understanding of web protocols, such as HTTP and HTTPS, as well as industry standards, such as REST and SOAP, which govern client-server communication. Familiarity with web architecture, including the request/response cycle, and how web browsers interact with servers is also important.

5. Technical problem-solving: Backend development often involves resolving technical issues that arise during the development process. Strong problem-solving skills are essential for a backend developer, as they will be responsible for identifying and resolving bugs, as well as optimizing performance.

6. Serverless Architecture: With the increasing popularity of serverless architecture, it is important for backend developers to know how to create and manage serverless functions. This knowledge can come in handy in creating performant microservices, or using the serverless offerings provided by cloud providers.

7. Agile development methodologies: Backend development typically involves working in a team, and knowledge of Agile development methodologies, such as Scrum, can be beneficial for collaborating with other developers and meeting project deadlines.

8. Communication skills: Although backend development is primarily a technical field, strong communication skills are also essential for success. Backend developers often work with designers, front-end developers, and stakeholders, and need to be able to communicate technical concepts and ideas to non-technical team members.

9. Git and Version Control: Knowledge of Git and Version Control Systems, such as SVN, is a must-have for any developer. It allows developers to keep track of changes in the code, collaborate with other developers, and roll back if needed.

10. Familiarity with Containerization and Orchestration: Containerization and orchestration technologies such as Docker, Kubernetes, and Mesos is an essential skill for backend developers to efficiently run and manage their applications.

These are some of the core skills that are necessary for a career in backend development. As the field is constantly evolving, it is important for backend developers to keep learning and stay up-to-date with the latest technologies and industry trends.