Mainframe Developer Interview Preparation

Top 15 Mainframe Developer Interview Questions and Answers

If you're an aspiring mainframe developer, chances are high that you'll have to face a technical interview. Are you prepared? To help you ace your interview, we have compiled a list of the top 15 mainframe developer interview questions and answers.

1. What is a mainframe?

A mainframe is a large and powerful computer system that's designed to process data-intensive enterprise applications.

2. What are the key features of a mainframe?

Key features of a mainframe include reliability, security, scalability, and high-performance computing.

3. What programming languages are commonly used for mainframe development?

Cobol, Assembler, PL/I, and JCL (Job Control Language) are some of the most common programming languages used for mainframe development.

4. What are some of the tools that a mainframe developer typically uses?

Mainframe developers typically use tools such as IBM's z/OS, CICS, DB2, IMS, and TSO/ISPF.

5. What is COBOL?

COBOL (Common Business Oriented Language) is a high-level programming language that's mainly used for business applications.

6. What is JCL?

JCL (Job Control Language) is a scripting language used for submitting mainframe batch jobs. It's used to define job steps and control statements such as input/output, file allocation, and parameters.

7. What is CICS?

CICS (Customer Information Control System) is a transaction processing system software that runs on a mainframe. It's used to process data in real-time for online transaction processing applications.

8. What is DB2?

DB2 is a Relational Database Management System (RDBMS) used primarily for mainframe applications. It provides high-performance data management, reliability, and scalability.

9. What is IMS?

IMS (Information Management System) is a hierarchical database management system that's used for processing transactions and managing data on a mainframe.

10. What is a batch job?

A batch job is a set of computer instructions that's executed in the background without any operator intervention. Batch jobs are typically used for processing large amounts of data overnight or during off-peak hours.

11. What is TSO/ISPF?

TSO (Time Sharing Option) and ISPF (Interactive System Productivity Facility) are software tools used for interacting with IBM's z/OS operating system. They provide editors, utilities, and other features for mainframe development.

12. What are some of the challenges of mainframe development?

The challenges of mainframe development include a shortage of experienced developers, the complexity of legacy code, and the need for continuous modernization and integration with new technologies.

13. What are some of the benefits of mainframe development?

Mainframe development provides benefits such as high-performance computing, reliability, security, and scalability for processing data-intensive enterprise applications.

14. What is debugging?

Debugging refers to the process of finding and resolving errors or problems in computer programs. Mainframe developers use debugging tools such as debugging monitors and trace facilities to identify and fix issues.

15. What are some best practices for mainframe development?

Best practices for mainframe development include writing modular and reusable code, properly documenting code and procedures, following coding standards, testing thoroughly before deployment, and continuously learning and adapting to new technologies.

By preparing for these interview questions, you can impress your potential employer with your knowledge and expertise in mainframe development.

How to Prepare for Mainframe Developer Interview

Introduction

Mainframe developers are responsible for developing and maintaining applications on large scale computers called mainframes. If you've landed an interview for a mainframe developer role, it's important to prepare thoroughly to showcase your expertise in the field. Here are some tips to help you prepare for your mainframe developer interview:

1. Brush up on Your Technical Knowledge

• Review basic coding concepts such as COBOL, JCL, CICS, and IMS.
• Practice coding exercises and problem-solving questions.
• Read up on the latest technologies and trends in the mainframe industry.

2. Be Prepared to Answer Behavioral Questions

• Expect to be asked questions about how you handle difficult situations, your communication skills, and how you work on a team.
• Prepare for questions about your experience working with mainframes, your technical strengths and weaknesses, and your favorite and least favorite projects.

3. Research the Company and the Role

• Study the company's website and any recent news or press releases.
• Learn about the company culture, mission, and values.
• Research the specific role you're applying for and its requirements.

4. Dress Professionally and Arrive Early

• Dress professionally, even if the company typically has a casual dress code.
• Arrive 10-15 minutes early to give yourself time to find the interview location and mentally prepare.

5. Prepare Questions to Ask the Interviewer

• Craft thoughtful, relevant questions about the company, the role, and day to day responsibilities.
• Ask about opportunities for growth and advancement, company values and culture, and what a typical workday looks like.

Conclusion

By taking the time to prepare thoroughly for your mainframe developer interview, you'll increase your chances of impressing the interviewer and landing the job. Brush up on your technical knowledge, be prepared to answer behavioral questions, research the company and role, dress professionally, arrive early, and prepare questions to ask the interviewer. Good luck!