Application Developer Interview Questions

101 Questions and Answers by
William Swansen is an author, job search strategist and career advisor who assists individuals from all over the world.

Question 1 of 101

What priority do you place on security and risk avoidance when developing an application for use within the organization?

All 101 Application Developer Interview Questions

  1. Application Developer Interview Questions


    What priority do you place on security and risk avoidance when developing an application for use within the organization?

  2. 2.

    What measures do you take when developing an application to prevent it from crashing?

  3. 3.

    How do you balance developing effective and efficient application software with addressing client needs?

  4. 4.

    Can you walk me through how you migrate an application from one hardware platform to another with a different operating system?

  5. 5.

    What are some of the key differences between a web application and one designed for mobile devices?

  6. 6.

    What type of software program would you create if you were allowed to work on an application development project outside of work, and why?

  7. 7.

    Can you tell me about a recent project you worked on, sharing with me your process for developing applications?

  8. 8.

    How do you go about explaining complex technical issues to non-technical stakeholders during an application development project?

  9. 9.

    Our organization recently began incorporating HTML5 into our applications. Can you describe some of the input types that are new to HTML5?

  10. 10.

    How does the native language C or C++ understand data types in JAVA?

  11. 11.

    Can you describe Python and some of its features?

  12. 12.

    When you described Python, you mentioned dictionaries. I'm not familiar with that term. Can you elaborate on this?

  13. 13.

    Please explain how you would perform a load test.

  14. 14.

    What is the difference between Quality Assurance and Quality Control in software testing?

  15. 15.

    What are Verification and Validation, and how do they differ?

  16. 16.

    How do you define Application Software?

  17. 17.

    How do applications interact with system software?

  18. 18.

    Please desribe how you develop learning aids for the applications you develop?

  19. 19.

    What are the key steps when migrating an application from one platform to another?

  20. 20.

    Which programming languages are you mostly familiar with?

  21. 21.

    Our organization develops applications exclusively for mobile platforms, including both iOS and Android. What is your expertise in this area?

  22. 22.

    Tell me about the development methodology you employ when creating applications.

  23. 23.

    Have you ever worked on a application development project that used both an onshore and an offshore team? If so, what were some of the challenges you encountered?

  24. 24.

    What is the importance of the User Interface when developing applications?

  25. 25.

    What do you feel is the most important skill an application developer should possess?

  26. 26.

    What are you doing to keep current in technology?

  27. 27.

    How do you explain a topic such as functional programming to a person who doesn't have a technology background?

  28. 28.

    Are you familiar with APIs, and do you have experience working with them in the programs you write?

  29. 29.

    Can you describe some of the resources you use when researching a solution to a challenging programming problem?

  30. 30.

    Do you use the Agile methodology when developing applications? If so, can you discuss its advantages and disadvantages?

  31. Software Developer Interview Questions


    What method do you use to find the missing number in an integer array of 1 to 100?

  32. 32.

    Tell me how you find duplicate numbers in an array in Java containing multiple duplicates?

  33. 33.

    How do you find the starting node of a cycle if a link contains a cycle?

  34. 34.

    What software development process do you prefer to use?

  35. 35.

    I’ve heard applications referred to as both software and programs. Which terminology do you use, and how do these differ?

  36. 36.

    What are some of the types of development projects you have worked on in your past positions?

  37. 37.

    What are some of the software design patterns that you use, and in what situations do you use them?

  38. 38.

    Can you describe a challenging software development project you recently completed and the results?

  39. 39.

    Are you familiar with Agile and Waterfall? Which of these software development methodologies do you prefer?

  40. 40.

    What are some of the QA processes you are familiar with and have worked with in the past?

  41. 41.

    What are some of the testing and debugging processes you use in your software development?

  42. 42.

    How much do you know about object-oriented programming?

  43. 43.

    Explain how duplicates are removed from an array without using a library?

  44. 44.

    Based on your experience, what's the best way to find a node that begins with two single link lists?

  45. 45.

    How do you approach implementing an LRU Cache in your favorite programming language?

  46. 46.

    What is your experience with implementing a Binary Search Algorithm without recursion?

  47. 47.

    Can you walk me through the meaning behind a Depth First Search Algorithm for a binary tree?

  48. 48.

    Describe how do you implement an insertion sort algorithm, and what's the easiest way to do it?

  49. 49.

    Tell me the difference between a Comparison and Non-Comparison Sorting Algorithm?

  50. 50.

    Can you list for me the important categories of software development?

  51. 51.

    Describe at a high level what the software development life cycle process is.

  52. 52.

    What is verification and validation, and why it is important?

  53. 53.

    As a software developer, explain the meaning of debugging, and why it's used?

  54. 54.

    Do you have a preferred language that you like to write programming algorithms?

  55. 55.

    What is software scope, and what does the process involve?

  56. 56.

    How would you define software configuration management?

  57. 57.

    What is your opinion on a feasibility study, and when should it be done?

  58. 58.

    As part of software development, were you involved with working on functional and non-functional requirements?

  59. 59.

    Talk about the differences between structured English and Pseudo Code?

  60. 60.

    Making a comparison, how would you differentiate between Quality Assurance and Quality Control?

  61. Java Developer Interview Questions


    What are the key elements of the Java programming language?

  62. 62.

    Within Java, what are the differences between path and classpath variables?

  63. 63.

    Can you discuss the importance of the main() method in Java?

  64. 64.

    How is Enum used in Java?

  65. 65.

    In your opinion, Is Java Pass By Value or Pass By Reference?

  66. 66.

    Can you define the final keyword in Java?

  67. 67.

    How is a volatile keyword used in Java?

  68. 68.

    Can you discuss what a static import is and what the pitfalls of using this are?

  69. 69.

    How are access modifiers in used Java?

  70. 70.

    What is Composition, as used in Java?

  71. 71.

    Tell me about the Java Reflection API?

  72. 72.

    What is a marker interface, and how do you use it when writing Java code?

  73. 73.

    Can you tell me what a Compare and Swap algorithm is and how you use it when coding in Java?

  74. 74.

    Can you discuss the differences between a user and a daemon thread?

  75. 75.

    Talk about what a Java timer class is and how you schedule a task to run after a specific interval?

  76. 76.

    Please define a CountDownLatch in the context of Java?

  77. 77.

    How does an OutOfMemoryError impact a program written in Java, and how can this be corrected?

  78. 78.

    When programming in Java, can you have an empty catch block?

  79. 79.

    Please describe the JDBC API and discuss how it is used?

  80. 80.

    What are some examples of JDBC drivers?

  81. Python Developer Interview Questions


    Can you describe the major features of the Python programming language?

  82. 82.

    In your opinion, what are the benefits of writing code in Python?

  83. 83.

    Why is Python described as an 'Interpreted' programming language?

  84. 84.

    What is your process for tracking versions of your code?

  85. 85.

    How does Python manage memory?

  86. 86.

    What are some of the common modules that are part of Python?

  87. 87.

    What are the differences between local and global variables in Python?

  88. 88.

    Can you describe some of the type conversions used with writing code in Python?

  89. 89.

    Please walk me through the steps of installing Python on Windows.

  90. 90.

    Describe the differences between arrays and lists as Python uses them.

  91. 91.

    What tools do you use to identify bugs in your code?

  92. 92.

    Explain a Python dictionary and what it is used for.

  93. 93.

    Can you discuss Python lists and NumPy arrays, and why one is preferable to the other?

  94. 94.

    Describe the differences between deep copy and shallow copy when writing code in Python.

  95. 95.

    What are some of the common mistakes coders make when using Python?

  96. 96.

    How do you perform compiling and linking in Python?

  97. 97.

    Can you give me an example of Inheritance and describe what it is used for?

  98. 98.

    What is meant by Python supporting multiple instances of Inheritance?

  99. 99.

    Have you ever used Python to create a personal application?

  100. 100.

    What is Flask as it is used in Python, and what are some of its benefits?

  101. 101.

    What does the map function do in Python?

Application Developer Position Summary

When people think of software applications, they usually picture commercial applications from companies such as Microsoft, Google, Quicken and Oracle. However, many organizations create customized applications that either interface with common commercial applications or are customized to perform specific functions the organization needs to run their business. This creates both demand and opportunities for skilled application developers.

Application Developers work with internal and external customers to develop unique software applications and update and optimize existing applications. The Application Developer interprets users' needs to develop specific software programs for computers and mobile devices. They create programming plans, design prototype applications, implement the software, test and debug code, and troubleshoot software applications.

Successful Application Developers need to have in-depth knowledge of software engineering as well as excellent analytical skills. They also need to understand the market and client needs to develop leading-edge applications. Application developers are responsible for translating software requirements into workable programming code, maintaining applications, and develop programs for business use.

Most Application Developers specialize in a specific type of programming, such as mobile applications, business software, office productivity applications or graphics software. Depending on what they do, they will have in-depth knowledge of several computer languages and development tools.

The Application Developer role requires programmers to work both individually and as part of a team to write code and test software for issues. They often work with large companies to produce software but may also work for small start-ups or SMB firms to create specialized applications. Working in this field usually involves long hours at different points during the development process.

Application Developers are in high demand, and there are a wide variety of jobs available across various industries and organizations. According to the Bureau of Labor Statistics, Application Developer jobs are expected to grow by over 21% between 2019 to 2029, much faster than the average for all occupations.

Application Developer Duties and Responsibilities

As an Application Developer, you will design code and created functional programs and applications. You will work both collaboratively and individually. Specific responsibilities of Application Developers include:

  • Collaborating with a team of other compute and business professionals to develop specifications for new applications
  • Understanding client requirements and translating them into application features
  • Developing software applications to meet customer needs
  • Writing high-quality source code to develop specific applications
  • Designing initial prototypes according to client specifications
  • Testing and debugging code used to create applications
  • Performing integration testing before releasing or launching the software for use
  • Conducting functional and non-functional testing
  • Troubleshooting and debugging applications both before and after release
  • Evaluating existing applications to update, optimize and add new features
  • Developing technical documents to record the application design and code information
  • Creating technical handbooks to help clients use the applications

Application Developer Qualifications

Application Developers should have several years of experience working on a variety of different applications. A Bachelor's degree in a subject, such as Computer Science, Computer Programming, or Software Development, is usually required, although some companies will accept certificates from qualified training organizations. An advanced degree in these same disciplines or an MBA is preferred for individuals planning to advance to supervisor roles. Application Developers are required to have in-depth knowledge of one or more programming languages. They must be familiar with a variety of operating systems and platforms, including mobile devices. Application Developers also need to have an analytical mindset and a keen eye for detail.

Application Developers should have specific technical skills, including:

  • Proven experience as an Application Developer
  • Specific experience designing and building the types of applications they will be working on
  • Ability to program in one or more programming language such as C#, Java, Peral or Python
  • In-depth knowledge of programming for diverse operating systems and platforms
  • Good understanding of software design and programming principles and tools
  • The ability to understand client needs and develop programs to meet them
  • Knowledge of business processes or how users will employ the applications they develop
  • The ability to document their development activities and some technical writing skills

Soft Skills

In addition to the hard skills directly related to the work an Application Developer performs, you will likely be asked about several soft skills during an interview. Examples of these are:

  • Strong analytical and reasoning skills and the ability to picture processes and their outcomes
  • A knack for solving problems and developing solutions to complex issues
  • The ability to work collaboratively across the organization
  • Strong oral and written communication skills
  • Great attention to detail and time-management skills

Interview Process for the Application Developer Role

When preparing for an interview as an Application Developer, you can anticipate that the interview will occur in 3 Phases:

  • Screening
  • Phone or Video Interview
  • Onsite Interview

Each of these will involve various types of questions and some hands-on exercises.

Screening in Response to a Referral or Online Application

The initial screening is used to validate your resume and learn more about your experience, skills and background. You may also be asked about your salary expectations, availability and other employment-related issues. Finally, they will discuss the next step in the process and offer to answer any questions you may have. This takes about 15-30 minutes.

Technical Phone or Video Interview

The next step in the process is a phone or video interview. This will be more in-depth than the initial screening and explores your qualifications more extensively. This part of the interview will include several different types of questions. These include general, technical, and operational. The purpose of these questions is to explore your software application development skills and experience in more detail. You may also be asked to solve a general or specific application development challenge, either in real-time or as a take-home exercise. Usually, the interviewer will allow you to do the exercise using processes and tools you are comfortable working with. The phone or video interview will take from 1-2 hours, depending on whether there is a live application development challenge.

Onsite Interview

The onsite interview is the last phase of the interview process. This involves meeting with one or more contacts from different parts of the prospective organization. The people you interview with may include HR representatives, the Hiring Manager, Managers from other departments such as Quality, Product, Operations, Finance, and Sales, and possibly other application developers or members of the team you will be working on. Onsite interviews can last from a few hours to over several days, depending on the organization and the type of job you are interviewing for. You are likely to be asked a wide range of questions from every category. These include:

  • General - Meant to get to know you, start you talking, learn more about your background and collect information to use throughout the rest of the interview.
  • Technical - These questions explore your technical skills, knowledge and expertise. They ask about terminology, concepts, processes, and other software application development related issues.
  • Operational - Operational questions investigate how you perform your job and go about developing applications. They ask you to describe the steps you take to complete a task or to walk the interviewer through the processes you use in your job.
  • Behavioral - Behavioral questions seek to understand how you react to specific situations such as conflict, challenges, change and similar occurrences on the job site. They do this by asking about your past experiences with these types of situations.
  • Situational - Situational questions are similar to behavioral ones, except they create future scenarios to discover your methods for resolving issues. This requires you to project what you would do when confronted with a situation.
  • Cultural- These questions help the interviewer determine how well you will fit into the organization and contribute to its culture or conflict with it. Questions will explore your work style, preferences, ability to collaborate and other personal traits.

Being prepared for these types of questions and practicing your responses before the interview will help you to be ready to respond to them during the onsite phase of the interview process.

The interview typically concludes with either an immediate job offer or a brief description of how the overall interview process is being conducted and when you can expect to hear about the organization's decision. Additional steps in the process may include asking you to provide references the employer can contact or participating in online or live tests to determine your personality type, such as Myers-Briggs.