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How To Hire An App Developer

An app developer is a professional, responsible for creating software applications for mobile devices or computers. They tackle challenges such as optimizing code for performance, ensuring seamless user experiences, addressing compatibility issues across devices, and integrating complex functionalities. The history of app development traces back to the launch of the first mobile applications in the early 2000s. The introduction of Apple's App Store in 2008 marked a transformative moment, democratizing app creation and distribution. Over the years, the evolution of app development frameworks, such as Flutter and React Native, streamlined cross-platform development. Continuous advancements in technologies like augmented reality (AR) and machine learning have further expanded the possibilities for app developers.

App Developers: Why are they needed?

App developers are essential due to the ubiquity of smartphones and the increasing reliance on digital platforms. Their expertise is crucial for designing, building, and maintaining applications that cater to diverse needs, spanning from communication and productivity to entertainment and business solutions. Virtually every industry, from tech giants like Google, Apple, and Microsoft to startups requires app developers to create and maintain digital interfaces. The growing reliance on software-driven solutions ensure a continuous demand for skilled app developers.

Skills required

  • Swift, Kotlin/Java
  • iOS SDK, Android SDK
  • UI/UX design principles
  • React Native, Xamarin
  • RESTful APIs
  • Database management
  • Debugging

Job titles

  • Mobile App Developer
  • Android Developer
  • iOS Developer
  • UI/UX Designer
  • Front-end Developer
  • Back-end Developer
  • Full-stack Developer

App Developer Assessment

The most common assessment framework for App Developers on HackerEarth includes

A combination of technical evaluations, coding exercises, and behavioral assessments. Here are some common components of the assessment framework:

Code completion tasks

Code completion tasks are crucial to find App developer with good programming proficiency. These tasks test a developer's knowledge of language constructs, libraries, and API usage, reflecting real-world scenarios. For instance, assessing a candidate's ability to complete a function that manipulates data within a specific framework or integrating a third-party library to achieve a certain functionality.

Multiple-choice questions (MCQs)

Multiple-choice questions (MCQs) are a crucial part of app developer hiring assessment. For instance, an MCQ might probe a candidate's familiarity with common design patterns or ask about the nuances of memory management in mobile development. Topics covered can span mobile platforms, user interface design principles, and security best practices. MCQs can help you hire skilled developers by providing a quick yet comprehensive overview of a candidate's theoretical foundation in app development.

Project-specific questions

Project-specific questions enhance the hiring process by aligning assessments with the challenges developers may encounter in the role. For example, you can ask how a developer handled data synchronization in a mobile app with intermittent connectivity or inquire about their strategy for optimizing app performance in resource-constrained environments. These questions not only showcase a candidate's technical prowess but also provide a deeper understanding of their decision-making process.

Language-specific questions

Language-specific questions can help assess a candidate's proficiency in programming languages relevant to their target platforms (e.g., Java or Kotlin for Android, Swift or Objective-C for iOS). These questions delve into language-specific intricacies, such as memory management, threading, and platform-specific APIs. This focused assessment facilitates a more accurate evaluation and informed hiring decisions.

Our bias-free, objective platform has facilitated 1,00,000+ assessments

Steps to Create an App Developer Assessment on HackerEarth

  1. Log in to Hackerearth assessments
  2. Add questions from our library and create a test
  3. Send invites to candidates
  4. Evaluate our AI-assisted report and shortlist candidates

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Sample Questions to Ask an App Developer

  • Implement a function in your preferred programming language to efficiently handle background tasks in a mobile app, ensuring optimal performance.
  • Design and code a user-friendly interface for a weather app, utilizing appropriate frameworks for both iOS and Android platforms.
  • Discuss your approach to optimizing app loading times and reducing latency in a network-intensive application.
  • Demonstrate your proficiency in integrating third-party APIs by creating a feature that fetches real-time data (e.g., weather updates) and displays it dynamically within the app.

  • Which framework allows for cross-platform mobile app development using a single codebase?
    1. Swift
    2. Kotlin
    3. React Native
    4. Objective-C

  • Which type of database is commonly used for mobile app development due to its lightweight nature?
    1. MongoDB
    2. MySQL
    3. SQLite
    4. Oracle

  • What is an essential measure to enhance the security of user data in a mobile app?
    1. Storing passwords in plaintext
    2. Implementing HTTPS for communication
    3. Sharing sensitive data via unsecured channels
    4. Using the same encryption key for all users

  • Outline your approach to designing effective test cases for a complex mobile app, considering both functional and non-functional requirements.
  • Describe a scenario where you successfully identified and mitigated a critical bug during the testing phase, illustrating your problem-solving skills and attention to detail.
  • Explain your strategy for conducting performance testing on mobile apps, emphasizing the key performance metrics you monitor and actions taken to optimize app responsiveness.

  • Share your approach to designing adaptive and responsive UI elements to accommodate various screen sizes and orientations in both iOS and Android platforms.
  • Provide insights into your approach for creating a seamless and aesthetically pleasing onboarding experience for users, ensuring a positive first impression of the app.
  • Elaborate on your experience with prototyping tools (e.g., Figma, Sketch, Adobe XD) and how you leverage them to communicate design concepts and interactions effectively.

These sample questions provided here are for interviewing early-experience talents. For more customized assessments for candidates with higher experience, you can contact our team at or request a demo here.

Guidelines for Writing Job Description for App Developers

Job title

A well-formulated job title might be "Mobile App Developer" or "iOS/Android App Developer," depending on the specific platforms involved. This not only provides clarity to applicants about the primary focus of the role but also enhances the visibility of the job posting in relevant searches. It helps in effectively communicating the nature of the position. Thus enabling you to find an app developer with the right skillset.

Job summary

A well crafted job summary in an app developer job description can help convey essential responsibilities and expectations. It sets clear expectations, ensuring that individuals with the requisite app development expertise are willing to delve into the detailed job description. Ultimately facilitating a more targeted and successful hire.


Outline the specific tasks and responsibilities that the App developer will be expected to handle. This may include:

  • Design and develop high-quality mobile applications for iOS and Android platforms.
  • Collaborate with cross-functional teams to define, design, and ship new features.
  • Conduct thorough code reviews and ensure adherence to coding standards.
  • Troubleshoot, debug, and optimize applications for performance and user experience.
  • Collaborate with UI/UX designers to ensure seamless integration of user interfaces.
  • Work closely with product managers to understand project requirements and deliver solutions that meet business objectives.

Clearly outlined roles will help you hire app developer who has a comprehensive understanding of the position's demands beforehand. It also allows potential candidates to assess their alignment with the role. Therefore, it becomes a very crucial part of the app developer job description.

Skills and qualifications

List the essential App developer skills and qualifications that candidates must possess, including, but not restricted to:

  • Proficient in mobile app development for iOS and Android platforms.
  • Strong experience with programming languages such as Swift (for iOS) and Kotlin/Java (for Android).
  • In-depth knowledge of mobile UI/UX design principles and best practices.
  • Expertise in debugging, optimizing, and troubleshooting mobile applications.
  • Ability to collaborate effectively with cross-functional teams.
  • Experience with Agile/Scrum development methodologies.

By outlining the essential skills in the job description will help you swiftly identify and hire app developer with the precise expertise required for the role.

Preferred skills

Mention any additional App developer skills or qualifications that would be beneficial but not mandatory for the role. You can also ask for experience with specific tools, libraries, or frameworks.

Education and experience

Clearly outlining the desired qualifications ensures that potential candidates understand the baseline criteria for the role. By specifying educational backgrounds and experience levels, the job description acts as a filter. It enables you to identify and hire App developer whose skills align closely with the demands of the position.

Company culture and EVPs

Briefly highlight your company's culture, values, and any unique perks or benefits offered to employees that can help attract candidates who align with your company's ethos.

Application instructions

Provide instructions on how candidates can apply for the position. Include where to send their resume, portfolio, or other required documents. Also, specify the deadline for applications, if applicable.

Equal Opportunity Statement

Include a statement affirming that your company is an equal opportunity employer committed to diversity and inclusion.

You can incorporate gender-neutral pronouns like 'they/them' to promote an inclusive workplace. Additionally, it's beneficial to align your developer personas with your job profiles before advertising an open position. This approach ensures that your job descriptions resonate with a diverse range of candidates.

Download our guide for writing better developer personas

How to Conduct App Developer Job Interview

In skill-first hiring, the interview process should be tailored to assess the candidate's expertise and experience within the specific domain. Therefore, when conducting a face-to-face interview with an App Developer, the following guidelines can be considered:

Conduct a real-time technical assessment

During the App developer hiring assessment, candidates are usually given a remote assessment before the interview. However, using the interview platform to assess skills in real time will tell you a lot about the candidate’s communication skills and thought process.

HackerEarth's premier tech interview platform, FaceCode, integrates a comprehensive question library designed for evaluating a candidate's proficiency in essential app development concepts. Incorporating pair-programming methodologies during the interview provides valuable insights into the candidate's problem-solving aptitude, logical reasoning, and meticulous attention to detail. This approach to technical assessments on FaceCode ensures a rigorous evaluation, facilitating informed hiring decisions for top-tier app developers.

Understand the candidate’s project experience and review the portfolio

During the App developer interview assessment, explore the candidate's past and present projects. Encourage the candidate to elaborate on a specific App development project, elucidating their responsibilities, approach to problem-solving, and collaboration within the team. If accessible, examine their portfolio or code samples to evaluate coding style, documentation practices, and overall project quality. This approach ensures a thorough understanding of the candidate's practical experience and capabilities.

Understand if they are a good culture and team fit

While technical expertise is imperative for an App developer interview assessment, the importance of cultural fit should not be underestimated. An ideal candidate should not only demonstrate precise coding skills but also exhibit effective communication and collaboration abilities essential for thriving in agile and team-oriented settings. It is pivotal to evaluate a candidate's capacity to work autonomously and as part of a team during this assessment. This comprehensive approach provides valuable insights into the candidate's problem-solving acumen, communication proficiency, and adaptability, aiding in the decision-making process to hire the right candidate.

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When seeking an app developer, prioritize a strong foundation in relevant programming languages, expertise in mobile app development frameworks like Flutter or React Native, proficiency in version control systems such as Git, and experience with UI/UX design integration. Adept problem-solving skills, a keen eye for detail, and the ability to collaborate within an agile development environment are vital.

While comprehensive experience in all necessary tools is advantageous, a qualified app developer should possess proficiency in at least one key mobile development framework (e.g., Flutter or React Native). Adeptness in version control systems like Git, familiarity with UI/UX design principles, and the ability to troubleshoot and optimize app performance are also crucial.

An Android developer must possess strong proficiency in Java or Kotlin, with a deep understanding of Android Studio and the Android SDK. Solid knowledge of UI/UX principles, familiarity with RESTful APIs, and expertise in handling various screen sizes and resolutions are crucial. Effective problem-solving skills, adeptness in version control systems like Git, and a commitment to staying updated on Android trends contribute to a well-rounded skill set.

To evaluate an app developer's real-world project-handling skills, assess their portfolio for diversity, complexity, and relevance. Examine the range of projects undertaken, focusing on their contributions, problem-solving approach, and the technologies employed. Request detailed explanations of their role in each project, seeking insights into decision-making, code structure, and adaptability to project requirements. In interviews, pose scenario-based questions to gauge their problem-solving acumen and ability to troubleshoot. Request code samples, emphasizing readability, scalability, and adherence to best practices.

The demand for app developer skills varies across job roles, with specific nuances tailored to the position. A frontend app developer may prioritize expertise in UI/UX design and frontend frameworks, while a backend developer emphasizes server-side technologies and database management. A mobile app developer's focus lies in cross-platform development, requiring proficiency in frameworks like Flutter or React Native. Full-stack app developers must balance both frontend and backend proficiencies. System architects prioritize a holistic understanding of app architecture.