# Software Engineer
**Role:** Software Engineer · **Level:** Software Engineer II
**Company:** [AppFolio](https://scaleengineer.com/companies/appfolio)
**Difficulty:** Medium to Hard
**Salary:** US$100000 - US$130000
**Experience:** 2 - 5
**Timeline:** ~7 days
The AppFolio Software Engineer II interview process is designed to assess a candidate's technical proficiency, problem-solving abilities, and cultural fit within the company. It typically involves multiple rounds, starting with an HR screening, followed by technical interviews focusing on data structures, algorithms, and system design, and concluding with a behavioral and managerial interview.
Canonical: https://scaleengineer.com/interviews/appfolio/software-engineer-ii-software-engineer
---
## Overall evaluation

- Technical Aptitude
- Communication and Collaboration
- Behavioral and Cultural Fit

## Questions asked

- Tell me about yourself.
- Describe a time you faced a technical challenge and how you overcame it.
- How would you design a URL shortening service?
- What are the differences between SQL and NoSQL databases?
- Explain the concept of RESTful APIs.
- How do you handle code reviews?
- Describe a situation where you had to work with a difficult colleague.
- What are your strengths and weaknesses?
- Why are you interested in AppFolio?
- Write a function to reverse a linked list.
- Given an array of integers, find the contiguous subarray with the largest sum.
- How would you optimize a slow database query?

## Preparation tips

### lists

- Review fundamental data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal).
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte, focusing on medium-difficulty problems.
- Understand common system design concepts (scalability, reliability, availability, databases, caching, load balancing).
- Prepare to discuss your past projects in detail, focusing on your contributions, challenges, and learnings.
- Research AppFolio's company culture, values, and products.
- Prepare questions to ask the interviewers about the role, team, and company.

### studyPlan

- {"title":"Data Structures and Algorithms Fundamentals","longDescription":"Weeks 1-2: Focus on core data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and their common operations and time complexities. Practice implementing these structures and solving problems involving them. Review basic algorithms like sorting (Merge Sort, Quick Sort) and searching (Binary Search).","shortDescription":"Weeks 1-2: Data Structures & Basic Algorithms. Practice implementations and problem-solving."}
- {"title":"Advanced Algorithms and System Design Concepts","longDescription":"Weeks 3-4: Dive deeper into algorithms, including dynamic programming, greedy algorithms, graph algorithms (BFS, DFS, Dijkstra's), and string manipulation. Work on medium-level problems that combine multiple concepts. Start exploring system design concepts like API design, database choices, caching strategies, and load balancing.","shortDescription":"Weeks 3-4: Advanced Algorithms & System Design Introduction. Focus on DP, graphs, and basic system design principles."}
- {"title":"System Design and Behavioral Preparation","longDescription":"Week 5: Continue practicing system design problems, focusing on scalability, reliability, and trade-offs. Prepare for behavioral questions by reflecting on your past experiences using the STAR method (Situation, Task, Action, Result). Research AppFolio's values and prepare questions.","shortDescription":"Week 5: System Design Practice & Behavioral Prep. Use STAR method for past experiences."}
- {"title":"Mock Interviews and Final Review","longDescription":"Week 6: Mock interviews, focusing on both technical and behavioral aspects. Refine your explanations and problem-solving approach. Review any areas you feel weak in based on mock interview feedback. Finalize questions to ask the interviewers.","shortDescription":"Week 6: Mock Interviews & Final Review. Simulate interview conditions and refine answers."}

## Location differences

- {"location":"Remote","differences":{"tips":["Highlight experience with remote collaboration tools.","Be prepared to discuss how you stay motivated and productive independently.","Research local tech meetups and communities to show engagement."],"interviewFocus":["Adaptability to different work environments.","Collaboration skills in a remote or hybrid setting.","Understanding of local market trends and technologies."],"commonQuestions":["Tell me about a challenging project you worked on at your previous company.","How do you handle disagreements with team members?","Describe a time you had to learn a new technology quickly. How did you approach it?"]}}
- {"location":"Santa Barbara, CA","differences":{"tips":["Tailor your answers to showcase experience with technologies heavily used in the specific office.","Emphasize your ability to contribute to an in-person team environment.","Be ready to discuss your understanding of AppFolio's product suite and its impact on the real estate industry."],"interviewFocus":["Deep dive into specific technologies relevant to the office's projects.","Understanding of on-site collaboration and team dynamics.","Familiarity with the local engineering community and talent pool."],"commonQuestions":["Describe your experience with our specific tech stack (e.g., Python, React, AWS).","How do you approach debugging complex issues in a production environment?","What are your thoughts on agile development methodologies?"]}}

## Round 1: Data Structures and Algorithms
**Type:** Technical Interview (Coding) · **Difficulty:** Medium · **Duration:** 45 min
Coding challenge focusing on data structures and algorithms.
This round focuses on your fundamental programming skills. You will be asked to solve coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to understand the problem, devise a solution, write clean and efficient code, and explain your thought process.
**Interviewers look for:** Clear and logical thinking.; Ability to translate requirements into code.; Knowledge of time and space complexity.; Clean and efficient code.
**Evaluation criteria:** Problem-solving approach; Coding proficiency; Understanding of data structures and algorithms
**Common rejection reasons:** Poor communication of thought process.; Inability to solve basic coding problems.; Lack of understanding of fundamental data structures and algorithms.
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to check if a binary tree is a valid Binary Search Tree.
- Write a function to find the first non-repeating character in a string.

## Preparation tips

- Practice coding problems on platforms like LeetCode.
- Review common data structures and algorithms.
- Be prepared to explain your code and its complexity.
- Think out loud during the interview.

## Round 2: Architecture and Scalability
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Design a scalable software system.
This round assesses your ability to design and architect software systems. You'll be given an open-ended problem, such as designing a popular web service (e.g., Twitter feed, URL shortener). The interviewer will evaluate your approach to requirements gathering, component design, data storage, scalability, and reliability.
**Interviewers look for:** Ability to design complex systems.; Understanding of distributed systems concepts.; Knowledge of various database technologies and their use cases.; Ability to handle ambiguity and make reasoned decisions.
**Evaluation criteria:** System design principles; Scalability and performance considerations; Trade-off analysis; Database knowledge; API design
**Common rejection reasons:** Inability to design scalable and reliable systems.; Poor understanding of trade-offs in system design.; Lack of clarity in explaining design choices.
## Questions

- Design a URL shortening service like bit.ly.
- How would you design a news feed system for a social media platform?
- Design an API for a ride-sharing service.

## Preparation tips

- Study system design concepts (e.g., load balancing, caching, databases, message queues).
- Read about common system design interview questions and solutions.
- Practice designing systems on paper or whiteboard.
- Be prepared to discuss trade-offs of different design choices.

## Round 3: Behavioral and Situational
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess past behavior and cultural fit using the STAR method.
This round focuses on your past experiences and how they relate to the skills and behaviors needed for success at AppFolio. You'll be asked behavioral questions using the STAR method (Situation, Task, Action, Result) to understand how you've handled various work-related scenarios.
**Interviewers look for:** Evidence of past behavior that predicts future performance.; Ability to work effectively in a team.; Proactiveness and ownership.; Alignment with company values.
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Problem-solving in past situations; Cultural alignment with AppFolio values
**Common rejection reasons:** Lack of self-awareness.; Poor examples of past behavior.; Inability to articulate contributions.; Poor cultural fit.
## Questions

- Tell me about a time you failed. What did you learn from it?
- Describe a situation where you had to influence a decision.
- How do you prioritize your work when you have multiple competing deadlines?

## Preparation tips

- Prepare specific examples from your past experience using the STAR method.
- Reflect on your strengths, weaknesses, and career goals.
- Understand AppFolio's company values and how you align with them.
- Be ready to discuss your motivations for applying.

## Round 4: Hiring Manager Discussion
**Type:** Managerial Interview · **Difficulty:** Medium · **Duration:** 30 min
Discuss career goals and team fit with the hiring manager.
This is typically the final round where you meet with the hiring manager. The focus is on understanding your career goals, how you fit within the team, and ensuring mutual alignment. It's also an opportunity for you to ask more in-depth questions about the team's projects, culture, and growth opportunities.
**Interviewers look for:** Enthusiasm for the role and company.; Clear career goals.; Ability to collaborate with the manager and team.; Good communication and interpersonal skills.
**Evaluation criteria:** Team fit; Career aspirations; Understanding of the role and responsibilities; Alignment with manager's expectations
**Common rejection reasons:** Lack of alignment with team goals.; Poor communication with management.; Unrealistic expectations.; Not a good fit for the team's dynamic.
## Questions

- What are your long-term career goals?
- How do you like to receive feedback?
- What are you looking for in your next role?

## Preparation tips

- Prepare questions about the team's projects, challenges, and culture.
- Be ready to discuss your career aspirations and how this role fits into them.
- Show enthusiasm and genuine interest in the position and AppFolio.