# Software Engineer I
**Role:** Software Engineer · **Level:** IC13
**Company:** [Pinterest](https://scaleengineer.com/companies/pinterest)
**Difficulty:** Medium
**Salary:** US$90000 - US$130000
**Experience:** 0 - 2
**Timeline:** ~7 days
This interview process is designed to assess candidates for the Software Engineer I (IC13) role at Pinterest. It evaluates technical skills, problem-solving abilities, cultural fit, and potential for growth within the company.
Canonical: https://scaleengineer.com/interviews/pinterest/ic13-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication
- Cultural Fit

## Questions asked

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to reverse a linked list.
- Design a URL shortening service.
- Tell me about a time you faced a technical challenge and how you overcame it.
- How would you design a system to handle real-time notifications for a social media platform?
- Describe a situation where you had to work with a difficult team member.
- What are your strengths and weaknesses as a software engineer?
- Explain the difference between a process and a thread.
- How do you approach debugging a complex issue?
- Why are you interested in working at Pinterest?

## Preparation tips

### lists

- Review fundamental data structures and algorithms (arrays, linked lists, trees, graphs, hash maps, sorting, searching).
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte, focusing on medium-difficulty problems.
- Understand common software design patterns and principles (SOLID, DRY, KISS).
- Brush up on your knowledge of operating systems, databases, and networking basics.
- Prepare to discuss your past projects in detail, focusing on your contributions, challenges, and learnings.
- Research Pinterest's products, mission, and engineering culture.
- Practice behavioral questions using the STAR method (Situation, Task, Action, Result).
- Prepare thoughtful questions to ask the interviewer 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 (quicksort, mergesort) 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 into more advanced algorithms (dynamic programming, greedy algorithms, graph traversal - BFS/DFS). Work on medium-difficulty coding problems that combine multiple data structures and algorithms. Start exploring system design concepts like scalability, availability, and common architectural patterns.","shortDescription":"Weeks 3-4: Advanced Algorithms & System Design Intro. Solve medium coding problems and learn system design basics."}
- {"title":"Behavioral Interview Preparation","longDescription":"Week 5: Focus on behavioral preparation. Reflect on your past experiences and prepare stories using the STAR method for common behavioral questions related to teamwork, problem-solving, conflict resolution, and leadership. Research Pinterest's values and prepare examples that demonstrate alignment.","shortDescription":"Week 5: Behavioral Preparation. Use STAR method for common questions and align with Pinterest values."}
- {"title":"Mock Interviews and Final Review","longDescription":"Week 6: Practice mock interviews, both technical and behavioral. Simulate the interview environment to get comfortable with the pressure and time constraints. Seek feedback from peers or mentors. Review any areas you feel weak in based on mock interview performance.","shortDescription":"Week 6: Mock Interviews and Review. Simulate interviews and get feedback."}

## Location differences

- {"location":"Pinterest Headquarters (San Francisco)","differences":{"tips":["Research recent Pinterest product launches and company news.","Be prepared to discuss how your skills align with Pinterest's engineering challenges.","Showcase your passion for the Pinterest platform."],"interviewFocus":["Understanding of Pinterest's specific product and user base.","Ability to contribute to a fast-paced, collaborative environment.","Alignment with Pinterest's company values and mission."],"commonQuestions":["Tell me about a challenging project you worked on at Pinterest.","How do you handle disagreements within a team at Pinterest?","What are your thoughts on Pinterest's approach to data privacy?"]}}
- {"location":"Remote","differences":{"tips":["Highlight your experience with remote work tools and methodologies.","Be ready to discuss your strategies for staying connected and productive remotely.","Emphasize your proactive approach to learning and problem-solving."],"interviewFocus":["Remote collaboration and communication skills.","Self-motivation and ability to work independently.","Adaptability to different work environments."],"commonQuestions":["Describe a time you had to adapt to a new technology stack at Pinterest.","How do you prioritize tasks when working remotely for Pinterest?","What are your expectations for career development at Pinterest?"]}}

## Round 1: Coding Challenge
**Type:** Technical Coding Interview · **Difficulty:** Medium · **Duration:** 45 min
Solve 1-2 coding problems focusing on data structures and algorithms.
This round focuses on your core programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to understand the problem, devise an efficient solution, write clean code, and explain your thought process clearly. Expect questions that test your knowledge of arrays, strings, linked lists, trees, graphs, and common algorithms.
**Interviewers look for:** Ability to translate a problem into code.; Understanding of time and space complexity.; Clean and maintainable code.; Logical thinking and systematic approach to problem-solving.
**Evaluation criteria:** Correctness of the solution; Efficiency of the solution (time and space complexity); Code quality and readability; Problem-solving approach; Communication of thought process
**Common rejection reasons:** Inability to solve coding problems within the given time.; Poor understanding of fundamental data structures and algorithms.; Lack of clarity in explaining the thought process.; Code that is inefficient or contains bugs.
## Questions

- Given a binary tree, determine if it is a valid binary search tree.
- Find the kth smallest element in an unsorted array.
- Implement a function to check if a string is a palindrome, ignoring non-alphanumeric characters and case.

## Preparation tips

- Practice coding problems on platforms like LeetCode, focusing on 'Easy' and 'Medium' difficulties.
- Be comfortable explaining your approach before you start coding.
- Write clean, well-commented code.
- Test your code with edge cases.
- Understand the time and space complexity of your solutions.

## Round 2: System Design
**Type:** System Design Interview · **Difficulty:** Medium · **Duration:** 60 min
Design a scalable system, discussing trade-offs and components.
This round assesses your ability to design and architect software systems. You'll be given an open-ended problem, such as designing a specific feature or a large-scale system (e.g., a news feed, a URL shortener, a chat application). The interviewer will evaluate your ability to gather requirements, propose a high-level design, discuss trade-offs, and dive deeper into specific components. Focus on scalability, reliability, and maintainability.
**Interviewers look for:** Structured approach to problem-solving.; Ability to break down complex problems.; Knowledge of common system design patterns.; Understanding of scalability, availability, and performance.; Effective communication of design choices.
**Evaluation criteria:** Ability to design scalable and reliable systems.; Understanding of trade-offs in design decisions.; Knowledge of distributed systems concepts.; Clarity and structure of the design.; Consideration of various system components (databases, caching, load balancing, APIs).
**Common rejection reasons:** Lack of understanding of system design principles.; Inability to handle scale or distributed systems concepts.; Poor trade-off analysis.; Not considering edge cases or failure scenarios.
## Questions

- Design a system like Twitter's feed.
- Design a rate limiter.
- How would you design a system to store and retrieve user profiles efficiently?

## Preparation tips

- Study common system design concepts (load balancing, caching, databases, message queues, APIs).
- Review popular system design case studies.
- Practice designing systems by drawing diagrams and explaining your choices.
- Be prepared to discuss trade-offs between different approaches.
- Consider potential bottlenecks and failure points.

## Round 3: Behavioral and Managerial Fit
**Type:** Behavioral and Hiring Manager Interview · **Difficulty:** Easy · **Duration:** 30 min
Discuss past experiences, teamwork, and cultural fit using the STAR method.
This round, often conducted by the hiring manager or a recruiter, focuses on your behavioral and cultural fit. You'll be asked questions about your past experiences, teamwork, problem-solving approaches in non-technical contexts, and your motivations for joining Pinterest. The goal is to understand how you work, how you collaborate, and whether you align with the company's culture and values. Prepare to share specific examples using the STAR method.
**Interviewers look for:** Alignment with Pinterest's mission and values.; Ability to collaborate effectively.; Self-awareness and reflection.; Passion for technology and the product.; Potential for growth within the company.
**Evaluation criteria:** Cultural fit with Pinterest's values.; Communication and interpersonal skills.; Motivation and enthusiasm for the role and company.; Past experiences and learnings.; Career aspirations.
**Common rejection reasons:** Lack of alignment with company values.; Poor communication or interpersonal skills.; Inability to provide specific examples for behavioral questions.; Negative attitude or lack of enthusiasm.; Unrealistic salary expectations.
## Questions

- Tell me about a time you failed and what you learned from it.
- Describe a situation where you had to persuade a team member to adopt your idea.
- Why are you interested in Pinterest?
- How do you handle constructive criticism?

## Preparation tips

- Review Pinterest's mission, values, and culture.
- Prepare examples using the STAR method for common behavioral questions (teamwork, conflict, challenges, successes).
- Be ready to discuss your career goals and why Pinterest is a good fit.
- Show enthusiasm and genuine interest in the role and company.
- Prepare thoughtful questions to ask the interviewer.