# Software Engineer
**Role:** Software Engineer · **Level:** L3
**Company:** [Gusto](https://scaleengineer.com/companies/gusto)
**Difficulty:** Medium
**Salary:** US$90000 - US$120000
**Experience:** 1 - 3
**Timeline:** ~14 days
Gusto's Software Engineer L3 interview process is designed to assess a candidate's technical proficiency, problem-solving skills, and cultural fit within the company. The process typically involves multiple rounds, including initial screening, technical interviews, and a final managerial or team-fit interview.
Canonical: https://scaleengineer.com/interviews/gusto/l3-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication & Culture Fit
- Behavioral Attributes

## Questions asked

- Write a function to reverse a linked list.
- Given an array of integers, find the two numbers that add up to a specific target.
- Design a URL shortening service.
- How would you handle a production issue that is impacting users?
- Tell me about a time you received constructive criticism and how you acted on it.
- What interests you about working at Gusto?
- Describe a situation where you had to work with a difficult team member.

## Preparation tips

### lists

- Review fundamental data structures and algorithms.
- Practice coding problems on platforms like LeetCode or HackerRank.
- Understand core computer science concepts (e.g., operating systems, databases, networking).
- Prepare to discuss your past projects and contributions in detail.
- Research Gusto's mission, values, and products.
- Prepare questions to ask the interviewer about the role, team, and company.
- Practice behavioral questions using the STAR method (Situation, Task, Action, Result).

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and their common algorithms (sorting, searching, graph traversal). Practice implementing these from scratch and analyze their time and space complexity. Cover fundamental algorithms like dynamic programming and greedy algorithms.","shortDescription":"Weeks 1-2: Data Structures & Algorithms fundamentals. Practice implementations and complexity analysis."}
- {"title":"System Design Fundamentals","longDescription":"Weeks 3-4: Dive into system design concepts. Understand scalability, reliability, and availability. Learn about common architectural patterns (e.g., microservices, monolithic), databases (SQL vs. NoSQL), caching strategies, and load balancing. Practice designing simple systems.","shortDescription":"Weeks 3-4: System Design basics. Focus on scalability, databases, and architectural patterns."}
- {"title":"Behavioral and Cultural Fit","longDescription":"Week 5: Prepare for behavioral and situational questions. Reflect on past experiences related to teamwork, problem-solving, conflict resolution, and leadership. Use the STAR method to structure your answers. Research Gusto's values and prepare examples that align with them.","shortDescription":"Week 5: Behavioral preparation. Practice STAR method and align answers with Gusto's values."}

## Location differences

- {"location":"Remote","differences":{"tips":["Highlight experience with remote collaboration tools.","Be prepared to discuss how you stay connected and productive in a distributed team.","Research common tech stacks and challenges relevant to the specific office location."],"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 within a team?","Describe a time you had to learn a new technology quickly."]}}
- {"location":"On-site","differences":{"tips":["Emphasize your ability to collaborate effectively in person.","Share examples of how you've positively impacted team dynamics in an office setting.","Be ready to discuss your understanding of Gusto's office culture and values."],"interviewFocus":["Teamwork and in-person collaboration.","Understanding of office-specific workflows.","Contribution to company culture and events."],"commonQuestions":["Describe your experience working in an office environment.","How do you contribute to team morale and company culture?","What are your thoughts on in-office collaboration versus remote work?"]}}

## Round 1: Coding and Algorithms Assessment
**Type:** Technical Interview - Coding · **Difficulty:** Medium · **Duration:** 45 min
Assess coding skills and problem-solving with data structures and algorithms.
This round focuses on assessing your core coding abilities and problem-solving skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will evaluate your approach, the efficiency of your solution, and your ability to write clean, working code. Expect to explain your thought process throughout the problem-solving exercise.
**Interviewers look for:** Clean and efficient code.; Logical problem-solving steps.; Ability to explain the solution and its trade-offs.
**Evaluation criteria:** Coding proficiency; Problem-solving approach; Understanding of time and space complexity
**Common rejection reasons:** Inability to articulate thought process clearly.; Lack of fundamental coding skills.; Poor understanding of basic data structures and algorithms.
## Questions

- Given a binary tree, determine if it is a valid binary search tree.
- Implement a function to find the kth smallest element in an unsorted array.

## Preparation tips

- Practice coding on a whiteboard or a shared editor.
- Think out loud and explain your approach before coding.
- Test your code with edge cases.
- Be prepared to discuss the time and space complexity of your solution.

## Round 2: System Design and Architecture
**Type:** Technical Interview - System Design · **Difficulty:** Medium · **Duration:** 60 min
Assess system design capabilities and architectural thinking.
This round evaluates your ability to design and architect software systems. You'll be presented with a high-level problem (e.g., design a social media feed, a URL shortener) and expected to discuss various aspects of the design, including data models, APIs, scalability, and potential bottlenecks. The focus is on your understanding of system design principles and your ability to make informed trade-offs.
**Interviewers look for:** Ability to design robust and scalable systems.; Clear communication of design choices.; Consideration of various system components and their interactions.
**Evaluation criteria:** System design principles; Scalability and performance considerations; Trade-off analysis; Understanding of databases and caching
**Common rejection reasons:** Inability to design scalable and reliable systems.; Lack of understanding of distributed systems concepts.; Poor trade-off analysis in design choices.
## Questions

- Design a system to count unique visitors to a website.
- How would you design a rate limiter for an API?

## Preparation tips

- Study common system design patterns and architectures.
- Understand database choices (SQL vs. NoSQL) and their implications.
- Learn about caching strategies and load balancing.
- Practice designing systems and articulating your choices.
- Consider edge cases and failure scenarios.

## Round 3: Behavioral and Cultural Fit Interview
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess behavioral competencies and cultural fit using past experiences.
This interview focuses on your past experiences and how they relate to the skills and behaviors required for the role. You'll be asked behavioral questions that prompt you to share specific examples of how you've handled various situations. The goal is to understand your work style, your ability to collaborate, and how you align with Gusto's culture.
**Interviewers look for:** Evidence of past behavior that predicts future performance.; Strong communication and interpersonal skills.; Enthusiasm and a positive attitude.; Alignment with Gusto's core values.
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration; Problem-solving in past situations; Cultural alignment with Gusto's values
**Common rejection reasons:** Poor communication skills.; Lack of alignment with company values.; Inability to provide specific examples of past behavior.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you failed and what you learned 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 examples using the STAR method (Situation, Task, Action, Result).
- Be ready to discuss your strengths and weaknesses.
- Reflect on your career goals and why you're interested in Gusto.
- Show enthusiasm and genuine interest in the role and company.