# Software Engineer
**Role:** Software Engineer · **Level:** Software Engineer 2
**Company:** [SoFi](https://scaleengineer.com/companies/sofi)
**Difficulty:** Medium to Hard
**Salary:** US$110000 - US$150000
**Experience:** 2 - 5
**Timeline:** ~14 days
This interview process is designed to assess candidates for a Software Engineer 2 position at SoFi. It evaluates technical skills, problem-solving abilities, cultural fit, and experience relevant to the role.
Canonical: https://scaleengineer.com/interviews/sofi/software-engineer-2-software-engineer
---
## Overall evaluation

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

## 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 design a system like Twitter's feed?
- Tell me about a time you failed and what you learned from it.
- Describe a complex bug you encountered and how you debugged it.
- What are the trade-offs between SQL and NoSQL databases?
- How do you ensure the scalability of your code?
- What is your experience with cloud platforms like AWS, Azure, or GCP?
- How do you handle code reviews?

## Preparation tips

### lists

- Review fundamental data structures and algorithms (arrays, linked lists, trees, graphs, hash maps, etc.).
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte, focusing on medium-difficulty problems.
- Understand common time and space complexity analysis (Big O notation).
- Brush up on object-oriented programming (OOP) principles.
- Prepare for system design questions, focusing on scalability, reliability, and trade-offs.
- Review your resume and be ready to discuss past projects and experiences in detail.
- Research SoFi's products, services, and company culture.
- Prepare answers to common behavioral questions using the STAR method (Situation, Task, Action, Result).
- Think about questions you want 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, Hash Tables) and basic algorithms (Sorting, Searching). Practice 2-3 problems per day. Understand time and space complexity for each.","shortDescription":"Weeks 1-2: Data Structures & Basic Algorithms. Practice 2-3 problems/day. Focus on Big O."}
- {"title":"Advanced Data Structures and Algorithms","longDescription":"Weeks 3-4: Dive into more advanced data structures (Trees, Graphs, Heaps) and algorithms (Dynamic Programming, Greedy Algorithms, Graph Traversal). Continue practicing 2-3 problems per day, increasing difficulty.","shortDescription":"Weeks 3-4: Advanced DS & Algorithms. Practice 2-3 problems/day. Increase difficulty."}
- {"title":"System Design","longDescription":"Week 5: Focus on System Design. Study common design patterns, database choices, caching strategies, load balancing, and API design. Review case studies and practice designing scalable systems.","shortDescription":"Week 5: System Design. Study patterns, databases, caching, load balancing. Review case studies."}
- {"title":"Behavioral Preparation","longDescription":"Week 6: Prepare for behavioral questions. Reflect on your past experiences and prepare STAR method answers for common questions related to teamwork, problem-solving, leadership, and challenges.","shortDescription":"Week 6: Behavioral Prep. Prepare STAR answers for teamwork, problem-solving, leadership."}
- {"title":"Final Review and Research","longDescription":"Week 7: Final review. Revisit weak areas, practice mock interviews, and research SoFi thoroughly. Prepare thoughtful questions to ask the interviewers.","shortDescription":"Week 7: Final Review. Revisit weak areas, mock interviews, research SoFi, prepare questions."}

## Location differences

- {"location":"Remote","differences":{"tips":["Research SoFi's presence and impact in this specific region.","Be prepared to discuss how your skills align with local business needs.","Highlight any experience working with diverse or distributed teams."],"interviewFocus":["Adaptability to local market trends","Understanding of regional financial regulations (if applicable)","Collaboration with local teams"],"commonQuestions":["Describe a challenging technical problem you solved at your previous company.","How do you handle disagreements within a team?","Tell me about a time you had to learn a new technology quickly."]}}
- {"location":"On-site (e.g., San Francisco, Salt Lake City)","differences":{"tips":["Emphasize your ability to collaborate effectively in person.","Be ready to share examples of successful in-office projects.","Showcase your understanding of SoFi's company culture and values."],"interviewFocus":["In-office collaboration and team dynamics","Understanding of SoFi's physical office culture","Contribution to team morale and productivity"],"commonQuestions":["How do you contribute to a positive team environment in an office setting?","Describe your experience with in-office collaboration tools.","What are your thoughts on hybrid work models?"]}}

## Round 1: Coding Challenge
**Type:** Technical Interview (Coding) · **Difficulty:** Medium · **Duration:** 45 min
Solve 1-2 coding problems focusing on data structures and algorithms. Assess problem-solving and coding skills.
This round focuses on your fundamental coding skills. You will be asked to solve 1-2 coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your approach to problem-solving and your communication skills during the process.
**Interviewers look for:** Strong grasp of data structures and algorithms.; Ability to translate a problem into code.; Clear and logical thinking.; Attention to detail in coding.
**Evaluation criteria:** Correctness of the solution; Efficiency of the solution (time and space complexity); Code readability and style; Problem-solving approach; Ability to explain the thought process
**Common rejection reasons:** Inability to solve basic coding problems.; Poor understanding of fundamental data structures.; Lack of clear communication during problem-solving.; Not asking clarifying questions.
## Questions

- Given an array of integers, return indices of the two numbers such that they add up to a specific target.
- Implement a function to check if a binary tree is a valid Binary Search Tree (BST).

## Preparation tips

- Practice coding problems on platforms like LeetCode.
- Focus on understanding the underlying data structures and algorithms.
- Practice explaining your thought process out loud.
- Write clean, well-commented code.

## Round 2: System Design
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Design a scalable system. Focus on components, trade-offs, and scalability.
This round evaluates your ability to design scalable and robust software systems. You'll be presented with a high-level problem (e.g., design a URL shortener, a social media feed, or a rate limiter) and expected to discuss various aspects of the design, including data models, APIs, component interactions, scalability considerations, and potential bottlenecks.
**Interviewers look for:** Ability to design complex systems from scratch.; Understanding of distributed systems concepts.; Knowledge of databases, caching, load balancing, etc.; Ability to think about trade-offs and make informed decisions.
**Evaluation criteria:** Scalability of the design; Reliability and fault tolerance; Choice of technologies and components; Understanding of trade-offs; Ability to handle scale and performance; Clarity of explanation
**Common rejection reasons:** Inability to design scalable and reliable systems.; Poor understanding of system components and trade-offs.; Lack of consideration for edge cases and failure scenarios.; Inability to articulate design choices clearly.
## Questions

- Design a system to shorten URLs like bit.ly.
- Design a news feed system for a social media platform.

## Preparation tips

- Study common system design patterns and concepts.
- Practice designing various types of systems.
- Understand trade-offs between different technologies.
- Be prepared to draw diagrams and explain your design choices.

## Round 3: Behavioral and Managerial Fit
**Type:** Behavioral and Managerial Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess behavioral fit, teamwork, and motivation. Use STAR method for answers.
This round focuses on your behavioral and cultural fit. The hiring manager will ask questions about your past experiences, how you handle challenges, your teamwork abilities, and your motivations. The goal is to understand how you operate, your strengths, and whether you align with SoFi's culture and values.
**Interviewers look for:** Alignment with SoFi's mission and values.; Ability to work effectively in a team.; Proactiveness and ownership.; Good communication and interpersonal skills.; Enthusiasm for the role and company.
**Evaluation criteria:** Cultural fit with SoFi's values; Teamwork and collaboration skills; Problem-solving approach in past experiences; Communication and interpersonal skills; Motivation and career goals
**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 had to deal with a difficult stakeholder.
- Describe a project you are particularly proud of and your role in it.
- How do you stay updated with new technologies?

## Preparation tips

- Prepare answers to common behavioral questions using the STAR method.
- Reflect on your strengths, weaknesses, and career goals.
- Research SoFi's mission, values, and culture.
- Be prepared to ask thoughtful questions about the team and role.