# Software Engineer
**Role:** Software Engineer · **Level:** GL27
**Company:** [Optum](https://scaleengineer.com/companies/optum)
**Difficulty:** Medium to Hard
**Salary:** US$110000 - US$140000
**Experience:** 2 - 5
**Timeline:** ~10 days
This interview process is for a Software Engineer position at Optum, specifically for the GL27 level. It is designed to assess a candidate's technical skills, problem-solving abilities, and cultural fit within the organization.
Canonical: https://scaleengineer.com/interviews/optum/gl27-software-engineer
---
## Overall evaluation

- Technical Skills
- System Design & Architecture
- Behavioral & Cultural Fit

## Questions asked

- Given an array of integers, find the contiguous subarray with the largest sum.
- Design a URL shortening service like bit.ly.
- Tell me about a time you disagreed with a team member. How did you resolve it?
- How would you design a system to handle millions of concurrent users for a social media platform?
- Explain the difference between processes and threads.
- Describe a situation where you had to meet a tight deadline. How did you manage your time?
- What are the trade-offs between SQL and NoSQL databases?
- How do you ensure the security of a web application?
- What is your experience with cloud computing platforms?
- Describe a complex technical problem you solved and your approach.

## Preparation tips

### lists

- Review fundamental data structures and algorithms.
- Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert.
- Study common system design concepts and patterns.
- Prepare examples for behavioral questions using the STAR method.
- Research Optum's mission, values, and recent projects.
- Understand the technologies commonly used at Optum (e.g., Java, Python, cloud platforms).

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, recursion). Practice implementing these from scratch and analyze their time and space complexity.","shortDescription":"Weeks 1-2: Data Structures & Algorithms fundamentals. Practice coding."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into system design principles. Study topics like scalability, availability, consistency, load balancing, caching, and database design. Review common architectural patterns like microservices and event-driven architectures.","shortDescription":"Weeks 3-4: System Design concepts and patterns. Study scalability and databases."}
- {"title":"Behavioral Preparation","longDescription":"Week 5: Prepare for behavioral interviews. Identify key projects and experiences that demonstrate your skills in teamwork, problem-solving, leadership, and handling challenges. Practice articulating these using the STAR method.","shortDescription":"Week 5: Behavioral interview preparation. Use STAR method."}
- {"title":"Company Research","longDescription":"Week 6: Research Optum thoroughly. Understand the company's products, services, culture, and recent news. Prepare questions to ask the interviewer about the role, team, and company.","shortDescription":"Week 6: Company research and question preparation."}

## Location differences

- {"location":"San Francisco, CA","differences":{"tips":["Be prepared to discuss trade-offs in system design decisions.","Clearly articulate your thought process when solving problems.","Familiarize yourself with common design patterns.","Understand the implications of distributed systems.","Emphasize collaboration and communication skills."],"interviewFocus":["System Design","Problem Solving","API Design","Scalability","Code Quality"],"commonQuestions":["How would you design a system to handle real-time stock price updates for a global financial market?","Describe a challenging bug you encountered and how you debugged it.","Explain the principles of RESTful API design.","What are your thoughts on microservices vs. monolithic architectures?","How do you ensure code quality and maintainability in a large project?"]}}
- {"location":"Austin, TX","differences":{"tips":["Quantify your achievements with metrics whenever possible.","Showcase your understanding of testing methodologies.","Be ready to discuss database trade-offs.","Demonstrate knowledge of concurrent programming concepts.","Highlight experience with automation and deployment pipelines."],"interviewFocus":["Performance Optimization","Testing Strategies","Database Design","Concurrency","CI/CD"],"commonQuestions":["Describe a project where you had to optimize performance. What techniques did you use?","How do you approach testing in a CI/CD environment?","Explain the concept of eventual consistency.","What are the advantages and disadvantages of using a NoSQL database?","How do you handle concurrency issues in your code?"]}}
- {"location":"Remote","differences":{"tips":["Provide specific examples of your communication and collaboration skills.","Showcase your passion for learning and staying current.","Discuss your practical experience with cloud services.","Explain the benefits of containerization in development and deployment.","Highlight your ability to quickly grasp new concepts."],"interviewFocus":["Stakeholder Management","Continuous Learning","Cloud Computing","Containerization","Adaptability"],"commonQuestions":["Tell me about a time you had to work with a difficult stakeholder. How did you manage the relationship?","How do you stay updated with the latest technologies in software development?","Describe your experience with cloud platforms (AWS, Azure, GCP).","What are your thoughts on containerization (Docker, Kubernetes)?","How do you approach learning a new programming language or framework?"]}}

## Round 1: Technical Coding Round
**Type:** Technical Screening (Coding) · **Difficulty:** Medium · **Duration:** 45 min
Assess fundamental coding skills with data structures and algorithms.
This initial technical screening round focuses on assessing fundamental programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will evaluate your ability to understand the problem, devise an efficient solution, write clean and correct code, and explain your reasoning.
**Interviewers look for:** Clear and logical approach to problem-solving; Efficient and correct code implementation; Understanding of fundamental CS concepts; Ability to explain trade-offs
**Evaluation criteria:** Problem-solving skills; Algorithmic knowledge; Data structure proficiency; Coding ability; Communication of thought process
**Common rejection reasons:** Inability to articulate thought process; Incorrect or inefficient algorithm; Poor coding practices; Lack of understanding of time/space complexity
## Questions

- Reverse a linked list.
- Find the two numbers in an array that add up to a specific target.
- Implement a binary search tree.

## Preparation tips

- Practice coding problems on platforms like LeetCode (Easy/Medium difficulty).
- Review common data structures (arrays, linked lists, trees, hash maps) and algorithms (sorting, searching, dynamic programming).
- Focus on explaining your thought process clearly as you code.
- Be prepared to discuss the time and space complexity of your solutions.

## Round 2: System Design Round
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Assess ability to design scalable and robust systems.
This round focuses on your ability to design complex, scalable systems. You will be presented with a high-level problem (e.g., design Twitter's feed, a URL shortener, or a distributed cache) and expected to discuss various aspects of the design, including data models, APIs, scalability strategies, and potential bottlenecks.
**Interviewers look for:** Ability to design robust and scalable systems; Knowledge of architectural patterns; Understanding of trade-offs in design decisions; Clear communication of design choices
**Evaluation criteria:** System design capabilities; Scalability and performance considerations; Trade-off analysis; Understanding of distributed systems; API design principles
**Common rejection reasons:** Inability to design scalable systems; Poor understanding of distributed systems concepts; Lack of consideration for edge cases and failure scenarios; Unclear or overly complex design
## Questions

- Design a system like Instagram.
- Design a rate limiter.
- Design a distributed key-value store.

## Preparation tips

- Study common system design interview topics (e.g., load balancing, caching, databases, message queues).
- Read resources like 'Grokking the System Design Interview' or relevant blog posts.
- Practice designing systems and articulating your choices.
- Be prepared to discuss trade-offs and justify your decisions.

## Round 3: Behavioral and Managerial Round
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess behavioral competencies and cultural fit through past experiences.
This round focuses on your past experiences and how they align with the role and Optum's culture. You'll be asked behavioral questions that require you to provide specific examples using the STAR method (Situation, Task, Action, Result). The interviewer wants to understand your work style, how you handle challenges, and your potential fit within the team.
**Interviewers look for:** Evidence of collaboration and teamwork; Problem-solving approach in real-world scenarios; Adaptability and learning mindset; Alignment with Optum's values
**Evaluation criteria:** Behavioral competencies (teamwork, communication, problem-solving); Cultural fit; Motivation and passion; Past experiences and achievements
**Common rejection reasons:** Lack of specific examples; Inability to connect past experiences to the role; Poor communication of behavioral competencies; Negative attitude or lack of enthusiasm
## Questions

- Tell me about a time you faced a significant challenge at work and how you overcame it.
- Describe a situation where you had to work with a difficult team member. How did you handle it?
- What are your strengths and weaknesses?
- Why are you interested in this role at Optum?

## Preparation tips

- Prepare examples for common behavioral questions (teamwork, conflict resolution, leadership, failure, success).
- Use the STAR method to structure your answers.
- Be ready to discuss your career goals and why you are interested in Optum.
- Show enthusiasm and a positive attitude.