The Principal Engineer (GL30) interview at Optum is a rigorous process designed to assess deep technical expertise, leadership potential, and strategic thinking. Candidates are expected to demonstrate a strong command of software engineering principles, architectural design, problem-solving abilities, and the capacity to mentor and guide other engineers. The interview process typically involves multiple rounds, including technical assessments, system design challenges, and behavioral evaluations, with a focus on real-world problem-solving and impact.
Rounds·4
Timeline·~14d
Experience·8 - 15 yrs
Comp band·US$180000 - US$250000
Interview time·225 min
Evaluation
Preparation
Tips
Study plan
Fig · Study plan — 04 phases
01 / 04Phase 01 of 04
Weeks 1-2: Data Structures & Algorithms (DSA). Practice 2-3 medium/hard problems daily.
Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash tables, sorting, searching, dynamic programming, and greedy algorithms. Practice implementing these and analyzing their time and space complexity. Aim for 2-3 medium/hard problems per day.
Phase 02 of 04
Weeks 3-4: System Design. Study core concepts and case studies.
Weeks 3-4: Dive into System Design. Study concepts like load balancing, caching, database sharding, message queues, CAP theorem, and microservices architecture. Work through common system design case studies (e.g., designing Twitter, Uber, Netflix).
Phase 03 of 04
Week 5: Behavioral Prep. Use STAR method for leadership/teamwork stories.
Week 5: Behavioral and Leadership Preparation. Reflect on your past experiences and prepare stories using the STAR method for common leadership, teamwork, conflict resolution, and problem-solving scenarios. Understand Optum's values.
Phase 04 of 04
Week 6: Domain Knowledge & Mock Interviews. Practice with relevant tech and mock sessions.
Week 6: Domain-Specific Knowledge and Mock Interviews. Review technologies relevant to the specific role (e.g., cloud platforms, specific programming languages, distributed systems). Conduct mock interviews with peers or mentors to simulate the actual interview experience.
Questions
Locations
Fig · Regions — 02 locations
01 / 02Location
Interview focus
Common questions
Tips
Location
Interview focus
Common questions
Tips
Rounds
Expand a step for evaluation criteria, sample questions, and prep notes.
Technical Coding Interview · 60 min · Senior Software Engineer or Staff Engineer
This round focuses on assessing your fundamental programming skills and problem-solving abilities. You will be asked to solve coding problems, often involving data structures and algorithms. The interviewer will evaluate your approach, efficiency, code quality, and ability to explain your thought process. Expect questions that require you to think critically and apply theoretical knowledge to practical coding challenges.
What they look for
Evaluation
Sample questions
Given a binary tree, find the lowest common ancestor of two given nodes.
Implement a function to find the k-th largest element in an unsorted array.
Design a data structure that supports insertion, deletion, and getRandom O(1) time complexity.
Prep for this round
Common rejection reasons
System Design Interview · 60 min · Senior Staff Engineer or Architect
This round evaluates your ability to design robust, scalable, and maintainable software systems. You'll be presented with a high-level problem statement and asked to design a system to address it. The focus is on your architectural thinking, understanding of distributed systems, trade-off analysis, and ability to justify your design decisions. Expect to discuss databases, APIs, caching strategies, load balancing, and potential bottlenecks.
What they look for
Evaluation
Sample questions
Design a URL shortening service like bit.ly.
Design a system to handle real-time analytics for a large e-commerce platform.
How would you design a distributed cache system?
Prep for this round
Common rejection reasons
Behavioral And Leadership Interview · 45 min · Engineering Manager or Director
This round focuses on your behavioral competencies, leadership skills, and past experiences. You'll be asked questions about how you've handled specific situations, managed projects, worked in teams, and demonstrated leadership. The goal is to understand your working style, your ability to influence others, and how you align with Optum's culture and values. Use the STAR method to structure your answers.
What they look for
Evaluation
Sample questions
Tell me about a time you had to lead a project from start to finish. What were the biggest challenges?
Describe a situation where you had to influence a team or stakeholder to change their approach.
How do you handle constructive criticism or feedback?
Prep for this round
Common rejection reasons
Executive/Managerial Interview · 60 min · Director of Engineering or VP of Engineering
This final round, often with senior leadership, assesses your strategic thinking, leadership impact, and vision. You'll discuss your career aspirations, how you see yourself contributing to Optum's long-term goals, and your approach to technical leadership and innovation. This is an opportunity to demonstrate your understanding of the business context and your ability to drive significant technical impact.
What they look for
Evaluation
Sample questions
What is your vision for the future of technology in our industry?
How would you foster a culture of innovation within an engineering team?
Describe a time you made a significant technical decision that had a major business impact.
Prep for this round
Common rejection reasons
DSA
Frequently reported on Optum loops
Other guides
