The Senior Staff Software Engineer (L8) interview at Affirm is a rigorous process designed to assess deep technical expertise, leadership capabilities, and strategic thinking. Candidates are expected to demonstrate a strong command of software engineering principles, experience in designing and scaling complex systems, and the ability to mentor and influence other engineers. The interview process typically involves multiple rounds, including technical deep dives, system design, behavioral assessments, and a final executive conversation.
Rounds·4
Timeline·~4d
Experience·8 - 15 yrs
Comp band·US$180000 - US$250000
Interview time·210 min
Evaluation
Preparation
Tips
Study plan
Fig · Study plan — 04 phases
01 / 04Phase 01 of 04
Weeks 1-2: DSA fundamentals and practice (LeetCode Medium/Hard).
Weeks 1-2: Focus on Data Structures and Algorithms. Review fundamental data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice solving problems on platforms like LeetCode, focusing on medium to hard difficulty. Understand time and space complexity analysis.
Phase 02 of 04
Weeks 3-4: System Design principles and practice (scalability, reliability).
Weeks 3-4: Dive into System Design. Study common architectural patterns (microservices, event-driven, monolithic), database design (SQL vs. NoSQL, sharding, replication), caching strategies, load balancing, message queues, and API design. Practice designing large-scale systems like social media feeds, URL shorteners, or e-commerce platforms.
Phase 03 of 04
Week 5: Behavioral preparation (STAR method, leadership examples).
Week 5: Prepare for Behavioral and Leadership questions. Reflect on your career experiences using the STAR method (Situation, Task, Action, Result). Identify examples that showcase leadership, conflict resolution, mentorship, handling failure, and driving impact. Understand Affirm's values and how your experiences align.
Phase 04 of 04
Week 6: Mock interviews and final review.
Week 6: Mock interviews and final review. Conduct mock interviews with peers or mentors covering all aspects of the interview process. Refine your answers, focus on clear communication, and ensure you can articulate your thought process effectively. Review any specific technologies or domains relevant to the role at Affirm.
Questions
Locations
Fig · Regions — 03 locations
01 / 03Location
Interview focus
Common questions
Tips
Location
Interview focus
Common questions
Tips
Location
Interview focus
Common questions
Tips
Rounds
Expand a step for evaluation criteria, sample questions, and prep notes.
Data Structures And Algorithms Interview · 60 min · Software Engineer (Peer)
This round focuses on your fundamental computer science knowledge. You will be presented with coding problems that require you to implement solutions using appropriate data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and well-tested code, as well as your understanding of time and space complexity.
What they look for
Evaluation
Sample questions
Given an array of integers, find the contiguous subarray with the largest sum.
Implement a function to find the k-th smallest element in a binary search tree.
Design and implement a data structure that supports insert, delete, search, and getRandom in average O(1) time.
Prep for this round
Common rejection reasons
System Design Interview · 60 min · Senior Staff Software Engineer / Architect
This round assesses your ability to design and architect complex, scalable, and reliable software systems. You will be given an open-ended problem and expected to design a solution, discussing various components, technologies, trade-offs, and potential bottlenecks. The focus is on your architectural thinking and ability to handle ambiguity.
What they look for
Evaluation
Sample questions
Design a URL shortening service like bit.ly.
Design a distributed rate limiter.
Design a system to store and retrieve user activity logs for a large social media platform.
Prep for this round
Common rejection reasons
Behavioral And Leadership Interview · 45 min · Hiring Manager / Senior Engineering Leader
This round focuses on your behavioral competencies, leadership skills, and cultural fit. You will be asked questions about your past experiences, focusing on how you've handled various situations, led projects, worked with teams, and demonstrated leadership. The interviewer aims to understand your working style, motivations, and how you align with Affirm's values.
What they look for
Evaluation
Sample questions
Tell me about a time you had to lead a project with a tight deadline. How did you manage the team and ensure success?
Describe a situation where you had a significant disagreement with a colleague or manager. How did you resolve it?
How do you mentor junior engineers? Provide an example.
Tell me about a time you failed. What did you learn from it?
Prep for this round
Common rejection reasons
Executive / Managerial Interview · 45 min · Director of Engineering / VP of Engineering
This final round is typically with a senior leader (Director or VP). It's a high-level conversation focused on your strategic thinking, leadership philosophy, and how you envision contributing to Affirm's long-term technical vision. You'll discuss your career aspirations and how they align with the company's direction. This is an opportunity to ask strategic questions as well.
What they look for
Evaluation
Sample questions
What do you see as the biggest technical challenges facing Affirm in the next 3-5 years?
How would you influence the technical roadmap of a large engineering organization?
Describe your approach to fostering innovation within an engineering team.
What are your long-term career goals, and how does this role at Affirm align with them?
Prep for this round
Common rejection reasons
DSA
Frequently reported on Affirm loops
Other guides
