Affirm's coding interviews are medium to hard, similar to Google and Meta, but with a unique emphasis on behavioral assessment via the Bar Raiser round. Allocate 2-3 months for preparation: solve 150-200 LeetCode problems (focus on medium/hard), and practice all 16 Leadership Principles with structured stories. Consistency matters more than intensity—aim for 2 hours daily rather than sporadic marathon sessions.

Focus heavily on core data structures (arrays, trees, graphs) and algorithms (DFS, BFS, DP, sliding window). For SDE-2/3 roles, expect system design questions on scalability, APIs, and trade-offs. Always tie technical discussions to Affirm's domain—be ready to discuss how your solutions impact financial products or user experience.

Many candidates underprepare for the behavioral Bar Raiser, giving vague answers without using the STAR method. Others dive into coding without clarifying requirements or thinking aloud. Avoid these by linking every example to Affirm's Leadership Principles and demonstrating collaborative problem-solving, not just individual coding.

Stand out by preparing metric-driven stories that show real impact, not just tasks. Explicitly reference Affirm's Leadership Principles in your answers and ask insightful questions about their products or challenges. Show genuine curiosity about how engineering decisions affect customers and the business.

The process usually takes 4-6 weeks from initial screen to offer, with feedback after each round. The Bar Raiser stage can add 1-2 weeks, but recruiters provide updates. If you haven't heard back within 7-10 days after a round, a polite follow-up is appropriate.

SDE-1 focuses on executing well-defined tasks with mentorship, SDE-2 owns full features from design to deployment, and SDE-3 sets technical direction and influences cross-team strategy. Higher levels require broader scope, deeper system design, and demonstrated impact on product or engineering culture.

Use LeetCode for coding (target 150-200 problems, emphasize medium/hard), and study Affirm's Leadership Principles on their careers site. For system design, review scalability patterns and practice designing for fault tolerance. Conduct mock interviews focused on behavioral storytelling using the STAR method, as the Bar Raiser heavily evaluates this.

Affirm emphasizes a mission-driven, inclusive culture where engineers own products end-to-end and value customer empathy. They look for candidates who demonstrate innovation, collaboration, and alignment with their core values. Show this by discussing how your past work improved user outcomes and by asking about team dynamics and product decisions.