Affirm Interview Questions
Practice 22 real Affirm interview questions for 2026. Affirm interview questions and interview preparation focused on fintech problems — coding, system design, analytics, SQL, and behavioral fit — across Software Engineer, Data Scientist, and Data Engineer roles. These are real questions drawn from actual interviews with detailed solutions designed to sharpen your problem-solving, product sense, and execution under time pressure. Expect coding-heavy rounds first (algorithms, timestamped data structures, LRU caches), then system-design and domain-specific deep dives, plus behavioral interviews that probe ownership and cross-functional impact. For Software Engineers the recurring themes are experimentation infrastructure and A/B testing platform design, ledger- and repayment-oriented problems (balances, settlements, aggregation), fraud-detection and PII extraction, plus algorithmic/data-structure puzzles like shortest-unique-substring and timestamped maps. Data Scientists get problems centered on loan/payments analysis, approval-rate diagnostics, profitability calculations, and cross-functional communication. Data Engineers are weighted toward transactional SQL and customer/transactions data modeling. Prep by practicing ledger-style problems, experiment design and metrics, real-world SQL on transaction schemas, and concise STAR stories that show measurable impact.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Design an A/B Testing Platform
Design an internal A/B testing platform for a large consumer product. The platform should let product managers and engineers create experiments, defin...
Design an A/B testing platform
Design an internal A/B testing platform for a consumer product company. Product and engineering teams should be able to: - create, update, pause, and ...
Compute Balances and Minimize Settlements
You are building a daily ledger service. A transaction record has three fields: timestamp, user_id, and delta_amount. delta_amount can be positive or ...
Design restaurant shift scheduling
Design the backend for a restaurant workforce scheduling system. A company operates many restaurants. Each restaurant has employees and managers. Ever...
Describe your highest-impact project
Tell me about the project where you created the biggest impact. In your answer, cover: - the business or user problem you were solving - why the probl...
Implement a timestamped map
Implement an in-memory timestamped map. Support these operations: - put(key, value, timestamp): store value for key at the given integer timestamp - g...
Implement an LRU cache
Problem Design and implement an LRU (Least Recently Used) cache that supports the following operations in average O(1) time: - get(key) -> value: Retu...
Determine Redeemable Promotion Offers
You are given predefined objects for promotion offers and user redemption events. A PromotionOffer has: - offer_id - start_time - end_time - max_redee...
Determine winner in optimal-play card game
Determine winner in optimal-play card game Given a row of N cards with integer values (values may be positive, zero, or negative), two players alterna...
Design a Ticketmaster-like ticketing system
System Design Prompt Design an online event ticketing platform (Ticketmaster-like) that allows users to: 1. Browse/search events and view seat maps (o...
Diagnose Sudden Drop in Credit-Card Approval Rate
Diagnose Sudden Drop in Credit-Card Approval Rate Fraud Risk: Sudden Drop in Credit Approval Rate Context You are the on-call Data Scientist supportin...
Calculate Profit of 4-Month Loan at 30% APR
Calculate Profit of 4-Month Loan at 30% APR Credit Risk — Short-term Personal Loan Profitability Context You are evaluating the profit on a simple-int...
Navigate Cultural Differences in Cross-Functional Teams
Navigate Cultural Differences in Cross-Functional Teams Behavioral: Tell Me About Yourself + Handling Cultural Differences Context - Role: Data Scient...
Find shortest unique substring per word
Shortest unique substring for each word You are given an array of distinct strings words. For each word w in words, find a non-empty contiguous substr...
Deliver a concise self-introduction
Deliver a concise self-introduction Behavioral Prompt: 1–2 Minute Self‑Introduction for a Data Engineer Technical Screen Context You are interviewing ...
Discuss team fit and leadership with manager
Discuss team fit and leadership with manager Behavioral Interview Prep: 30‑Minute Hiring Manager Conversation (Software Engineer) Context You are prep...
Detect fraud events and extract PII
You are given a list of event objects (dictionaries/JSON). Each event has: - event_type: either "underwriting" or "fraud_flag" - customer_details: a n...
Compute Available Offers per User
You are given a set of promotional offers and a CSV event stream read from standard input. Each Offer has the following fields: - name: string - start...
Write SQL for Transactions and Customers
You are given two tables: - customers(customer_id INT PRIMARY KEY, signup_date DATE, region VARCHAR, segment VARCHAR) - transactions(transaction_id IN...
Implement and debug event filtering in Python
You are given a list of event dictionaries with keys: id (str), type (str), ts (int, seconds since epoch), payload (dict). Implement filter_events(eve...