Falcon Fintech Backend Engineer Interview: Rounds, Questions and Preparation

What the job involves

As a backend engineer at a neobanking, lending, or insurtech company like Falcon Fintech, you will build and maintain the server-side systems that power digital banking, loan processing, and insurance products. Day to day, you will write APIs, integrate with payment gateways and credit bureaus, ensure transaction security, and handle high-volume data flows. You will work closely with product, compliance, and frontend teams to deliver reliable and scalable financial services.

Role and Technical Knowledge

1. 1

   How would you design a REST API for a loan application submission in a lending platform?

   Outline endpoints for creating, updating, and fetching loan applications, include validation, error handling, and status codes.

2. 2

   Explain how you would ensure idempotency when processing a payment through a gateway like Razorpay.

   Discuss using unique idempotency keys, storing request states, and preventing duplicate transactions.

3. 3

   What are the key considerations for storing sensitive customer data such as Aadhaar or PAN in a neobanking backend?

   Cover encryption at rest and in transit, tokenization, access controls, and compliance with RBI guidelines.

4. 4

   How would you integrate a credit bureau API (e.g., CIBIL) into a loan origination system?

   Describe making secure API calls, handling timeouts, parsing responses, and caching results appropriately.

Practical Scenarios

1. 5

   A payment callback from a gateway is delayed, and the user's account is not updated. How would you debug and resolve this?

   Talk about checking logs, verifying webhook signatures, implementing retry mechanisms, and reconciling with the gateway.

2. 6

   Your lending platform is experiencing slow response times during peak hours. What steps would you take to improve performance?

   Suggest database indexing, query optimization, caching, load balancing, and horizontal scaling.

3. 7

   How would you handle a situation where a third-party insurance API you depend on goes down?

   Discuss fallback mechanisms, circuit breakers, queuing requests, and notifying stakeholders.

4. 8

   You need to implement a feature to calculate interest on a loan with flexible repayment schedules. How would you approach it?

   Explain breaking down the calculation logic, using precise data types, and writing unit tests for edge cases.

Behavioral and HR

1. 9

   Why do you want to work in the fintech sector, especially in neobanking or lending?

   Show genuine interest in financial inclusion, digital transformation, and solving real-world problems.

2. 10

   Describe a time you had to learn a new technology quickly for a project.

   Use the STAR method, highlight your learning process, and relate it to backend development.

3. 11

   How do you handle tight deadlines when working on multiple backend features?

   Discuss prioritization, communication with stakeholders, and breaking tasks into manageable chunks.

4. 12

   Tell me about a time you made a mistake in code that affected others. How did you handle it?

   Emphasize accountability, quick resolution, and steps taken to prevent recurrence.

Problem Solving and Design

1. 13

   How would you design a system to send real-time notifications for loan approvals or rejections?

   Consider message queues, push notifications, email/SMS gateways, and ensuring delivery reliability.

2. 14

   What database schema would you propose for storing insurance policy details and claims?

   Outline tables for policies, customers, claims, and relationships, with indexing for frequent queries.

3. 15

   Explain how you would implement rate limiting for APIs exposed to third-party partners.

   Discuss token bucket or leaky bucket algorithms, using Redis, and returning appropriate HTTP status codes.

4. 16

   How would you ensure data consistency across microservices in a lending workflow?

   Mention saga patterns, event sourcing, distributed transactions, and compensating actions.