Role
Backend Developer
Real interview questions with expert answers, plain-English explanations, and practical examples. (38 questions)
Airbnb
Backend Developer
Concurrency
How would an Airbnb backend developer design a system to manage concurrent booking requests for a single property, preventing overbooking and ensuring data consistency?
PayPal
Backend Developer
Concurrency
How would a PayPal Backend Developer design a system to prevent race conditions and ensure atomicity during concurrent payment transactions?
Uber
Backend Developer
Concurrency
How would an Uber backend developer handle concurrent updates to a shared resource, like a rider’s wallet balance, in a high-throughput microservice environment?
ServiceNow
Backend Developer
System Design
How would you design a highly scalable and fault-tolerant system for real-time task management at ServiceNow?
Deloitte
Backend Developer
Caching
A critical Deloitte backend service is experiencing database load due to frequent data access. How would a backend developer design and implement a distributed caching strategy to alleviate this, ensuring data consistency and optimal performance?
ServiceNow
Backend Developer
Message Queues
How do you handle message processing failures and ensure data integrity using dead letter queues and retry mechanisms?
Atlassian
Backend Developer
Databases
How would a backend developer design a database connection pooling strategy for a high-traffic microservice?
Salesforce
Backend Developer
Databases
When would a backend developer choose different database isolation levels for a Salesforce application, and what are the trade-offs?
Salesforce
Backend Developer
Concurrency
Explain consistency models beyond eventual consistency in distributed systems, and how would a backend developer choose one for a critical microservice?
ServiceNow
Backend Developer
Concurrency