API Developer

Description

Join our team to design and build robust APIs for internal and external consumption. You will create RESTful APIs, implement authentication and authorization, optimize API performance, and document APIs. The role requires experience with API frameworks (FastAPI, Express, Spring Boot), API design principles, security best practices, and API testing. You will version APIs, handle backward compatibility, monitor API usage, and ensure API reliability.

Interview Questions (42)

Q1Explain how RESTful APIs work and their key principles.
Technical
Q2What are webhooks and how do they differ from polling?
Technical
Q3Describe your experience with API development and integration.
Experience
Q4How would you approach integrating with a third-party API that has poor documentation?
Situational
Q5Explain the concept of idempotency in API design.
Technical
Q6What is GraphQL and how does it differ from REST?
Technical
Q7How would you implement rate limiting for an API?
Technical
Q8What is the difference between OAuth and JWT?
Technical
Q9Tell me about your experience with GraphQL APIs.
Experience
Q10How would you handle a situation where you need to deprecate a widely-used feature?
Situational
Q11How would you implement pagination for a large dataset?
Technical
Q12How would you design a rate limiter?
Technical
Q13Explain the concept of API gateway and its benefits.
Technical
Q14Explain the concept of API versioning strategies.
Technical
Q15How does content negotiation work in REST APIs?
Technical
Q16What are the different strategies for API authentication?
Technical
Q17How would you implement idempotent API endpoints?
Technical
Q18Explain the concept of forward and backward compatibility in APIs.
Technical
Q19What are the different types of API contracts and documentation?
Technical
Q20What would you do if API response times suddenly increased?
Situational
Q21What aspects of backend development do you find most interesting?
Motivational
Q22Can you explain how you would design a RESTful API for a new service that needs to handle a large volume of requests?
Technical
Q23Can you explain the difference between REST and GraphQL and when you would choose one over the other?
Technical
Q24Can you explain how you optimized the API response time by 65% at API Corp?
Technical
Q25Can you describe the process you used to optimize API response times by 65% at API Corp?
Experience
Q26If you were tasked with improving the response time of an API, what steps would you take?
Situational
Q27Can you describe your experience with designing REST APIs in your recent projects, specifically focusing on performance and scalability?
Technical
Q28Can you explain your approach to designing and implementing REST APIs in your recent projects?
Technical
Q29What are some advantages of using RESTful APIs in your projects?
Technical
Q30How do you ensure secure API communication in your projects?
Technical
Q31How would you approach securing an API that you have developed?
Technical
Q32Tell me about a challenge you faced while integrating APIs in your projects and how you overcame it.
Behavioral
Q33How did your implementation of JWT-based authentication enhance security in the REST APIs you developed?
Technical
Q34How do you handle versioning and rate limiting for your APIs, and why are these features important?
Technical
Q35Can you explain your experience with developing RESTful APIs and how you implement versioning and rate limiting?
Technical
Q36Walk me through the last backend service you owned end to end. What scaled and what didn’t?
Experience
Q37Talk me through adding pagination to an existing API that does not have it.
Technical
Q38Idempotent versus safe HTTP methods. Why does the difference matter?
Technical
Q39How would you design rate limiting for a public API?
Technical
Q40How do you test code that depends on a third-party API?
Technical
Q41A read endpoint is timing out under load. Walk me through diagnosing and fixing it.
Situational
Q42Add an event-driven side effect to an existing synchronous endpoint without breaking it.
Situational