Software Engineer (L4/L5) - Enablement Apps

Netflix

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. 2: abc 3: def 4: ghi 5: jkl 6: mno 7: pqrs 8: tuv 9: wxyz Example 1: Input: digits = 23 Output: [ad,ae,af,bd,be,bf,cd,ce,cf] Example 2: Input: digits = Output: [] Example 3: Input: digits = 2 Output: [a,b,c]

Netflix

Design a Distributed Service Let's design a distributed service that can handle a large volume of requests while maintaining high availability and low latency. Consider a URL shortening service like TinyURL as an example. Specific Requirements: Functionality: The service should be able to: Accept a long URL and generate a unique short URL. Redirect users from the short URL to the original long URL. Scale: The service should be able to handle millions of URL shortening and redirection requests per day. Availability: The service should be highly available, with minimal downtime. Latency: The redirection from the short URL to the long URL should be as fast as possible. Storage: The service should efficiently store the mapping between short URLs and long URLs. Consider the Following Aspects in Your Design: Data Model:** How will you store the mapping between short and long URLs? What database technology will you use, and why? Algorithm for Short URL Generation:** How will you generate unique short URLs? How do you avoid collisions? System Architecture:** How will you distribute the load across multiple servers? What components will you use (e.g., load balancers, caches, databases)? Caching:** Where and how will you implement caching to improve performance? Fault Tolerance:** How will you ensure that the service remains available even if some servers fail? Monitoring and Alerting:** How will you monitor the health of the service and alert operators to potential problems? Walk me through your design, explaining the choices you make and the trade-offs involved. Be prepared to discuss alternatives and justify your decisions. For instance, why would you choose a relational database like MySQL over a NoSQL database like Cassandra, or vice versa? How would your design change if you needed to support custom short URLs?

Netflix

Tell me about a time you went above and beyond what was expected of you.