ML Software Engineer (L4/L5) - Media Algorithms

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

High-Level Design for Zero-Downtime Live Production Systems Imagine you're tasked with designing a live production system that requires zero downtime during deployments and updates. This system handles a large volume of requests and is critical to the business. Let's consider a scenario: Scenario: You are building a service that provides real-time stock quotes to users. The service needs to be highly available and scalable to handle peak loads. Deployments must not interrupt the service, ensuring users always receive the latest data. Questions to address in your design: High-Level Architecture: Describe the overall architecture of the system. Include key components, their responsibilities, and how they interact. Deployment Strategy: Detail the deployment strategy you would use to achieve zero downtime. Explain the steps involved in deploying new versions of the service. Load Balancing: How would you distribute traffic across different instances of the service to ensure high availability and prevent overload? Monitoring and Rollback: What monitoring tools and metrics would you use to detect issues during deployment? Describe the rollback strategy in case of a failed deployment. Data Consistency: How would you ensure data consistency across different instances of the service during updates? Scaling: How would you scale the system horizontally to handle increased traffic? Explain each of these areas with consideration to both the design and the practical steps required for running such a system in live production. Consider specific technologies and tools where appropriate to illustrate your understanding. This question aims to assess your understanding of designing and operating highly available systems, your knowledge of deployment strategies, and your ability to handle real-world challenges in a production environment.

Netflix

Could you elaborate on some challenges you've encountered while working with Java and Scala?