EU Machinery Safety Engineer, High Risk Operations (HRO)

Amazon

You are given a string moves of length n consisting only of characters 'L', 'R', and '_'. The string represents your movement on a number line starting from the origin 0. In the ith move, you can choose one of the following directions: move to the left if moves[i] = 'L' or moves[i] = '_' move to the right if moves[i] = 'R' or moves[i] = '_' Return the *distance from the origin* of the *furthest* point you can get to after n moves. Example 1: Input: moves = L_RL__R Output: 3 Explanation: The furthest point we can reach from the origin 0 is point -3 through the following sequence of moves LLRLLLR. Example 2: Input: moves = R__LL Output: 5 Explanation: The furthest point we can reach from the origin 0 is point -5 through the following sequence of moves LRLLLLL. Example 3: Input: moves = _ Output: 7 Explanation: The furthest point we can reach from the origin 0 is point 7 through the following sequence of moves RRRRRRR.

Amazon

Let's design a Twitter-like service. Consider the following: Core Functionality: How would you implement the ability for users to post tweets, follow other users, and view a timeline of tweets from the users they follow? Data Model: What database schema would you use to store tweets, user information, and follower relationships? Consider scalability and efficiency for reads and writes. Scalability: How would you handle a large number of users and tweets? Discuss strategies for sharding, caching, and load balancing. Real-time Updates: How would you ensure that users see new tweets in their timeline in near real-time? Consider using technologies like WebSockets or Server-Sent Events. Search: How would you implement a search feature that allows users to find tweets containing specific keywords or hashtags? Think about indexing strategies and search algorithms. Rate Limiting: How would you prevent abuse and ensure fair usage of the service? Describe your approach to rate limiting API requests. Example Scenario: Imagine a user, Alice, follows 1,000 other users, including Bob. Bob posts a tweet. Explain how that tweet would propagate to Alice's timeline, considering potential performance bottlenecks. Technology Stack: What technologies (programming languages, frameworks, databases, etc.) would you choose and why?

Amazon

Tell me about yourself. To help me understand your background, please structure your response by including the following: A brief overview of your educational background: Where did you go to school, what did you study, and what were your key areas of focus or specializations? A summary of your professional experience: Walk me through your previous roles, highlighting the companies you worked for, your responsibilities, and the significant projects you contributed to. Be sure to mention any accomplishments or quantifiable results you achieved. Skills and areas of expertise: What are your strongest technical skills and areas of expertise? Provide specific examples of how you've applied these skills in previous projects or roles. For instance, if you're proficient in Python, describe a project where you used Python to solve a complex problem. Your motivations and interests: What are you passionate about in the field of technology, and what motivates you to pursue a career in this area? What specific aspects of software engineering or your chosen field do you find most exciting or rewarding? Your career goals: Where do you see yourself in the next 3-5 years? What are your short-term and long-term career aspirations, and how does this role align with your overall goals? Are you looking to specialize in a particular area, take on leadership responsibilities, or make a significant impact in a specific industry? By providing this structured overview, I hope to gain a better understanding of your background, skills, and aspirations, and how they align with the goals and requirements of this position.