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```htmlInterview Preparation - Senior Software Engineer - Test at Meta

Interview Preparation Notes

Senior Software Engineer - Test at Meta

Behavioral Round

In this round, questions will dive deep into your past experiences, your approach to problem-solving, and how you handle various situations. Your answers should be structured in the STAR format: Situation, Task, Action, Result.

Q1: Can you tell me about a time when you had to lead a project from start to finish?
Situation:

I was working at Amazon as a Software Development Engineer, and I proposed the idea for Amazon’s first Low Code UI Automation Solution called CUTE.

Task:

The task was to develop a solution that could be used across the organization for UI testing purposes.

Action:

I built a low-code platform, conducted workshops to convince stakeholders, and presented the solution at DevCons in Dublin and Seattle.

Result:

The solution was adopted by the entire organization, significantly reducing manual testing efforts and improving deployment speed.

Technical Round

This round focuses on assessing your problem-solving skills, knowledge of algorithms and data structures, coding ability, and understanding of software design principles.

Q1: Write a function to find the first non-repeating character in a string.
def first_non_repeating_char(s):
count = {}
for ch in s:
count[ch] = count.get(ch, 0) + 1 for ch in s: if count[ch] == 1: return ch return None
Time Complexity: O(n), where n is the length of the string. Space Complexity: O(1), assuming the character set is fixed and small, otherwise O(n).

Design Round

This round evaluates your ability to design robust, scalable systems. You should discuss both high-level and low-level details.

Q1: Design a high-availability, low-latency distributed system to handle millions of API requests per second.
High-Level Design:
  • Use a load balancer to distribute incoming requests to multiple servers.
  • Implement microservices architecture to handle different functionalities.
  • Use a distributed database like Cassandra for high availability.
  • Implement caching using Redis or Memcached to reduce database load.
Low-Level Design:
  • Implement rate limiting at the API gateway to prevent abuse.
  • Use asynchronous processing for non-blocking operations.
  • Ensure data consistency with appropriate transactional mechanisms.

Preparation Tips

  • Brush up on data structures and algorithms, focusing on common interview topics like arrays, linked lists, trees, graphs, and dynamic programming.
  • Practice coding problems on platforms like LeetCode, HackerRank, or CodeSignal.
  • Prepare for behavioral questions using the STAR method.
  • Review system design concepts and practice designing systems on a whiteboard or using diagramming tools.

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