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Upstart·Software Engineer·Technical Phone Screen·Intermediate

Intermediate
Apr 2026

Summary

Coding screen at Upstart for a software engineer role. One filtering and aggregation problem, nothing too exotic, but the edge cases are where it gets you.

Questions Asked (1)

Q1

Given a list of name-score pairs, filter out entries where the score exceeds a threshold, then find and return the name with the highest score among the remaining entries.

Algorithms & Data Structures
Author's notes

Seemed straightforward at first.

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AI HintsAI Generated

Suggested Approach

Clarify the problem constraints (e.g., input format, threshold inclusivity, tie-breaking) before proposing a solution. Then outline a linear scan approach: filter out entries with score > threshold, and track the maximum score and corresponding name among the rest. Discuss time and space complexity, and consider edge cases like empty list or all filtered out.

Pro tip: Mention that you can combine filtering and finding the max in a single pass to optimize, and explicitly state how you handle ties (e.g., first occurrence or lexicographical order) to show attention to detail.

1. Clarify requirements

Ask about input format, threshold inclusivity (strictly greater than or greater than or equal to), tie-breaking rules, and what to return if no valid entries exist.

2. Outline approach

Propose a single-pass algorithm: iterate through the list, skip entries with score > threshold, and keep track of the maximum score and its name.

3. Analyze complexity

State that the time complexity is O(n) and space complexity is O(1) beyond the input, as only a few variables are needed.

4. Handle edge cases

Discuss cases like empty input, all scores above threshold, duplicate max scores, and negative scores or threshold.

5. Write code or pseudocode

Provide a clean implementation in a language of choice, using clear variable names and comments.

Key Points to Mention

  • Single-pass O(n) solution combining filtering and max-finding
  • Threshold comparison: strictly greater than vs. greater than or equal to
  • Tie-breaking strategy for equal maximum scores
  • Return value when no entries remain after filtering (e.g., null, empty string, or error)
  • Space complexity O(1) and time complexity O(n)
  • Edge cases: empty list, all filtered out, negative scores

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.