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Coinbase·Software Engineer·Online Assessment (OA)·Intermediate

Intermediate
May 2026

Summary

Did the Coinbase SWE online assessment and got the worker salary problem. Java was a rough choice for this one, took way longer than it should have.

Questions Asked (1)

Q1

Solve the worker salary optimization problem.

Algorithms & Data Structures
Author's notes

Java was probably the wrong call here.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the problem statement and constraints, as 'worker salary optimization' can mean different things (e.g., minimizing total cost, maximizing productivity, or fair distribution). Then, identify the core algorithmic problem (e.g., assignment, scheduling, or knapsack) and propose an efficient solution with appropriate data structures, discussing time and space complexity. Finally, walk through a small example to validate the approach and consider edge cases.

Pro tip: Demonstrate business acumen by relating the algorithm to Coinbase's context—e.g., optimizing compensation for a global remote workforce while ensuring fairness and compliance—and mention potential trade-offs between optimality and computational feasibility.

1. Clarify the Problem

Ask questions to understand the exact objective (e.g., minimize total salary, maximize output per dollar, or balance workload) and constraints (e.g., budget, worker skills, legal requirements).

2. Identify the Algorithmic Core

Map the problem to a known algorithmic pattern such as assignment problem (Hungarian algorithm), knapsack, linear programming, or scheduling, and justify your choice.

3. Design the Solution

Outline the algorithm step-by-step, choose appropriate data structures (e.g., priority queues, matrices), and analyze time and space complexity.

4. Validate with Examples

Walk through a small concrete example to show how the algorithm works and verify it produces the correct output.

5. Discuss Edge Cases and Optimizations

Consider edge cases (e.g., ties, infeasible constraints) and potential optimizations or alternative approaches (e.g., greedy vs. dynamic programming).

Key Points to Mention

  • Problem clarification: define objective function and constraints explicitly.
  • Algorithm selection: justify why a particular algorithm (e.g., Hungarian, DP, LP) is suitable.
  • Complexity analysis: state time and space complexity and compare with alternatives.
  • Data structures: explain how they enable efficient implementation.
  • Edge cases: handle ties, infeasible inputs, and scalability.
  • Business context: relate to real-world scenarios like fair compensation or cost optimization at Coinbase.

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