I recently completed the ZipRecruiter 2026 SDE / Intern CodeSignal OA. One-line summary: 4 questions in 70 minutes, medium difficulty, but noticeable time pressure.
The OA focuses heavily on real-world scenarios, data processing, and algorithm optimization. Most questions are variations of LeetCode Medium, covering strings, arrays, greedy strategies, and basic dynamic programming.
The platform is CodeSignal, and it places strong emphasis on clean code, edge case handling, and efficiency. Below are the latest high-frequency questions and how to approach them quickly.
OA Question Breakdown (4 Questions)
1. Valid Parentheses with Wildcard
Given a string containing '(', ')', and '*', where '*' can represent an empty string, '(' or ')', determine if the string is valid.
Approach: Use two counters (lo and hi) to maintain the possible range of open parentheses. Traverse once while adjusting the range dynamically. The key is leveraging the flexibility of '*'.
2. Meeting Rooms II (Variant)
Given a list of meeting intervals, return the minimum number of meeting rooms required.
Approach: Use a sweep line or min heap. Sort all start and end times. Track ongoing meetings using a heap that stores end times.
3. Task Scheduler with Cooldown
Given a list of tasks and a cooldown interval n, return the minimum time required to finish all tasks.
Approach: Greedy + math. Count task frequencies and prioritize the most frequent task. Use the formula: (max_freq - 1) * (n + 1) + number of tasks with max frequency.
4. Maximum Profit in Job Scheduling
Given jobs with start time, end time, and profit, return the maximum profit without overlapping jobs.
Approach: Dynamic programming + binary search. Sort jobs by end time, and for each job, find the last non-conflicting job using binary search. Transition: dp[i] = max(dp[i-1], profit[i] + dp[prev]).
Key Takeaways
Question count and timing: 4 questions in 70 minutes. Tight timing, especially for the last two problems.
Core topics:
- String processing (parentheses matching)
- Greedy algorithms (task scheduling, intervals)
- Priority queue / heap
- Dynamic programming (interval scheduling)
Success strategy: Secure the first two questions quickly, then optimize time for the harder ones.
Preparation Strategy
- Focus on LeetCode Medium problems in strings, greedy, intervals, and DP
- Practice full simulations: 4 questions within 70 minutes
- Prioritize easy-to-hard solving order
- Leave buffer time for debugging the last question
Common Pitfalls
- Incorrect boundary handling in parentheses problems
- Forgetting the task scheduler formula
- Missing DP transitions in interval scheduling
What Happens After OA
After passing the OA, candidates typically go through 3–4 rounds of virtual onsite interviews, including:
- Coding interviews
- System design
- Behavioral interviews
Need Help Preparing?
If you're preparing for ZipRecruiter 2026 SDE / Intern roles and want to move faster:
- Want full Python / Java solutions for these questions?
- Need more variations and pattern breakdowns?
- Looking for VO (System Design + Behavioral) insights?
If you're short on time and want to significantly improve your pass rate, consider:
Programhelp Professional OA Support
- CodeSignal OA assistance with high success rate
- Real-time guidance and full-process support
- Proven results helping candidates land offers
Many candidates have successfully secured ZipRecruiter offers through targeted preparation and support.
Good luck with your OA — stay calm, focus on optimization, and go all in.
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