← Kneron Interview Insights

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

Intermediate
Jun 2026

Summary

Kneron Software Engineer OA, one coding problem involving a paginated REST API and some date filtering logic. Not the hardest thing I've ever seen but there were enough moving parts to trip you up if you weren't careful.

Questions Asked (1)

Q1

Implement a function that queries a paginated IoT device API by status, then returns the count of devices that were added in a given month/year and have a rootThreshold value above a specified threshold.

API & IntegrationsAlgorithms & Data Structures
Author's notes

The pagination part is fine, loop through pages until you hit the last one.

Create a free account to read the full note

AI HintsAI Generated

Suggested Approach

Start by clarifying the API contract, including pagination mechanism, filtering parameters, and response schema. Then outline a solution that iterates through pages, filters devices by creation date and rootThreshold, and counts matches. Finally, discuss edge cases and potential optimizations.

Pro tip: Mention that you would use the API's status filter to reduce data transfer and consider server-side filtering for date and threshold if supported, to minimize client-side processing and network calls.

1. Clarify Requirements and API Details

Ask about the API's pagination method (cursor, offset, page number), available query parameters (status, date range, threshold), and response structure. Confirm the definition of 'added in a given month/year' (e.g., based on creation timestamp).

2. Design the Algorithm

Plan to fetch pages sequentially or in parallel (if safe), filter each device by checking if its creation date falls within the target month/year and if its rootThreshold exceeds the threshold, and increment a counter for matches.

3. Handle Pagination and Termination

Implement a loop that continues until no more pages are available (e.g., empty results or no next page token). Ensure proper handling of rate limits and errors, with retries or backoff if needed.

4. Optimize and Validate

Consider using server-side filtering if the API supports it to reduce data transfer. Validate the count by testing with known data or edge cases (e.g., devices exactly at threshold, timezone issues).

5. Discuss Complexity and Edge Cases

Analyze time and space complexity (O(n) time, O(1) space for counting). Mention edge cases: empty results, pagination inconsistencies, timezone handling, and threshold inclusivity.

Key Points to Mention

  • Pagination handling: cursor-based vs. offset-based, and how to detect the last page.
  • Efficient filtering: use API query parameters for status, and consider server-side date/threshold filters if available.
  • Date comparison: parse timestamps correctly, handle timezones, and define month/year boundaries inclusively.
  • Threshold comparison: clarify if 'above' means strictly greater than or greater than or equal to.
  • Error handling and rate limiting: implement retries with exponential backoff and respect API limits.
  • Testing: unit tests with mocked API responses and edge cases like no devices, all devices matching, etc.

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