One recent account of a software engineering process described four CodeSignal-style questions in about 60 minutes; another described two questions in 70 minutes. Applicants to quantitative roles may receive a separate probability and logic assessment. Confirm the track named in your invitation.

When to Expect the OA for Your Role

A coding interview often comes quickly after applying for a job. For example, a software developer and internship applicant said that they were given four medium-to-hard coding problems to solve within one hour. Applicants to other software engineering roles may receive two coding problems over 70 minutes. Quantitative research and trading screens focus on probability, expected value, and logical reasoning rather than a typical software interview.

Does Your Online Assessment Matter?

The assessment helps determine who advances to the next technical interview. Code that passes the visible tests may still fail hidden tests. Later questions may involve more implementation work. SIG doesn't set a single cutoff. Pass as many test cases as possible before time expires. Then improve the algorithmic complexity of your solution. Check for integer, ordering, and state reset errors.

Compiled List of SIG OA Question Types

Useful practice topics include hash maps, strings, heaps, intervals, probability, and simulation.

1. String Compression - in-place run-length encoding.
2. Kth Largest Element in an Array - heap or selection.
3. LeetCode 56: Merge Intervals - sort and merge overlapping intervals.
4. Longest Substring Without Repeating Characters - sliding-window state.
5. Group Anagrams - canonical hash keys for strings.
6. Design HashMap - handling hash collisions and API invariants.
7. Battleships in a Board - grid traversal without double counting.
8. Random Pick with Weight - using prefix sums and probability mapping.

SIG Interview Questions

Recently asked in real interviews

These questions were asked recently in real SIG interviews. Practice these and 4,000+ other questions from 1,000+ companies on Lodely.

SIG Quantitative Researcher OA

coding Hard

Age Logic Puzzle with Truth/Lie Conditions

coding Hard

Hashmap for new programming language

algorithms Hard

Bayesian Probability with Biased Coins

coding Hard

Sea Battle Game

algorithms Medium

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How to Prepare and Pass the SIG Online Assessment

Complete four 70-minute mock assessments with a mix of easy and medium problems. Read all questions first, then complete every solution before polishing a harder one. Spend two sessions on custom data structures, collision testing, repeated updates, missing keys, and large inputs. If your invite specifies a quantitative assessment, spend time on conditional probability and expected value. Use Lodely to organize SIG-specific coding and interview preparation while keeping the software and quantitative tracks separate.

SIG Interview Question Breakdown

Design HashMap

Type: Data-structure implementation. Prompt: Implement insert, lookup, update, and delete operations without a built-in map. The Trick: Keep collision handling correct during updates and deletions. What It Tests: Data-structure design and reasoning about invariants.

Kth Largest Element in an Array

Type: Selection. Prompt: Return the element with a given rank. The Trick: Choose a suitable heap or partition method based on the input and explain its complexity. What It Tests: Algorithm selection under time pressure.

What Comes After the Online Assessment

A recruiter or technical evaluator usually screens candidates before coding, language, and low-level design interviews and a team conversation. C++ candidates go deeper into memory, concurrency, and implementation details. Quantitative tracks continue with probability and trading-related reasoning. Keep preparation for each track separate.

Conclusion

Complete solutions that are secure and reliable early, then use your final minute to check for hidden cases. Use Lodely to apply the same focus to SIG coding and design interviews.