Two Sigma Online Assessment
Two Sigma's OA is an auto-graded coding screen that draws from a small, stable canon and differs by track - a 3-problem data-science set for Quant Research and a rotating 2-problem set for SWE.
Software Engineering — SWE / NG SWE / SDE
Two coding problems drawn from a small rotating pool that stayed stable for years before the late-2025 refresh.
- Initial Public Offering (IPO) Coding · medium
- Sewer (Split Tree) Coding · medium
- Pythagorean Triples in a Tree Coding · medium
- Server Traffic Monitor Coding · medium
- Maximum Throughput Coding · medium
Software Engineering — SWE / NG SWE / SDE (2026 refresh)
The first genuine SWE refresh in years - a new fixed pair introduced in late 2025.
- Count balanced splits of a bracket string with wildcards Coding · hard
- Count Analogous Arrays Coding · medium
Software Engineering — SWE / SDE intern (CodeSignal)
A separate proctored CodeSignal screen for some 2021 intern cycles, drawing four randomized problems per candidate.
- canMakeTriangle Coding · easy
- bubblesPopping2 Coding · medium
- Two-sum with updates Coding · hard
- Three-distinct-char substrings Coding · easy
- Matrix diamond (Manhattan-radius) sum Coding · medium
Quant Research / Data Science — Quant Research / Data Science
A frozen three-problem data-science set candidates report verbatim as still those three for roughly six years running.
- Linear Interpolator Coding · medium
- NYC Daily Temperature by Town Regression · medium
- Lasso bonus - 5 most predictive towns Regression · medium
Quant Research / Data Science — Quant Research (legacy folklore set)
The pre-2019 QR canon was a friends-circle (connected-components) problem plus a longest-chain pair, replaced by the interpolation + temperature set around 2019-2020. Practice the legacy style below.
- Friends circle (connected components) Coding · medium · free
- Longest chain Coding · medium
Two Sigma OA — FAQ
What is the Two Sigma online assessment?
Two Sigma's OA is an auto-graded coding screen that draws from a small, stable canon and differs by track - a 3-problem data-science set for Quant Research and a rotating 2-problem set for SWE.
What is the format of the Two Sigma OA?
It runs as 5 tracks (SWE / NG SWE / SDE, SWE / NG SWE / SDE (2026 refresh), SWE / SDE intern (CodeSignal), Quant Research / Data Science, Quant Research (legacy folklore set)). Software Engineering, Software Engineering, Software Engineering, Quant Research / Data Science — each timed, auto-graded where applicable.
How do I practice for the Two Sigma online assessment?
Work the sample questions above (each with a full worked solution), then take the interactive Two Sigma OA practice on QuantVault. For the full interview, see the Two Sigma interview-questions set.