What does SIG ask in software engineer interviews?

SIG SWE interviews typically cover data structures and algorithms, system design, and behavioral questions. Candidates report coding rounds using LeetCode-style problems, plus architecture design and leadership questions for senior roles. LeakCode aggregates verified reports from 31+ candidates.

How many rounds does SIG have in its interview process?

The SIG interview process typically includes a recruiter screen, a phone/online assessment round, and 4-5 onsite or virtual interviews covering coding, system design, and behavioral competencies. The exact number of rounds varies by role and team.

How hard is it to get a job at SIG?

SIG is highly selective. Candidates report pass rates in the single digits for competitive engineering roles. Strong data structures fundamentals, system design ability, and clear communication are required to advance past initial screens.

What topics should I study for a SIG interview?

Based on aggregated SIG interview reports: arrays and hash maps, trees and graphs, dynamic programming, system design (distributed systems, databases, caching), and behavioral questions using the STAR method. LeakCode shows exactly which topics appear most often.

Does SIG ask LeetCode hard questions?

Interview difficulty at SIG varies. Coding rounds typically include medium to hard difficulty algorithmic problems. System design questions are open-ended and evaluated on depth of reasoning. Browse real SIG interview questions on LeakCode to see the actual difficulty distribution.

SIG Interview Questions (2026-2027)

4 questions · 17 experiences · Reddit (9) · 1p3a (5) · InterviewDB (4) · LeetCode (3)

By year: 2026 2025 2023 2022

Read our SIG interview guide

Browse by role

Software Engineer 10

Find Tickers: Extract Stock Ticker Symbols from Unstructured Text

Onsite

Question Details

Problem

Given a block of unstructured text (e.g., a financial news article), extract all valid US stock ticker symbols. A ticker is 1-5 uppercase letters. However, not every sequence of uppercase letters is a ticker — you must filter using a provided set of known valid tickers.

python
def find_tickers(
    text: str,
    valid_tickers: set[str]
) -> list[str]:
    """Return list of tickers found, in order of first appearance, deduplicated."""
    ...

text = "Investors are watching AAPL and GOOGL closely. The FDA approved MRNA."
valid_tickers = {"AAPL", "GOOGL", "MRNA", "TSLA"}

**Output**: ["AAPL", "GOOGL", "MRNA"]

Follow-ups

How do you distinguish the ticker I (Intelsat) from the word "I" in normal English text? What heuristics help?
Tickers can appear with punctuation around them (e.g., "(AAPL)", "AAPL,"). How does your regex handle this?
The valid_tickers set has 10,000 entries. Does set lookup remain O(1) in Python? How does this affect overall complexity?
A new ticker was listed today and is not yet in valid_tickers. How would you keep your ticker list fresh without manual updates?

Free preview. Unlock all questions →