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Growth · Software Engineer Interview Guide

Interview language: English

How to Pass the Decagon Software Engineer Interview in 2026

The Decagon DNA (TL;DR)

Decagon's 'The Polymath Principle' emphasizes candidates' capacity to adapt and excel across diverse technical challenges, especially in leveraging AI for product innovation. They seek individuals who can articulate complex solutions clearly, demonstrating both depth and breadth in their domain.

The Decagon Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Decagon interview outcomes, avoid these common traps:

Focusing solely on compensation or title without mentioning company mission or product.
Using a simple list and iterating through it for each query, leading to O(N) query time.
Not demonstrating a willingness to compromise or consider alternative perspectives.
Not considering the performance impact of feature flag evaluation.

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Every round, the exact grading rubric interviewers score against, all the questions, and unlimited mock-interview practice. Free account, no credit card.

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Test Yourself: Real Decagon Questions

Three real prompts pulled from our database.

Type · algorithmic

Given a list of user login timestamps and a time window, find all users who logged in at least K times within any time window of the specified duration. For example, if K=3 and the window is 5 minutes, find users who logged in 3 times within any 5-minute interval.

Type · conflict resolution

Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?

Type · debugging

A feature is reporting incorrect conversion rates. The code involves calculating ratios based on user actions. Here's a simplified snippet (provide a buggy code snippet). Debug this code and explain your thought process.

+ many more questions, signals, and worked examples

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Decagon Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 15 questions shown

Recruiter Screen

1
Type · motivation
What interests you about working at Decagon, and specifically in a SaaS growth environment?

Coding Screen

2
Type · algorithmic
Given a list of user login timestamps and a time window, find all users who logged in at least K times within any time window of the specified duration. For example, if K=3 and the window is 5 minutes, find users who logged in 3 times within any 5-minute interval.
3
Type · algorithmic
You are given a stream of user events, where each event has a user ID and a timestamp. Design a data structure that can efficiently return the number of unique users who performed an action within the last N minutes.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · architecture
Design a system to track and display real-time user engagement metrics (e.g., active users, feature usage, session duration) for a SaaS product with millions of daily active users.
5
Type · architecture
Design a rate limiter for API requests in a multi-tenant SaaS application. Consider different strategies (e.g., token bucket, leaky bucket) and how to handle per-tenant limits.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · algorithmic
Implement a function that takes a list of user IDs and their associated feature usage counts, and returns the top K features based on the total usage count across all users. Handle potential ties.
7
Type · code-quality
Refactor the following code (provide a poorly written, but functional code snippet for a common SaaS task like data validation or API response formatting) to improve its readability, maintainability, and efficiency. Explain your changes.
+ 1 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · ownership
Tell me about a time you took ownership of a complex technical problem or project that wasn't explicitly assigned to you. What was the situation, what did you do, and what was the outcome?
9
Type · collaboration
Describe a situation where you had a technical disagreement with a colleague or team lead. How did you approach the discussion, and what was the resolution?
+ 3 more questions in this round (sign up to unlock)

Unlock all 15 Decagon questions, free

No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.

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Interview tracks at Decagon

How Decagon's DNA translates across functions. Pick your role.

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Practice Decagon interviews end-to-end

Decagon Mock Interview

Run a live mock interview with our AI interviewer using Decagon-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.

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STAR Stories for Decagon Behavioral Rounds

Build a Story Bank of your past wins, mapped to the leadership signals Decagon interviewers grade on. Reuse them across every behavioral round.

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Decagon Interview Prep Hub

The frameworks behind every Decagon round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.

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Interview Frameworks

CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Decagon interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.

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Sample answers

What a strong answer to these Decagon interview questions shows.

A strong answer shows: Ability to identify and apply sliding window pattern.; Efficient use of data structures (e.g., hash maps, queues).; Clear handling of time intervals and boundary conditions..

Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?

A strong answer shows: Objective description of the conflict and differing viewpoints.; Proactive steps taken to understand and address the disagreement.; Focus on finding a mutually agreeable solution or understanding..

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