Other roles at Carta:Software EngineerProduct ManagerSales
Carta logo

Enterprise · Software Engineer Interview Guide

Sign up to see ATSHeadquartered in United States

Interview language: English

How to Pass the Carta Software Engineer Interview in 2026

The Carta DNA (TL;DR)

Carta's 'create more owners' mission drives the interview loop to assess an individual's capacity to simplify complex equity and valuation concepts. Interviewers look for clear articulation of thought processes when navigating scenarios related to cap table management and fund administration.
Interviews inPythonJavaScriptTypeScript

The Carta Interview Loop

Your onsite loop will typically consist of 5 rounds.

  1. 1

    Round 1

    Recruiter Screen
    Motivation, role fit, logistics.
  2. 2

    Round 2

    Coding Screen
    LeetCode-medium algorithmic problems under time pressure.
  3. 3

    Round 3

    System Design
    Distributed systems, trade-offs at scale, architecture under constraints.
  4. 4

    Round 4

    Onsite Coding
    LeetCode-hard, debugging, code clarity, edge cases.
  5. 5

    Round 5

    Behavioral / Leadership
    Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

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

  • Focusing only on compensation or title without mentioning alignment with Carta's mission or product.
  • Incorrectly managing two heaps (min-heap and max-heap) leading to unbalanced sizes or incorrect median calculation.
  • Incorrectly implementing the FIFO logic, leading to wrong cost basis calculations.
  • API design that is inefficient for querying historical round data or complex allocations.

Test Yourself: Real Carta Questions

Three real prompts pulled from our database.

Type · architecture

Carta needs to support multiple funding rounds for a single company, each with different share classes, prices, and investor allocations. Design the database schema and API endpoints to manage this complexity efficiently and accurately.

Type · code-review

Review the following code snippet intended to calculate the total number of options granted. Identify potential issues, suggest improvements for clarity, efficiency, and robustness. ```javascript function calculateTotalOptions(grants) { let total = 0; for (let i = 0; i < grants.length; i++) { if (grants[i].type === 'option') { total += grants[i].quantity; } } return total; } ```

Type · debugging

Here is a Python function intended to calculate the total value of a portfolio given a list of holdings (symbol, quantity, price). It has a bug. Find and fix it. ```python def calculate_portfolio_value(holdings): total_value = 0 for holding in holdings: symbol, quantity, price = holding total_value += quantity * price # Potential bug here return total_value # Example usage: portfolio = [('AAPL', 100, 150.0), ('GOOG', 50, 2500.0)] print(calculate_portfolio_value(portfolio)) ```

+ many more questions, signals, and worked examples

Sign up to unlock the full Carta grading rubric

Unlock the Carta rubric, free

Carta Interview Question Bank

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

9 of 13 questions shown

1

Recruiter Screen

1
  1. 1

    Type · motivation

    What interests you about working at Carta, specifically within the fintech space and our mission to help companies manage their cap tables and valuations?
2

Coding Screen

3
  1. 2

    Type · algorithmic

    Given a list of stock transactions (buy/sell with price and quantity), write a function to calculate the total realized gain or loss for a specific period. Assume FIFO (First-In, First-Out) accounting for cost basis.
  2. 3

    Type · algorithmic

    Design a data structure that supports adding a number, removing a number, and retrieving the median of all numbers currently in the structure in O(log n) time. You can assume the numbers are integers.
  3. + 1 more questions in this round (sign up to unlock)
3

System Design

3
  1. 4

    Type · architecture

    Design a system to track and display real-time stock price changes for a large number of companies. Consider data ingestion, storage, and delivery to a web client. How would you handle potential spikes in demand?
  2. 5

    Type · architecture

    Carta needs to support multiple funding rounds for a single company, each with different share classes, prices, and investor allocations. Design the database schema and API endpoints to manage this complexity efficiently and accurately.
  3. + 1 more questions in this round (sign up to unlock)
4

Onsite Coding

3
  1. 6

    Type · algorithmic

    Implement a function `get_vesting_schedule(grant_date, cliff_months, duration_months, vesting_frequency_months)` that calculates the number of vested shares at each vesting interval for a stock option grant. The function should return a list of tuples `(vesting_date, vested_shares)`.
  2. 7

    Type · coding

    Write a function `parse_cap_table_csv(csv_string)` that takes a CSV string representing a company's cap table and returns a structured representation (e.g., a list of dictionaries). The CSV can have varying columns, but always includes 'security_type', 'owner_name', and 'shares'. Handle potential errors like missing required columns or malformed rows.
  3. + 1 more questions in this round (sign up to unlock)
5

Behavioral / Leadership

3
  1. 8

    Type · past-experience

    Tell me about a time you had to make a significant technical decision with incomplete information. How did you approach it, what was the outcome, and what did you learn?
  2. 9

    Type · past-experience

    Describe a complex bug you encountered in a production system related to financial calculations or data integrity. Walk me through your debugging process, how you identified the root cause, and what steps you took to prevent recurrence.
  3. + 1 more questions in this round (sign up to unlock)

Unlock all 13 Carta questions, free

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

Unlock all 13 Carta questions

Interview tracks at Carta

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

See Software Engineer salaries by country

Compare Carta with similar employers

Same DNA, different bar. Browse the closest companies in our database and see how their loops differ.

Nexi logo
5 rounds

Nexi

Same tier

Nexi values candidates demonstrating strong analytical and problem-solving skills within complex fintech environments...

See Nexi interview questions

Flow Traders logo
4 rounds

Flow Traders

Same tier

"Flow Traders Entrepreneurs" drives a loop that prioritizes raw quantitative speed and immediate risk calculation. In...

See Flow Traders interview questions

Optiver logo
5 rounds

Optiver

Same tier

Optiver's infamous 80-in-8 mental math test anchors the early screen, signaling their obsession with raw computationa...

See Optiver interview questions

Practice Carta interviews end-to-end

Carta Mock Interview

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

Open

STAR Stories for Carta Behavioral Rounds

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

Open

Carta Interview Prep Hub

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

Open

Interview Frameworks

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

Open

Sample answers

What a strong answer to these Carta interview questions shows.

Carta needs to support multiple funding rounds for a single company, each with different share classes, prices, and investor allocations. Design the database schema and API endpoints to manage this complexity efficiently and accurately.

A strong answer shows: Well-structured schema with clear entities (Company, Round, ShareClass, Investor, Allocation).; Handles relationships correctly (e.g., one-to-many, many-to-many).; Considers historical data and point-in-time queries.; Designs intuitive and efficient API endpoints.; Discusses trade-offs of different database choices..

Review the following code snippet intended to calculate the total number of options granted. Identify potential issues, suggest improvements for clarity, efficiency, and robustness. ```javascript function calculateTotalOptions(grants) { let total = 0; for (let i = 0; i < grants.length; i++) { if (grants[i].type === 'option') { total += grants[i].quantity; } } return total; } ```

A strong answer shows: Identifies potential issues like `grants[i]` being undefined or `quantity` not being a number.; Suggests using `Array.prototype.reduce` for a more concise solution.; Discusses error handling for invalid grant objects or missing properties.; Considers the efficiency for large datasets.; Provides constructive feedback..

Frequently asked questions

WorkfiveExplore careers on Workfive →

Unlock the free Carta interview guide

Sign up