Scale Engineer

Software Engineer

Software EngineerSoftware Engineer IIIMedium to Hard

This interview process for a Software Engineer III at American Express is designed to assess a candidate's technical proficiency, problem-solving abilities, and cultural fit within the company. It typically involves multiple rounds, starting with an HR screening, followed by technical interviews focusing on data structures, algorithms, system design, and behavioral aspects. The goal is to identify engineers who can contribute effectively to complex projects and uphold American Express's standards of innovation and customer service.

Rounds·3

Timeline·~14d

Experience·5 - 8 yrs

Comp band·US$120000 - US$160000

Interview time·150 min

Evaluation

What they measure.

  • Problem-solving skills
  • Algorithmic thinking
  • Data structure knowledge
  • Code quality and efficiency
  • Ability to translate requirements into code

Preparation

How to prepare.

Tips

  1. Thoroughly review fundamental data structures and algorithms.
  2. Practice coding problems, focusing on time and space complexity.
  3. Study system design concepts, including scalability, reliability, and trade-offs.
  4. Prepare examples for common behavioral questions using the STAR method (Situation, Task, Action, Result).
  5. Research American Express's products, services, and company culture.
  6. Understand the technologies commonly used at American Express (e.g., Java, Python, cloud platforms, distributed systems).
  7. Practice explaining your thought process clearly and concisely.
  8. Prepare thoughtful questions to ask the interviewer.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms (DSA) fundamentals. Practice Easy/Medium LeetCode.

Weeks 1-2: Focus on core data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and algorithms (Sorting, Searching, Dynamic Programming, Greedy Algorithms). Practice implementing these and analyzing their time/space complexity. Solve problems on platforms like LeetCode (Easy/Medium).

Questions

Commonly asked.

  • Given an array of integers, find the contiguous subarray with the largest sum.
  • Design a URL shortening service like bit.ly.
  • Explain the difference between processes and threads.
  • Tell me about a time you had to work under a tight deadline.
  • How would you design a system to handle real-time stock price updates for millions of users?
  • What are the advantages of using a NoSQL database over a relational database in certain scenarios?
  • Describe a challenging bug you encountered and how you debugged it.
  • How do you ensure the security of a web application?
  • What is polymorphism and provide an example?
  • Discuss your experience with asynchronous programming.

Locations

Regional differences.

Fig · Regions — 03 locations

01 / 03

Location

New York

Interview focus

Emphasis on practical application of distributed systems concepts.Strong focus on cloud-native technologies (AWS, Azure, GCP).Behavioral questions often probe collaboration in a global team setting.

Common questions

  • Tell me about a time you had to deal with a difficult stakeholder.
  • Describe a complex technical problem you solved and the impact it had.
  • How do you stay updated with the latest technologies in software development?
  • What are your thoughts on microservices vs. monolithic architecture for a large-scale e-commerce platform?
  • Explain the CAP theorem and its implications in distributed systems.

Tips

  • Be prepared to discuss your experience with specific cloud platforms.
  • Highlight projects where you collaborated with international teams.
  • Showcase your understanding of scalability and resilience in system design.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

Med

Data Structures And Algorithms Interview · 45 min · Software Engineer / Senior Software Engineer

This round focuses on your fundamental computer science knowledge. You will be asked to solve coding problems that test your understanding of data structures and algorithms. The interviewer will assess how you approach the problem, your ability to write clean and efficient code, and how well you can explain your thought process and the complexity of your solution.

What they look for

Logical thinkingAbility to break down complex problemsClean and efficient codeUnderstanding of time and space complexity

Evaluation

  • Problem-solving approach
  • Algorithmic efficiency
  • Code correctness
  • Clarity of explanation

Sample questions

  • Reverse a linked list.

    Data StructuresLinked ListsAlgorithms

  • Find the kth smallest element in a Binary Search Tree.

    Data StructuresTreesAlgorithms

  • Implement a function to check if a string is a palindrome.

    StringsAlgorithms

Prep for this round

  1. 01Practice coding problems on platforms like LeetCode, HackerRank, or GeeksforGeeks.
  2. 02Focus on understanding the trade-offs between different data structures and algorithms.
  3. 03Be prepared to write code on a whiteboard or in a shared editor.
  4. 04Practice explaining your solution step-by-step.

Common rejection reasons

  • ×Poor communication of thought process.
  • ×Inability to articulate solutions clearly.
  • ×Lack of fundamental understanding in core CS concepts.
  • ×Failure to consider edge cases or constraints.

DSA

Coding questions at American Express.

Frequently reported on American Express loops

View all at American Express

Other guides

More at American Express.