Scale Engineer

Senior Software Engineer I

Software EngineerBand 35Hard

This interview process is for a Senior Software Engineer I (Band 35) position at American Express. It is designed to assess a candidate's technical expertise, problem-solving abilities, system design skills, and cultural fit within the company.

Rounds·3

Timeline·~14d

Experience·5 - 8 yrs

Comp band·US$140000 - US$180000

Interview time·165 min

Evaluation

What they measure.

  • Technical Proficiency: Depth and breadth of knowledge in relevant programming languages, data structures, algorithms, and system design principles.
  • Problem-Solving Skills: Ability to analyze complex problems, devise efficient solutions, and articulate the thought process clearly.
  • System Design: Capability to design scalable, reliable, and maintainable systems, considering trade-offs and best practices.
  • Behavioral Competencies: Communication, teamwork, leadership potential, adaptability, and alignment with Amex values.
  • Experience and Impact: Relevance of past experience to the role and demonstrated impact in previous projects.

Preparation

How to prepare.

Tips

  1. Review core computer science fundamentals: Data Structures, Algorithms, Operating Systems, Databases.
  2. Practice coding problems on platforms like LeetCode, HackerRank, focusing on medium to hard difficulty.
  3. Study system design concepts: Scalability, availability, consistency, load balancing, caching, databases, messaging queues.
  4. Prepare for behavioral questions using the STAR method (Situation, Task, Action, Result).
  5. Research American Express's technology stack, products, and company culture.
  6. Understand common software development methodologies (Agile, Scrum) and CI/CD practices.
  7. Prepare questions to ask the interviewer about the role, team, and company.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms practice.

Weeks 1-2: Focus on Data Structures (Arrays, Linked Lists, Trees, Graphs, Hash Tables) and Algorithms (Sorting, Searching, Dynamic Programming, Greedy Algorithms). Practice coding problems related to these topics on platforms like LeetCode.

Questions

Commonly asked.

  • Tell me about a time you had to deal with a significant technical debt. How did you approach it?
  • Design a URL shortening service like bit.ly.
  • How would you optimize the performance of a slow-running database query?
  • Describe a situation where you disagreed with your manager or a senior engineer. How did you handle it?
  • What are the trade-offs between monolithic and microservices architectures?
  • Explain the concept of eventual consistency.
  • How do you ensure the security of a web application?
  • Tell me about a project you are particularly proud of and your role in it.
  • How would you design a system to handle millions of concurrent users?
  • What are the principles of object-oriented programming?
  • Describe your experience with automated testing and CI/CD pipelines.

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

USA

Interview focus

Deep understanding of distributed systems and scalability.Experience with microservices architecture.Proficiency in cloud-native technologies.Strong problem-solving and debugging skills.Ability to mentor junior engineers.

Common questions

  • How would you design a distributed caching system for a large e-commerce platform?
  • Describe a complex technical challenge you faced and how you overcame it.
  • Discuss your experience with cloud platforms like AWS, Azure, or GCP.
  • Explain the principles of RESTful API design.
  • How do you ensure code quality and maintainability in a large codebase?

Tips

  • Emphasize experience with large-scale systems and high-traffic applications.
  • Be prepared to discuss specific examples of system design and trade-offs.
  • Highlight any contributions to open-source projects or technical leadership.
  • Showcase your understanding of Agile methodologies and CI/CD practices.

Rounds

Round-by-round.

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

Hard

Technical Interview - Coding · 60 min · Software Engineer / Senior Software Engineer

This round focuses on assessing your core programming skills and problem-solving abilities. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will evaluate your approach, the efficiency of your solution, and the quality of your code. Be prepared to think aloud and explain your thought process.

What they look for

Strong problem-solving skills.Proficiency in coding.Understanding of time and space complexity.Ability to write clean, maintainable code.Logical thinking and analytical skills.

Evaluation

  • Correctness of the solution.
  • Efficiency of the solution (time and space complexity).
  • Code quality and readability.
  • Ability to explain the approach and justify design choices.
  • Handling of edge cases and constraints.

Sample questions

  • Given a binary tree, find its inorder traversal.

    Data StructuresTreesRecursion

  • Implement a function to find the k-th smallest element in an unsorted array.

    AlgorithmsSortingQuickselect

  • Given two strings, find the length of the longest common subsequence.

    AlgorithmsDynamic Programming

Prep for this round

  1. 01Practice coding problems regularly.
  2. 02Master common data structures and algorithms.
  3. 03Focus on writing clean, efficient, and well-commented code.
  4. 04Practice explaining your solutions verbally.
  5. 05Be prepared to discuss time and space complexity.

Common rejection reasons

  • ×Inability to articulate thought process clearly.
  • ×Lack of fundamental knowledge in data structures and algorithms.
  • ×Poor coding practices (e.g., inefficient solutions, unreadable code).
  • ×Failure to consider edge cases and constraints.

DSA

Coding questions at American Express.

Frequently reported on American Express loops

View all at American Express

Other guides

More at American Express.