# Software Engineer
**Role:** Software Engineer · **Level:** SDE 1
**Company:** [Cashfree](https://scaleengineer.com/companies/cashfree)
**Difficulty:** Medium
**Salary:** US$100000 - US$150000
**Experience:** 0 - 2
**Timeline:** ~7 days
This interview process is designed to assess candidates for the Software Engineer (SDE 1) role at Cashfree. It evaluates technical proficiency, problem-solving skills, and cultural fit.
Canonical: https://scaleengineer.com/interviews/cashfree/sde-1-software-engineer
---
## Overall evaluation

- Technical Skills
- Behavioral and Cultural Fit

## Questions asked

- Write a function to reverse a linked list.
- Given an array of integers, find the two numbers that add up to a specific target.
- Explain the difference between a process and a thread.
- What is polymorphism?
- Describe a situation where you had to deal with a difficult stakeholder.
- How would you design a URL shortener service?
- What are the advantages of using a NoSQL database over a relational database?
- Tell me about a time you failed and what you learned from it.

## Preparation tips

### lists

- Brush up on fundamental data structures and algorithms.
- Practice coding problems on platforms like LeetCode, HackerRank, or GeeksforGeeks.
- Understand core computer science concepts (OS, DBMS, Networking).
- Review object-oriented programming (OOP) principles.
- Prepare to discuss your past projects in detail, focusing on your contributions and learnings.
- Research Cashfree's products, services, and company culture.
- Prepare answers to common behavioral questions using the STAR method (Situation, Task, Action, Result).
- Be ready to explain your thought process clearly during coding challenges.

### studyPlan

- {"title":"Data Structures and Algorithms","longDescription":"Weeks 1-2: Focus on fundamental data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and their common algorithms. Practice problems related to time and space complexity analysis.","shortDescription":"Weeks 1-2: Data Structures & Algorithms Fundamentals"}
- {"title":"Algorithms","longDescription":"Week 3: Deep dive into sorting and searching algorithms. Understand their implementations and complexities. Practice problems involving these algorithms.","shortDescription":"Week 3: Sorting & Searching Algorithms"}
- {"title":"Computer Science Fundamentals","longDescription":"Week 4: Review core computer science concepts like Operating Systems (processes, threads, memory management), Database Management Systems (SQL, normalization), and Computer Networks (TCP/IP, HTTP).","shortDescription":"Week 4: Core CS Concepts"}
- {"title":"Object-Oriented Programming","longDescription":"Week 5: Focus on Object-Oriented Programming (OOP) principles (Encapsulation, Inheritance, Polymorphism, Abstraction) and design patterns. Practice coding in your preferred language.","shortDescription":"Week 5: OOP & Design Patterns"}
- {"title":"Behavioral and Company Fit","longDescription":"Week 6: Prepare for behavioral questions. Think about your past experiences and how to articulate them using the STAR method. Research Cashfree's values and mission.","shortDescription":"Week 6: Behavioral Prep & Company Research"}
- {"title":"Practice and Review","longDescription":"Week 7: Mock interviews and final review. Practice coding problems under timed conditions and refine your explanations. Ensure you have clear questions to ask the interviewer.","shortDescription":"Week 7: Mock Interviews & Final Review"}

## Location differences

- {"location":"Bangalore","differences":{"tips":["Research Cashfree's presence and projects in this specific location.","Be prepared to discuss how your skills align with local business needs.","Practice articulating your thoughts clearly and concisely."],"interviewFocus":["Adaptability to local work culture","Communication skills in the local language (if applicable)","Understanding of local market trends"],"commonQuestions":["Tell me about a challenging project you worked on.","How do you handle tight deadlines?","Describe a time you disagreed with a team member."]}}
- {"location":"Remote","differences":{"tips":["Highlight your experience with remote collaboration tools (e.g., Slack, Zoom, Jira).","Showcase your ability to work autonomously and deliver results.","Be prepared to discuss your home office setup and internet connectivity."],"interviewFocus":["Self-management and proactiveness","Effective communication in a remote setting","Collaboration tools and strategies"],"commonQuestions":["What are your thoughts on remote work policies?","How do you stay motivated when working independently?","Describe your experience with distributed teams."]}}

## Round 1: Coding and Data Structures Round
**Type:** Technical Interview · **Difficulty:** Easy · **Duration:** 45 min
Assess foundational coding and DSA skills.
This round focuses on assessing your foundational programming skills and your understanding of basic data structures and algorithms. You will be asked to write code to solve a few problems, and your ability to explain your thought process and the efficiency of your solution will be evaluated.
**Interviewers look for:** Clean and efficient code; Logical thinking; Ability to explain their solution; Basic understanding of algorithms
**Evaluation criteria:** Basic coding ability; Understanding of fundamental data structures; Problem-solving approach; Communication clarity
**Common rejection reasons:** Inability to solve basic coding problems.; Poor understanding of fundamental data structures.; Lack of clarity in explaining code or logic.; Negative attitude or poor communication.
## Questions

- Find the missing number in a given array of integers from 1 to N.
- Implement a function to check if a string is a palindrome.
- Given two sorted arrays, merge them into a single sorted array.

## Preparation tips

- Practice coding problems on platforms like LeetCode (Easy/Medium).
- Review array, string, linked list, and tree manipulations.
- Understand time and space complexity (Big O notation).

## Round 2: Advanced Coding and Algorithms Round
**Type:** Technical Interview · **Difficulty:** Medium · **Duration:** 60 min
Assess advanced coding and algorithmic problem-solving.
This round delves deeper into your problem-solving abilities with more complex coding challenges. You'll be expected to demonstrate a strong grasp of various data structures and algorithms, and to optimize your solutions for efficiency.
**Interviewers look for:** Efficient and well-structured code; Understanding of trade-offs between different approaches; Ability to debug and test code; Knowledge of common algorithmic paradigms (e.g., dynamic programming, greedy algorithms)
**Evaluation criteria:** Proficiency in data structures and algorithms; Problem-solving and analytical skills; Code optimization; Ability to handle edge cases
**Common rejection reasons:** Inability to solve medium-difficulty coding problems.; Lack of knowledge in advanced data structures or algorithms.; Poor optimization of solutions.; Difficulty in explaining complex logic.
## Questions

- Given a binary tree, find its inorder traversal.
- Find the longest substring without repeating characters.
- Implement a function to find the kth smallest element in a binary search tree.

## Preparation tips

- Practice LeetCode Medium problems.
- Focus on trees, graphs, dynamic programming, and greedy algorithms.
- Understand how to analyze and improve time and space complexity.

## Round 3: System Design Round
**Type:** System Design Interview · **Difficulty:** Medium · **Duration:** 60 min
Assess system design and architectural thinking.
In this round, you will be presented with a high-level problem and asked to design a system to solve it. This could involve designing a social media feed, a URL shortener, or a notification service. The focus is on your ability to think about scalability, reliability, and trade-offs.
**Interviewers look for:** Ability to break down complex problems; Knowledge of distributed systems concepts; Understanding of common design patterns; Clear articulation of design decisions
**Evaluation criteria:** System design thinking; Scalability and performance considerations; Database design; API design; Trade-off analysis
**Common rejection reasons:** Lack of understanding of system design principles.; Inability to design scalable and reliable systems.; Poor communication of design choices.; Not considering trade-offs and constraints.
## Questions

- Design a URL shortening service like TinyURL.
- Design a system to count the number of views for a YouTube video.

## Preparation tips

- Study system design concepts (load balancing, caching, databases, message queues).
- Read about common system design interview questions and solutions.
- Practice designing systems on paper or a whiteboard.
- Understand the CAP theorem and its implications.

## Round 4: Behavioral and HR Round
**Type:** Behavioral Interview · **Difficulty:** Easy · **Duration:** 30 min
Assess behavioral competencies and cultural fit.
This is a behavioral interview where the focus is on understanding your past experiences, how you handle different situations, and your overall fit with Cashfree's culture. You'll be asked questions about your strengths, weaknesses, teamwork, and career aspirations.
**Interviewers look for:** Positive attitude; Good communication and interpersonal skills; Alignment with company values; Enthusiasm for the role and company
**Evaluation criteria:** Communication skills; Teamwork and collaboration; Problem-solving approach; Motivation and career goals; Cultural alignment
**Common rejection reasons:** Poor communication skills.; Lack of enthusiasm or motivation.; Negative attitude towards past experiences.; Not a good cultural fit.; Unrealistic salary expectations.
## Questions

- Tell me about yourself.
- Describe a time you faced a conflict in a team and how you resolved it.
- What are your strengths and weaknesses?
- Why do you want to work at Cashfree?

## Preparation tips

- Prepare answers to common behavioral questions using the STAR method.
- Research Cashfree's values and mission.
- Be ready to talk about your career goals and why you're interested in Cashfree.
- Prepare thoughtful questions to ask the interviewer.