# Software Engineer
**Role:** Software Engineer · **Level:** SDE2
**Company:** [Cashfree](https://scaleengineer.com/companies/cashfree)
**Difficulty:** Medium to Hard
**Salary:** US$100000 - US$150000
**Experience:** 2 - 5
**Timeline:** ~7 days
This interview process is for a Software Engineer (SDE2) role at Cashfree, focusing on assessing technical skills, problem-solving abilities, and cultural fit.
Canonical: https://scaleengineer.com/interviews/cashfree/sde2-software-engineer
---
## Overall evaluation

- Technical Skills
- System Design & Architecture
- Behavioral & 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.
- Design a URL shortening service like TinyURL.
- Explain the difference between SQL and NoSQL databases.
- How would you design a system to handle millions of concurrent users?
- Describe a challenging technical problem you faced and how you solved it.
- Tell me about a time you disagreed with a team member and how you handled it.
- What are your strengths and weaknesses as a software engineer?
- How do you stay updated with new technologies?

## Preparation tips

### lists

- Brush up on fundamental data structures and algorithms.
- Practice coding problems regularly, focusing on efficiency and clarity.
- Review core computer science concepts (OS, DBMS, Networking).
- Understand object-oriented programming principles.
- Prepare for system design questions by studying common architectures and trade-offs.
- Be ready to discuss your past projects and experiences in detail.
- Research Cashfree's products, services, and company culture.
- Prepare behavioral questions using the STAR method (Situation, Task, Action, Result).

### studyPlan

- {"title":"Data Structures & Algorithms","longDescription":"Weeks 1-2: Focus on Data Structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Tables) and Algorithms (Sorting, Searching, Dynamic Programming, Greedy Algorithms). Practice problems on LeetCode (Easy/Medium).","shortDescription":"Weeks 1-2: Data Structures & Algorithms (DSA) fundamentals. Practice Easy/Medium LeetCode."}
- {"title":"System Design","longDescription":"Weeks 3-4: Dive into System Design concepts. Study topics like scalability, load balancing, caching, databases (SQL vs NoSQL), microservices architecture, and API design. Review common system design interview patterns.","shortDescription":"Weeks 3-4: System Design basics. Study scalability, databases, microservices."}
- {"title":"Programming Language & OOP","longDescription":"Week 5: Focus on core programming language concepts (e.g., Java, Python) and object-oriented design principles. Prepare for questions related to concurrency and multithreading if applicable.","shortDescription":"Week 5: Language fundamentals & OOP. Concurrency basics."}
- {"title":"Behavioral & Company Fit","longDescription":"Week 6: Prepare for behavioral and situational questions. Reflect on past projects and experiences, and practice answering using the STAR method. Research Cashfree's values and mission.","shortDescription":"Week 6: Behavioral questions & company research. STAR method."}
- {"title":"Final Preparation","longDescription":"Week 7: Mock interviews and final review. Practice coding problems under timed conditions and simulate interview scenarios. Review all topics covered.","shortDescription":"Week 7: Mock interviews & final review. Timed coding practice."}

## Location differences

- {"location":"India","differences":{"tips":["Be prepared to discuss your projects in detail, highlighting your contributions.","Practice coding problems on platforms like LeetCode and HackerRank.","Understand the fundamentals of computer science and software engineering principles."],"interviewFocus":["Strong emphasis on data structures and algorithms.","Practical application of coding skills in real-world scenarios.","Understanding of distributed systems and microservices architecture."],"commonQuestions":["Questions related to specific technologies prevalent in the Indian market (e.g., Java, Spring Boot, Microservices).","Case studies on scaling applications for a large user base.","Discussions on local market trends and their impact on software development."]}}
- {"location":"USA","differences":{"tips":["Familiarize yourself with cloud computing concepts and services.","Prepare for system design questions by studying common patterns and trade-offs.","Highlight experience with international teams and projects."],"interviewFocus":["System design and architecture.","Scalability and performance optimization.","Experience with cloud platforms and services."],"commonQuestions":["Questions on cloud-native technologies (AWS, Azure, GCP).","System design challenges for global scalability.","Discussions on international best practices in software development."]}}

## Round 1: Coding Round
**Type:** Technical Screening (Coding) · **Difficulty:** Medium · **Duration:** 45 min
Assess core coding skills with 1-2 data structure and algorithm problems.
This initial round focuses on assessing your core technical skills. You will be asked to solve 1-2 coding problems, typically involving data structures and algorithms. The interviewer will evaluate your problem-solving approach, coding proficiency, and understanding of algorithmic concepts. Expect questions on arrays, strings, linked lists, trees, and basic dynamic programming.
**Interviewers look for:** Logical thinking; Ability to translate requirements into code; Understanding of time and space complexity; Clean and efficient coding practices
**Evaluation criteria:** Correctness of the solution; Efficiency of the solution (time and space complexity); Code readability and maintainability; Problem-solving approach
**Common rejection reasons:** Inability to solve basic coding problems.; Poor understanding of fundamental data structures and algorithms.; Lack of clarity in thought process.; Inability to explain the solution.
## Questions

- Find the kth smallest element in a binary search tree.
- Implement a function to check if a string is a palindrome.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank, or GeeksforGeeks.
- Focus on understanding the time and space complexity of your solutions.
- Write clean, well-commented code.
- Be prepared to explain your thought process clearly.

## Round 2: System Design Round
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Design a scalable system, focusing on architecture, databases, and trade-offs.
This round focuses on your ability to design and architect scalable and reliable software systems. You will be given an open-ended problem (e.g., design a URL shortener, a social media feed, a chat application) and asked to propose a solution. The interviewer will probe your understanding of distributed systems, databases, caching, load balancing, and API design.
**Interviewers look for:** Ability to design complex systems from scratch.; Understanding of trade-offs in system design.; Knowledge of distributed systems principles.; Experience with large-scale applications.
**Evaluation criteria:** Scalability of the proposed design; Robustness and fault tolerance; Choice of appropriate technologies and data stores; Clarity of explanation and justification of design decisions
**Common rejection reasons:** Inability to design scalable systems.; Poor understanding of distributed systems concepts.; Lack of consideration for edge cases and failure scenarios.; Inability to articulate design choices and trade-offs.
## Questions

- Design a system like Twitter's news feed.
- Design a rate limiter.

## Preparation tips

- Study common system design patterns and architectures.
- Understand concepts like CAP theorem, eventual consistency, and ACID properties.
- Practice designing systems for scale, considering factors like traffic, data volume, and latency.
- Be prepared to discuss trade-offs and justify your design choices.

## Round 3: Managerial Round
**Type:** Behavioral / Managerial Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess soft skills, teamwork, and cultural fit through behavioral questions.
This round assesses your behavioral and situational competencies, as well as your overall fit with the team and company culture. You'll be asked questions about your past experiences, how you handle specific situations (e.g., conflicts, failures, successes), and your career goals. The interviewer aims to understand your soft skills, leadership potential, and how you align with Cashfree's values.
**Interviewers look for:** How you handle challenges and conflicts.; Your ability to work in a team.; Your motivation and career aspirations.; Your understanding of the role and company.
**Evaluation criteria:** Communication clarity; Teamwork and collaboration skills; Problem-solving approach in past experiences; Cultural fit and alignment with company values
**Common rejection reasons:** Poor communication skills.; Lack of alignment with company values.; Inability to provide specific examples for behavioral questions.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you had to deal with a difficult stakeholder.
- Describe a project you are particularly proud of and your role in it.
- How do you handle constructive criticism?

## Preparation tips

- Prepare examples using the STAR method (Situation, Task, Action, Result).
- Be honest and authentic in your responses.
- Show enthusiasm for the role and the company.
- Ask thoughtful questions about the team, role, and company culture.