Applitools India Software Engineer Interview: Rounds, Questions and Preparation

What the job involves

Software Engineers at Indian SaaS and B2B product companies build and maintain web-based tools that businesses use to automate workflows, manage data, and integrate systems. Day to day, they write code for features, fix bugs, participate in code reviews, and collaborate with product and QA teams to ship reliable software. The work often involves working on multi-tenant architectures, APIs, and cloud deployments.

Role and Technical Knowledge

1. 1

   Explain the difference between a monolithic and a microservices architecture. Which one would you prefer for a SaaS product and why?

   A strong answer defines both, mentions scalability, deployment, and team autonomy, and gives a reasoned preference based on product needs.

2. 2

   How does a REST API work? Describe the HTTP methods and status codes you would use for a typical CRUD operation in a B2B application.

   Cover GET, POST, PUT, DELETE, and common status codes like 200, 201, 400, 404, 500, with examples of when to use each.

3. 3

   What is multi-tenancy in SaaS? How would you design a database schema to support multiple customers on a single instance?

   Explain shared database with tenant ID, separate schemas, or separate databases, and discuss trade-offs in isolation, cost, and maintenance.

4. 4

   Describe how you would implement authentication and authorization for a B2B web application. What are JWTs and OAuth?

   Mention session vs token-based auth, JWT structure, OAuth for third-party access, and role-based access control for different user levels.

Practical Scenarios

1. 5

   You are working on a feature that suddenly causes a performance drop in the production environment. How would you debug and resolve it?

   Outline a systematic approach: check logs, reproduce in staging, use profiling tools, review recent changes, and communicate with the team.

2. 6

   A customer reports that data from their integrated third-party system is not syncing correctly. How would you investigate and fix this issue?

   Discuss checking API logs, validating data formats, testing the integration endpoint, and collaborating with support to gather details.

3. 7

   You need to add a new feature to an existing codebase you are unfamiliar with. What steps would you take to understand the code and implement it?

   Mention reading documentation, exploring code structure, writing small tests, pair programming, and making incremental changes.

4. 8

   How would you ensure your code is testable and maintainable in a fast-paced SaaS environment?

   Talk about unit tests, integration tests, code reviews, modular design, and following coding standards and CI/CD practices.

Behavioural and Situational

1. 9

   Tell me about a time you worked in a team to complete a project. What was your role and how did you handle disagreements?

   Use STAR method, highlight collaboration, active listening, and focus on the project outcome over personal conflict.

2. 10

   Describe a situation where you had to learn a new technology quickly for a project. How did you approach it?

   Show self-learning ability, resourcefulness, and application of the new skill to deliver results under time pressure.

3. 11

   Give an example of a time you received constructive criticism. How did you respond and what did you learn?

   Demonstrate openness to feedback, a growth mindset, and specific actions taken to improve.

4. 12

   How do you prioritize tasks when you have multiple deadlines? Share an instance from your academic or internship experience.

   Explain methods like Eisenhower matrix or agile prioritization, and give a concrete example with outcome.

HR and Company Fit

1. 13

   Why do you want to work in a SaaS product company like Applitools India rather than a services company?

   Show understanding of product development cycles, continuous learning, and impact on a single product used by many customers.

2. 14

   Where do you see yourself in the next three years in terms of technical and career growth?

   Align your goals with the company's growth, mention deepening technical expertise and taking on more responsibility.

3. 15

   What do you know about our company's products and how they fit into the B2B SaaS landscape?

   Research the company's offerings, target customers, and competitors, and relate them to industry trends.

4. 16

   How do you handle working in a fast-paced environment with changing requirements?

   Emphasize adaptability, communication, and focus on delivering value despite ambiguity.