Quicko 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 help businesses automate workflows, manage data, and integrate with other services. Day to day, they write code for features, fix bugs, review peers' code, and work with product and customer teams to ship improvements quickly. At fast-growing firms like Quicko, expect to touch multiple parts of the stack and learn domain-specific problems such as tax, compliance, or fintech workflows.

Role and technical knowledge

1. 1

   Explain the difference between SQL and NoSQL databases. Which would you choose for a B2B SaaS product that stores customer invoices and why?

   Cover consistency, schema flexibility, and scaling. For invoices, a relational database is often better due to transactions and structured data.

2. 2

   What is a REST API? How would you design an endpoint for a SaaS tool that lets users fetch their tax filing status?

   Mention HTTP methods, status codes, and resource naming. A strong answer outlines GET /filings/{id}/status with authentication and proper error handling.

3. 3

   How does multi-tenancy work in a SaaS application? What are the trade-offs of shared vs isolated databases?

   Discuss tenant isolation, cost, and complexity. Shared databases are cheaper but need row-level security; isolated ones are safer but costlier.

4. 4

   What happens when you type a URL in the browser and press Enter? Focus on parts relevant to a web app like a B2B dashboard.

   Cover DNS, TCP, HTTP request/response, and rendering. Emphasise how frontend and backend interact for a logged-in user.

Practical scenarios and problem solving

1. 5

   A customer reports that their invoice data is not syncing with your SaaS tool. How would you debug this?

   Start by checking logs, reproducing the issue, and verifying API responses. A strong answer shows a systematic approach from client to server.

2. 6

   You need to add a feature that sends email notifications when a user's tax filing is approved. Outline your approach.

   Cover triggers, background jobs, email service integration, and error handling. Mention idempotency to avoid duplicate emails.

3. 7

   Your team wants to reduce API response time for a dashboard that loads slowly. What steps would you take?

   Suggest profiling, database indexing, caching, and pagination. Prioritise based on measurements rather than guessing.

4. 8

   How would you handle a situation where a third-party API your product depends on changes its response format without notice?

   Talk about versioning, monitoring, fallbacks, and communication with the provider. Show you plan for resilience.

Behavioural and teamwork

1. 9

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

   Use STAR format. Highlight collaboration, listening, and how you reached a solution.

2. 10

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

   Show curiosity and resourcefulness. Mention specific steps like documentation, tutorials, and building a small prototype.

3. 11

   Give an example of a bug you fixed. How did you find it and what did you learn?

   Focus on the debugging process and the lesson learned. Avoid blaming others; emphasise ownership.

4. 12

   How do you prioritise tasks when you have multiple deadlines?

   Mention tools like to-do lists or kanban, and communication with stakeholders. Show you can balance urgency and importance.

HR and company fit

1. 13

   Why do you want to work at a fast-growing SaaS company like Quicko instead of a large service-based IT firm?

   Show interest in product ownership, fast-paced learning, and direct impact. Research the company's domain like tax or fintech.

2. 14

   Where do you see yourself in three years?

   Align your growth with the company's needs. Mention deepening technical skills and taking on more responsibility.

3. 15

   What are your salary expectations?

   Give a range based on market research for freshers in Indian SaaS. Be flexible and mention learning opportunities.

4. 16

   Do you have any questions for us?

   Ask about tech stack, team structure, or onboarding. Avoid questions about salary or leave in this round.