BharatAgri Full Stack Developer Interview: Rounds, Questions and Preparation

What the job involves

A Full Stack Developer at Indian unicorns or high-growth startups builds and maintains both client-facing and server-side features for products used by millions. You will work across the stack - React or Vue on the frontend, Node.js or Python on the backend, and cloud databases - often shipping features weekly. Expect close collaboration with product, design, and data teams to solve real user problems at scale.

Role and Technical Knowledge

1. 1

   What is the difference between REST and GraphQL, and when would you choose one over the other for a fast-growing startup?

   Explain that REST is simpler for basic CRUD but GraphQL reduces over-fetching for complex mobile clients. Mention startup needs like rapid iteration and bandwidth constraints.

2. 2

   How does the event loop work in Node.js, and why is it important for handling many concurrent users?

   Cover non-blocking I/O, callbacks, promises, and async/await. Relate it to scaling a backend for thousands of simultaneous requests.

3. 3

   Explain how you would design a database schema for a feature like user profiles and activity feeds in a social commerce app.

   Discuss normalization vs denormalization, indexing, and choosing SQL vs NoSQL based on read/write patterns. Mention sharding or caching for scale.

4. 4

   What are React hooks, and how do they change state management compared to class components?

   Describe useState, useEffect, and useContext. Highlight cleaner code and reusable logic, and mention when to use Redux or Zustand.

Practical Scenarios

1. 5

   Your web app is slow for users in rural India with poor internet. How would you improve performance?

   Suggest code splitting, lazy loading, image compression, CDN, and offline-first with service workers. Mention measuring with Lighthouse.

2. 6

   You need to add a real-time notification feature for order updates. How would you implement it?

   Propose WebSockets or server-sent events, a message queue like Redis Pub/Sub, and fallback to polling. Discuss scaling with multiple server instances.

3. 7

   A bug is reported where users sometimes see stale data after updating their profile. How do you debug and fix it?

   Walk through checking cache headers, React state updates, and database read replicas. Suggest cache invalidation strategies and optimistic UI updates.

4. 8

   You have to integrate a third-party payment gateway. What steps do you take from development to production?

   Cover sandbox testing, webhook handling, idempotency, error handling, and security like PCI compliance. Mention logging and monitoring.

Behavioural and HR

1. 9

   Tell me about a time you had to learn a new technology quickly for a project. How did you approach it?

   Use STAR method: describe the situation, the technology, your learning plan, and the outcome. Show self-drive and resourcefulness.

2. 10

   Describe a situation where you disagreed with a teammate on a technical decision. How did you resolve it?

   Focus on data-driven discussion, listening, and compromise. Avoid blaming others; highlight the final solution and team harmony.

3. 11

   Why do you want to work at a high-growth startup like BharatAgri instead of a large MNC?

   Show passion for impact, ownership, and fast-paced learning. Connect to the company's mission, like empowering farmers with technology.

4. 12

   How do you prioritize tasks when you have multiple deadlines and limited time?

   Mention using urgency vs importance, communicating with stakeholders, and breaking work into smaller chunks. Give a concrete example.

System Design and Scalability

1. 13

   Design a URL shortener that can handle 10 million requests per day. What components would you use?

   Cover load balancers, application servers, a key-value store for mappings, and caching. Discuss hash generation and database sharding.

2. 14

   How would you architect a feature that sends daily SMS reminders to farmers about weather and crop prices?

   Propose a cron job or scheduled queue, third-party SMS API, user preference storage, and retry logic. Mention rate limiting and cost control.

3. 15

   What is horizontal vs vertical scaling, and which would you choose for a startup expecting sudden traffic spikes?

   Explain adding more machines vs upgrading one. Favor horizontal for resilience and cost, and mention auto-scaling groups and stateless services.

4. 16

   How do you ensure security in a full stack application, especially for user data?

   Discuss HTTPS, input validation, parameterized queries, JWT or session management, and OWASP top 10. Mention regular audits and least privilege.