Pristyn Care Software Engineer Interview: Rounds, Questions and Preparation

What the job involves

Software Engineers at Indian unicorns and high-growth startups like Pristyn Care build and maintain scalable web and mobile applications that power core business operations, from patient booking and teleconsultation to supply chain and internal dashboards. They work across the stack, write clean code, debug production issues, and collaborate with product and operations teams to ship features quickly in a fast-paced environment.

Role and Technical Knowledge

1. 1

   Explain the difference between a monolithic and microservices architecture. Which one would you choose for a healthcare startup like Pristyn Care and why?

   A strong answer covers pros and cons of each, and suggests microservices for scalability and independent deployment, but acknowledges that a monolith may be simpler for early-stage products.

2. 2

   How would you design a database schema for a patient appointment booking system?

   Mention tables for patients, doctors, appointments, and slots, with appropriate primary and foreign keys, and discuss normalization and indexing for query performance.

3. 3

   What are RESTful APIs? How would you design an API for a teleconsultation feature?

   Explain REST principles like statelessness and resource-based URLs, and outline endpoints for creating, retrieving, and updating consultations, including authentication.

4. 4

   Explain the concept of time complexity. How would you optimize a function that finds the nearest available doctor from a list?

   Define Big O notation, and suggest using sorting or a priority queue to reduce time complexity from O(n^2) to O(n log n) or better.

Practical Scenarios

1. 5

   You are working on a feature to send SMS reminders for appointments. The SMS service is failing intermittently. How would you debug and handle this?

   Discuss checking logs, reproducing the issue, adding retries with exponential backoff, and using a fallback or queue to ensure reliability.

2. 6

   Your team needs to add a new payment gateway for online consultations. What steps would you take from requirement gathering to deployment?

   Cover understanding requirements, choosing a gateway, integrating APIs, writing tests, handling security and compliance, and deploying with monitoring.

3. 7

   A bug is reported where users in a certain city cannot book appointments. How would you approach fixing it?

   Suggest reproducing the issue, checking location-based logic, database queries, and third-party services, then writing a fix and adding a regression test.

4. 8

   You have to improve the performance of a slow dashboard that loads patient data. What optimizations would you consider?

   Mention database indexing, query optimization, caching, pagination, and front-end lazy loading, and measuring before and after.

Behavioural and HR

1. 9

   Why do you want to join a high-growth startup like Pristyn Care instead of a large MNC?

   Show enthusiasm for fast-paced learning, ownership, and impact, and connect your skills to the company's mission in healthcare.

2. 10

   Describe a time when you had to learn a new technology quickly for a project. How did you manage?

   Use the STAR method: describe the situation, the technology, your learning approach, and the outcome, highlighting self-motivation.

3. 11

   Tell me about a time you faced a conflict in a team project. How did you resolve it?

   Focus on communication, empathy, and finding a middle ground, and emphasize the positive result and what you learned.

4. 12

   Where do you see yourself in the next three years?

   Align your growth with the company's needs, showing a desire to take on more responsibility and contribute to scalable solutions.

Problem Solving and Coding

1. 13

   Given a list of appointment intervals, find the maximum number of non-overlapping appointments a doctor can take.

   This is a classic interval scheduling problem; sort by end time and use a greedy approach, explaining the logic clearly.

2. 14

   Write a function to detect if a string of parentheses is balanced. How would you extend it to handle multiple types of brackets?

   Use a stack for balanced parentheses, and for multiple types, push opening brackets and match with closing ones, handling edge cases.

3. 15

   How would you find the first non-repeating character in a string? Discuss time and space complexity.

   Use a hash map to count frequencies, then iterate to find the first with count 1, achieving O(n) time and O(1) space for fixed alphabet.

4. 16

   Explain how you would implement a LRU cache. What data structures would you use?

   Combine a hash map and a doubly linked list to achieve O(1) get and put operations, and explain the eviction policy.