InMobi India Solution Architect Interview: Rounds, Questions and Preparation

What the job involves

A Solution Architect in telecom and internet designs end-to-end technical solutions that meet client or product requirements, balancing scalability, cost, and performance. Day to day, they work with engineering, product, and sales teams to translate business needs into architecture diagrams, integration plans, and deployment strategies. At companies like InMobi India, this often involves mobile advertising, real-time bidding, and large-scale data pipelines.

Role and Technical Knowledge

1. 1

   What is the difference between 4G and 5G core network architecture, and how does it impact solution design for a mobile advertising platform?

   Cover key differences like service-based architecture, network slicing, and lower latency. Explain how 5G enables real-time ad delivery and edge computing for better user targeting.

2. 2

   How would you design a REST API for a telecom operator to expose subscriber data to third-party advertisers securely?

   Mention OAuth 2.0 for authentication, rate limiting, data anonymization, and compliance with TRAI regulations. Discuss versioning and error handling.

3. 3

   Explain how a content delivery network (CDN) works and why it is critical for an internet company like InMobi that serves ads globally.

   Describe edge caching, latency reduction, and bandwidth optimization. Relate to ad serving by reducing load times and improving user experience across geographies.

4. 4

   What are the key considerations when migrating a legacy telecom billing system to a cloud-native microservices architecture?

   Discuss data consistency, downtime minimization, security, and cost. Highlight the need for API gateways, containerization, and gradual cutover strategies.

Practical Scenarios

1. 5

   A client wants to add real-time bidding for mobile ads but their current infrastructure cannot handle peak loads. How would you architect a solution?

   Propose a scalable event-driven architecture using Kafka for streaming, auto-scaling groups, and a NoSQL database for low-latency reads. Include load testing and fallback mechanisms.

2. 6

   You need to integrate a telecom operator's SMS gateway with a cloud-based notification service. Outline your approach.

   Cover API mapping, protocol translation (SMPP to REST), security (TLS, IP whitelisting), and error handling. Mention monitoring and retry logic.

3. 7

   A solution you designed is facing high latency in certain regions. How would you diagnose and fix it?

   Suggest using tracing tools, CDN logs, and network monitoring. Propose solutions like edge nodes, protocol optimization, or database sharding based on root cause.

4. 8

   How would you ensure high availability and disaster recovery for a real-time ad exchange platform?

   Discuss multi-region deployment, active-active or active-passive setups, data replication, and automated failover. Mention RTO and RPO targets.

Behavioural and HR

1. 9

   Tell me about a time you had to explain a complex technical concept to a non-technical stakeholder.

   Use the STAR method. Emphasize clarity, use of analogies, and checking for understanding. Highlight positive outcome like stakeholder approval.

2. 10

   Why do you want to work as a Solution Architect in the telecom and internet sector, especially at a company like InMobi?

   Show passion for solving large-scale connectivity and advertising challenges. Mention InMobi's global impact and your desire to work at the intersection of telecom and ad tech.

3. 11

   Describe a situation where you had to learn a new technology quickly to solve a problem.

   Focus on your learning process, resources used, and application. Connect it to the fast-changing telecom and internet landscape.

4. 12

   How do you handle conflicting priorities from multiple stakeholders in a project?

   Discuss prioritization frameworks (like MoSCoW), communication, and negotiation. Give an example of balancing technical feasibility with business needs.