Cisco Senior Software Engineer Interview Questions

1.Give me an example of when you noticed your team's culture wasn't working well and you took action to improve it. What specifically did you do?

2.Tell me about a time when you had to advocate for investing engineering time in something that wouldn't show immediate customer-facing results but was critical for long-term customer success.

3.Tell me about a time you had to get two teams that normally don't work together to solve a problem that neither could handle alone. What was the technical challenge and how did you bridge the gap?

4.Walk me through a time when you had to integrate systems or data from completely different parts of the organization to deliver a solution. What made it challenging?

5.Describe a situation where you had to choose between hitting a quarterly target and doing what was right for a customer's long-term success. What did you decide and why?

6.Tell me about a time you proposed a technical approach that would disrupt or replace something your team was already heavily invested in. How did you make the case?

7.We're seeing packet loss spikes on our Meraki cloud dashboard when handling network telemetry from thousands of devices. How would you debug this issue when the data flows through Kafka to TimescaleDB?

8.Write a function in Python that efficiently processes network device configurations to detect security policy violations across thousands of Cisco IOS devices.

9.You need to implement Zero Trust network access for a new microservice in our Kubernetes cluster. Walk me through your security design and the specific controls you'd put in place.

10.Our AppDynamics monitoring shows a gradual memory leak in a Java service that processes network topology data. How would you investigate and fix this issue?

11.Design the backend architecture for a Webex feature that needs to handle 100,000 concurrent video calls with real-time quality metrics. What are your key design decisions?

12.Design a REST API for Cisco Security that aggregates threat intelligence from multiple security products and provides unified risk scoring. What are your key architectural decisions?

13.Design a data pipeline for AppDynamics that aggregates performance metrics from thousands of customer applications and provides real-time business impact scoring. How do you handle the data volume and ensure customer data isolation?

14.Design a centralized logging system for all Cisco cloud services that can ingest 50TB of logs per day and provide sub-second search across security, performance, and audit logs. What are your main design considerations?

15.Design the storage and retrieval system for Webex's chat history feature that needs to support 200 million daily active users with instant search across years of message history. What are your key architectural decisions?

16.Design a licensing and entitlement system for Cisco Security products that needs to handle real-time feature activation across different deployment models - on-premises, cloud, and hybrid environments. What challenges do you anticipate?

17.Design a real-time network monitoring system for Cisco Meraki that can detect and alert on anomalies across 500,000 devices within 30 seconds of an incident. How do you handle the data ingestion and processing at this scale?

18.We need to build a configuration management system for Cisco's network operating systems that can safely deploy updates to 100,000+ devices without causing network outages. How do you design the rollout and rollback mechanisms?

19.Tell me about a time when you had to convince a more senior engineer or architect to adopt a security-first approach they were initially resistant to. How did you influence their decision?

20.Describe a time you had to lead a cross-functional initiative where engineering, product, and customer success teams had conflicting priorities. How did you align them around a solution?

21.Walk me through a time when you championed an innovative technical approach that required your team to learn completely new technologies or methodologies. How did you drive adoption?

22.Tell me about a time when you inherited a technically complex system or codebase that had accumulated significant technical debt. How did you lead your team through modernizing it while maintaining customer reliability?

23.Give me an example of when you had to build credibility and influence with a team that had deep domain expertise in an area you were less familiar with. How did you earn their respect and lead effectively?

24.Describe a situation where you had to lead your team through a significant failure or outage that impacted customers. How did you handle both the immediate response and the longer-term team learning?

25.Cisco Webex currently handles about 25 billion meeting minutes per month. If we wanted to add real-time sentiment analysis to all meetings, estimate the compute and storage costs. Walk me through your assumptions.

26.Estimate how many network configuration changes happen across all Cisco enterprise customers in a typical day. What data would you need to validate your estimate?

27.Our Meraki dashboard shows network performance metrics dropping by 8% across enterprise customers this week, but no code was deployed and there were no reported outages. How would you investigate this?

28.AppDynamics customers are reporting that their application performance scores are inconsistent between our dashboard and their internal monitoring tools. You have 48 hours to deliver an analysis to the customer success team. How do you approach this?

29.Cisco Security products generate threat intelligence data that needs to be shared between on-premises firewalls, cloud security services, and partner organizations. Design a framework to measure the business value of this data sharing. What metrics would you track?

30.Cisco operates in 165 countries with different data sovereignty requirements. If we wanted to estimate the engineering effort required to implement country-specific data residency for our cloud products, how would you structure this analysis?