Cisco Staff Software Engineer Interview Questions

1.Walk me through a specific instance where you noticed someone on your team was struggling with inclusion or feeling left out. What actions did you take?

2.Tell me about a time you had to make a product decision that would negatively impact current user workflows to improve long-term customer experience. How did you handle the transition?

3.Tell me about the last time you had to connect two teams that weren't naturally collaborating to solve a critical customer issue. What was the blocker and how did you bridge that gap?

4.Describe the most complex integration you've led between systems that different engineering teams owned. What made it complex and how did you coordinate the solution?

5.Describe a situation where you had to choose between hitting a revenue target or maintaining a long-term customer relationship. What did you decide and how did it play out?

6.Tell me about a time you proposed a technical approach that would cannibalize an existing product or process your team owned. How did you make that case?

7.Walk me through how you'd implement graceful degradation for a Webex meeting service when the video transcoding infrastructure is under heavy load.

8.Design a Redis caching strategy for AppDynamics that needs to serve application performance metrics to thousands of concurrent dashboard users with sub-100ms response times.

9.Code a function that parses Cisco IOS configuration files and identifies potential security vulnerabilities like default passwords or open ACLs. Focus on clean, maintainable code.

10.You're building a microservice that needs to integrate with both Webex APIs for meeting data and Meraki APIs for network device status. How do you handle the different rate limiting and authentication patterns?

11.You're designing a network telemetry system that needs to process 50 million network events per second from Cisco devices across thousands of customer networks. Walk me through your architecture approach.

12.You need to migrate a legacy C++ network protocol implementation to Go while maintaining backward compatibility with existing Cisco devices. What's your migration strategy?

13.Design a centralized security policy engine that pushes firewall rules to 100,000 Meraki devices across different customer networks. Each policy change needs to reach all devices within 30 seconds while handling network partitions.

14.Design a configuration management system that can safely deploy network changes to 1 million Cisco devices while preventing outages. Changes range from single device updates to network-wide policy rollouts.

15.Webex needs to route audio/video traffic for 500,000 concurrent meetings through our global infrastructure. Design the media routing system that minimizes latency while handling data center failures.

16.Design a network device discovery service for SecureX that needs to identify and classify every device on a customer's network within 5 minutes of connection. Consider networks with 50,000+ endpoints including IoT devices.

17.AppDynamics needs to correlate application performance data with underlying network infrastructure health. Design a system that joins app metrics from 10,000 applications with network telemetry from 100,000 Cisco devices in real-time.

18.Design a zero-trust network access system that dynamically evaluates device trust and user context for every connection attempt across Cisco's global employee network of 85,000 users. Policy decisions need to happen within 50ms.

19.Tell me about a time you inherited a project where the previous technical leader had made decisions that the team disagreed with. How did you handle the transition?

20.Tell me about a time you helped someone on your team who was struggling to be heard in technical discussions. What was your approach?

21.Describe a time when you had to drive a security improvement across multiple teams who saw it as slowing them down. How did you get buy-in?

22.Walk me through a situation where you had to coordinate a critical fix across hardware and software teams with different release cycles. What was your approach?

23.Tell me about a time you had to influence a principal engineer or architect to change their technical approach when you didn't have authority over them. How did you build that influence?

24.Describe a situation where you had to advocate for engineering capacity to be allocated toward technical debt when business stakeholders wanted new features. How did you make that case?

25.Cisco spends roughly $6B annually on R&D across all products. If I asked you to estimate how much of that goes specifically to Webex development, how would you break that down?

26.A major enterprise customer reports that their Meraki dashboard is timing out when they try to view network topology for their 10,000 device deployment. Walk me through how you'd diagnose this performance issue.

27.Estimate how much network bandwidth Cisco's global workforce uses for Webex calls on a typical workday. Walk me through your assumptions about meeting patterns and video quality.

28.We're seeing 15% higher API error rates on our SecureX threat detection service during business hours across all customers. No code deployments happened this week. How would you systematically identify the root cause?

29.Cisco is considering adding AI-powered network optimization to our IOS software that would automatically adjust routing protocols based on traffic patterns. Estimate the computational cost of running this feature across our global installed base.

30.AppDynamics customers are reporting that their application monitoring dashboards become unusable during Black Friday traffic spikes, showing 30-second load times instead of the normal 2 seconds. Design an investigation plan that considers both our infrastructure and customer application behavior.