LinkedIn Staff Software Engineer Interview Questions

1.Describe a situation where you needed to work with a difficult stakeholder or team member to deliver a critical project. How did you build that relationship?

2.Tell me about a time you took ownership of a significant problem that wasn't directly your responsibility. Why did you step in, and how did you drive it to resolution?

3.Tell me about a time you pushed back on a product requirement or feature request because you felt it wasn't in the best interest of users. What was the feature and how did you handle the pushback?

4.Walk me through a time you raised the engineering bar on your team - either through code quality, testing practices, or technical standards. What resistance did you face and how did you drive adoption?

5.Tell me about a time you had to give difficult feedback to a peer or receive hard feedback that changed how you approach your work. What was the feedback and what happened next?

6.Describe a calculated technical or product risk you took that didn't pan out. What was your reasoning going in, and what did you learn from the outcome?

7.A product manager wants to add a feature where users can see real-time typing indicators when someone is messaging them. How would you implement this using LinkedIn's existing infrastructure?

8.You're leading the migration of a critical LinkedIn Learning service from a monolithic Java application to microservices. How do you ensure zero downtime for learners while maintaining data consistency?

9.Our LinkedIn Jobs recommendation service is experiencing inconsistent latency - some requests take 50ms, others take 2 seconds. The 95th percentile is fine, but the 99th percentile is unacceptable. How would you debug this?

10.You need to implement a rate limiting system for LinkedIn's public API that handles both member authentication and partner integrations. What's your approach?

11.You're building a new feature for LinkedIn Feed that requires real-time updates across millions of user connections. Walk me through your architecture design, considering our Kafka infrastructure and microservices patterns.

12.Write a function that finds the top K most connected professionals within N degrees of separation from a given LinkedIn member. Consider the efficiency at LinkedIn's scale.

13.Design the event streaming infrastructure to power LinkedIn's 'Who Viewed Your Profile' feature for our 950 million members. How would you handle a viral post author getting millions of profile views in an hour?

14.You're designing LinkedIn Learning's course completion tracking system that needs to sync progress across mobile apps, web, and offline downloads. How do you ensure learners never lose progress when switching devices?

15.Design the backend system for Sales Navigator's account targeting feature that lets sales professionals find companies based on complex criteria like growth stage, employee count changes, and recent funding. How do you keep this data fresh across 67 million companies?

16.LinkedIn Recruiter customers often search for candidates with very specific skill combinations that only match 50-100 people globally. Design a search system that can handle these rare, precise queries while still delivering results in under 200ms for our 30,000+ recruiter users.

17.Design LinkedIn's connection recommendation system ('People You May Know') to serve 950 million members while preventing the system from recommending people that members explicitly don't want to connect with. How do you handle negative signals at this scale?

18.Design the notification delivery system for LinkedIn Feed that needs to notify members about new posts from their network, but a single viral post from someone with millions of followers could trigger 50+ million notifications. How do you prevent this from overwhelming our infrastructure?

19.Tell me about a time when you had to convince an engineering team to adopt a new technology or practice, but you weren't their manager. How did you build the case and drive adoption?

20.Tell me about a time when you had to step into a leadership role during a production incident or crisis that affected LinkedIn members. What was your approach to both resolving the issue and leading the team through it?

21.Describe a situation where you had to make a technical decision that would impact multiple LinkedIn teams, but those teams had conflicting priorities. How did you navigate that?

22.Walk me through a time when you identified that your team's engineering practices weren't meeting LinkedIn's standards for a service at our scale. How did you drive the necessary changes?

23.Tell me about a time when you had to lead a project involving both LinkedIn engineers and our AI/ML infrastructure, but you weren't familiar with the ML components. How did you ensure project success?

24.Describe a situation where you had to make a decision that would improve member experience but required significant engineering investment from multiple teams. How did you build the coalition to make it happen?

25.Estimate how many profile views LinkedIn generates per day, and walk me through how you'd design the infrastructure to track and store that data cost-effectively.

26.LinkedIn Learning completion rates dropped 3% last month with no product changes. How would you investigate this, and what metrics would you look at first?

27.Estimate the revenue impact if LinkedIn's messaging response time increased by 20%. What assumptions would you make and how would you model this?

28.Sales Navigator's advanced search is timing out for 2% of queries involving complex company filters. These are typically our highest-value customers. How would you approach this problem?

29.LinkedIn Jobs recommendations serve 50 million job seekers daily. If we wanted to add a feature showing salary expectations for each recommended job, estimate the computational and storage costs, and how you'd implement this efficiently.

30.Estimate how much revenue LinkedIn loses annually from connection request spam, considering both direct impacts and member trust degradation. How would you validate this estimate?