Workday Senior Software Engineer Interview Questions

1.Walk me through a project where you had to coordinate with product, design, and other engineering teams. How did you keep everyone aligned?

2.Give me an example of when you had to refactor a poorly designed class hierarchy. What made it problematic and how did you fix it?

3.Tell me about a time you had to model a complex business domain using object-oriented design. What were the core entities and relationships you identified?

4.Describe a situation where customer feedback completely changed your approach to a feature you were building. How did you pivot?

5.Describe a time when you had to ensure a critical service stayed reliable under high load. What specific measures did you implement?

6.Tell me about a time you identified and addressed a bias in your team's hiring or design process. What action did you take?

7.Walk me through how you'd implement a new REST API endpoint in Workday Extend that allows customers to query employee data. What considerations are specific to our platform?

8.You need to write a function that validates Workday object relationships - for example, ensuring that an employee can only be assigned to positions within their legal entity. How would you implement this validation efficiently?

9.You're working on Workday's payroll service and need to ensure that salary calculations are isolated between different customer tenants. How would you design the data model and service architecture to guarantee no tenant can access another's data?

10.Imagine you're debugging a performance issue where Workday's financial close process is taking 6 hours instead of the usual 2 hours for a large enterprise customer. How would you investigate and resolve this?

11.You're tasked with integrating Workday Illuminate AI into the HCM recruiting workflow to suggest candidate matches. The ML model needs to process resume data in real-time while maintaining sub-second response times. How would you architect this system?

12.A product manager wants to add a new field to track employee wellness scores across all Workday HCM customers. This field will be used in analytics and reporting. What technical and process considerations would you raise?

13.Walk me through how you'd build a notification system for Workday HCM that can handle time-sensitive alerts like payroll deadlines across different time zones. The system serves 11,000+ enterprise customers with varying notification preferences.

14.You need to design a search service for Workday Extend that allows customers to build custom search experiences across their HR and financial data. How would you handle the security and performance requirements when customers have millions of employee and transaction records?

15.You're designing a new feature in Workday Adaptive Planning where customers can create custom financial models that need to handle real-time collaboration between 50+ users. How would you architect this to maintain data consistency while supporting concurrent edits?

16.Design the caching layer for Workday's object-oriented data model that serves both HCM and Financial Management queries. The cache needs to handle complex object relationships and ensure updates to one tenant don't affect another tenant's performance.

17.Design a data migration system that can move hundreds of enterprise customers from legacy HR systems into Workday HCM while ensuring zero downtime and no data corruption. How would you handle the fact that each customer has slightly different data schemas?

18.Design a feature flag system for Workday's platform that can safely control feature rollouts across thousands of enterprise customers while respecting their individual deployment schedules and compliance requirements.

19.Tell me about a time you had to convince a senior engineer or architect to change their technical approach on a project. How did you build that influence?

20.Describe a time you had to make a technical decision that would impact multiple engineering teams. How did you navigate getting alignment across those teams?

21.Tell me about a time you had to help a struggling engineer on your team improve their performance. What approach did you take?

22.Describe a situation where you identified that your team's approach wasn't inclusive or was creating barriers for certain team members. How did you address it?

23.Tell me about a time you had to advocate for a long-term technical investment that wouldn't show immediate business value. How did you build support for it?

24.Describe a time when you had to lead a team through a significant technical or organizational change that people were initially resistant to. How did you manage that transition?

25.Estimate how many employee record updates Workday processes in a typical day across all our customers. Walk me through your reasoning and assumptions.

26.You notice that adoption of a new Workday HCM feature is much lower in certain regions compared to others, despite similar customer profiles. How would you investigate what's causing this disparity?

27.Our Workday Adaptive Planning customers are reporting that scenario modeling is timing out for large datasets. How would you investigate this performance issue and what metrics would you look at first?

28.A new regulation requires all EU customers to have their payroll data processed within specific geographic boundaries. Estimate the engineering effort to implement this for Workday's platform.

29.Workday's Illuminate AI features are seeing 40% higher usage than projected, causing increased infrastructure costs. How would you analyze whether we should scale up infrastructure or optimize the AI models, and what factors would drive that decision?

30.A Fortune 500 customer wants to integrate their custom learning management system with Workday HCM, but their API has significantly different data models than ours. Estimate the complexity and timeline for building this integration.