Goldman Sachs Staff Software Engineer Interview Questions

1.Tell me about someone you've mentored through a difficult technical challenge. What was the challenge, how did you structure your coaching, and what was the outcome?

2.Tell me about a time you pushed back on a technical approach your team wanted to take. What was the situation, how did you handle the disagreement, and how did it turn out?

3.Tell me about a time you had to coordinate with multiple engineering teams to deliver a critical system upgrade. What was your approach to alignment, and how did you handle conflicting priorities?

4.Describe a project where you had to get buy-in from teams outside engineering to make a technical change work. Who did you need to convince, and what was your approach?

5.Describe a significant technical decision you made that turned out to be wrong. How did you recognize the mistake, and what did you build into your next major decision to avoid repeating it?

6.Walk me through a time you had to deliver news about a technical setback or system issue to an important client or business stakeholder. How did you frame the message, and what was their response?

7.Marcus by Goldman Sachs needs to comply with banking regulations that require us to archive all customer communications for 7 years. Given our scale of millions of users, what's your storage and retrieval strategy?

8.You're building a new microservice for our internal PaaS platform. How do you design the service discovery and health checking to ensure other teams can depend on your service reliably?

9.Our Marquee platform serves analytics to thousands of institutional clients, and we're seeing memory pressure on the application servers during market open when everyone's pulling the same data. How would you redesign the caching layer?

10.You need to implement a circuit breaker pattern for our trade execution service that handles orders worth billions daily. What factors do you consider, and how do you ensure we fail safely without losing client orders?

11.You're designing a real-time risk calculation engine that needs to process 500,000 position updates per second across all our trading desks. What's your approach to ensuring we can scale this while maintaining sub-5ms latency for critical risk alerts?

12.Walk me through how you'd implement a deadlock detection algorithm for our trade settlement system that processes thousands of cross-currency transactions simultaneously.

13.Design a notification service for Marcus that needs to send account alerts, promotional offers, and regulatory notices to 8 million customers across email, SMS, and push notifications while respecting compliance requirements.

14.Our GS Risk Systems need to calculate portfolio-level VaR across all trading desks in real-time, processing position updates from 200+ trading systems. How do you design this to handle market volatility spikes that can 10x the normal update volume?

15.We want to build a unified developer portal for our GS Engineering Platform that serves 15,000 engineers across all our divisions. How do you design the authentication and authorization system to handle both internal tools and third-party integrations?

16.Design a configuration management system for Marquee that can push feature toggles and parameter updates to thousands of client-facing services without causing any user-visible downtime.

17.You're tasked with designing the settlement matching system for our Transaction Banking platform that needs to reconcile millions of cross-border payments daily. How would you architect this to handle peak loads while ensuring we never miss a regulatory deadline?

18.You need to build a data pipeline that ingests real-time market data from 50+ exchanges and makes it available to our quantitative researchers within 100 milliseconds. Walk me through your architecture.

19.Tell me about a time you had to make a technical decision that would impact multiple trading desks or business units. How did you ensure your choice served the firm's collective good rather than just your immediate team?

20.Describe a time when you had to raise technical standards on your team while still hitting aggressive delivery timelines. What specific changes did you implement, and how did you get your team on board?

21.Tell me about a time you had to influence a senior partner or managing director on a technical approach they disagreed with. What was your strategy, and how did you build credibility with them?

22.Describe a time when one of your engineering decisions contributed to a client-facing issue or outage. How did you handle the immediate response, and what changes did you make to prevent similar issues?

23.Walk me through how you built and scaled an engineering team from 3 people to 15 people. What were the biggest challenges in maintaining code quality and team culture during that growth?

24.Tell me about a time you had to kill or significantly change a technical project that multiple teams were depending on. How did you communicate the decision and manage the organizational impact?

25.Estimate how many concurrent API calls our Marquee platform receives during market hours on a typical trading day. Walk me through your calculation step by step.

26.Our GS Engineering Platform serves 15,000 internal developers but adoption of our new CI/CD tooling is only 30%. How would you diagnose why adoption is low and increase it to 80%?

27.Our Transaction Banking platform processed $2 trillion in payments last year. If we reduce settlement time from T+2 to T+1, estimate the additional working capital this frees up for our corporate clients.

28.Marcus by Goldman Sachs wants to expand internationally but different countries have varying data residency requirements. Estimate the infrastructure costs for supporting 10 new markets with local data storage.

29.A quantitative researcher claims their new algorithm can improve our equity trading returns by 15 basis points, but it requires 50x more compute resources. How do you evaluate whether this is worth implementing?

30.Goldman Sachs is considering building our own payment rail to compete with Visa and Mastercard for corporate transactions. Walk me through whether this makes strategic sense and what the technical challenges would be.