Describe contributions to production code

The interviewer is trying to understand whether you’ve worked on **real systems used by real users**, and how you handle the responsibilities that come with that. ### If you **have** contributed to production code 1. **Confirm and give context** - State clearly that you have, and briefly describe the product or system. 2. **Describe scope and ownership** - Features or components you owned or significantly contributed to. - Types of changes: new features, bug fixes, performance improvements, infra changes. 3. **Highlight production-focused practices** - Testing (unit/integration/e2e). - Code reviews. - Deployment process (CI/CD, canary, feature flags). - Monitoring and on-call/incident experience, if any. 4. **Mention impact and reliability** - Effects on users or business metrics. - How you ensured safety and minimized risk. **Example outline:** > "Yes. At my current job I regularly ship code to production for our customer-facing web application. For example, I implemented the new billing summary page, including the backend API and database changes. I wrote unit and integration tests, went through peer code reviews, and used our CI/CD pipeline to deploy behind a feature flag. After rollout, I monitored logs and metrics to ensure error rates stayed low. This experience taught me to think carefully about backward compatibility and rollback strategies." ### If you are **early in your career** or experience is limited You can still give a good answer by: 1. **Being honest about scope** - Don’t overstate. Clarify if your work was under close supervision or on smaller parts. 2. **Highlight any real deployments** - Even if small: internal tools, student projects deployed for real users, open-source contributions that are used in production by others. 3. **Emphasize good habits** - How you wrote tests, used version control, and performed reviews. - Any experience debugging issues in deployed environments. 4. **Show readiness to handle more responsibility** - Mention what you learned and your eagerness to take on more production work. **Example outline:** > "I’ve had some limited but real exposure to production code. During my internship, I implemented and shipped a small but user-facing change to our settings page, under the guidance of a senior engineer. I wrote tests, addressed feedback in code review, and helped verify the change after deployment. In my personal time, I maintain a small web app that’s deployed and used by a student organization. While my production experience is still early-stage, I’ve learned the importance of testing, observability, and incremental rollouts, and I’m looking forward to taking on larger responsibilities."