How would you fix a long, unmanageable product backlog?

WHAT THIS TESTS: This question probes your senior-level ability to diagnose and solve a systemic process failure, not just apply textbook Scrum rules. A 200+ item backlog indicates a lack of a clear Product Goal and a broken backlog refinement process. The interviewer is looking for leadership and influence to fix the root cause, restoring the Scrum pillar of Transparency, rather than just treating the symptom of a long list.

A GOOD ANSWER COVERS: A strong answer outlines a clear, collaborative strategy. First, propose a dedicated, time-boxed workshop (e.g., a 2-4 hour meeting) with the Product Owner and the Developers. The goal is not to groom 200 items, but to reset the process. Second, the first action in the workshop is to collaborate on and commit to a single, clear Product Goal. This is the essential filter. Third, with the Product Goal defined, ruthlessly triage the entire backlog. Items are either aligned and stay, or they are not and get archived. Be bold; suggest that 80-90% of the backlog might be archived. Fourth, establish a new, sustainable process for backlog refinement, ensuring it's an ongoing activity, not a last-minute meeting before Sprint Planning.

COMMON WRONG ANSWERS: A major red flag is blaming the Product Owner. While the PO is accountable, a senior engineer should act as a partner to solve the problem, not assign blame. Another weak answer is suggesting a simple "grooming session" to estimate all 200 items. This is tactical, not strategic; it doesn't solve the root cause and just creates more waste. Suggesting complex prioritization frameworks like RICE or MoSCoW before establishing a Product Goal is putting the cart before the horse. The primary filter must be the goal, not a scoring system.

LIKELY FOLLOW-UPS: "What if the Product Owner resists archiving items, saying they are all important?" (Your answer should focus on influence, linking back to the Product Goal and the cost of maintaining a large backlog). "How would you structure this workshop?" (Describe the agenda: 1. Define Product Goal, 2. Triage, 3. Define new process). "What does a 'healthy' backlog look like to you?" (DEEP: Detailed appropriately, Estimated, Emergent, Prioritized. Should have 2-3 Sprints' worth of ready work at the top).

ONE CONCRETE EXAMPLE: "I'd propose a 'Backlog Reset' workshop. We'd start by agreeing on our Product Goal for the next quarter: 'Increase user activation by 15% for new signups.' Then, we'd go through the 200 items. For each, we ask: 'Does this directly contribute to increasing new user activation?' If yes, it stays for further refinement. If no, or 'maybe someday,' it goes into an 'Archived' state in Jira. I'd expect to archive over 150 items. We'd end by agreeing to dedicate one hour every Tuesday to backlog refinement as a team, and that no new item enters the backlog without being tied to the Product Goal."