Is Amazon's COE Process Really Effective? Insights from SDEs

Today I talked with a friend about Amazon's Correction of Errors (COE) process, which engineers write after a customer‑impacting bug to detail the cause and preventive actions.

In short, COE is a thorough document that explains why an incident happened and how to avoid it in the future, but opinions differ on whether it positively drives organizational improvement or fosters blame‑shifting and bureaucratic culture.

In Chinese companies, many engineers view COE as a "blame‑shifting meeting"; some see it as valuable for personal growth, while others consider it a pointless bureaucratic step compared to regular Sev‑2 handling.

The author collected several SDE/SWE responses:

Reply 1 (support): Properly written COE prevents recurrence even if the original engineers leave; it focuses on root‑cause analysis and prevention.

Reply 2 (support): COE is useful; respecting its process is important, and it helps turn failure into valuable lessons.

Reply 3 (support, workload): Amazon's action‑item mechanism enforces deadlines and accountability, helping prioritize technical debt.

Reply 4 (support, blame tool): COE can be misused to shift responsibility to other teams.

Reply 5 (support): COE is part of engineering and product improvement.

Reply 6 (support, with reservations): Similar processes may be sufficient; the formal COE workflow can be excessive.

Reply 7 (support): Though labor‑intensive, COE saves extra work by feeding back into design and architecture.

Reply 8 (support): In retail, COE feels like a semester paper—time‑consuming but valuable.

Reply 9 (support): Tracking action items and deadlines is the most important part of COE.

Reply 10 (support, with reservations): When used correctly COE is useful, but many would avoid filling it out.

The core issue is not the documentation itself but broken feedback loops; the data collected must be effectively utilized.

In conclusion, while COE can be painful and bureaucratic, when properly executed it helps prevent repeat incidents, aligns stakeholders, and improves engineering culture.