Design reviews happen before code is written, which is exactly why they matter so much. A good design review surfaces assumptions, identifies risks, and aligns the team on an approach before anyone invests weeks or months of engineering effort. A poor design review becomes a slow rubber stamp, or worse, a meeting where the strongest opinion wins and the work begins with false confidence. As the engineering manager, your role is not to be the most technical person in the room. It is to create the conditions for clear thinking, honest scrutiny, and decisions that actually stick.
Design reviews are not about catching mistakes. They are about surfacing risks and aligning on approach before the work begins in earnest.
What a design review is actually for
A design review is a structured conversation about an engineering approach before implementation begins. The goal is not to produce a perfect document or to audit the author. It is to give a proposal the scrutiny it needs so the team can proceed with shared understanding and reduced risk. Done well, design reviews catch architectural problems early when they are cheap to fix, surface alternatives the original author had not considered, and create a written record of why a particular approach was chosen.
Not every piece of work needs a formal review. The threshold should be proportional to the complexity, reversibility, and blast radius of the decision. A small bug fix or isolated feature change probably does not need one. A new service, a data model change, or anything that crosses team boundaries almost certainly does. As the manager, you can help your team develop good judgement about when to invest in a review rather than prescribing it for everything.
- Catch risks earlyProblems identified in a document cost minutes to fix. Problems identified after six weeks of implementation cost weeks to unwind. The primary value of a design review is compressing that feedback loop before the work begins.
- Build shared understandingA design review forces the author to explain their thinking clearly enough for others to critique it. That process alone often surfaces gaps. And the team that reviews the design understands the implementation far better than they would from reading a pull request later.
- Create a decision recordOne of the most valuable outputs of a design review is a written record of what was decided and why. Six months later, when someone asks why the system works this way, that document is the answer. Without it, the reasoning is lost and decisions get relitigated.
- Align across teamsDesigns that touch shared infrastructure, APIs, or data models often need sign-off from other teams. A structured review provides a clear moment for that alignment rather than discovering the conflict mid-implementation.
Who should attend and who should not
The biggest mistake in design reviews is inviting too many people. A room of twelve engineers produces a meeting full of competing opinions, unclear decisions, and an author who leaves feeling cross-examined rather than supported. The people in the room should be the people whose input will materially improve the design or who need to approve it to proceed. Everyone else should receive a summary after the fact.
Invite
Do not invite
Your role as manager is to keep the meeting focused and to make or escalate any decisions that fall outside the team's authority. If a design touches another team, their engineering manager or tech lead should attend, not the entire team. When in doubt, a smaller room is better. You can always share the document more widely for asynchronous comment before the session.
What a good design document includes
A design document does not need to be long. It needs to be clear. The most useful design documents are short enough that reviewers actually read them and specific enough that reviewers can give useful feedback. An overly detailed document often obscures the key decisions behind noise. A vague one gives reviewers nothing to push back on. The author should aim for the minimum viable document that communicates the proposal honestly, including its uncertainties.
Design document checklist
The "alternatives considered" section is the one most authors skip and the one that provides the most value to reviewers. It shows that the author thought broadly before committing to an approach. When it is absent, reviewers spend the first half of the meeting suggesting alternatives the author already ruled out, which wastes everyone's time and can feel dismissive to the author.
How to structure the review session
The design review meeting is where the real work happens, and the structure of it matters. The most common failure is spending thirty minutes recapping the document for people who did not read it. Make it a firm expectation that everyone reads the document before they arrive. If people consistently show up unprepared, consider moving to an async-first process where comments are submitted before any meeting takes place.
- Set expectationsSend the document at least twenty-four hours before the meeting. Make clear that the session assumes everyone has read it. A five-minute summary at the start is acceptable; a full walkthrough of a document everyone should have read is not.
- Open with questions, not opinionsStart by asking reviewers to share their questions rather than their verdicts. Questions are more useful than statements in the early part of a review. They open up the thinking rather than closing it down. Opinions and recommendations come after the questions have been explored.
- Separate clarification from critiqueThe first part of the session should be clarifying questions, not challenges. Understanding what the author intended before evaluating it prevents time being wasted arguing past each other. Distinguish between "I do not understand this" and "I disagree with this approach" - they require different responses.
- Make the decision explicitEvery design review should end with a clear outcome: approved, approved with conditions, or not yet ready to proceed. A session that ends ambiguously forces the author to guess whether they can move forward. As the manager, your job is to ensure the meeting ends with a clear answer.
- Capture actions immediatelyIf the design is approved with conditions, the conditions need to be captured as specific actions with owners and timelines before the meeting ends. Vague conditions like "address the scalability concern" become blockers that nobody follows up on.
How to give feedback without dominating
As the manager, your feedback carries disproportionate weight in the room. A concern you mention casually can feel like a blocker to the author. A suggestion you make can be interpreted as a requirement. That does not mean staying silent - your perspective is valuable - but it does mean being deliberate about how and when you contribute. Lead with questions rather than statements, and hold your views until the team has had a chance to share theirs. You will learn more and the session will produce better thinking.
- Ask before you assertInstead of "I think we should use X," try "Have you considered X? What were your thoughts on it?" This keeps the author's thinking in the foreground and makes it easier to course-correct if you have misunderstood something.
- Be specific about concernsVague concerns like "I am worried about scale" are hard to act on. Specific concerns like "at our current growth rate, this approach would hit a database row limit in about eighteen months - can we plan for that now?" give the author something concrete to address.
- Distinguish must-fix from nice-to-haveEvery piece of feedback should be flagged as a blocker, a recommendation, or an observation. If everything feels equally weighted, the author cannot prioritise. A clear hierarchy of feedback is one of the most useful things a manager can model in a design review.
- Support the author after the sessionDesign reviews can feel exposing, especially for engineers who are newer to the process. A brief check-in after the session to acknowledge the work they put in, clarify any ambiguous feedback, and confirm what is expected next costs almost nothing and matters a great deal.
Common failure modes to avoid
Even well-intentioned design review processes can drift into patterns that undermine their purpose. The most common failure is reviews becoming a formality - the document gets written, the meeting happens, and the outcome is always approval regardless of the quality of the thinking. When that happens, the process stops adding value and starts adding friction. The second most common failure is the opposite: reviews become so thorough and demanding that engineers avoid them, and significant work gets done without any structured scrutiny at all.
- Rubber stampingIf your design reviews always end in approval within twenty minutes, they are not doing their job. Scrutiny should feel meaningful. When a design is genuinely good, approval should feel earned, not automatic. If approvals are always easy, the bar is probably too low.
- Endless iterationThe opposite failure is reviews that never conclude. The author keeps revising, reviewers keep finding more concerns, and implementation is indefinitely delayed. Set a clear expectation that a design should proceed once the major risks are addressed, not once every concern has been perfected.
- Design-by-committeeWhen too many people have veto power, designs converge on the least controversial option rather than the best one. Make it clear who the final decision-maker is for each review. This is usually the author in consultation with a senior engineer, with you as the manager resolving any genuine deadlocks.
- Reviewing too lateA design review that happens after significant implementation work is already complete is more a validation exercise than a genuine review. Establish a team norm that designs are reviewed before substantial coding begins. The earlier the review, the lower the cost of changing course.
Frequently asked questions
Capture decisions and actions from every review
Keep design decisions connected to the work they inform. Log actions, track follow-through, and never lose the context behind a technical choice.