Your resume probably lists systems you built. An architect's resume lists calls you made. We pick three: a datastore choice, an integration pattern, a build-versus-buy. For each we capture the constraint, the option you rejected, the cost implication, and what you would revisit now. That last part is what senior panels listen for.
Developers optimise for correctness and delivery. Architects are hired for availability targets, latency budgets, security posture, data residency and total cost. These are the constraints that decide designs in real organisations. We work through them against systems you have shipped, so you can quantify rather than gesture at them in a review.
The same architecture has to survive a principal engineer picking at failure modes and a delivery head asking why it costs more than last year. Most developers can do the first and stumble on the second. We rehearse both versions of each design until the business framing is as rehearsed as the technical one.
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For consulting and services organisations it frequently gates the shortlist, so it is worth having. For product companies it carries much less weight than a design you can defend under questioning. The mistake is treating the certification as preparation for the interview. It teaches service catalogues, while the panel is testing judgement about trade-offs the exam never asks you to make.
A system design round usually stays technical and abstract. An architect loop adds constraints you cannot design away: an existing estate, a budget, a compliance requirement, a team that cannot be retrained this year. Expect to be pushed on migration sequencing and on what happens if half the plan is funded. Answers that assume a clean slate read as inexperience.
It is a fork, not an end. The role moves you toward influence over many systems and away from daily implementation, and some engineers find that trade unwelcome after a year. It is worth being honest with yourself about whether you want to keep writing code. If you do, principal or staff engineer tracks retain more hands-on work at a comparable level in most product companies.
That is the common case, and it is a documentation problem rather than an experience problem. Design reviews you led, choices you argued for, and the migration you sequenced all count even if your title said senior developer. We reconstruct that history into artefacts you can talk through, then get your reporting manager or tech lead aligned so a reference conversation confirms the same story.
