IntermediateSITUATIONAL
Product wants a new user-facing feature delivered in two weeks, but you know the backend requires foundational work such as schema changes and data migrations. How would you balance speed of delivery with long-term maintainability?
Backend Developer
General

Sample Answer

I’d start by getting very concrete about what “must be in v1” versus what’s nice-to-have. Then I map that to the backend work. For example, we had a similar case with a new subscriptions feature for ~500k users. Product wanted everything in two weeks, but the existing schema couldn’t support proration or multiple plans. We broke it into two tracks: in week one, we designed the future-proof schema and wrote backwards-compatible migrations (online, batched, with feature flags). In parallel, we built a minimal API slice that only supported the initial use case but sat on the new schema. That let us ship a constrained v1 on time while quietly migrating 100% of existing data over the next few days. I’m transparent with Product: if we cut the foundational work, we’ll move fast now but pay 3–5x later. Usually, showing that tradeoff with concrete examples gets buy-in.

Keywords

Clarify minimal viable scope with Product and separate must-haves from nice-to-havesDesign backward-compatible schema changes and online migrationsUse feature flags and phased rollout to ship value while foundations are laidExplain long-term cost of tech debt with concrete examples to gain buy-in
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