What I learned taking Ramp Bill Pay from 0 to N
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A tech lead at Ramp shares lessons from building the Bill Pay product from scratch to a multibillion-dollar annual payment volume. The post covers two phases: 0-to-1 (choosing the right abstractions, communicating via code rather than English, shipping fast and iterating with beta customers) and 1-to-N (replacing duct-tape solutions with scalable systems, prioritizing what to fix first, adopting gradual rollouts and monitoring, and writing documentation once the team grows). Key insights include using canonicalized payment statuses to reduce complexity, using mocked functions to eliminate ambiguity in cross-team communication, and treating the first customer demo as the true halfway point rather than the finish line.
