Start with contracts, not code. Full-stack developers are integration architects. Your real job is to define boundaries, not jump into implementation. Model the API first: OpenAPI, GraphQL schema, TypeScript types. Make sure it reflects real business flows, not assumptions. Once both sides agree on the contract, everything becomes predictable, testable, and way less political. Always look at the big picture. Great full-stack devs look at a problem from both ends of the stack. You know where complexity should live, where a change belongs, and where bottlenecks actually come from. ...