The standard approach
Most software outsourcing firms sell you a project. Their process, their tools, their team, decided before they ever understood your business. The work gets done somewhere next to your company, not inside it. A few months in you are managing a second organisation. Status meetings to translate between their world and yours. Handovers that lose something every time. Coordination overhead that grows quietly until it costs more than the work itself. And when the project ends, everything they learned about your business walks out with them.