Building your own team buys you the most control. The people learn your customers and your data model over time, and that knowledge stays inside the company. The catch shows up as time and rigidity: filling a senior role takes months, ramping up adds more time, and the payroll continues regardless of workload.
Full outsourcing implies an external team owns the outcome: they staff the dedicated development team, they manage the day-to-day work, and the provider carries the staffing risk. This works well when the work is a defined project and your side has someone who can make decisions quickly. It works badly when nobody on your side owns the product, because a vendor is not able to invent your business rules.
Staff augmentation falls in the middle: you add engineers and keep responsibility for delivery on your side. It is fast — the right specialist is often available almost immediately — software maintenance and support services the commitment ends when the work does. The catch remains that your engineering managers must have time for code review and planning. Without that, the result is paying for effort with no owner.
In the real world, hire web2py expert companies blend them. One durable pattern keeps the critical decisions and the core system with permanent staff, while an outside vendor covers the parts that are bounded and specifiable. The rule is simple enough: hold on to what defines your product, and outsource the well-trodden work.
Three questions usually settle it. To begin with: is the system a core competitive asset, livewire or vue a supporting tool? Next: how long will the work last — months or years? Finally: who owns it once the vendor leaves? Answer those honestly and the appropriate option is normally clear.