Building your own team buys you the deepest product knowledge. The developers absorb the business domain in a way no external team will match, and that knowledge remains inside the company. The catch comes in the form of a long ramp-up and fixed costs: hiring well is slow, onboarding adds more time, how to hire golang developers and the salary continues regardless of workload.
Full outsourcing is the arrangement where the vendor owns delivery: the partner staffs the roles, the partner manages the process, and they carry the staffing risk. This fits well when the work is a defined project and your side has a decision maker with time for it. It breaks down when the requirements change weekly, as a vendor will not invent your business rules.
Hiring individual contractors is the middle option: you rent capacity difference between vue and angular keep the management in-house. The main advantage is speed — the right specialist is often available in weeks rather than months — and the commitment ends when the work does. The catch remains that your own leads need the capacity to direct the work. Without that, you end up paying hourly for uncoordinated work.
Most of the time, the models mix. A common pattern holds architecture, product decisions and core domain code in-house, while an external team covers the parts that are bounded and specifiable. The line is simple enough: retain what defines your product, and outsource anything a competent team can specify and deliver.
Three questions generally decide the matter. Start here: is this software the product itself, or internal plumbing? Second: for how long will the work last — a quarter or a decade? Last: who answers the phone at two in the morning when it breaks? Work through them with real answers and the model is normally clear.