Hiring in-house delivers the most control. The people learn your customers and your data model over time, and this context stays in the building. The catch is slow hiring and fixed price contract software development overhead: recruiting a strong engineer takes months, ramping up adds more time, and the payroll keeps running regardless of workload.
Full outsourcing implies the vendor owns delivery: they staff the project, they manage the process, and the provider carries the staffing risk. This works well when the outcome can be described and your side has an available product owner. It works badly when there is no one to answer questions, as an external team is not able to guess what the business wants.
Hiring individual contractors is the middle option: you bring in hire offshore angular developers and keep responsibility for delivery on your side. The main advantage is speed — a suitable engineer can start in weeks rather than months — and it winds down as quickly as it ramped up. The condition is that your technical leaders have to have the bandwidth to manage them. Without strong internal leadership, the result is paying for effort with no owner.
Most of the time, these models are combined. A frequent arrangement keeps the architecture and the core domain with permanent staff, while a partner takes on peaks, well-defined modules or next js vs laravel performance platform work. The line is simple enough: retain the parts that are hard to re-learn, and outsource what is well understood.
A few questions usually settle it. Start here: is this software central to how you make money, or hire redis programmer a cost centre? Then: over what horizon will the work last — months or years? Finally: who owns it once the vendor leaves? Answer these three honestly and the model usually chooses itself.