Hiring in-house gives you the most control. The engineers internalise your domain in a way no external team will match, and that knowledge stays in the building. The catch shows up as time and rigidity: hiring well routinely takes several months, getting someone productive takes several more weeks, and the cost keeps running through the quiet quarters.
Project outsourcing means the vendor owns delivery: web development company moscow the provider staffs the team, the provider manages the day-to-day work, and the provider carries the risk of missing the date. The model works when the work is a defined project and your side has a decision maker with time for it. It works badly when there is no one to answer questions, as the provider is not able to invent your business rules.
Team extension sits between the two: you bring in developers and keep responsibility seo agency for software factory delivery in-house. The main advantage is speed — a suitable engineer is often available in weeks rather than months — and the commitment ends when the work does. The condition remains that your engineering managers have to have time for code review and enterprise software development services planning. Without that, the result is paying for effort with no owner.
In the real world, these models are combined. A frequent arrangement holds the critical decisions and the core system with permanent staff, while an external team covers peaks, well-defined modules or platform work. The line holds: keep what differentiates you, and contract out the well-trodden work.
Three simple questions usually settle it. Start here: is what you are building a core competitive asset, or a cost centre? Next: how long does the work continue — months or years? Last: who answers the phone at two in the morning when it breaks? Answer these three honestly and the appropriate option usually chooses itself.