Both in-house developers and external software teams can be useful. External teams are a great option when you want to quickly scale your headcount, start new and one-off projects, or keep your in-house team focused on other business areas.
External teams are also effective for eliminating high-cost salaries, or expenses related to hiring, recruiting, and training talent. They help provide flexibility as new teams can be spun up quickly, giving you the ability to scale your headcount seamlessly according to workload.