We've been doing this since 2013. We work as an embedded technical lead within your team — not as an outsider shipping code, but as someone who sits with your developers and stakeholders to understand the real problem.
Then we design and implement the most appropriate solution. No unnecessary complexity. No architecture astronautics. Just the right approach for the problem at hand.
The approach is personal. We've led teams of 3 and teams of 30. We've worked with event sourcing, identity platforms, real-time messaging, and large-scale eCommerce. Every engagement is different, and that's the point.