You usually call me in one of three situations.
Security and auditing
There's an audit or a launch coming, and you need to know what's actually wrong before someone less friendly finds it. I go in, test it properly, and tell you the truth, no sugar-coating: what's broken, how bad it is, and what to fix first. CEH-certified, 60+ pentests behind me.
Advisory and rescue
Your contractor went quiet, or walked, and something half-built still has to ship with nobody left who understands it. I take it over, work out what's really going on, and pull it forward. Same deal if you just want a senior pair of hands to lead the thing and own the outcome.
End-to-end engineering
You roughly know what you want and need one person who can sit with you, turn it into real requirements, then actually build it. Mobile, web, backend, and the infrastructure under it, shipped to production and kept running, all from the same pair of hands.
However it starts, you get one accountable expert who leads and ships, solo or inside your team. B2B and invoiced. Remote across the EU, and further when it's worth the trip.