The outbound partner behind a go-to-market consultancy

Advantive had just won a couple of clients and did not have the hands to service them. Shirin came to closed:in through mutual friends and a glowing reference. The bar was set by her own background: years in financial services and dozens of vendors, so she knows what good looks like.

The ask was not a generic campaign. Advantive owns strategy, messaging and the sending infrastructure, and its clients expect the consultancy's standard. closed:in had to build and run inside that setup, to that standard, and keep it running week after week.

closed:in builds the lists, enriches and verifies them in its own Clay workspace, and sets up and runs the campaigns in Advantive's infrastructure: Instantly for email, HeyReach for LinkedIn, around twenty domains and a hundred inboxes. Shirin signs off on every list and every line of copy before a launch.

The rhythm is a weekly meeting and two-week campaign cycles: run, read, iterate on the data or the messaging. The target definition is by function and seniority band rather than job title, with cohorts kept apart so each one can be judged on its own. One lead source play scrapes the followers of relevant accounts and qualifies them in Clay.

Advantive could take on the clients it had won. What Shirin calls out is not the methodology but how the work ran: the professionalism from the first week, how problems were solved, and how engagements were closed. Her second point is speed: there is always something that goes wrong, and what matters is how fast it is fixed. She remembers Jurre taking his laptop on holiday to look after a live campaign.

The partnership started in June 2026 and continues. Shirin recommends closed:in to anyone who needs lead generation.