A GTM engineering agency that builds the sales system your team runs, in a HubSpot you own.
One pattern keeps repeating in the companies I talk to: sales depend on what one person knows, or on a system nobody trusts, and the next growth target stays out of reach. Selleris turns how your company actually sells into a system in your own HubSpot, so your first seller can follow it, a new sales leader can trust it, and your team can grow on it.
Sergey Danishevskiy, CEO. Every diagnostic starts with a call with me.
From our research
-
“Founders have that magic pixie dust and it's totally, totally not repeatable.”
Bob Tinker, co-founder and CEO, MobileIron
Source: A Product Market Fit Show, 2026
-
“Our Salesforce instance was, to put it mildly, a mess.”
Josh Pudnos, VP and Global Head of Revenue Operations, Exiger
-
“We want to scale a lot faster and we had a lot of problems with Salesforce and NetSuite”
Mark Douglas, CEO, LCPtracker
Source: Latka, 2023
We read 375 accounts from founders and CEOs of B2B software companies and 1,091 records on how companies build or buy their sales system, in public interviews and posts. Every quote links to its source.
Both sides of the table
I also founded Selleris Connect, a client collaboration portal. That keeps me on the buyer's side: I have to create demand for our own product, choose the stack, live with bad data and decide when to hire.
Who we are and where we work
- Selleris has delivered 400+ CRM projects since 2017, directly and through implementation partners, with a 5+ years average client relationship.
- Headquartered in New York, with an engineering office in Warsaw.
- Partners: HubSpot Solutions Partner , Microsoft partner , The Swarm partner.
What we do not do
- We do not sell for you or find leads. Your team closes deals on calls; on self-serve, the system takes buyers to a demo, trial or subscription.
- We do not sell a software subscription. Build is paid per verified result; Improve is a monthly fee only if you choose it.
- We do not keep your system in our accounts. Your HubSpot and your data are yours from day one, and the system is documented as we build it.
How we work
Diagnose, agree one fixed price, build result by result, verify before invoicing, hand over; Improve, a fixed monthly fee, only if you choose it. See how it works and pricing.
Talk to Sergey about your sales. Leave with a plan and one fixed price.
No fee for the diagnostic, and no obligation to buy.