CRM developer who builds custom CRMs around your sales process, with lead capture, WhatsApp and e-mail follow-up built in

When a custom CRM makes sense, and when it does not

Many businesses should use an existing CRM. If your sales process is standard, your team is small and a ready-made product covers it, a monthly subscription is cheaper than building anything, and I will tell you so. A custom CRM earns its place when the process is unusual, when leads arrive through several channels that off-the-shelf tools handle poorly, when you need different clients or branches to see only their own data, or when licence fees grow faster than the value you get.

I decide this with you before any code is written. I look at how a lead arrives, who touches it, what happens in the first hour, where leads are lost today and what you need to report. If a configured existing tool solves it, I can help set that up instead. If you need something built, we agree a short list of must-haves for a first version and grow from there.

Multi-tenant systems and keeping each client's data separate

If you are an agency, a franchise or a software business, one CRM often has to serve many customers. In a multi-tenant design every record carries a tenant identity, every server request is checked against that identity and the user's role, and a user from one account cannot read, change or even detect the data of another. I treat this as the first requirement of the design, not a feature added later, because a leak between customers is the most expensive mistake a CRM can make.

Permissions are enforced on the server for every page, API route, export and automation, never only by hiding a button in the interface. I write tests that try to read another tenant's records and to act with the wrong role, so isolation is proven by a failing attempt rather than assumed.

Connecting the CRM to ads, analytics and your website

My background is paid media, which is why I connect CRMs to marketing in a way many developers do not. Each lead keeps the campaign, keyword, page and click identifiers it came from. When a lead becomes a customer, that outcome can be sent back to Google Ads or Meta as an offline conversion, so bidding learns which clicks produce real revenue instead of form fills.

I set up Google Analytics 4 and Google Tag Manager events on the website side, and the CRM reports show cost per lead and cost per customer by channel once spend is connected. In audits I often find that marketing counts leads and sales counts something else, and the CRM becomes the shared definition.