Technical founders love to build internal tools.
It makes sense, you have the skills, you know exactly what you want, and it feels more efficient than paying for software that's only 80% right.
But the "build your own CRM" instinct is almost always wrong, and the math is simpler than it seems:
Engineering hours to build basic CRM: ~80 hours
Average loaded cost of engineering time: $75-150/hour
Total cost: $6,000 - $12,000
HubSpot free tier: $0
HubSpot Starter: $20/month
And that's before accounting for maintenance, documentation, onboarding new team members, and the opportunity cost of features you didn't build for your actual product.
The only exception that holds up: if a specific marketing workflow is genuinely core to your competitive moat. "I want it to work slightly differently" doesn't qualify.
This principle extends to the whole marketing stack. The time your team spends building and maintaining internal marketing tooling is time not spent on the product or talking to customers.
Marketing tools are commodities. Buy them, configure them, move on.
Where it does make sense to invest engineering time: proper event tracking and data architecture.
Setting up a CDP (Segment, RudderStack) correctly, defining your conversion events clearly, and making sure data flows cleanly between systems.
That's infrastructure that compounds in value over time and isn't something you can just buy off the shelf.
The full breakdown on when to build vs. buy across your marketing stack, and how to prioritize the technical setup work that actually matters, is on FoundersBar.
→ https://foundersbar.com/articles-and-research/marketing-tech-stack-for-startups-on-a-budget
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