As a PM, your job is to deliver impact, but it's also to manage risk and be a good steward of your company's resources. So, before you commit your best engineers to an 18-month DIY build, you need a clear-eyed framework for the true cost.
Building in-house isn't just an engineering task; it's a multi-million dollar financial bet with a long and uncertain payback period.
The True Cost of 'Building' - A Back-of-the-Envelope Calculation
Let's assume a scaled marketplace needs a 6-person team (3 ML, 2 Data, 1 Ops). At a loaded cost of $200k/engineer, that’s a $1.2M annual team cost. This isn't a one-time project; it's a permanent operational tax.
Here’s what that does to your payback period:
Delivering a sustained 1.2% lift across a $100M business from a single initiative is a monumental task. And that's just to break even a year after you launch. Worse, there's a significant risk that after 18 months, your v1 model underperforms, and the project becomes a "Money Pit", a high-effort, low-impact catastrophe.
A New Framework: Buy the Commodity, Build the Differentiator
In 2025, a real-time ranking engine is a commodity, like a payment processor or a CRM. It's complex, critical infrastructure that you should not be building from scratch. The smart play is to buy the engine and let your team focus on what truly differentiates you: your user experience, your brand, and your unique merchandising strategy.
An API-first platform like Shaped completely changes the math.
- Upfront Investment: $0.
- Time to Value: Weeks, not years.
- Ongoing Cost: A predictable SaaS fee, not a permanent $1.2M/year headcount.
- Payback Period: You can achieve a positive ROI in the first quarter of use.
By using an API, you transform personalization from a high-risk "Major Project" into a high-impact, low-effort "Quick Win." You get the business impact without the financial gamble.
Before you greenlight that epic, run the numbers. The most strategic decision you can make is to focus your precious engineering resources on what makes your marketplace unique, not on rebuilding a commodity.
Want help building a winning business case for your team? Contact us, and we'll help you build an ROI model for your marketplace.
