Every founder building a product hits this fork, and most of the advice available is written by someone selling one of the two options. So here's the version that includes when each one is wrong.

The real cost of hiring in-house

The salary is the number everyone quotes and the smallest part of the cost. Add recruiting time, benefits, equipment, and the two to three months before a new hire is genuinely productive in your codebase.

Then the structural part: one engineer is one point of failure. They get sick, take leave, or leave entirely, and your roadmap stops. So one hire becomes two, and two need someone to lead them, and now you're running an engineering department.

If you're not technical, there's a further problem. You're managing work you can't evaluate. You'll find out whether the architecture was sound about a year later, when you try to build on it.

When in-house is still right

When software is your long-term core product, you have the budget to staff a real team, and you can absorb the hiring cycle. If you're going to be building continuously for years, owning that capability makes sense. A partner is a bridge in that scenario, not a destination.

What a partner actually gets you

A team that already works together, a senior who owns delivery, and no hiring cycle. Usually for less than one fully loaded senior salary in the US.

The speed difference is the underrated part. There's no recruiting, no ramp. Work starts.

When a partner is the wrong call

This is what the agencies don't write. A partner is wrong if you pick on price — a low quote generally means juniors with no senior oversight, and you pay the difference later in a rebuild. It's wrong if they won't commit to a fixed scope, won't name the senior on your project, or can't show relevant experience.

And it's wrong if what you actually need is deep, permanent in-house ownership and you're using a partner to avoid a hiring decision you'll have to make anyway.

A simple way to decide

Two questions. Is software your core long-term product, with budget to staff it properly? And do you need to move now, with limited tolerance for hiring delays?

Need speed and senior judgment without building an org chart: partner. Staffing a long-term product team and able to absorb the ramp: in-house. Plenty of founders do both in sequence — ship with a partner, validate, then hire around something proven.

We wrote the longer comparison, including the failure modes of each, in in-house team vs. a development partner.