Build vs. Buy: When to Outsource Backend Development (and When to Keep It In-House)

Every article on this question hands you the same framework. Build the stuff that’s your competitive advantage. Buy the commodity stuff. Most teams end up with a hybrid. Then a decision tree and a contact form.

It’s not wrong. It’s just framed wrong for the backend.

I’ve been on both sides of this. I bootstrapped Full Scale‘s predecessor thinking by building VinSolutions in-house, the number one CRM in automotive, before it sold. Then I built Full Scale, which is now the outsourced backend team for more than 80 companies. So I’ve made the build call with my own money, and I’ve been the team on the other end of the outsource call hundreds of times.

Here’s what I’ve learned: for the backend, the build-vs-buy question is the wrong fork. The real decision isn’t “build it ourselves or buy a finished thing.” It’s “hand the backend to a vendor as a walled-off project, or build a long-term team that owns it with you.” Those are completely different bets, and the backend is exactly the place where the difference matters most.

Let me walk through it.

Build, buy, outsource: what each one actually means

The three words get used loosely, so here’s what they mean for a backend.

Option	What it is	Best for
Build in-house	You hire and manage the backend engineers yourself	Backend logic that is your core competitive advantage and that you’ll iterate on forever
Buy	You use an existing product or platform instead of writing it	Commodity capabilities: auth, payments, email, search. Don’t rebuild Stripe
Outsource	A team outside your payroll builds and runs the backend	Speed, scarce skills, or scale you can’t hire for fast enough

The “buy” decision, choosing a SaaS product over writing custom code, is its own question. We wrote about build vs. buy software separately, and AI has shifted that math a lot. This post is about the third column: when it makes sense to outsource backend development, and how to do it without handing away the part of your product you most need to control.

The real question isn’t build vs. buy. It’s project vs. team.

When most people say “outsource the backend,” they picture a vendor. You write a spec, they disappear, and a few months later you get a system back. That’s the project model, and for a backend it’s where things go wrong.

A backend isn’t a thing you buy once. It’s the logic, the data, the security, and the scaling that you live with for years. When you hand that to a vendor as a fixed project, you get a system only they understand, built to the letter of a spec that was already out of date when you wrote it. The day they walk away, you own something you can’t maintain.

I learned the version of this that works at Stackify. We worked with a development firm in Uruguay, and it worked because they didn’t operate like a vendor behind a wall. They genuinely owned the product direction, and I later hired those developers directly onto our team. The setups that failed were the ones where nobody owned the product. The wall was the problem, not the location.

So the better question is: are you outsourcing a project, or building a team? For a backend, you almost always want the team. That’s the whole idea behind staff augmentation, and it’s why I make the distinction so hard.

When to keep the backend in-house

Keep it in-house when the backend itself is your competitive advantage and you have the people to build it.

If your backend is the product, the matching engine, the pricing algorithm, the thing customers can’t get anywhere else, you want that knowledge living inside your walls. The same is true if you already have a strong senior engineering team that can hire and mentor more. You don’t outsource what you’re already great at.

The catch is cost and speed. A senior backend engineer in the US runs about $200,000 a year all in once you count benefits, recruiting, and overhead, and the search to find one drags on for months. If you can afford that and wait for it, in-house is a fine answer for your core backend.

Most companies can’t afford to do all of it that way, which is where the next option comes in.

When to outsource backend development

Outsource the backend when you need speed, when you need skills you don’t have, or when building the team in-house would eat a budget you’d rather put into the product.

The cost gap is real. You can hire senior global talent for 50 to 80 percent less than US rates, and that’s a cost-of-living difference, not a skill difference. Smart backend engineers are everywhere. The hard part is screening for the right backend developer skills. The trap is treating that gap as a reason to buy the cheapest possible hour. I call that cheapshoring, and the backend is where it does the most damage, because a cheap engineer’s bad architecture decision is invisible until it’s expensive.

And cost is no longer even the main reason companies outsource. Deloitte’s 2024 Global Outsourcing Survey found cost as the number one driver fell from 70 percent in 2020 to 34 percent in 2024, with talent access and speed now ranking as high or higher. People outsource the backend to get good engineers fast, not just cheap ones.

The way to do it without losing control is to outsource the team, not the project. You want vetted senior engineers who join your standups, your codebase, and your roadmap, and who own their work the way an employee would. No middleman, no project manager you have to talk through, no developers hidden behind an account rep. That’s staff augmentation, and it’s the model I built Full Scale around precisely because the walled-off project model kept failing the people I talked to.

The integrated-team model, with a real example

The clearest proof that you can outsource the backend without losing ownership is AMC Theatres. They run the world’s largest movie-theatre ticketing platform, and their engineering team spans the US, South America, India, and the Philippines, mostly remote. The Full Scale engineers in the Philippines aren’t a vendor AMC files tickets with. They’re full AMC engineers.

Their CIO, Derrick Leggett, put it better than I can:

> “It’s a fully integrated team. It’s just some of the people happen to be living in the Philippines.”

That’s the model. The backend is core to AMC’s business, and they didn’t keep it all in-house and they didn’t buy it as a project. They extended their team with engineers who own the work. The retention holds because of it: ours sits above 93 percent, so the team that learns your backend this year is the team that still has it next year. That continuity is the whole point with a backend, and it’s the thing a project vendor can never give you.

What outsourcing the backend actually costs

The honest cost picture has three parts.

The rate is the obvious one. A fully-loaded offshore engineer through a team model runs around $35 an hour, against $80 to $150 or more for a US contractor. But as I argued in the backend development cost breakdown, the rate is the least important number. The architecture judgment behind it costs or saves far more.

The second cost is integration. A team you embed has a real but short ramp: a couple of weeks to learn your system, not months. A project vendor has no ramp and no retained knowledge, which feels cheaper and costs more the moment you need a change.

The third cost is the one nobody quotes: what you pay later if you outsource the wrong way. A black-box backend you can’t maintain is the most expensive thing on this list, even though it never shows up as a line item.

The hybrid most teams actually land on

In practice, most companies don’t pick one column. They build the backend logic that’s their advantage, buy the commodity pieces, and outsource the rest to a team that works as an extension of theirs.

That’s not a compromise. It’s the right answer for most teams, and it’s a core idea in my book, Product Driven: put your own people on the problems that are uniquely yours, and get great help on everything else. The mistake is letting “outsource” mean “hand it to a vendor behind a wall.” For a backend, outsource the team, keep the ownership.

If you’re weighing whether to build your backend team in-house or extend it with senior engineers who own their work, schedule a call with us and we’ll talk through what your situation actually calls for.