Custom E-Commerce Development Services: Building Beyond the Platform

Most companies that rank for “e-commerce development services” want to build you a store. They will set up Shopify, theme a Magento site, or wire together a WooCommerce plugin stack and call it done.

An e-commerce platform is really a custom web application with a checkout, so the same logic applies as with any custom web app development company: hire a team that stays, not a project shop.

Full Scale doesn’t do that, and on purpose.

I’ve spent more than twenty years building software companies. I co-founded VinSolutions, the #1 customer relationship management (CRM) platform in the auto industry, and later started Stackify, a developer tools company I sold in 2021. Both were software products that processed real money and real transactions at scale. Neither one was a storefront you configure from a dashboard.

That’s the distinction this whole guide is about. There is a point where commerce stops being a store you set up and becomes software you have to build. The companies that win past that point figured out the difference early.

What “e-commerce development services” actually means

The phrase covers two completely different kinds of work, and the search results blur them together on purpose.

The first kind is storefront work. You pick a platform like Shopify or Adobe Commerce (formerly Magento), choose a theme, install some apps, and launch. It’s fast, it’s cheap to start, and for a lot of businesses it’s the right answer. Plenty of agencies do this well, and if that’s what you need, hire one of them.

This matters more every year. E-commerce is now about 16 percent of all US retail sales and still growing faster than the rest of retail, according to the US Census Bureau. The businesses pushing the high end of that number stopped running off-the-shelf stores a long time ago.

The second kind is custom commerce engineering. This is the software underneath the store: the checkout logic, the pricing rules, the inventory system, the integrations with payments and shipping and tax, the data pipeline, and everything that has to keep working when traffic spikes. It’s a real software product, and it needs real software engineers.

Here’s the split, side by side.

	Storefront / platform work	Custom commerce engineering
What you get	A configured store on Shopify, Magento, BigCommerce	Software built and owned by your team
Who does it	A storefront agency or platform partner	Software engineers
Best for	Standard catalog, standard checkout, early stage	Custom logic, heavy integrations, scale, B2B
Cost over time	Low to start, capped by what the platform allows	Higher to build, no ceiling on what you can do
What Full Scale does	No	Yes

When people search for e-commerce development services, a lot of them think they need the first kind. The ones who write to us usually need the second and haven’t said it out loud yet.

When you’ve outgrown the platform

A SaaS platform is the right call when your catalog is simple and your checkout is standard. The trouble starts when your business gets specific and the platform won’t bend.

You’ll know you’re there when you hit a few of these:

• You need a checkout or pricing rule the platform flat-out won’t allow, like contract pricing for B2B buyers or bundles the app store can’t handle.
• You’re stitching the store into an enterprise resource planning (ERP) system, a warehouse, a payment processor, and a tax engine, and the off-the-shelf connectors keep breaking.
• Your traffic outgrows the plan, and you’re paying more every year for less control.
• Your data is trapped inside the platform and your team can’t get at it to do anything useful.
• You’re building a marketplace, a subscription model, or B2B logic the platform was never designed for.

I lived a version of this at VinSolutions. We weren’t selling a generic product to generic users. We were building software for car dealers, an industry with its own rules, its own workflows, and its own way of doing business. No template was going to cover that. We had to build it.

Once your commerce has logic nobody else has, no platform is going to hand it to you. You have to build it.

That’s the moment custom e-commerce development services start to matter, and it’s a hiring decision more than a software decision.

Custom commerce is a software problem, not a storefront problem

This is the part the storefront SERP never says: at a certain size, commerce is just software, and it should be staffed like software.

A lot of larger commerce companies have moved toward what’s called headless or composable commerce, where the front-end customer experience is split off from the back-end commerce engine and the two talk through application programming interfaces (APIs). The industry group pushing that approach is the MACH Alliance, and the shift is real. It exists because growing companies kept hitting the wall of the all-in-one platform and needed to own their own software again.

Once you go that direction, the work is engineering, plain and simple. You’re building APIs and services. You’re tuning a database so it doesn’t fall over on a sale day. You’re handling payments and security and fraud. You’re making sure the system stays up when ten times the normal traffic shows up at once.

None of that is theme configuration. It’s the same work my teams have done on every serious software product I’ve built.

And the engineers who are good at it share something that has nothing to do with the framework they use. They understand the business problem before they write a line of code. The best commerce engineers ask why a pricing rule exists before they build it, not after it breaks in production. That’s the difference between someone shipping tickets and someone you’d trust with your revenue.

What this looks like at scale: AMC Theatres

If you want to see custom commerce engineering at full size, look at AMC Theatres, a Full Scale client.

When Derrick Leggett, AMC’s chief information officer (CIO), joined the company twenty years ago, AMC ran about 170 theatres. There was no ticketing on the website. There was no mobile app. Today AMC runs over 900 theatres and operates the largest movie-theatre ticketing platform in the world.

Think about what that platform actually is. It’s online ticket sales, the A-List subscription program, a multi-tier loyalty program, even an annual popcorn subscription. Every one of those is commerce, and every one of them is custom software. You cannot buy that off a shelf.

AMC didn’t build it with a storefront agency. They built it with an integrated engineering team that includes Full Scale developers in the Philippines working right alongside AMC’s US engineers. As Derrick puts it, “It’s a fully integrated team. It’s just some of the people happen to be living in the Philippines.”

What he refuses to do is run the old outsourcing model, where engineers sit walled off behind a vendor account manager and you pay 30 to 40 percent overhead for layers nobody can explain. His developers join the standups, work in the same tools, and ship against the same roadmap. That’s how serious commerce software gets built.

The engineers you actually need for custom commerce

If you’re staffing a custom commerce build, you’re not hiring “Shopify people.” You’re hiring software engineers, and the roles look like any other serious software product.

You need back-end and API engineers to build the commerce engine, the integrations, and the services that everything else depends on. You need full-stack engineers who can move between the customer-facing experience and the systems behind it. You’ll want strong people on data and on performance, because commerce lives and dies on whether the site stays fast and stays up.

On the stack itself, custom commerce gets built on the same tools as the rest of modern software. We see a lot of Node.js and React on the JavaScript side, .NET on the enterprise side (AMC runs on .NET), and Python for data and services work. The right choice depends on what you already run and where your team’s strengths are, which is a decision a technical leader should make deliberately. Our guide to choosing a tech stack digs into how to think it through.

The point is that these are general software engineers who happen to work on commerce. That’s a much bigger and deeper talent pool than “platform specialists,” and it’s the pool you want.

Build, buy, or augment: how to decide

Most commerce companies land on one of three paths. Each is right in different situations, and pretending otherwise would be a sales pitch instead of advice.

Buy a platform when you’re early, your catalog is standard, and speed to launch matters more than control. Don’t build custom software you don’t need yet. A good cost-to-build analysis usually shows that a platform wins at this stage, and that’s fine.

Build with an in-house US team when commerce is your entire business and you have the budget. The catch is the budget. A senior US engineer runs $180,000 to $250,000 all-in, and hiring one can take three to six months in a market that has not gotten easier. For most companies, that math is the actual constraint, not the talent.

Augment your team with offshore engineers when you need real engineering capacity without the US price tag or the hiring delay. This is what Full Scale does. We place senior engineers in the Philippines who work as part of your team, full-time and long-term, at a client rate of $30 to $40 an hour. That same team can handle offshore web development end to end, not just the storefront. That’s a fraction of US cost, and the advantages of offshoring compound over a multi-year build.

The reason this works is not a trick. There are smart people all over the world, and the gap between US and offshore rates is about cost of living, not skill. The Philippines in particular has deep English fluency and a strong software talent base, which is most of why our staff augmentation model holds up.

How Full Scale staffs custom commerce teams

We’re not a storefront agency and we’re not a project shop. We aren’t in this for some three-month engagement.

What we do is build long-term custom software development teams that work directly for you. The engineers we place are senior, with 7-plus years of average experience, and they integrate the way AMC’s team does: same standups, same tools, same standards, no middleman in between. Our developer retention sits at 93 percent, so the person who learns your commerce system this quarter is still on your team next year.

The philosophy behind how we build teams comes from my book, Product Driven: engineers do their best work when they understand the product and the customer, not just the ticket. For commerce software, where a single pricing bug can cost real money, that mindset is the whole game. If you’d rather hand off requirements and hope, hire a different kind of vendor. If you want engineers who treat your revenue like it’s theirs, that’s the model.

Ready to build beyond the platform?

If you’ve outgrown your e-commerce platform and need real engineers to build what comes next, let’s talk. Book a 15-minute discovery call and we’ll walk through what your commerce software needs and which engineers can build it.