Pick the partner who understands your revenue, not just your code. A custom commerce build is not a pretty science project. It must sell more, load fast, connect cleanly, and stop customers from rage quitting. That matters because the average online cart abandonment rate is 70.19% [source: Baymard].
TLDR: Choose a custom commerce development partner with proven store experience, clear process, honest pricing, and strong post-launch support. Ask for real case studies, not fluffy slides. For example, if a fashion brand cuts checkout from 5 steps to 3 and lifts conversion by 18%, that is useful proof. The best partner feels like a product teammate, not a mystery box with invoices.
Start with the business goal
Before you call agencies, know what you want fixed.
Do you need more sales? Faster checkout? Better product search? A cleaner admin panel? Fewer manual exports? Say it out loud.
Custom commerce can mean many things. It may be a headless store. It may be a Shopify Plus app. It may be Adobe Commerce. It may be a full custom build. The tech matters. But the goal comes first.
A good partner will ask about:
- Revenue targets
- Average order value
- Current conversion rate
- Traffic sources
- Top customer complaints
- Manual tasks your team hates
If they only talk about frameworks, run. Well, maybe walk briskly. With coffee.
Check their commerce experience
Building a store is not the same as building a brochure site.
Commerce has carts, tax rules, shipping, inventory, payments, discounts, refunds, subscriptions, customer accounts, search, fraud checks, and analytics. One tiny mistake can cost real money.
Ask for work that looks like your project. Not identical. Just close enough.
If you sell 40,000 SKUs, do not hire a team that has only built five-page websites. If you sell subscriptions, ask to see subscription work. If you sell globally, ask about currency, tax, and checkout rules.
It drives me crazy when teams say, “Yes, we can do that,” before asking one serious question. That is not confidence. That is guessing in fancy shoes.
Look for proof, not promises
Case studies should include numbers.
Pretty screenshots are nice. Results are better.
Ask for proof like:
- Conversion rate lift
- Page speed gains
- Lower cart abandonment
- Higher repeat purchase rate
- Less time spent on admin work
- Fewer support tickets
A strong case study may sound like this: “We rebuilt checkout for a home goods store. Mobile load time dropped from 4.8 seconds to 1.9 seconds. Checkout completion rose by 14% in eight weeks.”
That is useful. That tells you they can connect work to money.
Ask how they plan projects
A messy build gets expensive fast.
Your partner should have a simple process. It does not need to be a 90-page ritual. It does need structure.
Look for stages like:
- Discovery: They learn your goals, systems, users, and pain points.
- Scope: They define what will be built and what will not.
- Design: They map the buyer journey and admin flows.
- Development: They build in clear sprints.
- Testing: They test devices, browsers, payments, orders, and edge cases.
- Launch: They release with a plan, not with panic.
- Support: They fix, improve, and measure after launch.
The catch is simple. If the process sounds fuzzy now, it will feel worse later. Expect delays, odd invoices, and meetings where everyone says, “Wait, who owns that?”
Check technical fit
You do not need to become a developer. But you should know if their tech choices fit your store.
Ask why they recommend a platform. Ask what the tradeoffs are. Ask what happens if traffic doubles. Ask how content updates work. Ask how your team will manage products.
Good partners explain tech in normal language. They do not hide behind acronyms.
Here are useful topics to cover:
- Platform choice: Shopify Plus, BigCommerce, Adobe Commerce, WooCommerce, custom, or headless.
- Integrations: ERP, CRM, PIM, POS, warehouse, email, loyalty, and payment tools.
- Performance: Speed on mobile and desktop.
- Security: Data handling, permissions, fraud controls, and payment safety.
- Scalability: How the store handles growth, sales spikes, and new markets.
Meet the actual team
Do not only meet the sales person.
Meet the project manager. Meet the lead developer. Meet the UX person if they have one. These are the humans who will shape your store.
Ask who writes the code. Ask who reviews it. Ask who joins weekly calls. Ask if work is outsourced. Outsourcing is not always bad. Hidden outsourcing is bad.
You want clear roles. You want calm communication. You want people who say, “We found a risk,” before that risk becomes a fire.
Get serious about communication
Commerce projects have many moving parts. Silence is scary.
Your partner should provide updates in a simple rhythm. Weekly is common. Big projects may need more.
Ask what tools they use. Ask how bugs are reported. Ask where decisions are stored. Ask how urgent issues are handled.
A good update includes:
- What was finished
- What is being worked on now
- What is blocked
- What decisions are needed
- What changed in scope, budget, or timing
This saves everyone from the dreaded Friday surprise. Nobody enjoys a 4:42 p.m. message that starts with, “Small issue…”
Understand pricing before you sign
Cheap can get expensive.
That does not mean you should pick the highest quote. It means you should understand what is included.
Ask for a clear breakdown. Strategy. UX. Design. Development. Integrations. QA. Migration. Training. Support. Maintenance.
Also ask about what is not included. This matters a lot.
Watch for vague lines like “custom functionality” with no detail. That is where surprises hide.
A good partner talks about budget like an adult. They explain options. They show where you can save. They warn you where saving may hurt.
Test how they think
Give them a real problem.
For example: “Our mobile checkout is slow, and customers drop off after shipping.”
Then listen.
A weak partner jumps straight to a rebuild. A strong partner asks for data. They may review analytics, session recordings, payment errors, shipping rules, and page speed. They may suggest a smaller fix first.
That is a great sign.
You want a partner who solves the right problem. Not the loudest one.
Ask about launch day
Launch day should be boring. Boring is beautiful.
Ask for the launch plan. It should include backups, testing, redirects, payment checks, order checks, analytics checks, and rollback steps.
Traffic should be watched. Errors should be watched. Orders should be watched.
Also ask who is on call. If something breaks, you do not want to hunt through old email threads while customers are yelling in live chat.
Do not forget post-launch support
Your store is never truly “done.” Sorry. Annoying, but true.
Products change. Promotions change. Search habits change. Apps break. APIs update. Customer behavior shifts.
Ask for support options before you sign the main contract. Monthly retainers are common. So are support blocks.
Good support may include:
- Bug fixes
- Speed checks
- New features
- Security updates
- Conversion improvements
- Reporting help
The best partners keep improving the store after launch. Small wins add up. A faster product page here. A better email capture there. A cleaner return flow next month.
Use a simple scorecard
Make the choice less emotional. Score each partner from 1 to 5.
- Commerce experience
- Relevant case studies
- Technical fit
- Clear process
- Communication style
- Pricing clarity
- Support plan
- Cultural fit
Then compare. The winner may not be the flashiest team. It may be the one that listens, explains, and spots risks early.
Final gut check
Choose the partner you trust with real money moving through real carts.
They should make the project feel clearer. Not heavier. They should challenge weak ideas. They should explain hard things simply. They should care about customers, not just code.
If a team brings sharp questions, honest limits, and proof of results, keep talking. If they bring buzzwords, vague dates, and a magical price, smile politely. Then back away from the cart.
