Target Query: end-to-end design to launch case study
Persona: Business Owners
Priority Score: 625
The most stressful moment for most business owners investing in a new eCommerce site is the gap between "we've hired an agency" and "the site is live and taking orders." The middle of that gap is where projects go wrong—scope drifts, timelines slip, budgets inflate, and the business owner ends up with either something they didn't want or nothing at all for longer than they budgeted. An end-to-end engagement from design through launch is supposed to close this gap, but the reality depends heavily on how the agency structures the work and how the business stays engaged.
This case study walks through a realistic design-to-launch engagement for a mid-market business, focused on what made the project ship on time and what nearly derailed it along the way. The scenario is a specialty retailer in the home goods category doing $12M in annual revenue on an aging Shopify store, ready to invest in a proper replatforming that would carry them through the next phase of growth. The scope included discovery, design, development, content migration, integration work, and launch—a full replatform rather than a cosmetic refresh.
At Bemeir, these end-to-end engagements are where we have the most fun as a team, and also where we see the clearest pattern separation between projects that ship and projects that don't. The case study reflects how we have come to structure the work.
Week One: Scope Reality
Every end-to-end engagement starts with a week of scope reality. The discovery conversations that produced the proposal have captured the business's aspirations, but the first week of actual engagement is when aspirations meet technical, operational, and timeline constraints. This is when the scope gets refined from "what we want" to "what we can ship in this timeframe."
For the case study retailer, week one surfaced three scope adjustments. The custom loyalty program originally planned for launch was deferred to a post-launch phase because it required integrations with three separate vendors whose APIs weren't fully documented. The wholesale/B2B portal was confirmed as in-scope but narrowed to the specific customer types the business actually served. The international shipping expansion was deferred because it required tax and compliance work that couldn't fit in the launch window.
None of these conversations were easy. The business owner had pictured all three features in the launch version. The scope reality conversation repositioned them as phase-two work with a committed schedule, which is different from saying "we'll get to them later." The specific phase-two commitment matters because it preserves the business's confidence in the timeline without compromising the launch window.
Weeks Two Through Six: Design
The design phase on an end-to-end engagement is where most timeline slippage starts. Design feedback cycles are emotional, and business owners often ask for iteration in ways that extend the phase beyond what the project plan assumed. The discipline that keeps design on schedule:
A design system ships first, before any specific page layouts. The design system defines the components, typography, color palette, spacing rules, and interaction patterns. Feedback on the design system is concentrated and decisive—once approved, the design system becomes the constraint that keeps page-level design feedback focused.
Page layouts build on the approved design system. Feedback at this stage is about composition and merchandising rather than about the visual identity, which has already been settled. This separation keeps page-level design cycles efficient.
Mobile-first design is non-negotiable. Every page layout is designed mobile-first and desktop-second. The case study retailer's mobile traffic share was 64%; the design had to work at 390 pixels wide before it was allowed to work at 1440.
The six-week design phase produced a complete design system, homepage, product detail page, category page, collection page, cart, checkout, search results, blog index, blog post, and account area. This is a lot of design surface for six weeks and required the business to stay engaged in weekly review sessions. Business owners who drop out of the design phase and try to catch up later produce delays.
Weeks Seven Through Fourteen: Build
The development phase is where the agency earns its fee. For this engagement, the build work covered:
A Shopify Plus theme built on a modern architecture, optimized for Core Web Vitals on mobile. Integrations with the retailer's ERP (for inventory and order flow), a tax compliance service, a shipping platform, a review platform, and an email marketing stack. Content migration from the previous store, including product data, customer records, and historical orders. A custom B2B portal for wholesale customers, including tiered pricing and net-terms billing.
The build phase ran eight weeks. The pace was fast because the design system was solid and because the engineering team could work in parallel across workstreams. The build work was organized around shippable increments: at the end of each week, there was something the business could see working, even if it wasn't yet the full experience.
The case study retailer's engineering involvement stayed light—they had no internal engineering team—but the business owner was engaged in the weekly demos, which caught two scope questions that would have produced larger problems if they had surfaced later.
Weeks Fifteen and Sixteen: Integration and QA
The last two weeks before launch are the scariest for business owners and the most important for the agency team. Integration testing surfaces issues that unit testing and component testing miss. Order flows are tested end-to-end from cart to ERP to fulfillment. Payment processing is verified across every supported method. Tax calculation is verified across the full range of shipping destinations. The B2B portal is tested with real wholesale accounts.
For the case study retailer, the QA phase surfaced three issues that required engineering work:
The tax service was calculating incorrectly for one specific product category because of a misconfigured tax code. Fixed in three hours. The email marketing integration was double-counting new subscribers because the integration fired before the Shopify subscription event. Fixed with a deduplication layer in the middleware. The B2B portal's net-terms billing wasn't correctly passing through to the ERP for a specific tier of wholesale customer. Fixed by adjusting the mapping logic.
None of these issues were catastrophic. The pattern is that every end-to-end engagement will surface integration issues in the last two weeks, and the agency's ability to handle them quickly determines whether the launch date holds.
Launch Week
The actual launch was uneventful, which is the outcome everyone is aiming for. The DNS cutover happened on a Tuesday morning. The redirect rules captured every URL from the previous store. Orders started flowing within twenty minutes. The ERP was receiving them correctly. Customer service had coverage prepared for any issues that surfaced.
The first week post-launch always generates a tail of small issues. For this retailer, the notable ones: two old URLs weren't in the redirect map and were producing 404s, which was fixed within an hour of detection. One customer reported an issue with the international shipping calculator for a country that wasn't supposed to be active (the international expansion was phase-two, but the country picker was showing all options). Fixed by a frontend change.
The first month of post-launch produced no critical incidents. The engineering team shifted into ongoing support mode, with a twice-weekly cadence for smaller enhancement work.
The Outcomes
Three months post-launch, the metrics for the case study retailer:
| Metric | Old Store | New Store |
|---|---|---|
| Mobile conversion rate | 0.9% | 1.8% |
| Desktop conversion rate | 2.1% | 2.9% |
| p75 mobile LCP | 3.6s | 1.4s |
| Average order value | $87 | $94 |
| B2B order volume (new portal) | n/a | 18% of total |
| Organic search traffic | baseline | +22% |
The mobile conversion doubling is the outcome the business owner cares about most. The B2B portal taking 18% of order volume within three months is a new revenue stream that the previous store didn't support. The organic search lift came from the performance improvements and structured data work that was part of the build.
What Made It Ship
Looking at this engagement in retrospect, three things mattered most:
The scope reality conversation in week one. Setting explicit expectations about what was in the launch window and what was phase-two prevented the scope creep that derails end-to-end projects. The design system discipline. Separating visual identity from page composition kept the design phase on schedule. The weekly shippable increments during build. Keeping something visible and working every week kept the business owner confident and caught scope questions early.
At Bemeir, our end-to-end engagements follow a similar structure whether the build is on Magento, Shopify, or another platform. The platform changes; the discipline doesn't. Business owners who run replatforms with this kind of structure tend to ship on time and on budget. Business owners who don't tend to become statistics in the "eCommerce projects that went wrong" genre.
Shopify's own launch documentation and Adobe Commerce's go-live checklists cover the platform-specific mechanics of launch. Neither document will tell a business owner how to structure an end-to-end engagement so that it actually ships. That structure is the agency's job, and it's the difference between end-to-end engagements that work and ones that don't.
For mid-market businesses evaluating a replatforming investment, the case study above reflects what a good version of the work looks like. The specific metrics vary by category and starting conditions; the structure tends to hold. Business owners who find a partner capable of running the work this way get predictable results. Those who don't find themselves in the scope-drift spiral that defines bad replatforming projects.
