On-demand
On-Demand & Retainers
Monthly senior capacity for ongoing fixes, CRO, and roadmap work.
How to choose your Shopify engagement model
Our Shopify engagement models give you three ways to work with our team. There is no single right way to engage a Shopify agency — the best model depends on how well-defined your scope is and how you prefer to manage budget and risk. Well-defined, one-off builds suit a fixed price; evolving or discovery-heavy work suits time & material; continuous improvement of a live store suits an on-demand retainer.
Many brands combine them: a fixed-price launch, then an on-demand retainer for growth. Below is a quick comparison, then a focused page for each model.
Three ways to engage our Shopify team
On-demand retainers, transparent time & material, or fixed-price projects — pick the model that fits your roadmap and budget.
Time & material
Time & Material
Transparent hourly billing for evolving scope and discovery work.
Fixed price
Fixed-Price Projects
A locked scope, timeline, and budget for well-defined builds.
Momentum
Work that keeps shipping
Whichever model you pick, improvements go live continuously.
Results
Growth you can measure
CRO, speed, and revenue tracked across every engagement.
Engagement models
When each Shopify engagement model makes sense
It usually comes down to three things: how well-defined your scope is, how you prefer to manage budget, and how much Shopify work is still ahead of you.
Fixed Price
Best for well-defined, one-off builds
- BillingSingle agreed price
- ScopeLocked — SOW & milestones
- CommitmentPer project
- RiskLowest — no surprises
Choose when the scope is clear — a theme build, a Shopify migration, a B2B or Plus launch.
On-Demand Retainer
Best for live, growing stores
- BillingReserved monthly block
- ScopeOngoing — CRO, perf, features
- CommitmentMonthly, adjustable
- RiskLow — flex up or down
Choose when the store is live and needs steady, ongoing attention without hiring in-house.
Time & Material
Best for evolving, discovery-heavy work
- BillingSenior hours worked
- ScopeFlexible — reprioritise each sprint
- CommitmentSprint by sprint
- RiskCapped per-sprint budget
Choose when the scope is still taking shape — complex integrations, roadmaps still being validated.
Most brands mix models over a store’s life — a fixed-price build to launch, time & material for a follow-on integration, then a retainer to keep improving. The same senior Mgroup team runs all three, so switching is seamless.
Pick the engagement model that fits
Each model has a focused page covering how it works, what is included, billing, and when to choose it.
Engagement model FAQ
Common questions about how brands engage and pay a Shopify agency.
Which engagement model is cheapest?
It depends on scope certainty. Fixed price is most predictable for a well-defined build; time & material is usually cheaper for evolving scope because you do not pay a risk premium; an on-demand retainer is most cost-effective for steady, ongoing work.
Can we switch models partway through?
Yes. A common path is a fixed-price launch, then an on-demand retainer for growth. We also move discovery-heavy phases to time & material and lock scope to fixed price once requirements are clear.
How do you decide which model to recommend?
On a short scoping call we look at how well-defined the work is, your budget model, and your tolerance for scope change — then recommend the model (or mix) that gives you the best value and the least risk.
Do all models include senior Shopify developers?
Yes. Every model is delivered by the same senior Shopify team — the difference is how scope and billing are structured, not who does the work.
Is there a minimum commitment?
Fixed-price and time & material are per-project. On-demand retainers start from a small monthly block of hours and scale up or down as your roadmap changes.
How do I hire a Shopify agency for one of these models?
Book a short scoping call or request a quote — tell us about your Shopify store and roadmap, and we will recommend the engagement model (or mix), confirm pricing, and how to get started before any work begins. Every model is delivered by the same senior Shopify team, so you hire the same experts whichever way you choose to engage.