Disclaimer: this article is for business education only. It is not legal advice or a contract template. Every agreement should be reviewed by a lawyer who understands IT delivery and the governing law.
An ecommerce development agreement does not need a hundred pages to protect both sides. It does need to reflect the way the team will actually work. An iterative project needs room for decisions and change; a fixed scope needs precise acceptance criteria.
A strong agreement cannot replace a competent team and regular communication. It should make the difficult moments easier: when the budget is running out, an integration fails or a campaign deadline suddenly matters more than the original plan.
Match the agreement to the delivery model
Fixed price works when the outcome can be described well and the assumptions are stable. Time & Materials gives more flexibility, but it needs a visible backlog, regular reporting and control over priorities. A hybrid model can combine paid discovery with separately priced implementation stages.
No commercial model removes uncertainty. Fixed price does not make a vague requirement clear, and T&M is not permission to work without limits. The agreement should describe how decisions are made, not just name the billing model.
1. Budget and time limits in Time & Materials
Under Time & Materials, the client pays for work actually completed. The model is flexible, but it needs control. An agreement or statement of work can define the budget for a period, reporting rules, authorised approvers and the threshold at which further work requires fresh approval.
Also specify whether unused capacity carries over, how meetings and analysis are charged and what happens when a scope change is requested. A financial cap without a decision process offers limited protection.
A short reporting rhythm works well in practice: the plan for the period, the spend so far and the forecast to completion. If the forecast changes, the client hears about it before the cap is exceeded—not when the invoice arrives. The contract should support that conversation.
2. Intellectual property, repository access and licences
The agreement should distinguish code created specifically for the project, pre-existing supplier components and third-party software. It should define ownership or licence terms, the point at which rights are granted or transferred, repository access and the documentation to be supplied.
Under section 90(3) of the UK Copyright, Designs and Patents Act 1988, an assignment of copyright is not effective unless it is in writing and signed by or on behalf of the assignor. Section 91 also addresses signed agreements concerning copyright in work that will be created in the future, which is particularly relevant to software development. The contract should identify the deliverables and rights covered, and its wording should be reviewed by a solicitor qualified in the relevant UK jurisdiction.
A separate schedule should cover Magento, Hyvä, paid extensions, fonts, imagery, open-source libraries and SaaS services. Not every asset can be transferred to the client; some remain subject to the vendor’s licence.
Repository access is worth resolving at the start as well. A client should not discover during an exit that the source code, commit history or deployment configuration lives only in a supplier’s private account. Ownership of the code and practical access to it are related, but they are not the same clause.
3. Definition of a critical defect and response time
Terms such as “serious error” are too vague. Define incident levels by business impact. A critical incident might mean that the store is unavailable, customers cannot order, payments are calculated incorrectly or a security breach has no viable workaround.
Beyond initial response, define support hours, the reporting channel, update frequency, expected workaround time and post-incident analysis. Resolution time cannot always be guaranteed when a third-party provider causes the failure, but the communication and escalation process should be clear.
Separate response time from resolution time. The team can control how quickly it acknowledges and investigates an incident. A full repair depends on the cause, available data and outside providers. For a critical failure, a safe workaround—such as disabling a broken payment method—may matter more than an arbitrary promise of a permanent fix within two hours.
4. Separating discovery from implementation
For a complex programme, a separate discovery stage protects both parties. Processes, integrations, architecture, risk and backlog are mapped first; the parties then decide the implementation scope and commercial model using better evidence.
The discovery agreement should define tangible outputs: a system map, requirements, acceptance criteria, prototypes for key journeys, an estimate and a phased plan. Subject to the agreed rights, the client should be able to use those materials regardless of who completes the implementation.
This matters when discovery shows that the original idea is too costly or risky. The point is to create an informed choice to reduce, phase or redirect the project—not to produce an elegant introduction to a delivery decision that was already made.
Project handover and exit
A good agreement also describes a calm separation. The handover list may cover repositories, infrastructure access, documentation, configuration backups, third-party accounts, known defects and the knowledge a new team needs to operate the system.
Define how much time the supplier has for handover and how that work is charged. Key accounts—domain, hosting, analytics, payments and source control—should ideally belong to the client’s organisation from the beginning. That is simpler and safer than trying to recover access at the end.
What else should the agreement define?
- scope and the change request procedure,
- responsibility for data, integrations and third-party providers,
- acceptance criteria and review deadlines,
- security, backups and environment access,
- warranty, maintenance and post-launch development,
- termination and project handover.
The best contract reflects the real delivery process and is clear enough for people other than lawyers to understand. Combine legal review with a technical review: a solicitor can assess whether the wording works under the chosen law, while a technical reviewer can spot promises that cannot be measured or delivered sensibly.
