Industries

IT solutions for e-commerce

An online store is an information system in its own right: catalogue, prices, stock, payment, shipping, customer service and marketing all have to work together, continuously. Agencei supports merchants who sell online, whether they run WooCommerce, PrestaShop or a custom-built platform.

Our work covers building and redesigning stores, integrating payment providers and carriers, synchronising with the ERP or management software, optimising performance and securing the infrastructure. We also handle maintenance and troubleshooting when a store slows down, crashes or gets compromised.

What we aim for: a store that stays available during commercial operations, orders that flow without manual re-entry, and a technical foundation that does not hold the marketing team back.

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Industry challenges

Peak traffic and commercial operations

Sales, Black Friday, advertising campaigns: the store has to absorb load spikes without slowing down or losing orders, even though traffic is far lower the rest of the year.

Payment and shipping integrations

Payment providers (Stripe, PayPal, Adyen, banks), carriers, pickup points, parcel tracking: every integration has its own API, webhooks and error cases that must be handled properly.

Stock and ERP synchronisation

Selling an out-of-stock product or re-entering orders by hand is expensive. Catalogue, stock, prices and orders must stay in sync with the ERP, the point-of-sale software or marketplaces.

Performance and search ranking

Slow page loads hurt conversion and Google rankings. Core Web Vitals, caching and image optimisation are ongoing technical topics.

Security and payment compliance

A store handles personal data and transactions. Fraud, compromised modules, data leaks and the PCI DSS requirements tied to payment demand strict security hygiene.

Technical debt in modules and themes

Unmaintained modules, hard-edited themes, outdated PHP versions: the store becomes hard to update and every change feels risky.

How we respond

Architecture ready for load

Application and HTTP caching, CDN, optimised database, scalable hosting and load testing ahead of key commercial periods.

Robust integrations

We build or harden payment, shipping and ERP connectors with error handling, queues, retries and logging, so every order ends up in the right place.

WooCommerce and PrestaShop expertise

Creation, redesign, migration and maintenance of stores on the two main e-commerce CMS platforms in the French market, with cleanly built modules when the standard is not enough.

Custom development when needed

For complex catalogues, product configurators or unusual sales models, we build custom platforms (Next.js, Spring Boot, Node.js) or targeted extensions.

Security and ongoing maintenance

Scheduled updates, tested backups, web application firewall, monitoring and fast troubleshooting when an incident occurs, so no store is left vulnerable.

Measured performance

Core Web Vitals audit, optimisation of the theme, SQL queries and media, then tracking over time rather than a one-off optimisation.

Typical projects

Building or redesigning a WooCommerce or PrestaShop store
Migrating a store to scalable cloud hosting
Integrating a payment provider and carriers
Synchronising catalogue, stock and orders with an ERP
Performance optimisation ahead of a sales period
Developing a custom module or product configurator
Cleaning and securing a hacked store
Custom B2B e-commerce platform with per-customer negotiated pricing

Frequently asked questions

WooCommerce, PrestaShop or custom: how do we choose?

WooCommerce suits simple catalogues attached to a WordPress content site. PrestaShop is more structured for large catalogues and varied sales rules. Custom development is justified when the sales model, catalogue or integrations go beyond what a CMS handles. We study your constraints before recommending an option.

Can you prepare our store for Black Friday?

Yes. We audit the infrastructure and code, set up caching and a CDN, run load tests and fix the bottlenecks we identify. It is best to start several weeks before the event.

Can you connect our store to our ERP?

Yes. We build connectors that synchronise products, stock, prices and orders, using the ERP's APIs or file exchanges when no API exists. Sync direction and frequency are defined with you.

What should we do if our store is hacked?

Contact us quickly. We isolate the store, identify the vulnerability, clean the code and database, restore from a clean backup if needed and harden security to prevent a repeat.

Do you work on stores built by another agency?

Yes. We start with a technical audit to understand the existing code, installed modules and hosting, then propose a suitable takeover or maintenance plan.

Tell us about your project

Describe your need in a few lines: we come back to you with a first analysis and the next steps.

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