Custom OpenCart development & plugins
OST's largest e-commerce channel. 12+ OpenCart engagements including custom builds, custom plugins, and OpenCart 2.x to 4.x migrations. Pattern from Bango Systems, Tenelo, accept.blue, and Future-CAM.
E-commerce · OpenCart · Magento · Marketplaces
Software for the stores that have outgrown their starter platform.
Custom OpenCart engineering, custom payment integrations, multi-channel inventory and order management, and ongoing SEO partnership. Built for retailers who need engineering depth, not another templated theme.
What we build
Services for e-commerce platforms and operations.
Custom engineering, integration plumbing, and ongoing support scoped to the operational reality of e-commerce businesses.
Custom payment integration
Bespoke payment plugins where the off-the-shelf gateway does not fit your workflow. Tokenization, vault integration, payment-flow customization. Pattern from the Fire Mountain Solar custom payment plugin.
Multi-channel inventory & order management
Sync stock and orders across your storefront, Amazon, marketplaces, and POS. Real-time inventory reconciliation, dedup logic, and the integration plumbing to stop overselling.
PCI-scoped checkout flows
Tokenization and vault integration to route through PCI-compliant processors and minimize cardholder data scope on your own infrastructure. Stripe, PayPal, Authorize.Net, Square, and custom processors.
ADA accessibility audits & remediation
WCAG 2.2 AA conformance for e-commerce sites. Pre-emptive scope, not post-letter triage. Color contrast, semantic markup, keyboard navigation, screen reader support, and category-page accessibility.
SEO & Core Web Vitals
Performance, structured data, schema markup, and organic visibility for product and category pages. Pattern from the Fire Mountain Solar ongoing SEO engagement.
AI assistants for product discovery & support
Conversational product discovery, AI-powered FAQ, and customer service automation. Live AI assistant pilots in production for active retailers. Configurable per category, language, and policy.
Mobile commerce apps
iOS, Android, and cross-platform commerce apps. Native checkout, push notifications, saved carts, and delivery tracking. Built for retailers whose buyers complete a meaningful share of purchases on mobile.
Migration & modernization
Magento 1 end-of-life moves, OpenCart 2.x to 4.x, custom legacy carts, and platform replatforming. Done without breaking the catalog, the SEO, or the orders in flight.
Featured engagement
A custom commerce build, a custom payment plugin, and SEO under one roof.
Fire Mountain Solar is one of OST's anchor e-commerce engagements. Custom commerce platform, a payment plugin we engineered for their specific workflow, and continuous SEO partnership across the storefront. Clutch verified.
Solar e-commerce · custom commerce + payment plugin + SEO
Custom commerce platform tuned to the solar industry's unit economics and category structure. A custom payment plugin engineered for their specific approval flow. Continuous SEO engineering across product structure, content architecture, and Core Web Vitals. One team, one source of truth across all three.
3 disciplines: build, plugin, SEO
1 team across the stack
Clutch verified public reference
Other e-commerce clients
Clients in this practice we have shipped for.
A selection of e-commerce and OpenCart clients beyond the featured engagement above. OST's largest vertical by client count. Full named-reference list available to qualified prospects under mutual NDA.
29+
Active e-commerce and OpenCart clients (OST's largest vertical by count)
12+
OpenCart custom builds and custom plugins shipped
AI chatbot
Pilot live in production for an active retailer
PCI + ADA
Compliance scoped on every checkout-handling engagement
E-commerce-sector compliance
Frameworks e-commerce clients ask about.
Compliance we have experience implementing on e-commerce engagements. Specific compliance is scoped per contract based on what your platform handles, where your buyers are, and what categories you sell. See the Trust Center for the broader posture.
E-commerce compliance is integration-specific. PCI DSS scope depends on whether your platform stores or processes card data directly; we route through compliant processors to minimize that scope on your own infrastructure. Sales tax and category-specific compliance vary by state, country, and product category.
PCI DSS
Scoped per integration. We route through PCI-compliant processors (Stripe, PayPal, Authorize.Net, Square, custom) to minimize cardholder data scope on your own infrastructure. Tokenization and vault integration as standard.
WCAG 2.2 AA + Section 508
ADA accessibility for e-commerce. The most-sued vertical for digital accessibility. We design for conformance pre-emptively rather than triage after a demand letter.
CCPA / CPRA + state privacy laws
California buyer PII, opt-out, right-to-know, right-to-delete. Other state laws (Virginia, Colorado, Connecticut, Utah) picked up where applicable.
GDPR for international buyers
Opt-in consent, cookie compliance, right-to-delete, and data subject access request workflows for stores selling into the EU and UK.
Sales tax automation
Avalara, TaxJar, and platform-native tax engines integrated and scoped per state nexus rules. Cross-border VAT, GST, and tax registration workflows when applicable.
Category-specific compliance
FDA-regulated supplements, FTC advertising rules, age-gating for alcohol and tobacco, state-by-state restrictions for regulated categories. Scoped per the categories your platform sells.
Building or scaling an e-commerce platform?
60-minute discovery call. We will walk through your stack, channel sprawl, custom plugin needs, PCI scope, and what one-stop-shop e-commerce engineering actually looks like.