E-COMMERCE · CUSTOM PLATFORMS · MULTI-CHANNEL · MARKETPLACES
Custom e-commerce 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
Custom storefronts, custom plugins, multi-channel infrastructure, and the engineering depth retailers need when a templated theme stops being enough.
OST's largest vertical by client count. 29+ e-commerce engagements across Shopify, WooCommerce, Magento, OpenCart, and fully custom-built platforms. Custom plugins, third-party integrations, and platform-specific engineering across the stack.
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.
Sync stock and orders across your storefront, Amazon, marketplaces, and POS. Real-time inventory reconciliation, dedup logic, and the integration plumbing to stop overselling.
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.
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.
Performance, structured data, schema markup, and organic visibility for product and category pages. Pattern from the Fire Mountain Solar ongoing SEO engagement.
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.
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.
Magento 1 end-of-life moves, legacy custom carts, and full platform replatforming to Shopify, WooCommerce, or a modern custom stack. Done without breaking the catalog, the SEO, or the orders in flight.
Featured engagement
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.
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.
Other e-commerce clients
A selection of e-commerce clients beyond the featured engagement above. OST's largest vertical by client count. Full named-reference list available to qualified prospects under mutual NDA.
Active e-commerce clients across platforms — OST's largest vertical by count
Custom plugins and platform integrations shipped across engagements
Pilot live in production for an active retailer
Compliance scoped on every checkout-handling engagement
E-commerce-sector compliance
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.
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.
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.
California buyer PII, opt-out, right-to-know, right-to-delete. Other state laws (Virginia, Colorado, Connecticut, Utah) picked up where applicable.
Opt-in consent, cookie compliance, right-to-delete, and data subject access request workflows for stores selling into the EU and UK.
Avalara, TaxJar, and platform-native tax engines integrated and scoped per state nexus rules. Cross-border VAT, GST, and tax registration workflows when applicable.
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.
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.
