David Jason

Shopify App Developer for Zigpoll

Oct 2024 - Present • 2 yrs

I handled the complete technical architecture and backend engineering for the Zigpoll shopify app, a specialized merchant tool designed for zero-party customer feedback collection and post-purchase conversion analytics. My core responsibility was building a resilient backend on Node.js and PostgreSQL capable of processing high-volume webhook events without latency. During peak commercial events including Black Friday and Cyber Monday, the application ingested over 1.2 million survey responses per month while maintaining a 99.99% server availability record. I deployed the worker services across AWS Lambda and utilized Redis for real-time session caching and rate-limiting queue management. On the frontend, I engineered an embedded merchant dashboard using React, Shopify Polaris, and App Bridge. This gave store owners a native interface inside Shopify Admin, reducing user drop-off and lifting merchant onboarding completion rates by 24%. I integrated the Shopify GraphQL Admin API to fetch customer metafields, line items, and fulfillment states with minimal payload overhead. To handle monetization, I wrote custom integration logic for the Shopify Recurring Application Charge API, managing tiered subscription plans, 14-day free trials, and automatic usage-based billing webhooks. I also handled all mandatory compliance requirements for the official Shopify App Store review, including GDPR mandatory webhooks (customers/data_request, shop/redact), strict Content Security Policies (CSP), and HMAC signature verification. The app passed Shopify's technical review on the first submission and maintains a 4.9-star rating. Tools used: Shopify CLI, GraphQL Admin API, Node.js, Express, PostgreSQL, Redis, React, Shopify Polaris, App Bridge, AWS Lambda, Docker. Check my portfolio for the full project case study or contact me to discuss your needs.

Peptide Website Builder for Apex Bio

Jan 2024 - Sep 2024 • 8 mos

I engineered the full digital infrastructure and compliance architecture for the Apex Bioresearch peptide website, an online e-commerce platform distributing high-purity laboratory research chemicals and peptides across North America and Europe. Given the strict regulatory landscape surrounding research compounds, standard off-the-shelf themes were inadequate. I built a custom, lightweight WooCommerce architecture on WordPress, stripping out render-blocking scripts to achieve a 1.2-second average mobile page load speed. I coded an automated, cookie-based 21+ age verification modal and implemented mandatory legal checkout gating where buyers must confirm "Research Use Only (RUO)" terms before initiating a transaction. To establish scientific trust and solve a major customer friction point, I built a dynamic Certificate of Analysis (COA) batch-lookup system. Customers can input specific lot numbers on product pages to instantly view and download third-party HPLC and Mass Spectrometry PDF reports via an integrated viewer. On the payment processing side, research peptides face high merchant processor scrutiny. I integrated a multi-tiered payment architecture using Authorize.net CIM, an NMI gateway, and an automated cryptocurrency checkout fallback powered by BTCPayServer. This eliminated payment gateway shutdowns and dropped checkout abandonment by 34%. For server performance and security, I configured Redis object caching, custom MySQL indexing for high-variant compound SKUs, and implemented strict Cloudflare Web Application Firewall (WAF) rate-limiting rules to shield against bot scraping. The completed store processed over $85,000 in monthly transactions within 90 days of launch. Tools used: WooCommerce, WordPress, PHP, MySQL, Authorize.net, NMI, Cloudflare WAF, Redis, JavaScript, CSS3. Check my portfolio for the full project case study or contact me to discuss your needs.