Mario Colic
Full Stack Developer
I build production apps in the Shopify ecosystem at Shop Circle — from storefront to infrastructure. Focused on shipping fast, scalable software that merchants rely on daily.
Releasit Bundles & Upsells
- Designed, architected and shipped solo in under 6 weeks
- Part of Releasit — apps trusted by 150k+ Shopify merchants
- React · Remix · TypeScript · GraphQL · Prisma
Passionate about building things that matter
I'm a full stack developer at Shop Circle on the Releasit Apps team. I build and maintain production Shopify applications end-to-end — from the storefront experience to the backend infrastructure. I care about writing clean, maintainable code and shipping products that solve real problems for real people.
When I'm not coding, you'll find me gaming, binge-watching something on Netflix, or just vibing.
Full Stack Development
Building performant web applications across the entire stack.
Shopify Ecosystem
Deep expertise in Shopify app development and storefront customization.
Infrastructure
Designing and managing scalable data layers and cloud services.
Development Experience
Shop Circle
Releasit AppsBuilding and maintaining production Shopify apps serving 150k+ merchants worldwide. Working across the full stack — from React frontends to backend infrastructure — shipping features, resolving complex bugs, and owning entire app lifecycles.
Shop Circle
Releasit AppsSpecialized in customizing Shopify apps to meet merchant needs using JavaScript and CSS. Leveraged deep knowledge of in-app features and Shopify's data flow to deliver tailored solutions and optimize user experiences.
Technologies I Work With
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Things I've Worked On
From Shopify apps to full-stack platforms — a selection of my work
Professional Work
Releasit COD Form & Upsells
1-Click Cash on Delivery order form with pre/post-purchase upsells, downsells, and quantity offers to boost conversion and AOV. Features OTP phone verification, A/B testing, multi-currency support, and event tracking across Facebook, TikTok, Google, Pinterest & Snapchat. Built as part of the Releasit team at Shop Circle.
Releasit COD Fee & Verify
Set COD fees, discounts, and conditional rules by country, product, or order value. Verify orders with WhatsApp OTP to block fake checkouts and reduce RTO. Collect partial COD payments upfront with full payment tracking and balance visibility. Built as part of the Releasit team at Shop Circle.
Releasit Bundles & Upsells
Product bundling app with quantity offers, related product upsells, cross-sells, and custom discount strategies to increase AOV. Led the design, architecture, and build from scratch as part of the Releasit team at Shop Circle — with analytics, A/B testing, and highest-level Shopify compliancy.
Notable Side Projects
WoW 3.3.5a PVP Addon
All-in-one PVP addon for World of Warcraft 3.3.5a, built out of frustration after 15 years of running 20 separate addons just to play the game I love. Replaces my entire combat UI: custom unitframes (player, target, focus, arena), spell castbars with enemy cast tracking, cooldown timers for self and opponents, and diminishing-returns / CC tracking. Written in Lua on the Ace3 framework with XML UI definitions.
Live link will follow once the addon is fully released.
Mini Shop
Multi-tenant e-commerce platform inspired by Shopify — built from scratch to deeply understand how Shopify works under the hood. Full ecosystem including storefront rendering, tenant isolation, database architecture, logging, and error monitoring.
Preview is not available.
Shopify Debug Extensions
Chrome extensions built to enhance our support team's workflow — live storefront debugging, app diagnostics, and automated code changes directly from the browser.
Preview is not available.
Discord Automation Bot
Discord bot with admin controls, scheduled messaging, game API integrations, and automated response systems. Hosted 24/7 via Railway.
Let's Build Something Together
Got a project in mind, want to collaborate, or just want to say hi? I'm always open to new opportunities and interesting conversations.