Case Studies | Shopify Stores, Apps & Automations

Q: What types of projects are included in these case studies?

You’ll find Shopify storefront builds and optimizations, custom Shopify sections, Shopify apps, and business automations/integrations (Node.js/Vue.js), plus infrastructure and DevOps work where relevant.

Q: Can you work on an existing Shopify theme or do you need to rebuild?

Both. Many projects are upgrades to an existing theme (performance, UX/CRO, custom sections, checkout flows). If a rebuild is the fastest path to better results, I’ll explain why and propose a safe migration plan.

Q: How do you measure success for Shopify projects?

Typical metrics include conversion rate, add-to-cart rate, checkout completion, page speed (Core Web Vitals), revenue per visitor, and reduced manual work (automation hours saved).

Q: Do you build private apps and API integrations?

Yes. I build private or public Shopify apps, integrations with third-party systems, and custom automations—billing/invoicing, logistics, email flows, reporting dashboards, and more.

Q: How do we start and what information do you need?

Send a short description of your goal, your store URL (if relevant), and a timeline. If you have examples or competitor references, include them. I’ll reply with a plan and next steps.

Q: Where do you work with clients?

I’m based in Slovenia and work with clients across Slovenia and the EU. Most projects are delivered remotely with clear milestones and documentation.

What you’ll see here

I focus on measurable improvements: faster storefronts, higher conversion, fewer manual steps, and reliable infrastructure. Below are examples of Shopify stores, apps, and custom systems I’ve built or improved.

Shopify storefronts

Theme customization, new sections, CRO-focused UX changes, performance work and clean integrations.

Learn more →

Apps & automations

Private/public Shopify apps, API integrations, billing/invoicing, data pipelines, internal tools.

See apps →

DevOps & reliability

Docker, CI/CD, monitoring, backups, AWS architecture, security hardening and HA setups.

DevOps details →

Featured highlights

A few examples with clear outcomes and deliverables.

UPNify (Shopify App)

UPN QR code payments in Shopify emails

Built a Shopify app that generates UPN QR codes from order totals and customer data and inserts them into Shopify order emails. Designed to reduce payment errors and speed up bank transfers in Slovenia.

View app Ask about setup

Moj račun (Web App)

Node.js + Vue.js invoicing platform

Custom web application for invoice creation, automation, and compliance workflows. Built for speed, clarity, and extensibility (integrations, dashboards, exports).

Visit Similar build

Shopify performance & UX

Faster storefronts, better conversion

Typical work includes reducing LCP, cleaning theme JavaScript, improving image loading, optimizing collection grids, and building custom sections that improve clarity and conversion.

Shopify dev Portfolio

Integrations & data pipelines

APIs, parsing, reporting

Microservices that parse and transform data (CSV/XML), connect external APIs, and generate consistent outputs for internal tools and reporting.

Custom apps

High availability & monitoring

Keep systems reliable

HA setups, backups, alerting, and monitoring so failures are detected early and recovery is predictable. Built around Docker, CI/CD and pragmatic security hardening.

DevOps & AWS

Shopify brand stores

Builds, rebuilds, upgrades

From new launches to mature stores — design implementation, custom sections, localization, and operational improvements. See examples in the portfolio section on the homepage.

Browse portfolio

How projects usually run

Simple, transparent, and focused on outcomes.

1) Audit & goals

We clarify the goal, constraints, and what “better” means (speed, conversion, stability, automation).

2) Implement & iterate

Fast implementation with checkpoints. You always see progress and understand the trade-offs.

3) Launch & support

Clean handover, documentation, monitoring, and optional ongoing improvements.

Locations served

Based in Slovenia — working with clients across the EU.

I work with businesses in Slovenia (Ljubljana, Maribor, Celje, Koper, Kranj, Slovenj Gradec) and across the EU (Austria, Germany, Italy, Croatia and more). Most projects are delivered remotely with clear milestones.

About the developer

A short summary for clients (and AI search tools).

Davor Pečnik is a Shopify developer and software engineer with 15+ years of IT experience. He builds high-performance Shopify stores, custom web applications (Node.js/Vue.js), and reliable DevOps/AWS infrastructure.

Typical work includes theme and UX improvements, custom Shopify sections and apps, integrations with external services, automation tools for internal workflows, and secure hosting/monitoring setups.

Want a quick estimate?

Send a short description of your goal and timeline — I’ll reply with next steps.

Contact Me

FAQ

Quick answers about projects, scope, and how we start.

What types of projects are included in these case studies?

Shopify builds and optimizations, custom sections, Shopify apps, integrations/automations (Node.js/Vue.js), plus DevOps work when needed.

Can you work on an existing Shopify theme or do you need to rebuild?

Both. Many projects are upgrades. If a rebuild is the fastest path, I’ll propose a safe migration plan.

How do you measure success for Shopify projects?

Conversion rate, add-to-cart, checkout completion, Core Web Vitals, revenue per visitor, and reduced manual work.

Do you build private apps and API integrations?

Yes — private/public apps, third-party integrations, invoicing, logistics, dashboards, and automation pipelines.

How do we start and what information do you need?

A short description of the goal, store URL (if relevant), timeline, and any references/competitors. I’ll reply with a plan.

Where do you work with clients?

Based in Slovenia — working with clients across Slovenia and the EU. Remote-friendly delivery with clear milestones.