Shopify development for the way your store works.

Custom apps, theme features and integrations for stores that have outgrown an off-the-shelf setup. Bring a defined feature, a broken workflow or an existing app that needs an engineer.

Describe your task How to start Focused Fix · from USD 450

Sounds familiar?

What I build for Shopify stores

Shopify in AI Shopping Channels: Found, Bought, Counted

Selected work

A look at the work

On Daniil’s portfolio

Client implementation
Custom shipping rules
A Shopify app for shipping prices and conditions that depend on the products in the cart.
Client implementation
Collection availability scheduler
Date-based product availability for seasonal collections, with a record of each scheduling run.
Own platform · in production
DeploTeka
A platform I designed and built for running one dedicated Shopify app per client store.
Internal tool
Shopify performance toolkit
Repeatable storefront diagnostics with AI-assisted analysis and a controlled path to theme changes.

Delivered work

Google Ads Was Optimising for Free Screenings. Now It Knows Who Paid.
Telehealth physical-therapy practice · 2026-08
I sent paid Stripe subscriptions to Google Ads as offline conversions for a US telehealth practice and fixed identity lost by conversion tags.
Google Ads Was Optimising for Free Screenings. Now It Knows Who Paid.
The 97 That Was a Lie
Jewellery DTC · 2026-07
A UK jewellery store's PageSpeed score was faked for the benchmark. The honest score was 78; real optimisation reached 92 and LCP fell from 3.4s to 1.2s.
The 97 That Was a Lie
8.94 MB to 0.77 MB Without Delaying Tracking
Seafood store · 2026-08
I reduced an Irish seafood store’s homepage transfer by capping oversized image candidates. Tracking was kept outside the speed deferral work.
8.94 MB to 0.77 MB Without Delaying Tracking
Your Tracking Is Fine. Your Ad Isn't.
Coaching · 2026-06
An audit of a Spain-based coaching funnel separated an underperforming ad from a working Lead signal. I then built a client-owned Calendly-to-Meta server route.
Your Tracking Is Fine. Your Ad Isn't.
A Payment Provider Shopify Doesn’t Support: Finding a Working Path
Shopify commerce · Pilot backend documented live in September 2026; merchant acceptance unverified
I mapped 21 payment-integration experiments and built a server-verified payment continuation, with sandbox results separated from merchant acceptance.
A Payment Provider Shopify Doesn’t Support: Finding a Working Path

Situations in this area

All situations →

Custom Shopify apps, checkout & payments

Store launch, landings, catalog & speed

Client words

He continually checked in on how the conversion tracking was going days and even weeks after the project ended.
Brandon L., Function Fix2026
He’s probably the best freelancer I’ve worked with. He’s super responsive, incredibly knowledgeable, and always finds a solution to every problem.
Eleftheria K.2026
He went beyond the agreed work and supported me with additional items to ensure delivery was more outcome oriented rather than just what we had agreed.
Gagan M.2025
[He] made the perfect app for us and is brilliant to work with.
Upwork client, 20262026

How to start

A small change or a complete build.

Send your store URL, the current behaviour and the result you want. Discussing the task is free. A defined task goes straight to a fixed written quote; a larger build starts by agreeing the boundaries.

Estimate

Focused Fixfrom USD 450One bounded feature, repair or integration.
Custom Engineering Projectfrom USD 1,500An app, connected workflow or larger rebuild.

Describe your task