Good fit
Shopify stores that need reliable help: theme fixes, apps, checkout and customer flows, performance, or ongoing support from someone who stays close after launch.
Shopify engineering, end to end: apps, storefronts, Liquid, and performance.
Eugene Shcherbakov · Helsinki
I ship Shopify apps, theme work, and storefront fixes that hold up under real traffic. Hundreds of live stores taught me what breaks after launch, so you get fewer surprises.
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Built for store owners who need Shopify help that holds up.
Plain outcomes, clear scope, and work that still makes sense after launch. Not a tech resume.
What I fix
- Broken or unreliable checkout
- Slow product and collection pages
- Messy theme customizations that keep breaking
- Apps that do not talk to your store the way they should
- Subscription, claims, and other custom customer flows
How a project usually goes
01
Review the store and the job
I look at what is actually broken, what has been patched before, and what success looks like for your store.
02
Agree on clear scope
You get a tight plan, timing, and what is in or out before any code starts. No surprise scope creep.
03
Ship and leave it maintainable
The fix goes live on the real store, with plain updates and work someone else can still read later.
Good fit / not a fit
Not a fit
Generic WordPress or non-Shopify sites, and pure design-only projects with no engineering work. If it is not Shopify, I am probably not the right hire.
Proof in practice
More case studies →BJAF
bjaf.com ↗Shopify Plus multi-market rebuild
- Problem
- BJAF needed a Shopify Plus rebuild that could sell across multiple regions and languages from one catalog.
- What changed
- Rebuilt bjaf.com from Figma into a Liquid theme with a custom admin app, Judge.me reviews, product video reels, and Shopify Markets.
- Result
- One theme now serves multiple markets and languages instead of duplicate storefronts.
Totteland
totteland.dk ↗Promotions and subscription shipping
- Problem
- On totteland.dk and bjaf.com, a Buy X Get Y code was being abused, a subscription free-shipping rule dropped gift lines, and mobile nav broke behind a popup.
- What changed
- Rebuilt the promotion, fixed the shipping profile conflict, and traced the mobile nav bug to a cookie-banner clash.
- Result
- Discounts, subscriptions, and mobile browsing worked the way the merchant set them up.
Sloten Specialist
Cylinder product configurator
- Problem
- Sloten Specialist's lock cylinder line had more valid combinations than Shopify's three variant options allow.
- What changed
- Built a storefront configurator with admin-editable rules so only valid combinations can reach the cart.
- Result
- Customers configure complex cylinders on the product page without breaking checkout or inventory.
{% section 'reviews' %}
What clients say on Upwork
Real 5.0 reviews from Shopify clients. Verify them on my Upwork profile.
- 5.0
“Eugene is a very talented developer and did a great job on our Shopify API integration. We hope to work with him again in the future.”
Shopify developer to send orders to warehouse via API
Fixed price
- 5.0
“Eugene is, simply exceptional. From his precision and work ethic to his extensive knowledge of website integrations and Shopify development, he consistently delivers outstanding results. He is a clear communicator.”
Shopify Integration Developer Needed
Fixed price
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Production systems, not side projects.
2025 - now
Upnova · Full Stack Engineer · Shopify
Shopify upsell app · $1M+ ARR · 600+ merchants · $40M+ merchant revenue
I work across the full Shopify product: app features, storefront integrations, custom Liquid templates, and AI-powered merchant tooling across hundreds of live stores. I've contributed to the migration from Builder.io onto our own React infrastructure, and I debug INP regressions across diverse theme setups.
- Shopify APIs
- Liquid
- App Bridge
- React
- TypeScript
- Node.js
- GraphQL
- Gadget.dev
- Tailwind
2024 - 2025
Shook Digital · Full Stack Engineer
TikTok-partner video SaaS · #1 fastest-growing startup in Finland (Sifted, 2024)
I joined early and helped grow the product into the #1 fastest-growing startup in Finland. I built web-based video editor features with a focus on performance, scalability, and bulk editing workflows, and sat in on customer calls to shape where the product went next.
- TypeScript
- React
- GraphQL
- PostgreSQL
2023
UpWash · Full Stack Engineer
Fleet Management SaaS · MVP in 3 months
I took Fleety, a fleet-management platform, from concept to working MVP in three months, solo. Backend, frontend, brand identity, and a Telegram integration for real-time fleet notifications. All of it was mine to get right.
- Node.js
- Express.js
- JavaScript
- Telegram API
2021 - 2023
BotBrains · Founder & Developer
Founded at 17 · Featured on the MetaTrader (MQL5) website
My first company, started at 17. A no-code visual editor that generates MQL5 trading-robot code, deployable straight to MetaTrader 5. Built entirely by me, and eventually featured on the official MetaTrader website.
- PHP
- JavaScript
- MQL5
{% section 'featured-project' %}
BotBrains
2021 - 2023
No-code platform for creating algorithmic trading robots. Built entirely solo. A visual editor generates MQL5 code deployable to MetaTrader 5. Featured on the official MetaTrader (MQL5) website.
read the feature on mql5.com
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I started a company at 17 (BotBrains, a no-code editor that generates trading-bot code, featured on the official MetaTrader site), then spent the next years shipping SaaS: a fleet-management MVP in 3 months, a video editor at the fastest-growing startup in Finland, and now Shopify products at Upnova.
My opinion after several years of this: most engineering effort is wasted on work that demos well and dies in production. Diverse merchant themes, slow devices, and real traffic are the actual test suite. That's the work I like, and the work I'm good at.
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Happy to talk Shopify SaaS.
Architecture, app development, storefront performance, and growth. If you're building on Shopify, let's talk.