Development

Website upgrades and custom modules, done clean and fast

New feature, custom plugin, bug fix, or a full build-out. I work with WordPress, Shopify, Tilda, Webflow, OpenCart, and clean custom code. No agency overhead and no unnecessary dependencies.

<0.5s
load time
A+
security
24/7
monitoring
Message me on Telegram Describe the task →
from 2 days
delivery timeline
6+
platforms
24h
task estimate
✓ Done in 4 days
⚡ 90+ PageSpeed
🔒 0 unnecessary plugins
custom-filter.php ● writing...
1 <?php
2 // Custom WooCommerce product filter
3 add_filter( 'woocommerce_product_query',
4 function( $q ) {
5 $meta = $q->get('meta_query');
6 $meta[] = [
7 'key' => '_delivery_zone',
8 'value' => get_query_var('zone')
9 ];
10 $q->set('meta_query', $meta);
11 }
12 );
PHP WooCommerce 8.x typing...
99.9%
Uptime
<0.5s
load time
A+
security
24/7
monitoring
from 2 days
delivery timeline
6+
platforms
90+
PageSpeed after
14
days warranty
Problem

Why technical issues hold the business back

🫥

The previous developer disappeared

A freelancer built the site and vanished. Now you need a change, but there are no credentials, no documentation, and nobody knows how the system actually works.

Result: the site becomes hostage to one contractor
🪲

Small bugs stay unresolved for weeks

The form fails on mobile, a button does not work in Safari, or the price shows incorrectly. Every bug costs you real leads.

Result: daily customer loss caused by “small” issues
💥

The site breaks after an update

WordPress or a plugin gets updated and the page goes blank. There is no backup, no staging, and the site stays down for hours.

Result: every update becomes a business risk

A freelancer built the site and vanished. Now you need a change, but there are no credentials, no documentation, and nobody knows how the system actually works.

→ the site becomes hostage to one contractor
WHO IT IS FOR

When you need improvements, not a brand-new site

🏢

Businesses with an existing website

You need a new feature or a bug fix without rebuilding the whole site and without hiring an in-house developer.

🛒

E-commerce owners

Custom filters, Nova Poshta or 1C integrations, and speed improvements that raise conversion without a full redesign.

🚀

Startups and MVPs

You need one specific feature, like a calculator, client portal, or custom form, delivered fast and without bloated code.

PLATFORMS

What I can build for your site

Click a card to learn more ↻

WordPress

— most popular
CPT + ACF Pro Custom plugins Child theme WooCommerce Hooks and filters REST API
details

Shopify

LiquidCustom appsMetafieldsShopify API
details

Tilda / Webflow

Zero Block JSWebflow CMSInteractionsForms
details

OpenCart

ModulesNova PoshtaRozetka XML
details

HTML / JS

Custom JSGSAPBug fix
details

Speed optimization

Core Web Vitals PageSpeed 90+ Lazy load CDN & caching Cross-browser
90+
details

WordPress

most requested area
✕

Custom themes and plugins built from scratch, or extension work on existing websites. From landing pages to large WooCommerce e-commerce projects.

  • Custom post types + ACF Pro fields
  • Integrations with CRM and payment systems
  • WooCommerce stores end to end
  • REST API for mobile apps and SPAs
  • Migration from other platforms without losing SEO

Shopify

✕

Shopify store customization, from design changes to private apps and order automation.

  • Liquid template customization
  • Private apps and integrations
  • Metafields for SEO and filtering
  • Order and inventory automation

Tilda / Webflow

✕

Advanced animation and non-standard front-end work inside builders, plus custom JS and CRM-connected forms.

  • Advanced animation in Zero Block
  • Custom JS for interactivity
  • CMS collections + dynamic content
  • Forms with CRM integrations

OpenCart

✕

Integrations with marketplaces and delivery services, plus XML feeds and custom modules for the Ukrainian market.

  • Shipping and payment modules
  • Nova Poshta: pickup points + tracking
  • XML feeds for Rozetka, Prom, and Hotline
  • Custom extensions built for the use case

HTML / JS

✕

Animations, interactivity, bug fixing, and optimization on any stack, with or without a CMS.

  • Animations and interactivity (GSAP, ScrollTrigger)
  • Bug fixing on any stack
  • Code optimization and refactoring
  • Any CMS or static website

Speed optimization

✕

Full audit and optimization, with a PageSpeed 90+ guarantee or your payment back.

  • Core Web Vitals optimization for LCP, FID, and CLS
  • Image optimization + lazy loading
  • CDN, caching, minification
  • Cross-browser testing
  • Speed monitoring after launch
Process

How the work is structured

1
Brief and estimate
Technical brief plus an estimate of complexity and timeline.
📅 1 day
2
Alignment
Agreement on the approach, stack, and development stages.
📅 1 day
3
Implementation
Development with interim demos and feedback along the way.
📅 2-7 days
4
Delivery
Testing, documentation, deployment, and support.
📅 1-2 days
COMMON REQUESTS

When people usually come to me

Choose your situation and I will show what I would do

TOOLS

Technologies I work with

Platforms
🌐
WordPress
Themes, plugins, ACF, WooCommerce
🛒
Shopify
Liquid, custom sections, API
⚡
Tilda / Webflow
Custom code, integrations
Frontend
💻
HTML / JS / PHP
Clean code without frameworks
🔌
REST API
Integrations, webhooks, CRM
Infrastructure
📊
GA4 / GTM
Analytics, events, conversions
🚀
PageSpeed
Speed optimization
🛠
Git / SSH
Versioning, deployment

Technologies I work with

Platforms
  • WordPress CMS
  • Shopify E-commerce
  • Tilda / Webflow No-code
Frontend
  • HTML / JS / PHP Code
  • REST API API
Infrastructure
  • GA4 / GTM Analytics
  • PageSpeed Speed
  • Git / SSH DevOps
Case Study e-commerce · GA4

What was done

PHP handler for `woocommerce_thankyou`. JS capture of `client_id` and `session_id`. Server-side GA4 Measurement Protocol. 100% purchase tracking without losses from ad blockers.

+40%
recovered conversions
100%
attribution
100%
purchase tracking
SS
server-side GA4
Process
PHP handler woocommerce_thankyou
Server-side Measurement Protocol
100% purchase tracking
Full case study →
Real case study
W
Online store, WooCommerce
e-commerce · GA4
AUDIT
PHP handler woocommerce_thankyou
DEVELOPMENT
Server-side Measurement Protocol
RESULT
100% purchase tracking
+40%
recovered conversions
100%
attribution
100%
purchase tracking
SS
server-side GA4
👆 tap for case details
What was done
PHP handler for `woocommerce_thankyou`. JS capture of `client_id` and `session_id`. Server-side GA4 Measurement Protocol. 100% purchase tracking without losses from ad blockers.
Full case study →
👆 tap to go back
Pricing

What website upgrades cost

Final pricing comes after reviewing your exact technical brief

MINI TASK
from $80
1-2 days · up to 3 hours of work
  • Bug fix or small change
  • CSS/JS customization
  • One specific feature
  • Delivery with code comments
Describe your project →
MOST POPULAR
STANDARD MODULE
from $250
3-7 days · full feature build
  • Custom plugin or module
  • WooCommerce / Shopify extension
  • API integration or webhook
  • Testing + documentation
  • 14 days of support after delivery
Discuss Project →
LARGE PROJECT
from $550
1-3 weeks · complex build
  • Complex custom plugin
  • Multi-platform integration
  • Client portal / dashboard
  • Full testing + QA
  • 30 days of support after delivery
Discuss →
MOST POPULAR
STANDARD MODULE
from $250
3-7 days · full feature build
  • Custom plugin or module
  • WooCommerce / Shopify extension
  • API integration or webhook
  • Testing + documentation
  • 14 days of support after delivery
Discuss Project →
Related services

Works better together

🌐
Websites
WordPress, Shopify, Webflow: turnkey builds
→
🔗
Integrations
CRM, API, and automated data exchange
→
📈
GA4 & GTM
Conversion tracking, pixel, Looker Studio
→
Anastasia Kyslenko — Ad Astra Marketing

Who works on your project

I am Anastasiia Kislenko. Not an agency, not a team of interns. You work directly with me, from strategy to reporting. No middle managers and no handoff of key work to juniors.

6+ years of experience 120+ clients 5 markets (UA, DE, PL, UK, US)
Anastasia Kyslenko — Ad Astra Marketing
Anastasia Kyslenko
● online now

Hi! I am not an agency or a team of interns. You work directly with me, from strategy to reporting. No middle managers and no handoff of key work to juniors.

now
6+
years
120+
clients
5
markets
Message me on Telegram
Testimonials

What clients say

★★★★★

After launching the Google Ads campaigns, the number of leads tripled in the first month. Anastasiia set up the audiences and keywords precisely, so the budget works efficiently without waste.

I
Ihor Savchenko
Director, logistics company
★★★★★

We ordered a redesign of our corporate website, and the result exceeded expectations. Modern, fast, and easy to use on mobile. Clients themselves keep noting that working with us now feels much more professional.

O
Oksana Lytvyn
Marketing Manager, IT company
★★★★★

I am very grateful for the communication. Always reachable, always explaining every step. In 3 months we moved the site into Google’s top 5 for our key queries. I recommend her to anyone who wants results.

M
Maryna Kovalenko
Beauty studio owner, Lviv
★★★★★

"After launching the Google Ads campaigns, the number of leads tripled in the first month. Anastasiia set up the audiences and keywords precisely, so the budget works efficiently without waste."

I
Ihor Savchenko
Director, logistics company
★★★★★

"We ordered a redesign of our corporate website, and the result exceeded expectations. Modern, fast, and easy to use on mobile. Clients themselves keep noting that working with us now feels much more professional."

O
Oksana Lytvyn
Marketing Manager, IT company
★★★★★

"I am very grateful for the communication. Always reachable, always explaining every step. In 3 months we moved the site into Google’s top 5 for our key queries. I recommend her to anyone who wants results."

M
Maryna Kovalenko
Beauty studio owner, Lviv
FAQ

FAQ

What is the minimum scope of work?

Starting from 2-3 hours of work. Small tasks can be bundled together, for example five fixes under one price. Send the scope and we will sort it out.

How long does the estimate take?

Up to 24 hours after I get access or the brief. For simpler tasks, usually much faster, often within 2-3 working hours.

Have you worked with my kind of site before?

Most likely yes. WordPress, Shopify, Tilda, Webflow, OpenCart, and custom HTML/PHP are all familiar territory. If your platform is not on the list, send it over and I will tell you honestly.

Do you leave the access after the job is done?

Yes. All access stays with you. I do not keep passwords. I also hand over documentation and code comments for what was built.

What if something breaks after delivery?

Warranty support is included: 14 days for the Standard package and 30 days for the Large Project. If a bug was caused by my code, I fix it at no charge.

Get started

Describe the task,
and I will estimate it within 24 hours

Fill out the form or message me on Telegram. If you can, provide temporary access to the site so the estimate can be more accurate.

Message me on Telegram
  • Free task estimate within 24 hours
  • NDA on request, and all access stays with you
  • Fixed timeline and price, no surprises
I will reply within 24 hours