Hire the Best Payment Gateway Integration Specialists
in Ukraine

I help startups and growing businesses design, build, and scale 🚀 SaaS products, 🏪 marketplaces, 🛒 ecommerce platforms, 📱 mobile applications, and 💳 subscription-based businesses. With 10+ years of experience as a 💻 Full Stack Developer, 🏗️ Solution Architect, and 👨‍💼 Technical Lead, I deliver scalable products from MVP to production. My expertise covers SaaS development, marketplace platforms, subscription billing systems, payment infrastructure, API integrations, cloud-based applications, and business-critical payment flows. I don't just implement features — I help companies make technical decisions, define architecture, optimize billing processes, integrate payment systems, and launch products faster. ⚡ 🎯 Core Expertise ✅ Full Stack Development • ✅ SaaS Development • ✅ Marketplace Development • ✅ Ecommerce Development • ✅ Subscription Platforms • ✅ Subscription Billing • ✅ Payment Gateway Integration • ✅ Stripe Integration • ✅ PayPal Integration • ✅ Checkout Development • ✅ API Integration • ✅ Mobile App Development • ✅ React Development • ✅ Flutter Development • ✅ Firebase Development • ✅ Supabase Development • ✅ Technical Product Ownership • ✅ Solution Architecture 💳 Payment & Billing Expertise I specialize in building and optimizing payment systems for SaaS businesses, marketplaces, ecommerce stores, and mobile applications. 💰 Stripe Checkout • Stripe Elements • Stripe Payment Element • Stripe Billing • Stripe Subscriptions • Stripe Connect • Stripe Webhooks • Stripe Customer Portal • Stripe Payment Intents • Stripe Setup Intents • Stripe Invoicing • Stripe Tax • Stripe Payment Links • Stripe Radar • Stripe Identity • Stripe Connect Marketplace • Stripe Connect Payouts • Stripe Webhook Development • Stripe Webhook Troubleshooting • Stripe API Integration • Stripe Billing Automation • Stripe Subscription Management • Stripe Subscription Lifecycle Management • Stripe Checkout Optimization • Stripe Checkout Customization • Stripe Recurring Billing • Stripe SaaS Billing • Stripe Marketplace Payments • Stripe Vendor Payouts • Stripe Multi-Currency Payments • Stripe Upgrade & Downgrade Flows • Stripe Trial Management • Stripe Revenue Optimization • Stripe Fraud Prevention • Stripe Payment Security • Stripe Migration 💸 PayPal Integration • PayPal Checkout • PayPal API Integration • PayPal Subscriptions • PayPal Recurring Payments • PayPal Webhooks • PayPal Billing Agreements • PayPal Marketplace Payments 🔗 Payment Gateway Integration • Subscription Billing • Recurring Payments • Billing Automation • Customer Portal • Upgrade & Downgrade Flows • Trial Management • Multi-Currency Payments • Vendor Payouts • Marketplace Payments • Refund Automation • Payment Infrastructure 🚀 SaaS & Product Development I have extensive experience building SaaS platforms and subscription-based products. ☁️ SaaS MVP Development • SaaS Architecture • Multi-Tenant SaaS Applications • B2B SaaS Platforms • B2C SaaS Platforms • AI SaaS Products • SaaS Billing Systems • SaaS Payment Infrastructure • SaaS Subscription Management • SaaS Analytics & Reporting • SaaS Integrations • SaaS Scaling & Performance Optimization • SaaS Checkout Optimization • SaaS Revenue Optimization • Mobile SaaS Applications • SaaS Marketplace Platforms 🏪 Marketplace Expertise I help businesses build and scale marketplace platforms with automated payments and vendor management. 💳 Stripe Connect • Marketplace Payments • Vendor Payouts • Commission Systems • Multi-Vendor Platforms • Booking Platforms • Service Marketplaces • Product Marketplaces • Creator Platforms • Marketplace Billing Systems • Marketplace Checkout Flows • Marketplace Revenue Models 🧠 Technical Product Ownership I often work as a technical partner helping founders and business owners turn ideas into scalable products. 🏗️ Technical Product Ownership • Product Architecture Design • MVP Planning & Development • Startup Product Development • Technical Leadership • Solution Architecture • System Design • Product Roadmap Execution • Platform Scaling • Development Team Leadership • Business Requirements Analysis • Third-Party Integrations • Payment Infrastructure Design • SaaS Architecture Consulting 🛠️ Technologies Backend: PHP • Laravel • MySQL • Redis • Elasticsearch • Apache Solr Frontend: JavaScript • React • Vue.js Mobile: Flutter Backend as a Service: Firebase • Supabase Cloud & Infrastructure: AWS • S3 • CloudFront • Lambda • Docker 📈 Recent Project Experience 🚀 SaaS Billing & Subscription Platforms: Subscription Billing • Stripe Billing • Stripe Subscriptions • Checkout Optimization • Payment Gateway Integration • Recurring Billing • Subscription Lifecycle Management • Revenue Optimization 🏪 Marketplace Solutions: Stripe Connect • Marketplace Payments • Vendor Payouts • Commission Systems • Payment Infrastructure • Multi-Vendor Platforms 🛒 Ecommerce Platforms: Shopify Integrations • WooCommerce Integrations • Stripe Payments • PayPal Payments

✅ 50+ SaaS projects successfully completed, 14+ MVP done 2️⃣8️⃣ of them in the payments and fintech space - including PSP platforms, payment orchestration systems, hosted fields & checkout flows, and trading platforms for fintech clients. Hands-on integration experience with Stripe, Apple Pay, iDEAL, PayPal and other major payment gateways. 🏆 TOP RATED PLUS | In Top 3 Laravel Developer | Payment Systems Expert | AI-Powered SaaS Specialist | PHP Laravel Developer 💠 7+ Years Experience | Senior Architect specializing in scalable backend architecture and high-load PHP Laravel Developer ecosystems 💠 AI Strategist | Building AI-powered and AI-assisted workflows, integrating AI solutions for custom SaaS products and No-Code/Low-Code integrations 💠 Rapid MVP Delivery | From concept to production-ready launch in 4-6 weeks as a Full Stack Laravel Vue specialist 💠 Proven Track Record | 100% Job Success with 5-star feedback from enterprise and startup clients in the USA, Europe, and the UAE Hello to my future clients and collaborators! I'm Mike - a Senior Full Stack Laravel Vue Developer and Laravel Developer. As a Laravel consultant and Laravel expert specializing in AI-powered SaaS and Fintech, I build modern web applications combining powerful Laravel backend with clean Vue.js and React interfaces built with HTML5, CSS3, and Bootstrap. I also work with WordPress for content-driven platforms and Ruby on Rails for rapid application development. MY DEVELOPMENT JOURNEY Early in my career, I focused on mastering PHP, clean architecture, security and performance, and the Laravel ecosystem, including WordPress and Ruby on Rails projects. Today, as a PHP Laravel Developer, I lead complex projects using Laravel full stack, Vue, React, and Node-based APIs, delivering scalable and secure applications supporting real business growth. Whether it's a SaaS platform, admin panel, WordPress site, or integrating APIs-driven product, I work as a Laravel Developer who understands both business logic and technical scalability. All code is versioned with Git. WHAT I HELP WITH: 1️⃣. Laravel & Full Stack Web Development I'm a Full Stack Laravel Vue developer who builds everything from Laravel codebase to modern JavaScript interfaces, including WordPress themes and Ruby on Rails applications. As a PHP Laravel Developer and Laravel backend specialist, I specialize in: — Advanced Laravel development with Livewire, Filament, and Symfony — Frontend with Vue.js, React, Alpine.js, Tailwind CSS, Bootstrap, and CSS3 — WordPress custom themes, plugins, and CMS solutions — Ruby on Rails rapid application development — Clean architecture, security and performance-focused PHP — MySQL, PostgreSQL, MariaDB integration — Scalable backend architecture for long-term growth 2️⃣. RESTful & GraphQL API Development As a Laravel Developer and Laravel expert, I build robust backend API systems: — RESTful & GraphQL APIs with Laravel — Backend API and third-party services integrations for modern web applications — WebSockets for real-time Laravel platforms — Stripe integration, Firebase, Google Drive, integrating AI solutions via OpenAI API 3️⃣. SaaS Architecture As a Full Stack Laravel Vue developer, I design scalable and secure applications that scale: — Existing Laravel codebase modernization and extension — Multi-tenant architecture and multi-tenant SaaS dashboards — WordPress multisite and Ruby on Rails SaaS solutions — API-first architecture for React, Vue, and Node frontends 4️⃣. Performance & Code Quality As a Senior PHP Laravel Developer, I focus on: — Optimizing code for performance in Laravel and Ruby on Rails — MySQL and PostgreSQL database tuning — Frontend speed for React and Vue — WordPress performance optimization — Clean architecture, security and performance 5️⃣. Admin Panels & Back-Office Systems As a Laravel Developer, I build modern admin panels that help teams run operations smoothly with dashboards built with HTML5, CSS3, Bootstrap, and jQuery. I also deliver WordPress admin customizations and Ruby on Rails back-office solutions. I can help with: — Filament/Livewire admin panels with role-based access — Custom workflows, approvals, audit logs — PDF reports, analytics views, and operational dashboards 6️⃣. E-commerce, Payments & Subscription Systems If your business relies on payment gateway, subscription product, or checkout flows, I deliver as a Full Stack Laravel Vue expert who understands the full product lifecycle, including WordPress WooCommerce and Ruby on Rails e-commerce solutions: — Stripe integration, subscriptions, invoices, and webhooks in PHP Laravel Developer stack — Customer portals and secure checkout with HTML5 and CSS3 — Integrating APIs-first payment systems compatible with React and Vue With deep expertise in Laravel full stack development, I combine clean architecture, security and performance with modern AI-assisted workflows and backend API solutions to deliver scalable and secure applications.

I build fast, scalable, and pixel‑perfect WordPress websites powered by AI and delivering in days what used to take weeks, with performance, design precision, and automation at the core. My wide expertise, starting from UI/UX creation in Figma, to building fast, scalable WordPress websites with complex functionality. Two years ago this might have been an issue, since a specialist focused only on coding could often deliver faster. But now, with AI tools streamlining everything so significantly, my generalist experience and deap expertise become major advantage. I can now complete in a week what used to take a month for two people just a year ago. 🔑 Web Development Services I can offer: • A simple landing page or small informational WordPress website built from the ground up now takes just 2 days for a fully working version • A Woocommerce or Shopify website can be done in a week • Turning designs into custom Gutenberg blocks is now up to 5 times faster • Headless Wordpress with Next.js on the front end 🚀 Why Choose My Approach AI not only speeds up website development but also drastically improves quality and performance. There is no reason to use Elementor, Divi, WPBakery, or Beaver Builder anymore, they don’t streamline anything, build pages using them are slower than create and fill specific Gutenberg blocks both they slow down your website as well. There’s also no need to rely on plugins for job posting, directories, or pop ups that create a plugin mess and are hard to maintain - it’s simply faster to build with AI. Still, core solutions like WooCommerce, WPML, or ACF PRO bring a lot of value, and tools like Opus, Sonnet, or ChatGPT that are well trained to integrate them seamlessly. 🤖 AI Integration & Automation Besides that, I have extensive experience working with AI APIs and have already built several AI agents. For example, if you have a WooCommerce shop with many products, I can create an AI powered chat that helps users find relevant products, compare them, and pick the best option quickly — making their journey enjoyable and something they’ll want to repeat. Or maybe you run a web development agency and already have a dataset of pre built components? With an AI agent I develop, it would take just a few prompts to build a new, high quality site for your client. ✅ What You Get Pixel‑perfect UI/UX implementation Fast, scalable, SEO‑optimized websites AI‑driven automation for efficiency Clear communication and reliable support Let’s start working together in this new world powered by AI.

At Roobykon Software, I specialize in automating, scaling, and optimizing infrastructure and development workflows to help our clients achieve efficient, reliable software delivery. With over 10 years of hands-on experience as a Senior DevOps Specialist, I ensure robust integration and scalable operational environments for every project. Our team is dedicated to empowering companies to build and grow their marketplace businesses with cutting-edge DevOps solutions. 🏆 Area of expertise: • E-commerce (including multi-vendor marketplaces and product/service platforms) • FinTech (payment gateways, escrow systems, and custom financial solutions) • CRM Systems (tailored customer relationship management platforms) • Logistics (marketplaces for delivery, warehousing, and transportation) • Marketplace Development (B2B, B2C, peer-to-peer, product, service, and rental-based platforms using Sharetribe and custom-built solutions) • Travel and Tourism (booking platforms for accommodations, experiences, and tours) • Car Rent and Rental Websites (multi-vendor vehicle rental platforms) • Retail (multi-vendor e-commerce platforms, digital storefronts) • Construction and Real Estate (property listing marketplaces, contractor bidding platforms) • Aviation (charter services, private jet booking platforms) and boat rental (yacht, boats, jet ski) • Entertainment and Social Networking (event booking, ticketing, and social interaction platforms) • Marketing and Advertising (customized marketplaces for ad placements, influencer marketing platforms) • Insurance (platforms for comparing and purchasing insurance policies) • Industrial (B2B marketplaces for industrial goods and services) • Marketplaces for hospitality services, catering, and restaurant supplies • Mental Health and Healthcare (platforms for telemedicine, therapy services, healthcare provider listings) • Management (resource management platforms for HR, procurement, and project collaboration) Got an idea but unsure how to make it happen? We’ll provide tailored solutions to fit any budget and ensure everything is ready to go. With every project, we work as if it’s our own, always prioritizing your success. Buzzwords: Automation Continuous Integration Continuous Deployment (CI/CD) Infrastructure as Code (IaC) Microservices Orchestration Docker Kubernetes Monitoring Logging Containerization Scalability Load Balancing High Availability Disaster Recovery Fault Tolerance Infrastructure Automation Blue-Green Deployment Canary Deployment DevSecOps Secrets Management Immutable Infrastructure Jenkins Ansible Terraform GitOps Incident Management Rollback Auto-scaling EC2 S3 Lambda RDS Elastic Beanstalk CloudFormation ECS Fargate EKS Route 53 CloudWatch IAM SQS SNS CloudFront VPC Elastic Load Balancer (ELB) Redshift DynamoDB AWS Backup AWS CLI CloudTrail Security Groups DNS Management SSL Certificates Hosting Control Panel Domain Management Website Security cPanel Website Backup GoDaddy API Dynos Heroku Pipelines Add-ons Heroku Postgres Heroku Redis Heroku CLI Automated Deployments Buildpacks Git-based Deployments Jenkins CircleCI GitLab CI GitHub Actions Travis CI Pipeline Automation Continuous Testing Continuous Delivery Code Coverage Artifacts Rollbacks Webhooks Build Automation Docker Integration Deployment Automation Serverless Architecture Cloud Infrastructure Virtual Machines (VMs) Networking Configuration Load Balancers Storage Solutions Infrastructure Scaling VPC (Virtual Private Cloud) Network Security Monitoring Infrastructure as Code (IaC) Infrastructure Optimization Marketplace Development Multi-vendor Marketplace Sharetribe Go Sharetribe Flex Custom Marketplace Development Payment Gateway Integration Marketplace Scalability Sharetribe API Marketplace UX/UI Sharetribe Deployment MVC Architecture ActiveRecord Gem Bundler Action Cable RESTful APIs Convention over Configuration Rails Engines Active Job WebSocket Support Background Jobs TDD (Test-driven Development) Sharetribe Customization Sharetribe Expert Sharetribe Flex Sharetribe Go Sharetribe Expert Sharetribe Flex Developer Sharetribe Go Developer New Sharetribe

Hi, I'm Alex - a Senior WordPress/WooCommerce Developer specializing in peptide and research-compound eCommerce stores. I build, rebuild, and optimize peptide stores end-to-end: design, WooCommerce setup, high-risk payment gateway integration, and — as part of every build — WordPress Speed Optimization to hit 98–100% PageSpeed Insights scores and pass Core Web Vitals. Slow WordPress sites lose visitors, hurt SEO, and cost you money — and peptide stores are especially vulnerable, with heavy catalogs, compliance widgets, COA/lab-result pages, and high-risk gateway scripts all stacking up. Even with WP Rocket, fast hosting, and optimization plugins, many sites still underperform. That's where my expertise in WordPress JavaScript optimization, performance tuning, and real-world Core Web Vitals fixes comes in — built into how I build every peptide store from the ground up, and applied to any WordPress/WooCommerce project that needs it. 🚀 What I Do Peptide eCommerce (my core focus) ✔ Full WooCommerce builds for peptide & research-compound brands ✔ High-Risk Payment Gateway integration (Authorize.net, NMI, and other high-risk processors) ✔ Multilingual / WPML builds for international peptide brands ✔ Compliance-aware UX (age-gate, disclaimers, COA pages) without sacrificing speed WordPress Speed Optimization (for any WP/WooCommerce site) ✔ WordPress Speed Optimization — reduce load times, optimize WordPress JavaScript, improve mobile and desktop performance ✔ Core Web Vitals Optimization — LCP, CLS, INP fixes aligned with Google ranking factors ✔ PageSpeed Expert Audits — deep performance analysis using GTmetrix, PageSpeed Insights, and Google Search Console ✔ WP Rocket Configuration — advanced caching, CSS/JS optimization, lazy loading (configured to not break checkout, gateway, or compliance scripts) ✔ Mobile Speed Optimization — mobile-first Core Web Vitals improvements ✔ WordPress SEO Performance Optimization — speed-focused SEO enhancements ✔ eCommerce Speed Optimization — WooCommerce performance tuning for high-SKU catalogs ✔ Elementor Speed Optimization — reduce builder bloat and improve rendering ✔ Hosting & CDN Optimization — Cloudflare, SiteGround, server-level tuning ✔ Ongoing Speed Maintenance — continuous monitoring and optimization 🛠 My Approach as a PageSpeed Expert 1️⃣ Performance Audit — full audit using GTmetrix, PageSpeed Insights, and Google Search Console 2️⃣ Technical Optimization — WP Rocket, caching, database cleanup, image optimization, CDN setup 3️⃣ Core Web Vitals Fixes — real improvements for mobile and desktop 4️⃣ Testing & Validation — before/after testing with industry tools 5️⃣ Documentation & Handoff — clear report and recommendations I work with all types of WordPress projects: peptide & research-compound stores, WooCommerce stores in general, blogs, SaaS landing pages, agency websites, Elementor builds, and membership platforms — wherever performance, conversions, and SEO are critical. 📊 Results Clients Get 95–100% PageSpeed Insights scores Major Core Web Vitals improvements Faster load times (often 2–5 seconds faster) Better WordPress SEO and Google rankings Higher conversions and lower bounce rates Stable, scalable peptide stores that don't break under high-risk gateway or compliance requirements 🔧 Tech Stack & Keywords WordPress Speed Optimization | PageSpeed Expert | WP Rocket | Core Web Vitals | Google Search Console | WordPress JavaScript | WordPress SEO | GTmetrix | Mobile Optimization | Elementor Performance | WooCommerce Speed | Cloudflare | SiteGround | PHP | CSS/JS Optimization | Lazy Loading | CDN | Peptide eCommerce | High-Risk Payment Gateway | WPML ✔ Top Rated Plus WordPress & PageSpeed Expert ✔ 12+ years WordPress development experience ✔ 200+ WordPress sites optimized, including peptide & high-risk eCommerce stores ✔ Trusted by agencies, SaaS companies, and peptide/eCommerce brands If your WordPress or peptide store is slow — even with WP Rocket and good hosting — I'll fix it with real, data-backed optimizations. As someone deeply focused on peptide eCommerce and WordPress Speed Optimization, I work not just as a PageSpeed Expert, but also as a hands-on WordPress/WooCommerce Developer who understands how performance, code quality, high-risk payment flows, and real-world business goals connect — ensuring every build and every speed improvement is stable, measurable, and scalable. Ready to build or speed up your peptide store — or any WordPress site? Let's talk 🚀

Most website projects launch slow, bloated, and unable to convert. After 12 years as a WordPress expert and Full Stack Developer with 100k+ earned on Upwork, I have learned one thing: my job is not to install themes - it is to architect scalable WordPress website solutions that move revenue. Send me your project URL and I will reply with a free audit within hours. ⭐️⭐️⭐️⭐️⭐️ "The website exceeds my expectations. Linda is a top-tier WordPress expert who understands that design must serve the business, not just the eyes. Highly recommended." WHY CLIENTS PICK ME I am a WordPress expert who blends the technical depth of a full stack WordPress developer with the eye of a senior WordPress designer. As a WordPress developer and WordPress designer in one, you get end-to-end ownership with zero handoff friction - from the first line of code to a live, converting WordPress website. MY CORE EXPERTISE & SERVICES WordPress Website Development & Plugin Engineering As a WordPress developer and WordPress expert, I build high-performance WordPress websites on clean code — ACF, custom hooks, zero bloated plugins. From custom plugin development to full CMS development and CMS architecture, every WordPress website I ship is fast and built to scale. Whether you need a new WordPress website from scratch or a full rebuild, I deliver as a senior WordPress developer who treats every WordPress website like a product, not a template. Premium WordPress Website Design — Elementor, Divi & Avada As a WordPress designer and Elementor developer, I craft pixel-perfect builds using Elementor Pro, Divi, and Avada. Whether you need a WordPress designer for a Divi theme customization, an Avada setup, or a handcrafted Elementor website — I work as a WordPress developer and WordPress designer to create unique styles without template cloning. Every WordPress website design I produce as a WordPress designer is conversion-focused and brand-aligned. A great WordPress designer never copies — they build. WordPress Landing Page & Blog Design As a WordPress developer and WordPress designer focused on conversion, I build lead-capturing landing pages and custom blog layouts. Every WordPress website landing page I deliver is engineered to earn its place — combining the discipline of a WordPress designer with the precision of a senior WordPress developer. Good WordPress website landing page design is the difference between traffic and revenue. E-commerce — WooCommerce & Shopify Developer Complex WooCommerce checkouts, API integrations, advanced filters, and conversion-tuned stores. As a WordPress developer and WooCommerce specialist, I optimize every WordPress website for sales. Need to migrate WooCommerce to Shopify? I handle the full move with zero data loss. I am also a Shopify developer for dropshipping platforms and speed improvements. Every WordPress website ecommerce build I deliver as a WordPress expert includes WooCommerce SEO baked in from day one. LMS — LearnDash & Elementor WooCommerce Custom LearnDash builds paired with Elementor Pro and WooCommerce for course creators and EdTech platforms. I build seamless setups that are secure and user-friendly — always delivered by a WordPress developer who understands the full stack. WordPress SEO & Performance As a WordPress expert and WordPress developer, my builds consistently score 90+ on Google PageSpeed. Better rankings, stronger Core Web Vitals, and lower ad costs — because WordPress developer SEO and WooCommerce SEO are built in from day one, not added later. Every WordPress website I deliver is optimized before it ever goes live. RESULTS Enterprise E-commerce: +200% performance, +30% revenue. Full WordPress website redesign, WooCommerce SEO overhaul, and custom checkout plugins — delivered by a WordPress developer and WordPress designer working as one. Global SaaS Landing Page: +35% conversion rate. High-converting WordPress website design, 50% faster load after backend migration. TECH STACK WordPress Elementor Pro, Divi, Avada, Gutenberg, WooCommerce, Shopify, ACF, WPML, LearnDash, Gravity Forms, GA4, Yoast, RankMath. WHAT EVERY PROJECT INCLUDES Clean code — easy for any web developer to maintain. Mobile-first responsive WordPress website design. Google PageSpeed 90+ guaranteed before delivery. READY TO TURN YOUR WORDPRESS WEBSITE INTO A REVENUE ENGINE? 👉 Send me your URL. I will come back with a free audit and clear next steps — no pitch, no commitment. Just honest feedback from a WordPress expert who has seen every mistake and knows exactly how to fix it. 📅 Last updated: 01.07.2026