Hire the Best System Programmers in Kharkiv, UA

Seeking opportunities in Java/Perl/Python oriented development, shell scripting, BSD/Linux administration - to support your business. Java: Spring, Hibernate Perl: Catalyst/Mojo/Dancer, DBIx::Class Python: Django, FastAPI, SQLAlchemy DB: Postgres, MySQL/MariaDB On-hand experience with regular expressions (regexp), REST, and AJAX. I can work well alone and as a team member.

I'm Paul — a WooCommerce engineer and technical architect. I scaled a health startup from $0 to $80M in annual revenue, maintain WooCommerce platforms doing $2M+/month, and helped one store grow revenue 60% in a single year. Over 10+ years I've learned that growth is usually a technical problem in disguise — the store that can't scale is almost always held back by infrastructure that was never built to. Most of my clients aren't looking for a freelancer to knock out a task. They need someone who can see the whole picture — the architecture, the integrations, the team, the roadmap — and make good decisions across all of it. That's the role I step into: a technical partner accountable for outcomes, not just tickets. WooCommerce is usually where the conversation starts. Custom checkout flows, subscription systems, complex pricing logic, and performance that holds under load are table stakes for me. The higher-leverage work is usually the layer underneath: internal tools, automation pipelines, bespoke business logic, and custom engineering that doesn't fit into a plugin. What I actually work on: — WooCommerce architecture, custom plugin development, and platform builds well beyond off-the-shelf solutions. For high-traffic stores, the right call is sometimes moving critical logic — inventory, pricing, order processing — out of WordPress entirely and into dedicated NestJS microservices. WooCommerce stays the storefront; the heavy lifting happens elsewhere. — Performance engineering: not just PageSpeed scores, but the database queries, caching strategy, and infrastructure decisions that keep a platform fast and resilient at scale — the difference between a store that converts and one that buckles on its biggest day. — Internal systems and business automation: tools your team actually uses, workflows that remove manual overhead, integrations that connect your stack. — Technical leadership: stepping in as a de facto CTO or architect, leading dev teams, reviewing code, and keeping complex projects on track. — AI-powered features where they add real leverage — built into the product where it genuinely moves the needle, not as a buzzword. A recent example: a venture-backed infrastructure company — one running a large real-time network of thousands of connected devices across North America — came to me because, for all their scale and funding, they hadn't found a team that could reliably own their server infrastructure. I stabilized their platform under sustained real-time load (100+ concurrent users) where it had been faltering, so the operation kept running instead of buckling as they grew. That's the pattern in most of my work: the business is ready to scale, and the infrastructure is what's holding it back. My stack: PHP, JavaScript, React, Node.js, NestJS, and the full WooCommerce/WordPress ecosystem — plus whatever the problem actually calls for. I work with a small number of clients at a time. If you're building something that needs to last, and you want a technical partner who's done this before at scale — let's talk.

🚀 I’m a Senior WordPress developer & WooCommerce developer helping businesses fix critical issues, scale their websites, and increase revenue. I work with companies whose WordPress or WooCommerce projects are losing money due to bugs, slow performance, broken payments, or unreliable integrations. My goal is simple: make your website stable, fast, and profitable so it supports your business instead of blocking it. If your wordpress website is slow, unstable, or your woocomerce store has checkout errors, broken payments, API issues, or plugin conflicts — I can help. I work as a WordPress Developer, WooCommerce Developer, and PHP developer, focusing on solving complex technical problems that directly affect business revenue. As a WordPress Developer, WooCommerce Developer, and PHP developer, I work at the intersection of business logic and technical architecture. I help companies turn unstable WordPress and WooCommerce systems into reliable revenue-generating platforms by fixing deep technical issues, refactoring legacy code, and building scalable backend solutions. My experience as a WordPress Developer, WooCommerce Developer, and PHP developer allows me to quickly identify root causes, not just symptoms, and deliver long-term solutions that support growth instead of limiting it. Clients usually contact me when: ✔ Their WooCommerce checkout or payments stop working ✔ External APIs fail during registration or order processing ✔ Plugins conflict and cause random bugs ✔ Performance issues hurt conversions ✔ Existing wordpress website code is hard to maintain As a professional web developer and full stack developer, I don’t just “patch bugs” — I build stable, scalable solutions. ════════════════════════════════════════ Top Rated • 100% JSS • 113 Projects • 20+ Years Experience ════════════════════════════════════════ 🔧 WORDPRESS & WOOCOMERCE DEVELOPMENT As an experienced WordPress Developer and WooCommerce Developer, I work with both small and large wordpress websites. ✔ Custom WordPress plugins ✔ Advanced WooCommerce customization ✔ Checkout, cart, and registration flow logic ✔ Payment gateways (PayPal, Stripe, Braintree) ✔ WooCommerce REST API integrations ✔ Debugging complex woocomerce issues ✔ Performance optimization I understand the internal architecture of woocomerce, hooks, filters, and how to safely extend functionality without breaking updates. ════════════════════════════════════════ 🧩 BACKEND & API INTEGRATIONS As a senior PHP developer and full stack developer, I integrate third-party systems into WordPress, WooCommerce, and custom platforms. ✔ External API integrations ✔ Secure backend logic ✔ Webhooks and background jobs ✔ Data validation and synchronization ✔ Custom REST endpoints I also work as a python developer when automation, scripts, or backend services require Python-based solutions. ════════════════════════════════════════ 🛒 SHOPIFY DEVELOPMENT (when WordPress is not enough) When clients need Shopify, I also work as a shopify developer, helping migrate logic from WooCommerce or connect Shopify stores with external systems and APIs. ════════════════════════════════════════ 💼 PROFESSIONAL EXPERIENCE Before freelance work, I developed software for: medical systems aerospace and engineering projects This background allows me to approach every wordpress website and woocomerce store with strong engineering discipline, clean architecture, and attention to detail. ════════════════════════════════════════ 🛠️ TECH STACK Roles: WordPress Developer, WooCommerce Developer, PHP Developer, Web Developer, Full stack developer, Python developer, Shopify developer Languages: PHP, JavaScript, jQuery, SQL, Python (python developer experience), HTML/CSS, C#, Delphi, XML, JSON Platforms & CMS: WordPress, WooCommerce, Shopify, Joomla, OpenCart Databases: MySQL, PostgreSQL, MS SQL, Oracle, Firebird, MS Access Tools & Services: Git, Elasticsearch, OpenAI API, AWS, Postman, SVN, SEO ════════════════════════════════════════ 🤝 WHY WORK WITH ME ✔ Deep WordPress and WooCommerce expertise ✔ Strong backend and API experience ✔ Business-oriented problem solving ✔ Clear communication ✔ Long-term, maintainable solutions If you are looking for a reliable wordpress developer or WooCommerce Developer who can truly understand and fix complex issues — feel free to contact me.

I am a proficient mathematician and gained my PhD degree in mathematics in 2008. My field of research is mainly partial differential equations analysis but also includes ordinary differential equations and numerical modelling. I have published a number of high-level research papers, worked as a referee for scientific journals and wrote reviews for Mathematical reviews. I can help you with understanding research papers in this field, writing mathematics-related texts and reviews, and research tasks. I have teaching experience with university courses on partial differential equations, numerical analysis and calculus. Also I can help students with courses on algebra, geometry and ordinary differential equations. I use Octave for numerical modeling and teaching. I worked as a web developer in the past (mainly back-end, PHP and SQL) and can write code for mathematics to include it in the main program. I am also familiar with Python and C on a basic level.

I’m a Unity developer with over 3+ years of hands-on experience crafting high-quality mobile and PC games, as well as VR applications. In addition, I spent a full year mastering the craft through self-study and personal projects. Over this time, I’ve completed 12 commercial projects and 11 personal ones, working both independently and as part of a team. My strengths include full-cycle development — from prototyping and UI/UX to coding, optimization, monetization, and final polish. 🔧 What I bring: Strong C# coding and Unity engine knowledge Experience with in-game economy, ads integration, and analytics Smooth teamwork and clear communication A problem-solving mindset and eye for detail Let’s bring your game idea to life — and make it shine!

I am an experienced C++ programmer. My main task is to write competent, clean and optimized code that will work as efficiently as possible and is understandable to everyone. I also make completely cross-platform programs that will run on any operating system.