Hire the Best soapUI Specialists
in Serbia

A dedicated full-stack web developer specializing in Contao CMS, Typo3, Webflow and Shopware. With extensive experience in PHP development, JavaScript, and custom API integration, I create high-performance, scalable web solutions. Skills & Expertise: ✅ Contao Developer – Custom theme & module development, Isotope E-Commerce integration ✅ Typo3 Development – Website customization, extension development ✅ Shopware Development – E-commerce solutions, plugin development ✅ Webflow Design – Website customization, SEO Optimization, responsivity optimization, website development ✅ PHP & JavaScript – Native PHP applications, API integration, frontend interactivity ✅ HTML5 & SCSS – Responsive, high-performance web design ✅ E-commerce Solutions – Isotope E-Commerce, Shopware, PayPal Rest API ✅ Automation & Scripting – Custom APIs, Pretix.eu API, webhook integrations ✅ Accessibility Enhancements – Ensuring websites meet accessibility standards ✅ GDPR & Cookie Compliance – Handling compliance issues for data privacy Additional Services: 💻 Website Touchups & Makeovers – I offer simple updates, enhancements, and design tweaks for Contao, Webflow and Typo3 websites to improve both aesthetics and performance. 💡 Accessibility Improvements – I ensure your website meets modern accessibility standards, enhancing user experience for all. 🔒 GDPR & Cookie Compliance – Expertise in handling GDPR and cookie compliance issues to protect your users’ privacy. Notable Achievements: 🚀 Developed a German online school using PHP & Contao CMS, integrating a custom PayPal order cycle 🚀 Built a custom API to efficiently cache Pretix data and implement real-time webhook updates 🚀 Created a frontend chat system with seamless API communication 🚀 Created a landing page for museum company Whether you need a custom Contao website or plugin, simple or advanced Webflow website, Typo3 extension or website , or an advanced e-commerce solution, I can help bring your vision to life. 💡 Let’s connect and build something amazing! 🚀

With 5+ years of QA automation experience, I've designed and maintained end-to-end test suites for high-traffic platforms — from gaming solutions handling thousands of daily users to enterprise SaaS products with complex workflows. What I bring to your project: — UI automation with Cypress and Playwright (cross-browser, responsive, and mobile-ready) — API testing and validation with Postman and REST-assured — Selenium/WebDriver for legacy and cross-platform coverage — CI/CD integration (GitHub Actions, Jenkins, GitLab CI) — Test strategy, framework setup from scratch, and team mentoring — Clear documentation and reporting so your whole team stays informed I've completed 30+ contracts on Upwork with consistent 5-star reviews, and I've held long-term engagements (1,000+ hours) because clients trust me to work independently and deliver reliably. If you need someone to build your test automation from scratch, expand existing coverage, or rescue a flaky test suite — let's talk.

I am a senior Full Stack Developer with 10+ years of experience building stable, scalable systems using PHP/Laravel, JavaScript, Node.js, MySQL, APIs, and CRM workflows (Salesforce, Zoho, HubSpot). I am a Certified AI Engineer (Gauntlet) with hands-on, production-focused training in: RAG architecture & retrieval workflows AI agents & automated multi-step reasoning pipelines LLM observability, analytics, and monitoring using LangFuse Evaluation systems for AI quality, safety, and output reliability Automation-based AI workflows (N8N, custom pipelines) Fine-tuning, spec engineering & model-level optimization Practical multi-model usage (OpenAI, Claude, etc.) This allows me to integrate robust, trackable, debuggable, and high-quality AI systems into real applications — not just prototypes. In addition to AI engineering, I bring strong experience in: CRM integrations (Salesforce, Zoho, HubSpot, Sage Intacct) Payment/subscription systems (Stripe, PayPal) Web automation (Zapier + custom code) Scalable backend/API development If you need modern web development or reliable AI-powered automation, I can design, build, and deploy your solution end-to-end. Let’s build something powerful. 🚀

I am a UI developer with i++ years of experience - the glue between front-end, backend, and design. Not from an arts academy, yet instinct tells me when a color palette is off or a space is missing between words. My core competency lies in the fine details: semantic, accessible, and SEO-friendly HTML built with WCAG, WAI-ARIA, and Schema.org in mind. I think before I code - and while I use AI copilots to boost productivity, I keep them on a short leash. If you care about accessibility and the subtle details; if your project is clever, useful, and a step toward Wor(l)d Peace ;-) you’re in the right place. My Flappy Bird score is 687 🐦. Get to know me by reading my freelancing manifesTTo (see portfolio section). Skills: design to HTML, UX design, HTML/CSS/JS, WCAG accessibility, WAI-ARIA, Schema.org, Screen readers, Tailwind CSS, Bootstrap, Zurb Foundation, Bulma, Buefy, var(--custom- properties), shadow DOM, web components, BEM, Less, Sass, Sass-lint, Flexbox, CSS grid, CSS animations, container queries, GSAP, three.js, above the fold critical CSS, SVG, noscript optimization, speed optimization, LCP, FOUT/FOIT/FOFT, icon fonts, jQuery, AngularJS, Vue/Nuxt, React/Next.js, BlitzJS, MUI, shadcn/ui, Flowbite, JSON, PageSpeed Insights, Lighthouse, Webdev Checklist, performance budgeting, BrowserStack testing, LambdaTest, SEO, gulp, npm, git, vagrant, Jenkins, Docker, Vercel, Netlify, AWS, GitHub Actions, Wordpress, PHP, Jekyll, Eleventy, Astro, SQL, email templates, TypeScript, CorelDRAW, Photoshop, InVision, Figma, Zeplin, ...

I work on backend systems where things need to work reliably in production. My focus is on: AI integrations (RAG pipelines, OpenAI, automation workflows) backend APIs (Python / FastAPI / Laravel) payment systems (Stripe, subscriptions, webhooks, transaction flows, Cards, SEPA,...) system stabilization and production issue fixing Recently, I’ve been building: RAG-based systems with hybrid retrieval (Qdrant + OpenSearch) AI automation workflows and API services payment integrations with complex billing logic and webhook handling backend architectures for scalable systems diffusion-based workflows, LoRA training, and model-serving setups for practical AI use cases I don’t approach projects as “just coding tasks.” Most problems I work on involve: broken flows unreliable integrations scaling issues unclear architecture decisions If something is not working as expected, I focus on finding the root cause and fixing it properly, not patching symptoms. Typical things I help with: fixing Stripe subscriptions, payments, and webhook issues building or stabilizing AI / RAG backends debugging production API issues designing backend architecture for new or existing systems supporting diffusion pipelines, LoRA training workflows, and related AI infrastructure Tech stack: Python, FastAPI, OpenAI, Qdrant, OpenSearch, Laravel, MySQL, Docker, AWS, Hugging Face Diffusers, Transformers.. If you need someone who can quickly understand your system and fix or build it without unnecessary complexity, feel free to reach out. *** AI Automation & RAG Engineer | OpenAI, FastAPI, Vector DB, Backend Systems *** I build production-ready backend systems for AI-powered applications. My focus is on: - RAG (retrieval-augmented generation) - OpenAI integrations - backend APIs with Python and FastAPI - vector search and hybrid retrieval with Qdrant and OpenSearch - AI automation workflows I’ve worked on systems that: - ingest and structure knowledge from multiple sources - perform hybrid retrieval using dense and keyword search - generate grounded responses with LLMs - support production-level usage, not just demos I do not build generic chatbots. I build systems where: - data is structured properly - retrieval is reliable - outputs are grounded and controlled Typical tasks include: - building RAG pipelines - developing AI backend APIs - integrating OpenAI into existing systems - improving retrieval quality and response grounding - designing AI workflows and backend architecture Tech stack: Python, FastAPI, OpenAI, Qdrant, OpenSearch, Docker If you need a real backend for your AI product, not just a prototype, I can help. *** Stripe & Payment Systems Engineer | Subscriptions, Webhooks, Laravel, APIs *** I specialize in payment systems and Stripe-based integrations. I’ve worked on: - subscriptions and billing flows - webhook handling and synchronization - failed payment recovery - transaction logic and consistency - card-related flows and backend systems Most issues I fix are not simple bugs, but problems like: - duplicate or missing webhook events - incorrect subscription states - payment flow inconsistencies - retry logic issues - reconciliation problems I approach these systems from a backend and flow perspective, not just API calls. Typical tasks I handle: - Fixing broken Stripe integrations - Debugging webhook issues - Implementing subscription systems - Stabilizing payment flows in production - Backend logic for billing systems Tech: Stripe, Laravel, APIs, MySQL, webhooks, backend systems If your payments are not behaving as expected, I can help you identify the root cause and fix it properly.