✅ Top Rated Plus on Upwork (Top 3%) ✅ 8+ years of experience as a Back-End Developer building scalable systems ✅ 3000+ hours delivered as a Backend Developer ✅ 30+ projects delivered, turning ideas into working software from start to finish 🚀 What I Do as a Backend Developer As a Senior Backend Developer, I design and implement scalable, secure, and high-performance back-end systems. My solutions support products used by millions of users worldwide. Key areas where I bring value as a Backend Developer: - API Development – REST & GraphQL APIs, versioning, error handling, and caching - Microservices Architecture – modular, distributed back-end systems designed for scaling - Cloud Infrastructure – AWS, GCP, and Heroku environments managed by me as a Back-End Developer - Database Engineering – PostgreSQL, MongoDB, MySQL, Redis optimized for speed and reliability - CI/CD & DevOps – GitHub Actions, GitLab CI/CD, Docker, Terraform for deployment automation - Security & Authentication – JWT, OAuth 2.0, RBAC, and secure login flows developed as a Backend Developer 📊 Real Business Impact as a Backend Developer As a Back-End Developer, I don’t just write code — I create back-end solutions that transform into measurable results. 🔐 Secure Login System – Built a credential-stuffing–resistant login with NestJS + Redis, now protecting millions of logins monthly. ⚙️ Dynamic Pricing Engine – Created back-end logic for personalized pricing (user segments, membership tiers, promotions), increasing conversions by 25% for an e-commerce platform. 📡 Real-Time Messaging API – Developed a back-end system with Node.js and WebSockets, enabling secure, real-time communication for a SaaS dashboard. 📈 Enterprise Dashboards – Architected the back-end for a monitoring tool used by 100+ engineers, improving productivity tracking and release cycles. 🤖 AI-Integrated Backend – As a Backend Developer, I integrated ML models into Node.js services to deliver personalized insights and review summaries, cutting manual work by 70%. 🧵 Workflow Automation System – Designed a back-end platform that automated logo approval processes, saving hundreds of hours in operational costs. 🌍 Industries Where I Work as a Back-End Developer 🏦 Fintech – payments, secure authentication, fraud prevention 🤖 AI & SaaS – scalable SaaS platforms and ML integrations 📱 B2B Tools – dashboards, workflow automation, collaboration systems 🛍 E-commerce – personalized pricing, order management, inventory automation 🧑‍💼 Enterprise Systems – back-end infrastructure for large-scale applications 💡 Why Clients Choose Me as Their Backend Developer ✔ Proven Success on Upwork – 3000+ hours, Top Rated Plus, 100% Job Success ✔ Scalability Expertise – back-end architectures designed for growth ✔ Security First – as a Back-End Developer, I prioritize stability and data protection ✔ Business-Oriented Approach – technical depth aligned with business outcomes ✔ Collaborative Workflow – clear communication with product managers, frontend teams, and stakeholders 🛠 Backend Developer Tech Stack Languages & Frameworks: Node.js, NestJS, Express.js, Fastify, TypeScript, JavaScript Databases: PostgreSQL, MySQL, MongoDB, Redis, Knex.js APIs: REST, GraphQL, JWT, OAuth 2.0, WebSockets Cloud & DevOps: AWS (EC2, S3, RDS, Lambda, VPC, IAM, CloudFront), GCP, Terraform, Docker, GitHub Actions, GitLab CI/CD Testing & Quality: Mocha, Chai, integration/unit testing, coverage tracking Monitoring & Integrations: Sentry, CloudWatch, Twilio, Google APIs, Segment 🔍 Ideal Projects for Me as a Backend Developer ✔️ SaaS platforms scaling rapidly and needing robust back-end foundations ✔️ MVPs requiring fast and clean delivery from a Back-End Developer ✔️ Real-time apps (chat, dashboards, notifications) powered by back-end systems ✔️ Migration projects moving from monoliths to microservices, led by a Backend Developer 🤝 Let’s Work Together If you’re looking for a Senior Backend Developer who can deliver scalable, secure, and business-focused solutions, I’d love to connect. 📩 Let’s discuss how my back-end expertise can bring value to your project.

Welcome to Mainflow👋 With over 6 years of specialized experience in Webflow, we transform your ideas into stunning, responsive websites, particularly for SaaS businesses. Our team is committed to delivering high-quality, user-friendly designs that enhance your brand and captivate your audience. Our services: 🟢 Webflow Development & Design 🟢 Figma to Webflow Conversions 🟢 Responsive Web Design 🟢 E-commerce Integration 🟢 Custom Animations & Interactions 🟢 SEO Optimization 🟢 Website Maintenance & Support ✅ Why Clients Choose Us 1. Webflow Certified Experts - Recognized by Webflow for our skills & quality 2. Top-Rated on Upwork - 100% Job Success and glowing client reviews 3. End-to-End Service - Strategy, design, dev, launch, and growth - all in one place 4. Fast, Transparent & Reliable - Clear communication, tight deadlines, and no guesswork Let’s collaborate to bring your vision to life!

I help startups, enterprises, and product teams build, scale, and automate AI-powered web and mobile applications using Claude, Claude Code, and modern fullstack technology. Trusted across industries | AI-Native Development | Fullstack + AI Automation Expert I'm a Fullstack Developer and AI Developer specializing in AI web and mobile app development, AI orchestrators, Claude-powered applications, SaaS platforms, and end-to-end automation systems. I combine traditional fullstack engineering with AI-native workflows — using Claude and Claude Code to design, build, and ship production-grade software faster and smarter. What I can help you with: AI web app development AI mobile app development Claude-powered application development Claude Code implementation and workflow automation AI orchestrators and multi-agent systems Fullstack SaaS development AI SaaS product development AI agent and chatbot development API integration (Claude, OpenAI, Gemini, Grok, Mistral, Llama) Cross-platform mobile app development Progressive Web App (PWA) development Cloud-native application architecture Database design and management DevOps, CI/CD, and infrastructure automation Legacy system modernization with AI tooling AI-assisted MVP development and rapid prototyping I'm especially a good fit for projects like: "Need an AI developer to build a Claude-powered application" "Looking for a fullstack developer experienced with AI orchestrators" "Need an AI web developer to automate our internal workflows" "Looking for an AI mobile app developer for a cross-platform build" "Need a Claude Code expert to accelerate our dev pipeline" "Need a fullstack AI developer to build our SaaS MVP" "Looking for an AI automation developer to connect our systems" With hands-on experience across fullstack and AI development, I focus on building reliable, scalable products that combine solid engineering with intelligent automation. MY INDUSTRIES FinTech, Healthcare, LegalTech, Web3/DeFi, EduTech, Logistics & Supply Chain, Transport, E-Commerce, Retail, Manufacturing, Distribution, InsurTech, GovTech & Public Sector, Real Estate & PropTech, Travel & Hospitality, Cybersecurity, Media & Publishing, AI/ML & Data Analytics MY SOLUTIONS Multi-Tenant SaaS, AI SaaS, Decentralized App (dApp), Mobile App, Cross Platform App, Booking Platform, Progressive Web App (PWA), AI Tool, Learning Management System (LMS), Electronic Health Records (EHR), Case Management System, Inventory Management System, ERP, CRM, Trading Platform, Customer Portal, Marketplaces, Cloud-Native Application MY TECH STACK Front End Development: React.js, Next.js, Vue.js, JavaScript, TypeScript, Tailwind CSS, HTML, Angular, jQuery Back End Development: Node.js, Express, NestJS, Nuxt.js, Python, Django, Flask, Laravel, PHP, Firebase Mobile App Development: React Native, Expo, Flutter, Kotlin, Swift Database Management: MySQL, MongoDB, PostgreSQL, AWS RDS Messaging/Queuing: Apache Kafka, RabbitMQ, Redis Streams, NATS API Integration: RESTful APIs, REST, SOAP, FastAPI, GraphQL, gRPC, OpenAPI, WebSockets AI Integration: Claude, Claude Code, OpenAI, Gemini, ChatGPT, Grok, Mistral, Llama Cloud & Infrastructure: Linux, VPC, VM, Terraform, Lambda, CloudFront, EC2, EKS, ECS, Fargate, Lightsail, RDS, S3, Kinesis, Kubernetes, Docker, Nginx Version Control: Git, GitHub MY SKILLS Full-Stack Development | AI Developer | AI Web Developer | AI Web and Mobile Developer | Claude Fullstack Developer | Claude Code | AI Orchestrators | Software Development | Front-End Development | Back-End Development | Web Development | Web Application | Mobile Development | Desktop | Artificial Intelligence | Blockchain Development | AI Agent | Web3 | Chatbot | AI App Development | AI Voice | SaaS Development | Database Management | API Integration | AI Integration | AI Automation | Solution Architecture | AI SaaS | AWS | GCP | Azure | DevOps | AIOps | MERN Stack | IaaS | IaC 11.07.2026

I'm a skilled Java backend developer with over 8 years of experience designing, developing, and maintaining robust backend systems. My expertise lies in Java, Spring Framework, Hibernate, and microservices architecture, allowing me to build scalable and high-performance applications. I am proficient in database management, API development, and cloud technologies like AWS, ensuring seamless backend solution integration and deployment. Strengths & Skills: - Java Expertise: Advanced knowledge of Java SE and EE, with a focus on clean, efficient code. - Framework Proficiency: Extensive experience with Spring Boot, and Hibernate. - Microservices Architecture: Design and implementation of microservices for distributed systems. - Database Management: Proficient in SQL and NoSQL databases (MySQL, PostgreSQL, MongoDB). - API Development: Skilled in RESTful API design and implementation, as well as integration with third-party services. - Cloud Computing: Experience with AWS services, including EC2, S3, RDS, and Lambda. - Version Control: Strong command of Git for version control and collaboration. - Problem Solving: Adept at troubleshooting, optimizing code performance, and resolving complex technical issues. Projects & Accomplishments: - Healthcare Documentation System: Played a key role in building a comprehensive healthcare documentation app, implementing microservices, and optimizing database queries. - Healthcare Integration System: Architected and developed a secure healthcare services application using Spring Boot and Hibernate, ensuring compliance with industry standards such as HL7 FHIR. Education: - Bachelor's Degree in Computer Science from State University of Intellectual Technologies and Communications, specializing in Software Development. I'm passionate about leveraging my technical skills to deliver high-quality backend solutions that meet client needs. Let's collaborate to bring your project to life!

Hello! I'm a QA Engineer from Ukraine with 20 years of experience in IT and 10 years specifically in QA and QA Team Leadership. My primary focus is manual testing, and I bring deep technical insight, attention to detail, and clear communication to every project. 🔍 Core QA Skills: Manual Testing of web, desktop, and mobile apps UI/UX Testing & usability evaluation API Testing using Postman Cross-platform testing with real devices and BrowserStack Game Testing for desktop & mobile (Windows, macOS, Android,iOS) Basic Security Testing using Kali Linux, Arachni, OWASP ZAP, Nessus, and OSINT tools Development of test plans, test cases, checklists and bug reports 💡 Tools & Technologies I work with: QA Tools: TestRail, Testlink, Zeplin, Figma, Swagger Dev Tools: HTML/CSS, ADB, Xcode, Android Studio, WordPress Payment systems: Stripe, CurrencyCloud, Thredd Bug Trackers: JIRA, Asana, Redmine, YouTrack, Trello, Pivotal Tracker, Basecamp, Airtable, Wrike, Linear 👥 Leadership & Mentorship: As a QA Lead, I mentor junior QA engineers, manage test cycles, and control QA team processes to ensure efficient and scalable testing. 🎮 Specialization in Game Testing: I have extensive experience testing games across platforms, ensuring not only functionality but smooth performance and player experience. 💼 Industries I've worked in: Outsourcing Game Development Studios Fintech Startups Event and Entertainment Platforms ✅ I combine technical depth, team leadership, and high responsibility. I am always focused on bug-free releases, efficient communication, and client satisfaction. Let’s ensure your users experience a polished, reliable product — I’d be happy to help!

🚀 Web & Mobile Development | SPA | SSR | E-Commerce | API integration| Dashboards | Multi-step Forms | Extensions 💡 I build high-quality, modern, and responsive web & mobile applications tailored to your business needs: ✅ Single Page Applications (SPA) ✅ E-Commerce websites ✅ Custom dashboards & admin panels ✅ Multi-step forms & wizards ✅ Browser extensions ✅ Hybrid mobile apps with Capacitor (iOS & Android) ✅ Pixel-perfect Figma/XD to code 🌱 100% Job Success | 💪 Top Rated Freelancer 🧠 Self-motivated, fast-working, and results-driven — I focus on writing clean, maintainable code and delivering projects on time. 🛠 Core stack: Vue.js, Nuxt.js, TailwindCSS, TypeScript, SCSS, Ant Design, Vuetify, Bootstrap 🔧 Also experienced with: React.js, Next.js, Node.js, Express, Capacitor 📩 Let’s talk — message me to get your project started!

I design SaaS products and build conversion-focused websites. Last landing page: cost per lead $1,096 → $295, 3.45% conversion. 20 years in design. What I do: → UX/UI for B2B SaaS: dashboards, onboarding, admin panels, multi-role systems, pricing pages → Webflow development: CMS, GSAP/ScrollTrigger animations, custom code, SEO, PageSpeed → Design systems: tokens, components, variants, responsive specs — built for your team to scale → CRO: landing pages that convert, backed by Mixpanel and Clarity analytics → AI-assisted workflow: I use Claude Code daily to build, ship, and iterate — generating code, JS logic, GSAP animations, integrations, and UX copy. Compatible with Webflow MCP for programmatic site editing. Recent work: → SaaS platform for Norwegian Chess Federation — 150+ screens, 3+ year retainer. Dashboards, tournament management, role-based access for 5 user types. Design system built from scratch. Sole designer. → Conversion landing page for Australian property company — A/B tested with Google Ads. CPL dropped from $1,096 to $295, 3.45% conversion rate, 3.5× more phone leads. Mixpanel CTA tracking + CMS. → NYC psychotherapy practice — full site redesign + Webflow build with GSAP animations. Conversion-focused UX for high-trust niche. → AimGod — my own SaaS product. AI-integrated personal growth system. Full design system with tokens and components. Dashboard, goal tracking, habit analytics. How I work: → Goals and conversion logic before pixels → Systems thinking: reusable components, scalable class structure → Developer-ready handoff: Figma specs, interaction notes, clean Webflow code → Handoff your dev or junior designer can execute without guesswork Tools: Figma, Webflow, Claude Code, GSAP, After Effects, Mixpanel, Microsoft Clarity. I work best with SaaS founders, product teams, and agencies who care about results — not just aesthetics.

With 10+ years building Java backend systems, I deliver production-ready software end-to-end — from API design and domain logic to the pipeline and environment it runs on. Most senior Java engineers hand off deployment to someone else. I don't. When there's no DevOps engineer on the team, I cover that ground myself — setting up CI/CD pipelines, containerizing services, configuring cloud environments, and making sure what I build actually runs reliably in production. You get one engineer who takes full ownership of delivery, not a gap between dev and ops that someone else has to fill. I also integrate AI-assisted development tools into my workflow to move faster and keep costs down for clients. I work with my preferred toolset by default, but if your team has privacy or data security requirements, I'm happy to work within your approved tools or constraints — no friction. Clients typically come to me with: ✅Backend systems that need to be built right from the start — clean design, solid APIs, room to scale ✅Legacy Java codebases that need modernizing without breaking what works ✅Microservices that need to be decomposed, redesigned, or made deployable ✅Teams without a dedicated DevOps engineer who still need a proper delivery setup I work across the full backend lifecycle: design, build, containerize, automate, ship, and monitor. ➤ Backend Engineering ✅Spring Boot & Spring Cloud microservices ✅REST & GraphQL API design ✅Event-driven systems (RabbitMQ and similar) ✅Database design & optimization (SQL & NoSQL) ✅System design for scalability and maintainability ➤ Delivery & DevOps — when the team needs it ✅CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins) ✅Docker & Kubernetes — containerization and orchestration ✅Infrastructure as Code (Terraform) ✅AWS & Azure — environments that support your full SDLC ✅Monitoring & observability (Prometheus, Grafana, ELK) ➤ What I Deliver ✅Well-structured backend systems your team can extend without pain ✅APIs designed for clarity, consistency, and long-term maintainability ✅Deployable, containerized services — not "works on my machine" software ✅Automated pipelines and stable environments when there's no DevOps engineer to own them ✅Production setups that are observable, cost-aware, and right-sized for your stage ✅Faster delivery and lower effort costs through AI-assisted development — with full respect for your data privacy preferences ➤ Working Style ✅I take full ownership — design decisions, delivery, and outcomes ✅Honest scope estimates, no surprises mid-project ✅I document what I build, so your team isn't dependent on me ✅Strong async collaboration across US, EU, and other time zones ➤ Industries ✅SaaS platforms & product companies ✅Startups and scale-ups ✅Enterprise engineering teams If you need a senior Java engineer who won't stop at writing code — someone who can take a feature from design to production without handing off to a specialist — let's talk. Message me and I'll review your current setup or requirements and tell you honestly what I can deliver and how. 🔑 Keywords Java, Spring Boot, Spring Cloud, Microservices, REST API, gRPC, RabbitMQ, Backend Developer, API Design, System Design, AWS, Azure, Kubernetes, Docker, Helm, Terraform, CI/CD, Bitbucket, Jenkins, Infrastructure as Code, Monitoring, Prometheus, Grafana, ELK Stack, Observability, Database Design, MySQL, MongoDB, SaaS Backend, Cloud Automation, SDLC, AI-Assisted Development, Productivity, Senior Java Developer

🏆𝗖𝗥𝗢-𝗙𝗼𝗰𝘂𝘀𝗲𝗱 𝗨𝗜 𝗨𝗫 𝗗𝗲𝘀𝗶𝗴𝗻𝗲𝗿 | 𝗦𝗵𝗼𝗽𝗶𝗳𝘆 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 | 𝗙𝗶𝗴𝗺𝗮 𝗘𝘅𝗽𝗲𝗿𝘁 👤 𝐈𝐧𝐝𝐢𝐯𝐢𝐝𝐮𝐚𝐥 𝐅𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐞𝐫 | 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐃𝐢𝐫𝐞𝐜𝐭𝐥𝐲, 𝐍𝐨 𝐀𝐠𝐞𝐧𝐜𝐢𝐞𝐬 𝐨𝐫 𝐌𝐢𝐝𝐝𝐥𝐞𝐦𝐞𝐧 👋 I am a results-oriented Independent UI UX Designer and Conversion Rate Optimization (CRO) Specialist. When you hire me, you work 1-on-1 with a senior expert - no agencies, no middlemen, and no communication gaps. I take full ownership of your product’s visual and functional performance, ensuring every pixel is strategically placed to drive revenue. 📊 Proven Impact: 📈 +33% Conversion Rate (E-commerce Product Page Optimization) 💰 +15.5% Average Order Value (Comprehensive Store Redesign) 📉 -11pp Bounce Rate (Homepage UX & Messaging Refinement) 🏆 100+ Projects | 6 Years Experience | 45+ Web Services | 15+ Mobile Apps 💰 Design That Drives Revenue I don’t just create "pretty" layouts; I build high-performing sales machines. By combining deep UX research with user psychology and data analytics (GA4, Hotjar, Clarity), I identify friction points in your funnel and transform them into conversion opportunities. Whether it’s a Shopify store, a B2B SaaS dashboard, or a Fintech mobile app, my focus is on metrics that matter: CR, AOV, CTR, and Revenue. 🎯 Specialized CRO Services ✨ E-commerce & Shopify Excellence: 🛒 PDP Optimization: High-converting product pages with strategic trust signals and optimized CTAs. 💳 Cart & Checkout UX: Reducing abandonment through frictionless, mobile-first checkout flows. 📣 Landing Pages for Paid Traffic: Optimized funnels for Meta Ads and Google Ads that turn clicks into customers. ⚙️ SaaS & B2B Platforms: 🚀 Onboarding & Activation: Streamlining user journeys to improve first-day retention. 📊 Dashboard & Complex Data UX: Intuitive data visualization for admin panels and SaaS tools. 💎 Freemium to Paid Conversion: Designing upgrade prompts that convert trial users to subscribers. 📱 Mobile App Design (iOS/Android): 📲 Retention-Focused UI: Engagement loops and intuitive navigation. 💸 In-App Purchase Optimization: Seamless subscription and payment flows. 📈 My Data-Driven Process 1️⃣ Audit & Discovery: Analyzing GA4 funnels and Hotjar heatmaps to find "drop-off" zones. 2️⃣ UX Strategy: Mapping user psychology and competitive advantages. 3️⃣ High-Fidelity UI (Figma): Crafting modern, clean designs using Advanced Component Systems. 4️⃣ Interactive Prototyping: Validating usability before a single line of code is written. 5️⃣ Developer Handoff: Providing pixel-perfect Figma files with responsive specs. 🛠 Tools & Expertise 🎨 Design: Figma (Expert), Framer, Adobe Creative Suite. 🧪 Analytics & CRO: GA4, Hotjar, Microsoft Clarity, A/B Testing. 🌐 Platforms: Shopify, Webflow, WordPress, React-based SaaS. 🔥 Why Partner With Me? 🤝 Direct Access: Personal accountability and fast, 1-on-1 communication. 🧠 Conversion Mindset: Every design decision is backed by data, not just "gut feeling." 📐 Technical Precision: My Figma files are organized, scalable, and 100% developer-ready. 🌍 Industry Versatility: Deep experience in Fashion, Beauty, Fintech, Health & Tech. 📂 Featured Success Stories ⭐ John Barber & Sons: E-commerce PDP Redesign | CR +33% ⭐ Agile Office Furniture: Homepage & Navigation CRO | AOV +15.5% ⭐ Grant Bank: Fintech Mobile App | Complete iOS UI/UX Design ⭐ Document Management SaaS: B2B Workflow & Dashboard Architecture 🚀 Ready to scale your business and increase your conversion rate? Click "Invite to Job" or "Hire Now" - let’s turn your current traffic into measurable revenue! 💸

Do you want to SHOOT someone? Than it is NOT to me. On all other tasks please count on me. And I also make websites and do programming ;-) ------------------------------------------- Some technical details: • My frontend stack: Vue (Nuxt, Pinia), React (Redux, Next, ReactNative), Angular, Ember. • My backend stack: Python, NodeJs (NestJs, Express), PHP (Laravel, YII) • I optimize for: Windows, MacOS, iOS, Android • DBs and Data management systems: MySQL, PostgreSQL, MongoDB , Redis, RabbitMQ • I use in my work process: Agile, Scrum, Git Flow, CI/CD, TDD, SOLID principles and unit testing. ------------------------------- I have finished more then 50 project and startups, and I will be glad to make and lead to the finish yours as well. Please contact me if you need it :) Regards, Vlad.