Full-Stack Dev & QA | Mobile Apps, Websites, AI, ML, Automation & APIs | 3+ Years Experience I build software that helps businesses save time, automate operations, and grow faster. Mobile apps, web applications, business systems, AI solutions, and automation tools built for real business results — not just project completion. 3+ years of professional experience. 𝟖𝟎+ projects delivered for clients in the 𝐔𝐒, 𝐔𝐊, 𝐀𝐮𝐬𝐭𝐫𝐚𝐥𝐢𝐚, 𝐀𝐮𝐬𝐭𝐫𝐢𝐚, 𝐔𝐀𝐄, 𝐔𝐤𝐫𝐚𝐢𝐧𝐞, and 𝐈𝐧𝐝𝐢𝐚. GitHub and Stack Overflow connected so you can review my technical background and development work. ➤ 𝐖𝐡𝐚𝐭 𝐈 𝐝𝐨, 𝐧𝐚𝐫𝐫𝐨𝐰 𝐚𝐧𝐝 𝐝𝐞𝐞𝐩: • 𝗔𝗜, 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 & 𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 AI applications, machine learning models, and data-driven solutions using Python and modern data technologies. I provide data cleaning, preprocessing, exploratory data analysis, visualization, feature engineering, supervised, unsupervised, and reinforcement learning, predictive modeling, automation workflows, and data processing using tools like Scikit-learn, Pandas, SQL, Excel, and CSV. • 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 Android and cross-platform applications built for reliability, performance, and long-term maintenance. Authentication systems, payment gateways, API integrations, push notifications, maps integration, Firebase, Supabase, deployment, maintenance, and post-launch support. • 𝗪𝗲𝗯 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 Custom web applications, dashboards, admin panels, CRM systems, ERP solutions, business portals, and internal tools designed to improve operations, reduce manual work, and support future growth. • 𝗠𝗮𝗻𝘂𝗮𝗹 𝗤𝗔, 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗔𝘀𝘀𝘂𝗿𝗮𝗻𝗰𝗲 Professional manual testing for web applications, mobile apps, desktop software, SaaS platforms, AI applications, APIs, CRM/ERP systems, and business software. I perform functional, regression, exploratory, smoke, sanity, UI/UX, usability, cross-browser, responsive, compatibility, user acceptance (UAT), API, database, and end-to-end workflow testing. Every issue is documented with clear reproduction steps, screenshots, expected vs. actual results, severity, and priority. I also provide bug reports, usability feedback, improvement recommendations, QA documentation, test cases, test plans, checklists, and final test reports. • 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀, 𝗔𝗣𝗜𝘀 & 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 Database architecture, API development, third-party integrations, payment systems, cloud services, backend infrastructure, and secure data management built with scalability in mind. • 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝘂𝗽𝗽𝗼𝗿𝘁 & 𝗗𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 Technical documentation, business documentation, spreadsheets, reports, presentations, research, data processing, and operational support. Well-documented projects are easier to maintain, scale, and hand over. ➮ 𝐖𝐡𝐚𝐭 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐮𝐬𝐮𝐚𝐥𝐥𝐲 𝐯𝐚𝐥𝐮𝐞: • Clear communication and regular updates • Direct access to the developer doing the work • Honest recommendations, even if they reduce project scope • Clean, maintainable, scalable solutions • Reliable delivery and realistic timelines • Long-term support after launch ➮ 𝐖𝐡𝐨 𝐭𝐡𝐢𝐬 𝐟𝐢𝐭𝐬: Startups building products. Entrepreneurs turning ideas into software. Businesses looking to automate operations and improve efficiency. Organizations needing reliable development and long-term technical support. Clients who value quality, communication, and professionalism. ➮ 𝐖𝐡𝐨 𝐭𝐡𝐢𝐬 𝐢𝐬 𝐧𝐨𝐭 𝐟𝐨𝐫: buyers. Projects with unrealistic deadlines or expectations. Clients looking only for the cheapest option. I focus on delivering quality solutions that create long-term value, not rushed work that becomes expensive later. ➮ 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: I reply within 𝟒 𝗵𝗼𝘂𝗿𝘀, often much faster. You work directly with me from start to finish. If there is a better solution, I will recommend it. If there is a risk, I'll tell you early. If something may become a problem later, I will explain it before development begins. I do not ghost. I do not disappear after accepting a contract. I do not disappear after delivery. Support, maintenance, documentation, and future improvements are available when needed. Your project represents an investment of time, budget, and trust. My goal is to protect all three while delivering software that works today and continues to work as your business grows. Send your requirements, project brief, or even just an idea. I will help identify the most practical, scalable, and cost-effective approach before development begins. let's build something exceptional. Need a trusted and expert technical partner? Send an invitation or offer , and let's get started.

AI-focused Technical Leader and hands-on Engineer with 22+ years building products from zero to production. I architect and ship AI-powered SaaS, B2B/B2C platforms, and enterprise systems - writing code daily while leading teams and strategy. 📞 Invite me to your job for a FREE 15-minute consultation! 📞 Highlights: 🤝 56,000+ hours & 220+ jobs completed (with my Upwork agency), all with 5-star reviews 🤝 Top 1% of All Talent on Upwork & "Expert Vetted" Badge 🤝 $2M+ revenue generated on Upwork alone 🤝 18+ years of Senior Technology Executive management experience in roles such as CEO, CTO, VP R&D, Head of Engineering, Systems/Software/Cloud Architect, DevOps, PM, etc. Technical leadership and managing remote and on-site teams of up to 30 What I Do: I help companies build AI-first products - from initial architecture to production. Think of me as your remote, hands-on CTO and Lead Engineer: I design systems, write code, manage engineering teams, collaborate with designers on UX, and ship. My company builds large open-source platforms (ERP/CRM/HRM, Commerce, Work / Project Management), and I bring that same 0-to-1 product-building experience to every client engagement. Over the years, I've helped hundreds of companies, from startups to large international enterprises, and have conducted business in the US, Israel, Ukraine, and Bulgaria. Worked remotely with companies worldwide: US, UK, Norway, Ukraine, India, Australia, etc. Worked on multiple highly complex commercial projects, both in startup and enterprise environments, with small and large teams. I can work with the team or develop software independently from the ground (to production), keeping the software quality along the way extremely high! Rates: - Short-term / consulting: $180/hr - Long-term engagements: $120/hr Services: - AI strategy, architecture & implementation for existing and new products - Fractional CTO / technical leadership for startups and scale-ups - Product architecture, estimation & 0-to-1 builds - Code reviews, performance optimization & solving complex technical problems - Team mentoring and engineering process improvement (Agile/Lean) Short summary of software engineering expertise: ◾ AI Agents & Multi-Agent Systems (LangChain, CrewAI, AutoGen, custom orchestration) ◾ LLM Integration (OpenAI / ChatGPT, Anthropic / Claude, Gemini, local models) ◾ RAG Pipelines, Embeddings, Vector Search, AI Chatbots ◾ ML / Deep Learning (TensorFlow, PyTorch, Python) ◾ SaaS (B2B & B2C) / Multi-tenancy Architecture ◾ Cloud & DevOps: AWS, Azure, GCP, Docker, k8s, CI/CD, Serverless ◾ 15+ years with .NET / C# ◾ 10+ years with JavaScript / TypeScript ◾ 5+ years with Node.js / NestJS ◾ Python (AI/ML, Django, Serverless), Java, and more In technology, my focus spans AI-powered systems, Web, Mobile & Distributed Software: - AI & ML: LLM orchestration (OpenAI, Anthropic, Gemini), AI agents, RAG, vector databases, TensorFlow, PyTorch, prompt engineering, fine-tuning. - Backend: Node.js / NestJS, .NET / ASP.NET Core, Python, JS / TypeScript. - Frontend: React/ReactNative, Angular, Vue. - Data: PostgreSQL, MongoDB, MS SQL, MySQL, Kafka, RabbitMQ, ElasticSearch. - Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, Serverless, CI/CD. Some of the latest OSS projects include: - An Agentic Runtime that Autonomously Builds and Maintains Web Apps - Orchestration System for Autonomous AI Companies - AI-powered Open-Source ERP/CRM/HRM Platform - Work and Project Management Platform with AI features - Modern Commerce Platform (reactive server, mobile & web apps) Feel free to message me to get more details about my experience relevant to your specific project, I am always open to new opportunities! 📞 Reach out by inviting me to your project right now! 📞 Looking forward to working with you on amazing projects, - Ruslan

If your app is broken, behind schedule, or stuck with bugs you can't diagnose, I can help. I specialize in taking AI-built and half-finished apps the last mile: fixing, hardening, auditing, and shipping them to production. I've been building production software for 35+ years, including a decade as CTO and then Chief Product Officer at a fintech platform, where transaction correctness, data isolation, and security were non-negotiable. I still sit in that seat today as a fractional CTO for founders, guiding teams from idea through MVP launch. I've led architecture, run engineering teams, and shipped systems that had to hold up under real operational stakes. I build with AI tooling every day, including Claude and the Anthropic API, and I run my own business operations on an automated AI-agent pipeline I built. That's why my delivery timelines run ahead of standard estimates, and why I know exactly where AI-generated codebases skip guardrails and where they hold up. My recent production work centers on React, Next.js, TypeScript, Supabase (Postgres, Auth, RLS), Node.js, and Stripe. Recent engagements include pre-launch SaaS architecture audits, Supabase RLS and API security reviews, rescuing AI-generated MVPs (Lovable, v0, and similar) into production, and LLM feature integrations. Common engagements: - Pre-launch architecture and security audits, with a written findings and remediation report (Supabase RLS is a specialty) - Stabilizing and finishing AI-built or half-built MVPs - API integrations that fail, timeout, or return incorrect data - Auth, webhooks, and data sync issues - React rendering, state, and performance problems - Node.js / Express backend errors and crashes - LLM features: chat, scoring, extraction, and agent workflows I also work with Web3 systems when a project calls for it, including Ethereum and Solana smart contracts, token integrations, and wallet-based workflows. I'm available for short-term fixes, audits, and ongoing support. If you're not sure what you need yet, start with an audit: you'll get a written findings and remediation report you can act on with or without me.

I'm a senior UI UX designer with 17+ years of experience specializing in the design of sophisticated digital products. I've designed and delivered products for global brands such as Lenovo, Medallia, and the National Bank of Ukraine. I take a business-driven approach to design, focusing on reducing churn, friction, and time to market while improving activation, retention, and conversion. The products I've delivered have collectively raised over $50M in investment, and one products has been nominated for the User Experience Design Award 2026. I've worked with international brands like Lenovo and Medallia, as well as on 30+ startups across fintech, AI, Web3, logistics, and business intelligence. My role often goes beyond visuals — I collaborate closely with web developer teams, align website design decisions with product strategy, and adapt solutions for platforms like wordpress when needed. As a saas ux designer, I specialize in ux design for data-heavy and logic-driven products. I regularly work alongside data engineer teams and domain experts such as accounting consultant roles to translate complex workflows into intuitive, user-centered experiences. Strong saas branding and consistent design systems are always part of the equation. As a web designer and ui ux designer, I turn complex ideas, datasets, and business constraints into clear UX & UI that actually work in production. Working as a product designer, I think in systems rather than isolated screens, focusing on how decisions scale across the product. I'm proactive by default and validate every design choice against user needs, product strategy, and technical feasibility to move products forward, not just follow specs. Key results • 30+ complex products launched across AI, FinTech, MedTech, Web3, logistics, and BI • $50M+ raised by clients after launch • 95% client retention rate with 2+ years average collaboration • Trusted by Lenovo, Medallia, National Bank of Ukraine, and a major MENA theme park & waterpark • One client acquired by a Fortune 500 company My design process 1. Discovery & research — understanding business context, user needs, and competitive landscape 2. Definition & planning — personas, user stories, user flows, and information architecture 3. Ideation & structure — sketches, wireframes, moodboards, and UI exploration in figma 4. Prototyping — high-fidelity interactive prototypes with clear hierarchy and usability focus 5. Testing & evaluation — usability testing, flow refinement, and dev-ready handoff 6. Post-launch support — analyzing behavior, friction points, and optimizing UX for retention and conversion Client success Blockasset: "Their commitment to quality, professionalism, and communication makes them a standout in their industry." Result: 4× faster development, 6× user growth, $3.5M raised. Sense360: "The Minimal team consistently delivered high-quality UI/UX and frontend dev work at an impressive pace." The product was later acquired by a Fortune 500 company. LogiPlan: "Their great skills and experience in UI/UX were impressive." Outcome: a unified logistics platform used by 200+ companies, 20,000+ deliveries planned, and 3,500+ resource bookings. 📩 Ready to jump into your product — from early-stage MVPs to scaling complex SaaS platforms.

Senior Product Designer with 6+ years and 500+ projects shipped across AI, SAAS, Fintech, and MedTech My designs have driven $7.5M+ in measurable business growth. I'm Top-Rated Plus on Upwork (top 3%) with a 100% Job Success Score. Founders and product teams hire me when they need a senior designer who can ship. 🧭 What I do for product teams ✨ AI-native product design. I work with conversational UIs, agentic workflows, trust-and-uncertainty patterns, and human-in-the-loop interfaces. I prototype in AI tools daily (Claude Code, Cursor, Figma MCP). 🧩 Mobile & SaaS product design. Consumer mobile (iOS/Android), B2B SaaS dashboards, fintech, healthtech, and emergency response. End-to-end ownership from research through developer handoff. 🎬 High-fidelity prototyping. Figma prototypes, ProtoPie, and React-coded prototypes when Figma can't go far enough. Prototypes that win pitch decks, unblock engineering, and validate ideas before they get built. 📈 Selected results ✅ UX/UI Designer for a Fintech Mobile App Redesign Full UX/UI redesign of a fintech mobile platform after a brand refresh tanked conversion. ▪ +6% conversion rate ▪ +18% user engagement ▪ +30% user growth ▪ Expanded service module across mobile and web ✅ UX/UI Designer for a Wellness iOS App Redesigned mood-tracking and onboarding flows for a high school wellness platform. ▪ Conversion rate lifted from 8% → 12% (50% relative increase) ▪ Refreshed brand system across product and marketing ▪ Improved daily retention through emotionally engaging journeys ✅ UX/UI Designer for a Healthcare Emergency Response (Tablet) Reimagined a non-emergency medical transport app from MVP to production-ready. Tablet-first redesign focused on dispatch, documentation, and hospital handoff. ▪ Restored trust and visibility across the full transport workflow ▪ Instant PCOS documentation export to receiving hospitals ▪ Reduced wrong-door arrivals and MDT fragmentation ✅ UX/UI Designer for a Military SaaS Mobile Application Designed a fast, field-ready jet fuel diagnostic tool for Air Force personnel, replacing complex lab-dependent processes. ✒️ Stack Figma (advanced variables, auto-layout, Dev Mode, Figma MCP), ProtoPie, Framer, React, Flutter. I prototype in code when it's faster than Figma, which is increasingly often. ✍️ How I work Async-first, weekly Figma walkthroughs, Loom over meetings, fast turnarounds. I don't pad hours. I don't disappear. I ship. 📍 Based in Traverse City, MI (US Eastern Time), working with clients globally. Looking for a senior product designer who can take your AI app, SaaS platform, or mobile product from rough idea to shipped, polished interface? Let's connect.

👋 Kevin here. I’m a builder and product lead who ships end-to-end. I run a boutique web agency (Greyrock Designs) focused on SMB clients, and I’m the co-founder of an AI-powered SaaS product built on Next.js with an Instacart API partnership. I take on select projects where I can add real leverage: custom web builds, AI/API integrations, and product development for startups that need someone who thinks like a PM and executes like a dev. What you get working with me: clear communication, a dedicated task board, and someone who ships with your customer experience in mind — not just the spec. Stack: Next.js · Supabase · Framer · OpenAI/Anthropic APIs · Instacart API · Vercel · Bubble

I build high-quality AR experiences for brands and product teams that need more than a novelty effect. My work focuses on interactive product communication: turning complex hardware, technical features, or abstract concepts into spatial experiences people can explore, understand, and remember. I’m a developer first with architectural thinking. That means I care about: - how the system behaves across devices, - how assets are optimized, - how tracking holds under real conditions, - how interaction feels intentional, not improvised. I work across WebAR, Unity-based AR, and social AR when it supports a larger brand concept. The goal is not “to add AR”. The goal is to make the product clearer, more engaging, and more premium. Brands typically bring me in when: - a product is difficult to explain with static visuals - a launch needs interactive depth - retail needs engagement beyond a screen - a campaign needs something people can actually explore I design and develop experiences that are: - visually refined and aligned with brand identity - technically stable across mobile devices - optimized for performance and fast loading - structured for handover and future reuse I don’t build fragile prototypes. I build interactive systems that can live in production. If you need AR that feels intentional, premium, and technically solid, not just decorative, we can build it properly. Unity AR Foundation ARKit ARCore WebXR WebAR Three.js Zappar Lens Studio Effect House WebGL Spatial Interaction Design 3D Modeling & Animation Blender Substance Painter PBR Shaders GLTF/GLB/USDZ pipelines Digital Fashion (Clo3D) AR for Beauty/Fashion/Retail Product Visualization Brand Storytelling in AR Interactive Product Visualization

I design and build digital products that increase retention and monetization — not just look good. I’ve spent years working on high-performance iGaming platforms, where every decision directly impacts revenue, and I now apply the same principles to SaaS, marketplaces, and complex digital products. 💰 What I actually improve: • Increase user retention and engagement • Improve conversion to paid users / deposits • Reduce drop-off in onboarding and key flows • Optimize user journeys and session time 🚀 Selected results: • Improved mobile retention (measured via session return rates after UX redesign) • Reduced bounce rate following full platform UX overhaul • Accelerated release cycles by 3x by improving internal tools and workflows • Scaled platforms to support 2000+ items with stable performance ━━━━━━━━━━━━━━━━━━━━━━━━ 🧠 What makes me different: Most designers focus on visuals. Most developers focus on code. I focus on how the product performs — combining UX, product thinking, and development to drive measurable results. ━━━━━━━━━━━━━━━━━━━━━━━━ 🧩 What I can help you with: • Product design (UX/UI) • Conversion & retention optimization • Complex user flows (onboarding, payments, dashboards) • Scalable product architecture • End-to-end product development ━━━━━━━━━━━━━━━━━━━━━━━━ 🌍 Experience across industries: • iGaming (casino, sweepstakes) • SaaS products • Gaming • Startups & digital platforms ━━━━━━━━━━━━━━━━━━━━━━━━ If you’re building or scaling a product and care about retention, monetization, and real performance, let’s talk.

🧠 Over a decade of experience in full-stack development 🏆 38+ successful projects delivered on Upwork ⏱️ 8,400+ hours logged on Upwork ⭐ 100% client satisfaction with repeat clients and long-term partnerships 🔧 Specialized in Web, Mobile, and Hybrid app development 🏢 Experience across both corporate and startup environments 🛠️ Technical Expertise • Frontend: React.js (Hooks, Redux, Context), Next.js, Tailwind CSS, TypeScript • Backend: Node.js, Express, Python (FastAPI), MongoDB, PostgreSQL, REST & GraphQL • AI & Automation: LangChain, OpenAI APIs, AI Agents, Serverless & Edge Functions • DevOps & Tools: Docker, GitHub Actions, Vercel, Firebase, Supabase, OAuth • Other: React Native, Electron, WebSockets, Stripe, UI/UX Design Systems I help startups and enterprises turn complex ideas into smooth, scalable, and beautifully designed web and mobile applications. I focus on building high-quality, future-ready products — from MVPs to complex platforms — with clean architecture, strong performance, and intuitive user experiences. Let’s create something exceptional together.

Most founders I work with are somewhere between a clear vision and a product that doesn't exist yet. Forty ideas, three that matter, and no obvious order to build them in. What usually happens first is that the idea gets smaller and sharper. Then it gets built. The part I enjoy most happens before the first line of code exists. Where the money comes from. What has to work for that to happen. What can wait until month six. 𝘼𝙣𝙙 𝙩𝙝𝙚𝙣 𝙄 𝙗𝙪𝙞𝙡𝙙 𝙞𝙩. 𝙎𝙖𝙢𝙚 𝙥𝙚𝙧𝙨𝙤𝙣, 𝙨𝙩𝙖𝙧𝙩 𝙩𝙤 𝙛𝙞𝙣𝙞𝙨𝙝. I build and run my own SaaS products. I've shipped to the App Store, watched which features people actually opened, and cut things at midnight to get a release out a week earlier. That's the experience I bring into your project from day one. What you get out of working this way: - A working first version in front of real users within weeks - A short, agreed build list that everyone is confident about before anything starts - A data model that still holds when feature twelve arrives - Payment flows that stay correct when a webhook fires twice or a card fails mid-subscription - A clear picture of what version one is and what it costs - Someone who says early on when something can safely wait Where I create the most value: - Multi-tenant SaaS with clean role separation and strict data isolation - Stripe and Stripe Connect, subscriptions, webhooks, onboarding, payment state that holds under real traffic - Multi-role platforms where permissions and workflow logic carry the product - Operational software with compliance requirements, audit logging, and backend-heavy workflows - AI features routed through the backend, with cost control and rate limits handled from day one - Existing products ready to be restructured for their next stage of growth Selected work: Water Testing Laboratory Platform. Multi-tenant, five user roles, mobile field sampling, audit logging, strict separation between independent labs sharing one architecture. Compliance-driven and running in daily operations. Pro-Am Gauntlet. National tournament circuit. Registration across three divisions, Stripe with server-side webhook verification, thirty-minute reservation holds with automatic release, full admin operations. Live and serving real events. Far Out MedX. Credential tracking SaaS for certification-heavy careers. Alert engine with deduplication across four expiry thresholds, GPT-4o Vision document import, public shareable profiles. Delivered across six milestones. Gamified financial literacy simulator (NDA). Next.js and Supabase. Realtime state engine driving individual participant state from collective audience votes, LLM avatar integration, dual curriculum switching. In active development. Kolibi and Orivela. Two products I built and shipped myself. Expo and React Native on Supabase, client-side encryption, Claude Vision, Postgres with RLS throughout, App Store pipeline end to end. Stack: Next.js, TypeScript, Supabase (Postgres, Auth, RLS, Edge Functions, Realtime), Vercel, Stripe and Stripe Connect, Expo and React Native, Resend, Anthropic and OpenAI APIs. Bubble for workflow-heavy SaaS products. Send me what you're working on, even if it's still messy. The first conversation usually sharpens the picture either way. If it fits, we start with a milestone that produces something real and working, and scope the next one from there.