💼 16+ Years of Experience 🧠 10+ Years as Architect 📚 Author: Java Hibernate Cookbook 🇺🇸 USA B1/B2 Visa Holder 📞 Voice AI & Calling Agent | 🤖 AI/ML | ⚛️ React | ☕ Java | 🚀 Node.js | 13+ Years | SaaS & Enterprise Systems I’m a seasoned Full-Stack Developer with over 16 years of experience building high-performance, scalable applications for startups and enterprises alike. My focus is on delivering quality SaaS-based and multi-tenant solutions tailored to client needs. I’ve worked across diverse industries including Banking & Financial Services, Healthcare, Transportation, Hospitality, HR, and IT. Whether leading offshore teams or managing projects solo, I bring strong technical leadership, clear communication, and business acumen to every engagement. 💼 Core Skills & Technologies Back-End Development: ○ Java, J2EE, Node.js, TypeScript ○ Spring Boot, Hibernate, Spring MVC, JDBC, JSP, Servlets, Backbase ○ Express.js, NestJS, Jest, Multer, Graphile Scheduler Front-End Development: ○ React, Angular (2+ to latest), Angular Material ○ HTML5, CSS3, SASS, SCSS ○ JavaScript, TypeScript, JSON Databases: ○ SQL: Oracle, MySQL, PostgreSQL, SQL Server, MariaDB ○ NoSQL: MongoDB, CouchDB, Couchbase, Firebase, DynamoDB, Apache Lucene Cloud Platforms: ○ Amazon Web Services (AWS), Google Cloud Platform, Microsoft Azure DevOps & Tools: ○ Shell Scripting, Jenkins, Kubernetes ○ Payment Integration: Stripe, PayPal ○ Industry Platforms: Backbase, EBICS 🧩 What I Bring to the Table ◎ Deep business understanding through real-world experience ◎ Proven success in enterprise-grade architecture & clean code delivery ◎ Strong communication, transparency, and professional integrity Let’s build something powerful together. I’m ready to support your project with skill, strategy, and sincerity.

🔹 What I build I build production backend systems that handle real-time distributed traffic at scale using Golang, Python and Node.js. I focus on systems where latency, reliability, and throughput directly impact production outcomes under high concurrency and event-driven workloads. I design and implement blockchain integration layers that connect backend systems with Ethereum-based transaction and wallet workflows in production environments. 🔹 Production impact Focused on building production-grade systems that improve reliability, throughput, and system resilience under real-world traffic conditions. Built real-time backend systems using Go, Node.js, and Python with Redis Pub/Sub and SSE for high-volume event-driven communication Designed and stabilized high-throughput API systems and microservice architectures under concurrent production traffic Developed blockchain transaction and wallet integration systems using Node.js and Ethereum-based stacks in production environments Implemented smart contract interaction layers and backend services for token and transaction workflows Built payment and external API integration systems with strong consistency, idempotency, and failure recovery requirements Operated cloud backend systems on AWS/GCP with scaling, monitoring, and production observability 🔹 Core engineering focus Distributed backend systems (Go / Node.js / Python) Event-driven architecture (Redis Pub/Sub, SSE) Blockchain transaction systems (Ethereum / Web3 integration) Backend ↔ on-chain data flow design High-concurrency API systems Production reliability, scalability, and latency optimization 🔹 How I work I identify bottlenecks in production systems across latency, throughput, and data consistency. I implement changes that improve system stability and performance across backend and blockchain layers without disrupting production traffic. 🔹 Availability Available for backend architecture, blockchain integration, system scaling, and production refactoring projects.

I'm a SAP FICO L2 Consultant with 2 years under DXC Technology under Nokia FICO RUN account. After I leave the company to seek for a new challenge I was hired as a Python Software Backend Developer for 2 years at Detail Online Tech Inc. and currently working full-time under automation team in DXC Technology supporting applications for Procter and Gamble under AMS Support Team. If you want reliable person for your projects with less cost, you're checking the right person.

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

I help startups and founders turn ideas into scalable SaaS products using React, Node.js, and AWS from initial concept to production-ready MVP. Over the past 10+ years, I’ve worked on multiple SaaS platforms, focusing on fast delivery, clean architecture, and long-term scalability. What I can help you with: Build your MVP from scratch (frontend + backend + cloud) Turn your concept or Figma designs into a working product Design scalable backend architecture (Node.js, PostgreSQL) Set up cloud infrastructure (AWS, CI/CD, deployments) Improve and refactor existing SaaS applications 💡 I don’t just write code - I help you make product and technical decisions to launch faster and avoid costly mistakes. 🧩 Relevant Experience 🔹 SaaS MVP Development Built multiple MVPs from scratch with React + Node.js Delivered production-ready apps within tight timelines Helped founders validate ideas and go to market faster 🔹 Backend & Architecture Designed scalable APIs (Node.js, Express/NestJS) Database design (PostgreSQL, MongoDB) Authentication, multi-tenant systems, integrations 🔹 Frontend Development React (hooks, state management, performance optimization) Clean UI implementation from Figma / designs 🔹 Cloud & DevOps AWS (EC2, RDS, S3, Lambda) CI/CD pipelines, Docker Deployment and monitoring setup AI-Driven Development Approach In addition to traditional software engineering, I actively use modern AI tools and workflows to accelerate development, improve code quality, and deliver solutions faster. My approach combines full-stack engineering expertise with AI-assisted development, allowing me to rapidly design architectures, generate reliable code components, automate repetitive tasks, and prototype complex features. By integrating AI into the development workflow, I can significantly reduce development time while maintaining high standards of scalability, performance, and maintainability. 📈 Example Outcomes Built MVP for a SaaS platform in 8–10 weeks from scratch Reduced infrastructure costs by 30% through AWS optimization Improved API performance by 2–3x for high-load applications ⚙️ Tech Stack React, Node.js, TypeScript, PostgreSQL, MongoDB, AWS, Docker, REST APIs, CI/CD 📩 If you’re looking to build or improve your SaaS product — feel free to reach out. Happy to jump on a quick call and discuss your idea.

I help healthcare companies and digital health teams build mobile apps faster, securely, and cost-efficiently, especially for connected devices, BLE integrations, and regulated environments. Instead of managing separate codebases, I deliver a single, scalable cross-platform architecture that supports medical-grade mobile applications, reduces development time by 40–60%, and maintains native performance. My focus goes beyond standard mobile development — I specialize in healthcare ecosystems, including: • Connected medical devices & wearables (BLE, IoT) • Real-time and near real-time health data processing • Apple Health / Google Fit integrations • HIPAA-aligned architectures & secure data handling • Remote patient monitoring & digital therapeutics apps Whether you're building an MVP or scaling an existing product, I help you choose the right architecture, avoid costly mistakes, and accelerate time to market. 𝙁𝙖𝙘𝙩𝙨 𝙖𝙗𝙤𝙪𝙩 𝙢𝙚 🏅 Built 100+ mobile applications across Flutter, iOS and Android 🚀 15+ years in mobile development including Flutter mobile development 🏆 Founded a technology company acquired by Microsoft 🌐 Developed developer tools acquired by AWS 🎯 Built products across Healthcare, IoT, Travel, Ecommerce and SaaS 💰 Helped startups launch profitable mobile products for iOS and Android 🔍 𝙃𝙤𝙬 𝙄 𝙃𝙚𝙡𝙥 𝙁𝙤𝙪𝙣𝙙𝙚𝙧𝙨 Whether you're building a startup MVP, SaaS platform, marketplace app or scaling an existing mobile development product for iOS and Android, I deliver production-ready Flutter mobile apps using modern mobile development architecture. 𝙈𝙮 𝙬𝙤𝙧𝙠𝙛𝙡𝙤𝙬 𝙛𝙤𝙘𝙪𝙨𝙚𝙨 𝙤𝙣: ✔ Fast MVP mobile development for startups ✔ Clean and scalable Flutter mobile development architecture ✔ Stable Flutter builds for iOS and Android ✔ High-performance UI and animations for Flutter mobile apps ✔ Long-term scalability in mobile development This approach helps companies reduce mobile development costs and launch faster across iOS and Android markets. 𝙎𝙝𝙤𝙧𝙩 𝙥𝙞𝙩𝙘𝙝 I'm a Senior Flutter Developer / iOS & Android Mobile App Developer with 15+ years of experience in mobile development. I design and scale mobile applications for iOS and Android using Flutter mobile development, Dart, Swift, Kotlin, Android development and iOS development combined with modern mobile architecture. Whether you need a Flutter developer, cross-platform mobile developer, startup MVP engineer, or mobile development expert for iOS and Android, I’ve got you covered. 𝙁𝙪𝙡𝙡 𝙡𝙞𝙨𝙩 𝙤𝙛 𝙢𝙮 𝙨𝙠𝙞𝙡𝙡𝙨 📱 Mobile Development: Flutter, Dart, Swift, SwiftUI, Objective-C, Kotlin, Java, Android, iOS 📲 Mobile Architecture: Flutter architecture, BLoC, Provider, Riverpod, Clean Architecture, MVVM 🖥 Web: TypeScript, JavaScript, React.js, Next.js 🔗 Backend & APIs: REST APIs, Firebase, GraphQL, WebSockets 🗄 Databases: SQLite, Firestore, MySQL, PostgreSQL ⚙ Tools: Git, CI/CD, Fastlane, TestFlight, Firebase With over a decade in mobile development, I also help with mobile product strategy, Flutter architecture consulting, AI integrations, backend infrastructure and full-stack development for mobile products. 𝙄𝙛 𝙮𝙤𝙪'𝙙 𝙡𝙞𝙠𝙚, 𝙛𝙚𝙚𝙡 𝙛𝙧𝙚𝙚 𝙩𝙤 𝙘𝙡𝙞𝙘𝙠 𝙩𝙝𝙚 𝙜𝙧𝙚𝙚𝙣 "𝙎𝙚𝙣𝙙 𝙖 𝙢𝙚𝙨𝙨𝙖𝙜𝙚" 𝙗𝙪𝙩𝙩𝙤𝙣 𝙖𝙣𝙙 𝙩𝙚𝙡𝙡 𝙢𝙚 𝙢𝙤𝙧𝙚 𝙖𝙗𝙤𝙪𝙩 𝙮𝙤𝙪𝙧 𝙢𝙤𝙗𝙞𝙡𝙚 𝙙𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩🚀 Over the years I’ve delivered Flutter mobile development solutions for iOS and Android startups, SaaS platforms and enterprise mobile applications, helping companies scale mobile development products across Flutter, iOS and Android environments. Flutter developer focused on Flutter mobile development for iOS and Android applications. Experienced in building scalable Flutter mobile apps for iOS and Android using modern mobile development architecture. I design and deliver Flutter mobile development solutions for iOS and Android startups, SaaS products and enterprise platforms. My work combines Flutter mobile development, iOS development and Android development to deliver stable mobile applications with high performance across Flutter, iOS and Android. 7/04

💻 Senior Java Developer | Spring Boot | Cloud | E-commerce | Automation | ETL | Space Systems | 10+ Yrs 🚀 10+ years of experience building scalable, cloud-native applications and automation systems using Java (8–21), Spring Boot, and modern DevOps practices. ✅ Why Choose Me? Enterprise Java Expertise: Deep knowledge in Java SE/EE, Spring Boot, Spring Cloud, JPA/Hibernate. Space Software Development: 3 years in mission-critical ground segment systems for satellite operations. E-commerce Automation: Integrated with Amazon SP-API, eBay, Etsy, Walmart, Shopify, and more. Cloud & DevOps: AWS, GCP, DigitalOcean, CI/CD (GitHub Actions, Jenkins, GitLab). ETL & API Integration: n8n, Make.com, custom data pipelines with FTP, SOAP, HTTP. Database Proficiency: PostgreSQL, MongoDB, Oracle, Couchbase, Cassandra, Elasticsearch. UI Skills: HTML, CSS, JavaScript, Bootstrap for clean, responsive interfaces. 🔧 Tech Stack Languages: Java, SQL, JavaScript Frameworks: Spring Boot, Spring Cloud, Spring Batch Cloud: AWS, GCP, DigitalOcean Databases: PostgreSQL, MongoDB, MySQL, Oracle, Cassandra DevOps: Docker, Jenkins, GitHub/GitLab CI/CD APIs/Automation: Amazon SP-API, Shopify, DHL, n8n, Make.com

Many of my engagements start the same way: “We hired a developer or agency, and now the project is late, unstable, or impossible to extend.” I specialize in inheriting partially built or failing software systems, diagnosing what went wrong, and getting them back on track - fast. I’m a Fractional CTO and hands-on architect with 20+ years of experience leading technical recoveries, building scalable SaaS platforms, and modernizing legacy systems for high-growth companies. My work has supported four acquisitions ranging from $65M to $500M. I’m typically brought in when: - A previous developer or firm under-delivered - Architecture decisions created performance or scaling issues - AI or data projects stalled due to poor design - The codebase exists, but no one understands it - Leadership needs clarity, direction, and a recovery plan - A past client recommended me to prevent these problems upfront Core Services **Fractional CTO & Technical Leadership** - Technical strategy aligned to business outcomes - Architecture reviews and recovery roadmaps - Build vs. buy decision-making - Hiring, mentoring, and unblocking engineering teams **Project Recovery & System Stabilization** - Inheriting incomplete or failing projects - Rapid audits of code, architecture, and infrastructure - Production stabilization under deadline pressure - Refactoring and re-architecture for scale and maintainability **AI, SaaS & Data Platforms** - AI chatbot and LLM-driven systems - Vector search and prompt orchestration - Multi-tenant SaaS architecture - Cloud-native backend services - High-volume data pipelines (AWS, Azure, Snowflake) **How I Work** - Rapid technical audit (code, architecture, data, infrastructure) - Identify what’s salvageable vs. what must be rebuilt - Define a clear recovery plan tied to business objectives - Stabilize production systems - Resume forward progress with clean, documented architecture This approach has been used to rescue SaaS products, AI initiatives, data pipelines, eCommerce platforms, and internal enterprise systems - often under tight deadlines and executive scrutiny. I’m not the cheapest option - and I’m not always the first developer hired. I’m the one teams bring in when getting it wrong again is no longer acceptable. If your project is already in trouble - or you suspect it’s heading there - I can help you regain control, stabilize delivery, and move forward with confidence. Open to New Projects: Currently accepting select engagements for rescue projects, greenfield development, architecture overhauls, and fractional CTO support. Message me to discuss your situation.

Full-Stack & Mobile Engineer (React, Next.js, Node.js, React Native, n8n, Supabase) ▪ 10 years I help startups and growing companies build high-quality web apps, mobile apps, and backend systems using React, Next.js, Node.js, React Native, TypeScript, Supabase, and PostgreSQL. I turn messy codebases and unfinished features into clean, fast, stable applications — web, mobile, and backend. I build MVPs in weeks, automate workflows with n8n, and ship production-ready releases at a predictable pace. My work has supported teams at Google, MIT, FedEx, and IPG Photonics (LightWeld used in SpaceX supply chain). Why me: 🏅 Top Rated Plus ▪ 100% Job Success ▪ $700k+ earned 10 years of hands-on full-stack, mobile, and backend development Shipped 70+ products across FinTech, HealthTech, SaaS, and marketplaces Built systems used inside Google, MIT, and FedEx Developed industrial software for IPG/LightWeld powering SpaceX-grade manufacturing Led engineering for a fintech mobile app with 250k+ monthly active users YC startup I worked with raised $1.6M after MVP What I deliver: • Full-stack development: React, Next.js, TypeScript, Node.js • Mobile app development: React Native for iOS & Android • Backend development: Supabase, PostgreSQL, Firebase, custom APIs • API integrations: Stripe, HubSpot, Slack, REST, GraphQL • Automation: n8n workflows (onboarding, CRM sync, internal tools) • MVP development in 4–8 weeks • Codebase rescue, refactoring, performance improvements • Long-term weekly development & product support Toolbox: React ▪ Next.js ▪ React Native ▪ Node.js ▪ TypeScript ▪ Supabase ▪ PostgreSQL Firebase ▪ Redis ▪ Swift ▪ Kotlin ▪ Docker ▪ AWS ▪ Vercel ▪ CI/CD ▪ n8n Automations You get someone who can architect, build, integrate, and actually finish things — not just write fragments of code. If you need a reliable full-stack or mobile engineer who delivers clean engineering and fast execution — let’s talk.

Every interaction a customer has with your business shapes whether they trust you, buy from you, or go somewhere else. I help businesses create exceptional digital experiences, from the first mobile visit to post-purchase interactions, while automating repetitive internal work using AI. 💡 Clients Say “We reduced loading times by 80% after Abdul led a Next.js performance overhaul. He’s now easily in the top tier of developers who understand full-stack performance deeply.” 💡 Recent Results - 50% productivity boost for a dental group using an Electron app that unified all internal tools. - 50% faster user experience after migrating an e-commerce and Referral site from .NET → Next.js. - 70% sales increase for a SaaS by building AI-driven recruitment workflows (resume tailoring, outreach automation, RocketReach + OpenAI). 💡 What I Bring - AI-powered full-stack applications (Next.js + Node.js + OpenAI) - RAG-lite and workflow automation systems for sales, operations & recruiting - High-performance SaaS dashboards optimized for speed and scale - Backend APIs & microservices with robust architecture and clean data models - Electron desktop apps for internal productivity and automation 💡 Core Tech Stack Next.js, React, Node.js, FastAPI, OpenAI APIs, RAG Systems, Supabase, Postgres, Neon, AWS, Vercel, Electron, CI/CD 💡 Ready to Build? Click “Send a Message” and I’ll review your goals, propose a plan, and outline the highest-ROI path for your product.