Highly motivated Full-Stack Web Development aspirant with a strong foundation in Java, C++, C, and Javascript. Currently honing my skills in the MERN Stack and am eager to contribute to a collaborative team. Built several projects utilizing the Discord API. Possesses experience managing and marketing projects, having spearheaded multiple NFT initiatives. Each project brought valuable problem-solving skills and insights into company operations. Proven ability to work independently while also thriving in collaborative environments. Eager to learn and continuously develop my programming expertise.

Dear client! My name is Lex, I am am AWS Engineer. Let me ask you: did you have it all on Upwork? Contractors who go offline for days without notice? Freelancers ruined your production environments? Agencies knowing what you need better than you? Indian folks who don't have a clue about a single thing written on their profiles? My morals are different. ⭐️ I am always on for you. My response SLA is minutes. Not hours. Not days. Minutes. ⭐️ My consulting style is gentle and non-invasive. You always have the final say. ⭐️ I am a narrow specialist: AWS is the only thing I sell here, but be certain that I am the best in my league. This is some of things I enjoy: ✅ Web and mobile cloud-native microservice and serverless architectures (AWS) ✅ Cloud solutions cost reduction ✅ External API providers and COTS systems integration using Apache Camel and n8n ✅ Data pipelines, ETLs, ELTs ✅ Bespoke technology assessments ✅ Fully autonomous AI agents My Technology Background ✅ Industry-standard enterprise Java stack: Spring Boot, Hibernate, Apache Camel ✅ Experience with Apache Kafka, ElasticSearch, Redis ✅ Exposure to front-end stack and paradigms: Angular, React, micro-frontends, SPAs ✅ Data stores: PostgreSQL, MySQL, MongoDB ✅ Cloud providers: Amazon Web Services ✅ Standards and protocols: OpenAPI, REST, Json RPC, GraphQL, Mambu, n8n

I help companies build software that is difficult to build. With 20+ years of hands-on engineering experience—including CTO and Head of Engineering roles—I design, build, modernize, and scale complex software products. I've worked with startups, fast-growing SaaS companies, trading firms, and enterprise organizations, leading projects from idea to production. My experience includes AI-powered applications, trading and fintech platforms, SaaS products, cloud-native systems, backend architecture, automation, and engineering leadership. I still write production code every day and enjoy solving challenging technical problems. Whether you need an MVP, a production-ready platform, AI integration, system modernization, performance optimization, or technical leadership, I can take ownership of the entire engineering process—from architecture and implementation to delivery. Core expertise: • AI Agents, LLMs & Automation • Trading & FinTech Systems (FIX, Market Data, Risk) • SaaS Platforms & Cloud Architecture • Java, Python, Node.js, TypeScript • AWS, Docker, Kubernetes, PostgreSQL • CTO / Fractional CTO / Engineering Leadership I prefer long-term partnerships where I can make a measurable technical and business impact.

🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 𝗣𝗟𝗨𝗦 🏆 ✅ Mobile App Developer 7+ years of experience ✅ SaaS Mobile App Developer 5+ years ✅ 35 mobile app development jobs completed successfully ✅ Android and iOS Mobile Expert ✅ Built 27+ UX-first Mobile App development jobs for 22 companies ✅ On-Time and Cost-Effective Delivery ✅ Future-Proof Solutions Showing a Minimum 41% ROI ✅ 4354 mobile app development hours on Upwork and still counting ✅ 100% Job Success in mobile app development (Client Satisfaction Ratio) ✅ 98% of Clients Recommended working with me ✅ 80% Long-term Repeat Clients ✅ 7+ years of experience in mobile app development, 6 years experience in iOS mobile app development, 7 years experience in Swift and Kotlin, 4 years experience in Flutter, React Native, 2 years experience in KMM, KMP Full stack mobile app developer and mobile app UI UX designer with 7+ years of experience in Mobile App Development, specializing in iOS, Swift, Android, Kotlin, KMM, Kotlin Mutliplatform / KMP, React Native, and Flutter. I have successfully delivered 120+ mobile applications in different roles as mobile app developer, flutter app developer, flutter full stack developer, flutter flow, mobile app design, mobile ui ux designer, swift ios developer, android developer, kotlin developer, react native developer, mobile game developer achieving a 5-star rating on Upwork and helping clients scale their businesses with high-performance solutions. Apart from mobile app development, I specialize in Mobile App Design for both iOS and Android, as well as Web App Design for SaaS platforms. My expertise extends to Interaction Design, User Flow Design, and creating seamless User Experience (UX Design) and User Interface (UI Design). I follow a Design Thinking approach, ensuring every solution is user-centered and problem-solving. My process includes UI/UX Wireframing, Prototyping, and building Style Guides or UI-kits for consistent branding. I perform Design Audits and Design QA to maintain high standards across all projects. 🛠️ Design Tools: My designs come to life through powerful tools like Figma, Zeplin, and InVision for prototyping and collaboration. I leverage Adobe Illustrator, Adobe Photoshop, and Adobe XD for detailed visual design. For complex wireframes and flow mapping, I turn to Axure, Sketch, and Balsamiq. I also use Miro and Abstract for brainstorming and version control, while project communication and management happen in Slack and Jira. Our Expertise at a Glance • Mobile App Development: Android, iOS, & Cross-Platform App Development using Java, Kotlin, Swift, Objective C, Flutter, and more. • Website and Full Stack Development: Crafting seamless back-end experiences with .Net, Python, Java, Javascript, React.js, Angular.js, Node.js, MERN, MongoDB, PHP, etc. • Logo & UI/UX Design: Bringing your ideas to life with Adobe XD, Photoshop, Sketch, Figma, etc. • End-to-End Solutions: From logo design, UI/UX development, workflow setup, testing to deployment in app stores, we've got it all covered. We do not use v0.dev lovable.app CursorAI, Cursor, Windsurf, Trae, GitHub Copilot, Tabnine, Qodo, Devin AI, and AutoDev for speed up coding, we know other methods to do it efficiently. We offer a comprehensive range of development services across mobile, web, and cloud platforms. Our mobile app development expertise includes building Android and iOS applications using technologies such as Flutter, Swift, Objective-C, React Native, and Xamarin, optimized for both smartphones and tablets with a focus on cross-platform compatibility. In website and full stack development, we work with .NET technologies, including full stack .NET development, .NET Core, and Python with Django. Our team is experienced in developing both backend systems and user-friendly, responsive web interfaces, as well as working with various CMS platforms. Our DevOps and DevSecOps capabilities cover cloud infrastructure and automation, leveraging tools like AWS, Azure, Docker, Kubernetes, GitLab CI, Ansible, and Terraform to build secure and scalable deployment environments. We also build cross-platform and web applications using frameworks like Three.js and design tools such as Webflow, creating visually engaging and functional user experiences across devices. Additionally, we are well-versed in integration and automation tools, including WebSockets, data integration, the ABP Framework, Discord API, and Autotask, allowing us to create seamless connectivity and workflow automation between systems. Talent Good Knowledge, Talented, Experienced, Skilled, Strong Experience, Proven Experience, Agency, Team, Company, Specialist, Proven Track Record, Strong Background, Write Clean Code, Deep Expertise, Bring to Life, Cross-platform, Attention to Detail, Long Term. ⚡️ AVAILABLE FOR NEW PROJECTS ⚠️ Press Invite Button on my page and let's talk.

I am an experienced Mulesoft developer with a strong background in Java EE. With over 15 years of industry experience, I have successfully delivered numerous integration projects and possess a deep understanding of enterprise-level application development.

I am a software developer with 16 years of experience in C++ and Java programming and over 11 years of expertise in Android Open Source Project (AOSP) development. I have a deep understanding of Android architecture, system component modifications, and creating custom AOSP-based solutions including secure hardened ROMs and deniable encryption solustions such as mobiflage I have experience in Android application development, building scalable, user-friendly apps with a focus on performance and reliability. Experience with background in FFmpeg and GStreamer, leveraging these technologies for multimedia processing and streaming solutions. My work with Sunshine and Moonlight-qt, open-source streaming platforms, highlights my ability to deliver high-quality remote desktop and game streaming solutions.

Why Choose Me as Your Development Partner? I’m a Senior Full-Stack & Mobile Developer (9+ years) who helps founders and teams turn ideas into production-ready web, mobile, and AI-powered products — fast, clean, and scalable. I combine strong engineering fundamentals with modern vibe-coding workflows to ship faster without cutting corners. ⸻ ✅ Proven Track Record • 🏆 Top 1% Rated Freelancer on Upwork • 🏆 1000+ hours of successful client delivery • 🏆 60+ projects delivered with consistent quality • 🏆 100% Job Success Rate • 🏆 Clean, maintainable, production-ready code ⸻ 🔧 Core Expertise (Full-Stack + Mobile) Frontend & Mobile • React, Next.js, Angular, Vue • React Native, Flutter, Ionic • TypeScript, JavaScript Backend • Node.js, Express • Java (Spring Boot) • Python, Go Databases & APIs • PostgreSQL, MongoDB • REST & GraphQL APIs • Elasticsearch • Vector databases (Pinecone, FAISS, Chroma) Cloud & DevOps • AWS (EC2, S3, Lambda) • Docker, Kubernetes • CI/CD (GitHub Actions, Jenkins) • Terraform (IaC) ⸻ 🤖 AI, RAG & Vibe Coding (Done Right) I build real AI systems, not demos. AI & RAG • OpenAI, Claude, Gemini integrations • End-to-end RAG pipelines (ingestion → embeddings → retrieval → re-ranking) • Secure data sources (PDFs, Docs, Notion, DBs, APIs) • AI chatbots for SaaS, internal tools, and customer support • Token cost & performance optimization Vibe Coding Workflow • Cursor, Windsurf, Claude Code • Replit & Replit Agent • Lovable.dev, Bolt.new • AI-assisted refactoring, testing, and reviews 👉 Human judgment + AI speed = reliable software ⸻ 🌟 How I Add Value I don’t just code — I: • Think like a product owner • Improve existing codebases without breaking things • Reduce tech debt and improve maintainability • Communicate clearly and proactively • Respect timelines, budgets, and existing architecture ⸻ 📩 Let’s Work Together If You Need ✔ Rapid MVPs or startup builds ✔ AI / RAG implementation ✔ Web or mobile app development ✔ Code cleanup, refactoring, or modernization ✔ A reliable long-term development partner 💬 I’m open to negotiation and long-term collaboration.

14+ Years of Architecture. 0% Technical Debt. Global Delivery Expert. Stop worrying about technical debt, slow performance, or missed deadlines. I don't just "write code"—I partner with businesses in the US, UK, Australia, and Europe to build enterprise-grade platforms that scale. As a Top Rated Plus Architect with over 11,000 hours on Upwork, I specialize in bridging the gap between complex legacy systems and modern, high-performance web applications. 🚀 What I Solve For You: • Legacy Modernization: Migrating GWT/Java systems to Next.js 15 & React 19 with zero downtime (Lead Architect for Property Vista's 2-year migration). • Scalable SaaS: Engineering multi-tenant platforms with complex RBAC and high-security standards. • Healthcare Compliance: Building audit systems to UK NICE & HIPAA standards (Expert in medical data integrity). • Data Visualization: High-performance D3.js & Highcharts dashboards for real-time anomaly detection. • AI Integration: Automating workflows using Gemini, Claude, and Llama for intelligent business logic. Technical Authority: • Frontend: Next.js 15, React 19, Angular (v14-20), TypeScript, Tailwind CSS. • Backend: Java (Spring Boot, Hibernate), Node.js, REST APIs, Microservices. • Cloud/DevOps: AWS, Azure, Docker, CI/CD Pipelines, GitHub Actions. Why Clients Choose My Architecture: • End-to-End Execution: From database design to React 19 frontends, I handle the full stack so you don't have to manage multiple freelancers. • Audited, Scalable Code: You get fully documented, unit-tested code that is ready for your next 10,000 users. • Honest Roadmaps: No over-promises. I provide realistic milestones and clear technical communication every step of the way. Unsure if your current stack can scale? Message me for a free 15-minute Architecture Consultation. I’ll review your requirements and outline your technical roadmap—completely free of cost.

🏆 TOP-RATED PLUS (Top 3%) | 7+ Years Full-Stack Development I build and modernize business-critical systems for financial services, energy, and healthcare, combining deep Java/Spring Boot backend expertise with production React front-ends. Enterprise experience at Société Générale, EDF, and CEGEDIM; freelance track record of 50+ delivered projects and 100% Job Success. ▸ BACKEND Java 21 • Spring Boot • Spring Batch • Spring Security • JPA/Hibernate RESTful APIs • PostgreSQL • Microservices ▸ FRONTEND React • TypeScript • Redux • Angular • Next.js • React Native ▸ CLOUD/DEVOPS AWS (CloudFormation, CloudWatch, Lambda) • Docker • CI/CD • Jenkins ▸ RECENT ENTERPRISE WORK - Société Générale: Migrated IFRS9 regulatory model pipelines, built async data-sync APIs, automated CloudWatch alerting via CloudFormation - EDF: Built internal budget-forecasting platform, implemented SSO with Spring Security, optimized admin dashboard performance - Multiple production React/Next.js apps: SSR migrations, payment integrations (Stripe), real-time platforms Clear communication, enterprise-grade code quality, consistent delivery. Comfortable owning a feature end-to-end, backend architecture through polished UI or slotting into an existing team on either side of the stack. Available for long-term engagements and B2B contracts.

I'm a full-stack developer working across two focus areas: AI agent development and browser game development. AI & LLM Integrations I build and customize AI agents using Claude Code, ClawdBot, OpenClaw, and related LLM tooling. What I do: - Set up and configure Claude Code for development workflows - Build custom MCP servers and tool integrations - Design and deploy LLM-powered agents and automation pipelines Browser Game Development I also build browser-based games using JavaScript and HTML5, with a focus on smooth physics, responsive controls, and performance optimization. My background includes Minecraft plugin and mod development, so I bring real game design thinking (game loops, state management, player experience) rather than just general web development skills. Recent game projects: - Snooker game with full physics simulation (ball collision, cue control, live scoring) - Real-time browser game style growth and collision mechanics Across both areas, I focus on clean, maintainable code and delivering something that actually works well for the end user, whether that's a smooth AI workflow or a responsive game experience.