Hello! I’m a CTO, Senior .NET Core Developer, AI Developer, and AI Agent Developer with 20+ years of experience in enterprise software engineering, cloud architecture, SaaS development, distributed systems, and AI Development. I have delivered 150+ AI projects, launched my own production AI products, and created the Managed Code Coding AI Framework (MCAF) — a structured framework for applying AI across the software development lifecycle while preserving engineering quality, governance, security, and predictable delivery. My work combines advanced AI Development with deep expertise in C#, .NET Core, Microsoft Azure, Orleans, enterprise architecture, and operational automation. What I Build • AI agents and multi-agent systems • AI chatbots, copilots, and intelligent assistants • OpenAI- and Claude-powered applications • RAG and enterprise knowledge systems • AI SaaS products and internal platforms • Workflow and business process automation • Scalable .NET APIs and distributed cloud systems • AI integration for existing and legacy software I work as an AI Developer, AI Software Developer, AI Chatbot Developer, AI App Developer, OpenAI Developer, Claude Developer, and AI Agent Developer. AI Agent Architecture I specialize in the systems layer that transforms an LLM into a reliable production-grade agent. My expertise includes: • Agent harness architecture • Execution, reasoning, and control loops • Multi-agent orchestration • Tool calling and task delegation • Context, memory, and state management • Guardrails, governance, and access control • Human-in-the-loop approval workflows • Validation, retries, fallbacks, and recovery • Agent evaluation, tracing, and observability An effective AI agent is not simply a model connected to an interface. It requires a complete operational architecture around the model: tools, permissions, memory, business rules, execution control, monitoring, and failure handling. Managed Code Coding AI Framework I created the Managed Code Coding AI Framework (MCAF) to help engineering teams adopt AI in a controlled, measurable, and scalable way. MCAF provides a structured approach to: • Integrate AI into software delivery workflows • Improve developer productivity without reducing code quality • Introduce governance and validation into AI-assisted development • Standardize how teams use AI across analysis, coding, testing, and documentation • Reduce delivery time and repetitive engineering work • Preserve security, maintainability, and architectural consistency The framework is designed for organizations that need more than isolated AI tools. It helps transform AI usage into a repeatable engineering capability. Business Value My objective is not to add AI for its own sake. I design systems that create measurable operational and financial value. Depending on the process, my solutions can: • Reduce manual workflow steps by 40–80% • Convert hours of repetitive work into minutes • Reduce AI and token costs by 30–70% • Improve system reliability through validation and fallback logic • Accelerate product delivery and internal decision-making • Increase process consistency and reduce human error • Extend existing teams without proportional headcount growth I focus on the full cost of ownership, not only initial development. This includes model usage, infrastructure, maintenance, observability, security, and long-term scalability. AI Cost Optimization I optimize AI systems through: • Model routing • Semantic and response caching • Prompt and context optimization • Selective retrieval • Context compression • Token budgeting • Structured outputs • Small-model and large-model escalation • Usage monitoring and cost controls This allows companies to maintain response quality while reducing unnecessary token usage, latency, and infrastructure expenses. Core Technologies C#, .NET Core, ASP.NET Core, Microsoft Azure, Azure OpenAI, OpenAI API, Claude API, Orleans, Aspire, RAG, vector and hybrid search, REST APIs, microservices, Docker, Kubernetes, DevOps, CI/CD, and MCAF. I can take a project from discovery and architecture to implementation, deployment, optimization, and long-term support—whether the goal is to build a new AI product, modernize an enterprise platform, introduce AI-assisted development, or automate complex business operations.

8 iOS apps shipped to the App Store. 100% Job Success on Upwork. I build iPhone and Apple Watch apps with AI features, and take them from idea to App Store approval in weeks, not months. I'm a solo iOS engineer and the founder of CYNQ Ventures, a mobile studio where I've designed, built, and shipped 8 apps end to end. Every part of the process you're hiring for is something I've already done on my own money and my own deadlines: architecture, UI, submission, rejection appeals, and the launch after. WHAT I BUILD • iPhone + Apple Watch apps - real-time sync, complications, standalone watchOS, hardware integrations • AI-powered features - OpenAI, Claude, and Gemini APIs wired into SwiftUI interfaces that feel native, not bolted on • Screen Time API and app blocking - one of the least documented frameworks on iOS; my open-source Screen Time toolkit is used by developers worldwide • Health and motion - HealthKit, CoreMotion, AirPods head tracking, CoreBluetooth • Monetization - RevenueCat, StoreKit 2, paywalls, and rescuing subscriptions when in-app purchases break • Launch assets - App Store screenshots, icons, and ASO copy, because I've optimized listings for my own apps and a dozen client apps HOW I WORK Bug fixes in 24–48 hours. Working prototype in 3–7 days. MVP in 1–2 weeks. You get a build you can hold in your hand every week, not a status update at the end of the month. I reply within 4 hours, flag problems before they turn into surprises, and tell you when something in your scope is a bad idea before you pay to build it. SELECTED WORK • Pongle - iPhone + Apple Watch live scoring with Flic button integration • LockIn Daily - Screen Time API focus app • UpRight - posture coach using AirPods motion data • StrideGate - HealthKit walk-to-unlock • NetCal - AI calorie tracking Whether you need a new app built, a stuck build rescued from App Review, or a listing that actually converts - send me the details and I'll tell you honestly whether I'm the right person for it.

A Senior React Native/Expo Developer & Software Architect with 9+ years of experience building high-quality mobile and full-stack applications — from MVPs to production systems used by thousands of users. I don’t just build apps — I design systems that are scalable, maintainable, and ready for growth. 🚀 What I specialise in: • ⚙️ Mobile architecture (React Native / Expo) — clean, scalable, production-ready • 🧠 Full-stack development — Node.js, PostgreSQL, Supabase, Firebase • 🌐 Web & admin panels — React, Next.js, dashboards, internal tools • 🤖 AI integrations — OpenAI, Claude, AI-powered features (recommendations, generation, automation) • 🔌 API integrations — payments (Stripe, RevenueCat), maps, analytics, third-party platforms • 📡 Real-time systems — chat, live updates, subscriptions, WebSockets • 🧪 Performance, debugging & stabilization — fixing complex apps, not just building from scratch • 👥 Tech leadership — leading teams, structuring projects, mentoring developers 📱 Experience: • 40+ mobile apps shipped (iOS & Android) • Built and scaled apps in: healthtech, fintech, social, marketplaces, AI products • Strong experience with existing codebase refactoring & stabilization • Led teams and delivered full-cycle development (architecture → release → scaling) 🛠 Tech Stack: Mobile: React Native (Expo & bare), TypeScript, Reanimated, React Navigation Backend & DB: Node.js, PostgreSQL, Supabase, Firebase (Auth, Firestore, Functions), REST, GraphQL Web: React, Next.js, admin dashboards, Vercel deployments AI & Integrations: OpenAI, Claude, AI workflows, OCR, recommendation systems Other: Stripe, RevenueCat, Mapbox, WebSockets, CI/CD (GitHub Actions, Bitrise), App Store & Google Play releases 💬 How I work I focus on: • clean architecture (so you don’t need to rebuild in 3 months) • fast iteration (MVPs in weeks, not months) • real product thinking (not just coding tickets) I’m comfortable: • owning the full product • jumping into messy codebases and fixing them • making technical decisions independently 🤝 Let’s work together If you need someone who can build, fix, scale, and actually think like a product engineer, I’d love to help. Let’s build something solid 🚀

Core Expertise - Walmart Engineer Native iOS: Swift, SwiftUI, Objective-C, Combine, Core Data, Core Animation Cross-Platform: React Native, Redux, Axios, React Navigation Web Stack: React, Next.js, Node.js, Firebase, AWS APIs & Data: REST, GraphQL, JSON, OAuth, Firebase Realtime DB AI Integrations: OpenAI API, TensorFlow Lite, ML-powered features DevOps: GitHub Actions, Jenkins, Jira, CI/CD pipelines Professional Highlights iOS Engineer – Walmart (2022–Present): Building enterprise-grade apps with SwiftUI and UIKit, improving app performance and user experience at scale. Lead iOS Developer – Occam Edge Technologies: Developed LIVIT, a SwiftUI + React Native healthcare app integrating BLE devices and HIPAA compliance. Network Administrator – Metrolink: Supported backend and infrastructure for the Metrolink Official App. AI Research – Uniquify (Samsung): Contributed to vision-based AI tools using Python and integrated cloud-based automation systems. What You Can Expect Pixel-perfect iOS apps that align with Apple’s Human Interface Guidelines Clean, modular, and maintainable codebases Transparent communication and reliable collaboration Experience working in Agile/Scrum environments A focus on user-centric design and long-term scalability Let’s Build Something Great Whether you need a native iOS app, a cross-platform solution, or a full-stack web product, I bring the technical depth and clarity to turn complex ideas into beautiful, reliable, and scalable software.

Envion Software helps companies build, modernize, and recover stalled software projects through senior engineering teams, fixed-cost projects, and time-and-materials development. We work with startups, growing companies, and established businesses that need reliable execution across full-stack development, cloud, DevOps, AI/LLM applications, data engineering, mobile, embedded systems, firmware, IoT, and legacy modernization. We can augment your existing team, take ownership of a defined project, or step into a stalled codebase to stabilize architecture, improve delivery, and restore forward progress. Clients choose Envion when they need experienced engineers who understand complex systems quickly, integrate smoothly with existing teams, and deliver dependable results.

I am an experienced full-stack mobile application developer with over 12 years of experience helping clients design and build high-quality mobile applications. I've developed and updated hundreds of successful applications for clients in different industries, ranging from startups to established companies. #Technologies# - Hybrid / Cross-platform: Flutter, React Native, Dart, JS, Firebase, AWS DynamoDB, Single Sign On, Parse SDK, Open AI API - Android: Java, Android Studio, XML, Jetpack, Android annotations,sqlite, Room, realm, firebase, parse sdk, AWS Single Sign On. - iOS: Swift, Xcode, Storyboard, Xib, Sqlite, Realm, Firebase, Parse Sdk, Single Sign On. - ML: NLP, Python, Pandas, Langchain, GPT, LLM, Fine-Tuning, Prompt Engineering, Streamlit, gradio, huggingface, transformer #Frontend# - JavaScript, TypeScript, React, Redux, HTML, CSS, Next.Is, Flutter #Backend# - Java EEE, Spring, Python, Node.js, Express.js,nest.js. Django #Databases# - GraphQL, MongoDB, MySQL, DynamoDB #Cloud Services# - Firebase, Heroku Scrum / Agile, AWS #Source Control# - Github, Bitbucket, Gitlab #Project Management# Jira, Trello, Github Projects #Design Tool# Figma, Adobe XD, Draw IO, Pencil #Software Architectures# - MVP, MVC, MVVM, Solid principles My ability to remain flexible and adaptable to project demands and shifting priorities sets me apart. I thrive in unfamiliar situations and enjoy learning opportunities and exposure to new ideas and experiences. I am open and willing to learn whatever is necessary to accomplish my client's goal.

Senior Full-Stack Developer & UI/UX with extensive experience in building, designing, and scaling over 100 successful SaaS platforms and mobile apps. My team and I specialize in TypeScript-based technologies like Next.js, React, Node, Nest.js, and React Native, delivering high-performance, scalable digital solutions. So far, with our help, our customers have reached: 📈 $57M+ in Annual Recurring Revenue 💰 $50M+ in Investor Funding Raised 👥 1M+ Monthly Active Users HOW I HELP YOU We make your app or software intuitive, performant, and built to scale - web, mobile, or desktop: 👨‍💻 Full Ownership, Zero Fragmentation: Strategy → UX/UI → Engineering → Launch. One integrated team. You ship faster without coordination overhead. 🎨 Design That Converts: Full UX design, redesigns, and rebrands - software that impresses users and moves business metrics. 🚀 End-to-End Development: From wireframes to deployment. User-centered design meets robust, scalable architecture. BACKGROUND I'm Felipe Telles, founder of Ego Eimi - a US-based tech studio. Before founding Ego Eimi, I led and scaled multiple tech companies from pre-seed to Series A+, secured two successful exits (2019 & 2022), and advised Fortune 500 companies on product and technology strategy. Now I focus on designing and developing top-tier web, SaaS, and mobile apps - integrating AI, elevating UX, and driving measurable business outcomes. With the right strategy, design, and technology, you will: ✓ Increase retention ✓ Lift conversion ✓ Create seamless experiences users love - and pay for NEXT STEP Message me about your project. I'd love to hear your vision and show you how we'll bring it to life.

AI SaaS architect, senior full-stack developer, AI developer, and automation expert. I build LLM/RAG systems, AI agents, agentic workflows, ChatGPT and OpenAI integrations, and production SaaS platforms that ship in 2–4 weeks. No prototypes. No disappearing after handoff. Founders and CTOs don't call me first. They call after the offshore agency delivered a half-working prototype. After the generalist ran out of depth. When the stakes are too high to get it wrong again — that's when they call me. I work like a technical co-founder: I understand your business problem as clearly as the technical one. No account-manager layer, no junior handoff. You work directly with senior engineering across architecture, implementation, deployment, and the post-launch fixes that real systems always need. Over 70% of clients come back for another engagement — because trust is easier to earn through delivery than through proposals. 📈 PRODUCTION RESULTS ✅ n8n + GPT-4 replaced a 12-person workflow — 10,000+ records/day at 99.2% accuracy, saving $380K/year. Shipped in 3 weeks. ✅ Flutter + Node.js fintech SaaS processing $2M+/month — 3 years ongoing, same client. ✅ React + LangChain legal AI tool — cut attorney document review time by 73%. ✅ Next.js + Supabase multi-tenant SaaS with Stripe — zero to $45K MRR in 5 months. ✅ Cross-platform Flutter app — 50,000+ active users across iOS, Android, and desktop. ✅ OCR + GPT-4 + LangChain document pipeline for logistics — 8x throughput, same headcount. ✅ HIPAA-compliant clinical RAG system — delivered in 5 weeks. ✅ Loan-decision latency cut from 4.2s to 280ms for a Series-A lender. ✅ Author of ngx-mask — 2M+ monthly npm downloads, used in fintech, healthcare, and enterprise SaaS worldwide. 🛠️ WHAT I BUILD → LLM/RAG features — OpenAI, Claude, Gemini, ChatGPT, RAG pipelines, AI agents, multi-agent systems, agentic workflows, semantic search, vector databases, embeddings. Evals, latency, observability, fallback paths included. → AI SaaS platforms, MVPs & PoCs — multi-tenant architecture, Stripe billing, RBAC, onboarding, analytics, CI/CD. From validated PoC to production-grade platform without rebuilding from scratch. → AI workflow automation — n8n + LLM pipelines replacing manual ops, copy-paste, spreadsheet cleanup, CRM updates. Human-in-the-loop review flows. 10,000+ records/day at 99%+ accuracy. → Cross-platform apps — Flutter developer, React Native developer, Expo. iOS, Android, web, and desktop from one codebase. Real backends, auth, payments, analytics. 50K+ users delivered. → Production backends — Node.js developer, NestJS, FastAPI, Next.js API routes, Supabase, PostgreSQL, event-driven architecture. Fintech, legal tech, healthtech, logistics — compliance-ready from day one. → Codebase rescue & audit — stalled builds, prototype rewrites, architecture reviews. Salvaged a $200K stalled build in 3 weeks. 🏭 INDUSTRIES → FinTech AI — underwriting automation, payment flows, real-time risk scoring, compliance-ready backends. → HealthTech AI — HIPAA-compliant RAG, clinical document processing, patient-facing AI workflows. → Legal AI — contract review, document intelligence, LLM-powered research tools. → Logistics & E-commerce — OCR pipelines, routing automation, AI-powered search, inventory automation. → RevOps & Enterprise SaaS — AI lead scoring, CRM automation, multi-tenant platforms, developer tooling. ⚙️ TECH STACK 🤖 AI/LLM: OpenAI API · ChatGPT · Claude API · Gemini · GPT-4 · LangChain · LangGraph · LlamaIndex · Pinecone · pgvector · RAG · Prompt Engineering · Vector Search · Embeddings · AI Agents 🖥️ Frontend: React developer · Next.js developer · TypeScript developer · Angular · Tailwind CSS · Flutter developer · React Native developer · Expo 🔧 Backend: Node.js developer · NestJS · Python developer · FastAPI 🗄️ Databases: PostgreSQL · Redis · MongoDB · Supabase · Firebase ☁️ Cloud: AWS · Docker · Kubernetes · GitHub Actions · Vercel · CI/CD ⚡ Automation: n8n · Make · Zapier 🚀 WAYS TO START → AI SaaS PoC in 72 hours — validate before committing full budget. Fixed scope, fixed price. → MVP in 2–4 weeks — production-grade from day one. Not a prototype. → LLM/RAG system in 2–4 weeks — production-ready, not a demo. → SaaS web app — Next.js developer + Supabase + Vercel, Stripe, auth, RBAC, CI/CD. → AI automation pipeline — n8n + LLM replacing manual ops. Shipped and running. → Codebase rescue — stalled build, architecture audit, prototype rewrite. → Architecture consultation — 60-min deep-dive into your AI strategy or SaaS system design. 🚫 NOT THE RIGHT FIT IF YOU need execution without architectural thinking, are optimizing for the lowest rate over ROI, or want someone who disappears at handoff. 📩 READY TO BUILD? Send me what you're building, where you're stuck, and what done looks like. I'll respond with the right questions, a proposed architecture, and clear next steps — usually within a few hours.

I’m Oleg Davydov, a London-based web and mobile app development expert and founder of Davydov Consulting. With 10+ years of experience and 150+ completed projects worldwide, I help businesses build digital products that don’t just look good - but actually perform and drive results. I don’t believe in templates or one-size-fits-all solutions. Every project I take on is built from scratch, tailored to your business, your audience, and your growth goals. I work as a long-term partner, not just a service provider. From the first idea to launch and дальнейшего scaling, I guide you through the entire process and help you make the right technical and strategic decisions. I’ve worked with startups, growing companies, and established businesses across multiple industries - including e-commerce, healthcare, legal, and high-end service brands. What I can help you with: • Custom Website Design & Development Clean UX/UI, strong structure, and conversion-focused builds - no shortcuts, no generic layouts. • Wix (Official Partner) Deep expertise in Wix Studio, Velo, and scalable CMS-driven solutions. I use Wix as a powerful custom platform, not a template builder. • Shopify & E-commerce High-performing online stores focused on conversion rate, AOV, and scalability. • Website Redesign & Migration Moving from WordPress or other platforms with improved structure, performance, and UX. • Mobile App Development Native iOS & Android apps (SwiftUI, Kotlin) - from MVP to full-scale products. • AI Integration Practical AI solutions: chatbots, AI agents, workflow automation, and custom GPT systems based on your business data. • Digital Growth SEO, paid ads, and optimization focused on real, measurable results - not vanity metrics. Why clients choose to work with me: • 10+ years of experience & 150+ completed projects • Fully custom-built solutions - no templates • Clear, fast, and transparent communication • Strong focus on both design and business results • Experience working with international clients At the end of the day, my goal is simple: to build digital products that work - not just visually, but as real business tools. If you’re looking for a reliable partner to design, build, and grow your digital product - let’s talk. 🚀

I am a business developer leading a dedicated in-house team of highly skilled web and mobile development professionals with over 30 years of combined experience. Our team specializes in delivering comprehensive digital solutions, including custom websites, web applications, mobile applications, CMS platforms, e-commerce systems, and crowdfunding solutions. Our mission is to help businesses achieve their goals by combining technical expertise, strategic thinking, and creative design. We have extensive experience working with a wide range of content management systems, including Drupal, WordPress, Joomla, and Magento, enabling us to build flexible, scalable, and secure websites that align with our clients’ unique requirements. On the e-commerce side, we design and develop high-performance online stores and web applications using WooCommerce, Drupal Commerce, BigCommerce, Shopify, as well as fully custom solutions tailored to specific business needs. Our development team is proficient in multiple programming languages, including PHP, Ruby, Python, and Perl, and leverages modern front-end and back-end frameworks such as AngularJS, Angular, Polymer, React, Bootstrap, Semantic UI, Laravel, Symfony, Django, and Catalyst. This allows us to deliver robust, scalable, and maintainable web applications. Our database expertise spans MySQL, PostgreSQL, and MongoDB, ensuring efficient and reliable data management for all types of projects. In addition to web development, we create seamless mobile application experiences using NativeScript, React Native, PhoneGap, as well as native iOS and Android development using Objective-C, Swift, and Java. Our team has extensive experience integrating payment gateways and processors, including Stripe, PayPal, Moneris, Braintree, and Authorize.net, supporting everything from simple integrations to fully customized web and mobile payment solutions. Beyond development, we provide end-to-end hosting, deployment, and infrastructure services. Our offerings include fully managed dedicated and shared hosting on our high-speed, custom infrastructure, complete with monitoring, backup, and maintenance. We also manage deployment and configuration on external cloud platforms such as AWS, GCP, Digital Ocean, Vultr, Acquia, Pantheon, and Rackspace, ensuring smooth, secure, and reliable operations. A key differentiator for our team is that all work is completed in-house—we do not outsource any projects. This allows us to maintain consistently high quality, security, and responsiveness, while fostering strong client relationships through direct communication and collaboration. Our offices in Vancouver and Kelowna, Canada, operating in the PST time zone, allow us to serve clients efficiently across North America and internationally. Our approach combines technical excellence, creative problem-solving, and strategic insight. From initial consultation and concept design to development, deployment, and ongoing support, we provide comprehensive solutions that drive measurable results for businesses of all sizes. With our expertise and full-service capabilities, we ensure that every project we undertake is delivered on time, on budget, and to the highest standards of quality.