E-commerce | AI-Driven Platforms | Web3 | SaaS Architect | Shopify | WordPress | CMS I’m a Principal Engineer who has led and delivered projects across the full spectrum from early business requirement gathering and architecture design to frontend/back-end development, deployment, and long-term maintenance. Over the past 10+ years, I’ve built complex E-commerce systems, AI-powered platforms, and Web3 applications, always owning the full SDLC (Software Development Life Cycle). My focus is turning business ideas into scalable, maintainable, and high-performing digital products that directly drive growth and customer success. ⚙️ Core Technical Expertise Frontend / Web - React.js, Next.js (SSR/SSG/ISR), Redux, Zustand, Recoil - TypeScript, JavaScript (ES6+), TailwindCSS, SCSS, Material UI, Ant Design - Vue.js, Nuxt.js, SvelteKit, Astro - Pixel-perfect UI implementation from Figma or Adobe XD - Progressive Web Apps (PWA), Responsive design, Accessibility (WCAG) Mobile - React Native, Expo, Flutter, Swift (iOS), Kotlin (Android) - Shared UI libraries, API integration, Firebase push notifications Backend - Node.js (Express, NestJS, Fastify), Python (FastAPI, Flask, Django), PHP (Laravel, WordPress, WooCommerce) - Golang, Rust (for performance-critical services) - REST & GraphQL APIs, WebSockets, gRPC, Apollo Server - Authentication systems (JWT, OAuth2, Supabase Auth, Firebase Auth, Clerk, Auth0) Databases & Storage - PostgreSQL, MySQL, MongoDB, Redis, DynamoDB, Elasticsearch, Firestore - Prisma, TypeORM, Sequelize, Mongoose - Data warehousing: BigQuery, Snowflake, ClickHouse - File storage: S3, Cloudinary, Supabase Storage DevOps / Cloud / CI-CD - AWS (EC2, Lambda, ECS, S3, RDS, CloudFront) - GCP (Cloud Run, Firestore, Cloud Scheduler), Vercel, Netlify - Docker, Kubernetes, ArgoCD, GitHub Actions, Jenkins, CircleCI - Nginx, PM2, Terraform, Pulumi - Monitoring: Grafana, Prometheus, Datadog Architecture & Systems - Monolithic & Microservice Architectures - Event-driven systems (Kafka, RabbitMQ, SQS, Pub/Sub) - Serverless functions (AWS Lambda, Cloud Functions) - Scalable caching (Redis, CDN-level, local memory) - CQRS, DDD, Clean Architecture principles E-commerce & SaaS Platforms - Shopify (custom apps, Storefront API, Hydrogen) - WooCommerce, Magento, BigCommerce, Strapi - Custom E-commerce platforms with Next.js + Node/PostgreSQL - Stripe, Paddle, PayPal, Braintree integrations - Multi-tenant SaaS systems with subscription management - Admin dashboards, analytics, and marketing automation tools AI & Data Integration - OpenAI API, LangChain, RAG chatbots, embeddings search - TensorFlow, PyTorch, ONNXRuntime for model inference - Recommendation systems, personalization pipelines - Data pipelines (dbt, Airflow, Prefect), feature stores (Feast) Web3 / Blockchain - Solidity, ethers.js, web3.js - Smart contract deployment (Ethereum, Polygon, BSC) - Wallet integrations (MetaMask, WalletConnect) - NFT minting, marketplace, token-gated content 🚀 What I Deliver - Pixel-perfect E-commerce stores (Shopify, Next.js custom, WooCommerce) - Scalable SaaS platforms with subscription billing and admin dashboards - Microservices & API architectures ready for millions of requests - Serverless systems that scale automatically - AI-integrated solutions; chatbots, content generation, recommendation engines - Web3 applications; wallet login, NFT minting, on-chain analytics - Mobile apps; React Native & Flutter with synchronized back-end 🧭 Work Philosophy - I treat every project as if it were my own product. - Fast iteration with clean, maintainable code. - Business-oriented thinking: always focused on ROI and scalability. - Proactive communication, transparent progress updates, and clear documentation. - Guaranteed delivery; I consistently ship high-quality results ahead of schedule. 🌟 Why Clients Hire Me ✅ Principal-level engineer who owns full SDLC from vision to production. ✅ Consistently deliver fast, reliable, and scalable results. ✅ Long-term focus: I design systems that are future-proof and ready for growth. ✅ Strong product mindset; I align technical solutions with business goals. If you’re looking for a senior full-stack engineer who leads architecture, execution, and delivery across E-commerce, AI, or Web3, let’s talk. I’ll help you turn complex ideas into beautifully built, revenue-driving software.

Software delivery specialist: I fix stalled builds and ship the ones that matter. 20+ years building software, now running my own consultancy. Clients usually come to me in one of two situations: a project that's late, over budget, or inherited from a developer who vanished: or a product idea that needs building properly the first time. What I do: • Project rescue: audit, stabilise, and get a stuck build shipping again • MVP delivery: idea to working product, scoped tightly so it actually lands • AI integration: LLM features built to work in production, not demos I work to a fixed scope, fixed price and fixed deadline wherever possible. You'll know the cost and the delivery date before we start, and I'll tell you upfront if what you want can't be done in the budget you have. Happy to review your brief or existing codebase before you commit to anything. Message me and I'll give you a straight answer

I am a Full Stack Developer with a focus on Java and Angular, blending technical expertise with agile methodologies to create robust and scalable solutions. With experience in end-to-end application development, I optimize performance and manage incident resolution and application maintenance effectively. I am adept at understanding business needs and translating them into impactful digital solutions. My background includes working on diverse projects that require a keen eye for detail and a commitment to quality. If you need a developer who can navigate complex challenges and deliver polished results, I am ready to help. Let's discuss your project and find the best ways to achieve your goals.

I am a software engineer completed Masters in Management Information Systems from Daffodil international University. Successfully completed several Web and Mobile projects. I am also an IoT developer and worked with several platforms like AVR, Microchip PIC, Arduino, ESP8266, ESP32, Raspberry pi etc. My Skills: Salesforce FreshSales IRS eServices API TDS/SOR TalkDesk API/Webhooks NetSuite API Django stack (Python/Django/Redis) Ruby on Rails (Rails 2/3/4/5/6) MEAN stack (Express/MongoDB/AngularJS/Node.JS/Sails.JS) LAMP stack (Laravel/Codeigniter) Angular.JS (1.x and Angular2 with TypeScript) React.JS MySQL DBMS MongoDB PostgreSQL Javascript with various frameworks (jQuery, React.js) Android IOS Phonegap React Native IoT Raspberry Pi Jetson Nano Arduino ESP8266 ESP32 AVR PIC STM32 STM8 OpenMV OpenCV Machine Vision Computer Vision MQTT (Mosquitto) GSM/GPS NRF24L01+ LTE Cat M1 (LTE-M) NB-IoT LoRa/LoRa WAN (Worked with both 868MHz [Europe] and 433MHz [Asia]) Jetson Nano (Artificial Neural Network ANN) I am a fast learner and have the ability to work under pressure. Please feel free to contact me for more informations and please don't offer any payment or work outside of Upwork. Thanks

I design healthcare software that clinicians, administrators, and patients can actually use. With 20+ years of UI/UX experience and over a decade as a Top-Rated Plus freelancer on Upwork, I specialize in complex, workflow-heavy healthcare applications where clarity, efficiency, and adoption matter. Healthcare software presents unique design challenges: • multi-role users • documentation-heavy workflows • compliance constraints • scheduling complexity • real-world time pressure I create interfaces that reduce friction, improve understanding, and support people doing demanding work. My healthcare UX experience includes: • healthcare SaaS platforms • clinical and administrative dashboards • scheduling and workflow systems • mobile and web healthcare applications • patient-facing interfaces Clients value that I: • understand healthcare environments quickly • work efficiently and independently • communicate clearly • deliver thoughtful UX solutions without hand-holding • balance usability, business goals, and technical constraints I’m a Top-Rated Plus freelancer with thousands of hours worked and long-term client relationships. While healthcare UX is my specialty, I also work on SaaS and product UX projects in other industries when the problem is complex and meaningful. If you're building or improving healthcare software—or another sophisticated digital product—I can help you create something both powerful and easy to use.

Specializing in execution of email and multi-channel lifecycle programs for brands like Calendly, Apollo, and PlugShare. I bring to the table: - Braze expertise with multi-system comfort (familiarity with CDPs, analytics tools, etc.) - Personalization and dynamic content via Liquid (with Context variables), Content Blocks, Catalogs, and Connected Content - Experience with full AI Decisioning in addition AI-powered features such as Personalized Paths and Intelligence Suite - General AI literacy, experience building small utility apps using Claude Code, Cursor, etc. - Advanced Canvas and Campaign design and implementation - Email development with HTML + CSS (mobile responsive, dark mode) - Segmentation with custom events & properties, attributes, and Query Builder (SQL) - Data operations within Braze via webhooks and User Update steps - Multi-channel builds including Content Cards, mobile push notifications, and in-app messages Why hire me compared to other freelancers? I promise you: ✅ Reliability. I do what I say I'm going to do – on time and as expected. I'm not perfect, but I care about being a dependable resource. ✅ Communication. I believe clear and organized communication = fewer problems and better results. ✅ Ownership. I make an effort to think like an owner (re: the principal-agent problem). Not just doing enough to get by, but considering broader business objectives. ✅ Braze expertise. Braze has been my platform of choice since 2021, and I'm both Marketer and Technical Architect Certified. Primarily interested in working in Braze, enhanced with AI tools. Familiar with the role of tools such as Segment, HighTouch and data warehouses. I understand basic programming concepts and am comfortable working with product, data, and engineering teams to move lifecycle programs forward.

PROFESSIONAL SUMMARY Experienced Full-Stack Software Developer with over five years of experience in enterprise-scale application development. Carleton has a proven track record of architecting and delivering high-performance solutions using .NET, Java, and various cloud technologies. He specializes in Microsoft Graph API integration, real-time systems with SignalR, and clean architecture patterns3. He has successfully managed systems processing over 100,000 daily records while maintaining 99.9% uptime4. Carleton has a strong background in Agile methodologies, DevOps practices, and cross-functional team leadership.

Full-Stack .NET Developer | ASP.NET Core | Flutter Mobile Apps | MS SQL I’m a full-stack developer specializing in building reliable, scalable web applications with ASP.NET / .NET Core and cross-platform mobile apps with Flutter. What I work with every day: Backend: ASP.NET Core, C#, Web APIs, Entity Framework Frontend: JavaScript, modern web technologies Database: Microsoft SQL Server (advanced queries, optimization, stored procedures) Mobile: Flutter (iOS & Android) I help clients turn ideas into working products — whether that’s a new web application, REST APIs, database-backed systems, or Flutter mobile apps that connect to .NET backends. How I work: Clear communication and regular updates Clean, maintainable code Focus on performance, security, and usability Comfortable with both short fixed-scope projects and longer collaborations I take on side projects while maintaining high quality and meeting deadlines. If you need a solid .NET + SQL solution, a Flutter mobile app, or a full-stack feature built end-to-end, I’d be happy to help. Feel free to message me with your project details — I’ll respond quickly with honest feedback on scope and timeline.

I've spent 15 years sitting in the gap where software projects fall apart. Between what a founder sees in their head and what a dev team actually builds. I'm not a consultant who hands you a slide deck and disappears. I build. I founded and built Zenpost, an AI-powered marketing platform with a website builder, CRM, social scheduler, blog editor, and email tools, solo, in 8 months, using AI-assisted development. It's running in production today with real users. A traditional agency would've quoted 18 months and $500K+. That's not a sales line. That's what happens when you actually know how to use these tools instead of just talking about them. Here's where I come in for you: If your dev project is going sideways. Missed deadlines, buggy releases, a dev team that builds something different every time you describe what you want. I've walked into that mess more times than I can count, including a client whose previous team left them with a broken product and zero documentation. I got it stabilized and moving again. I'll tell you honestly what's fixable and what needs to be rebuilt. No sugarcoating, no padding the timeline to look better. If you need something built from scratch. I scope it properly first. Vague briefs produce vague products, so I get specific before a single line of code gets written. Then I build it, using AI-assisted development where it actually speeds things up without cutting corners. I've managed teams of 12+ developers and built enterprise-level products, so I know how to run this whether I'm coding it myself or leading a team. If you're trying to figure out where AI and automation actually fit in your business. Not the hype version. The version where I look at what you're doing manually right now and tell you straight which parts a machine should be doing instead. What I bring to a project: 15 years building marketing and sales software for agencies and service businesses A live product (Zenpost) I built and still run, so my AI-assisted development process isn't theoretical Experience managing teams of 12+ developers and leading builds from scoping to launch A background as an agency founder myself, so I know what it's like to be the non-technical person trying to evaluate whether your dev team is telling you the truth Direct communication. If your idea has a problem, I'll tell you before it becomes an expensive one I work best with founders who want a real partner on the technical side, not someone who just takes tickets. If that's you, let's talk about what you're building or where you're stuck.

Shopify developer and founder of One More Agency — 11 years building websites for brands around the world, focused on custom Shopify builds and ongoing development partnerships for the past 6 years. What I do best: full Shopify site builds from Figma (or from sketches), custom theme work on Dawn, Horizon, and OS 2.0 foundations, and the kind of tailored functionality off-the-shelf apps can't handle — custom subscription flows, rewards systems, multi-region storefronts, and WordPress to Shopify migrations. Recent work includes luxury skincare (Auteur), fashion (Anielka), lifestyle and movement (Sol Seok), kids' devices (Tin Can), apparel (Faherty, Pole Junkie), and subscription services (Billy Bubbles). I run a small team, which means I can take on larger projects without the quality dropping — when you hire me, you get a developer with a studio behind him when the brief grows. Comfortable working with clients who have a clear brief, and equally comfortable with the ones who have a rough idea and need someone to help shape it. Responsive, honest about tradeoffs, and happy to tell you when something won't work and find a better way.