Hire the Best OAuth Developers in Sydney, NSW

I build production-grade web applications and backend systems that scale — and I have the metrics to back it up. Over 5 years I've shipped full-stack systems across SaaS, logistics, and AI platforms. At PortPro, a drayage SaaS serving thousands of drivers across the US, I cut Mapbox API costs from $12K to $1.5K/month by architecting an intelligent caching layer, reduced database storage by 88% (700GB → 80GB) via a TimescaleDB migration, and led a team of 5 engineers to maintain 99.9% production uptime. Currently at Arrow Transport in Sydney, I'm building an enterprise logistics platform on .NET Core, React, and AWS ECS handling Australia-wide operations. On Upwork, I've delivered 15+ projects with a 100% Job Success Score and Top Rated Plus status — including a GPU-accelerated AI video generation SaaS (Produce.so), an AI companionship app backend (Frankie AI), and a Paddle-integrated property management platform (Host & Guest). What I build: — Full-stack web applications: React, Next.js, TypeScript, Node.js, NestJS — Backend systems and REST/GraphQL APIs: PostgreSQL, MongoDB, Redis — Cloud infrastructure: AWS (ECS, Lambda, S3, CloudWatch), Docker, Kubernetes — AI integrations: OpenAI API, Claude API, LangGraph, RAG pipelines — Async processing: BullMQ, FFmpeg video pipelines, webhook systems — Auth and payments: JWT, OAuth2, Stripe, Paddle, Apple Pay, Google Pay I'm based in Sydney, Australia (AEST) and available 30–40 hours per week. If you need someone who writes clean, documented code and communicates clearly throughout — let's talk.

🎯 12+ Years of Expertise | Web & Mobile Development | AI/ML Engineering | RAG & AI Agents | Scalable SaaS & Custom Solutions Welcome! I lead a multidisciplinary team of expert Web & Mobile Developers, AI/ML Engineers, and UI/UX Designers delivering powerful, scalable, and user-focused digital solutions. We specialize in cross-platform app development, AI-powered systems, and end-to-end product delivery for startups, enterprises, and innovative businesses worldwide. ✅ 𝐖𝐡𝐚𝐭 𝐖𝐞 𝐎𝐟𝐟𝐞𝐫 – 𝐂𝐨𝐫𝐞 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 💻 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Full-stack development using React, Next.js, Node.js, NestJS, Express SEO-optimized, mobile-first, and high-performance websites and web apps Admin dashboards, SaaS platforms, multi-tenant architectures 📱 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Cross-platform iOS & Android apps using React Native Smooth UX, native-like performance, and App Store / Google Play publishing Real-time features, GPS, camera access, media sharing, offline support 🤖𝐀𝐈/𝐌𝐋 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 & 𝐂𝐨𝐧𝐯𝐞𝐫𝐬𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐀𝐠𝐞𝐧𝐭𝐬 RAG (Retrieval-Augmented Generation) systems using OpenAI, LangChain, Pinecone AI Agents with Memory for personalized user experiences and task automation Custom AI/ML model integration, embeddings, fine-tuning, and LLM orchestration Chatbots & Virtual Assistants with contextual awareness and human-like interaction Rapid prototyping and deployment using Replit, Docker, and AWS 🛒 𝐄-𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐞 & 𝐌𝐚𝐫𝐤𝐞𝐭𝐩𝐥𝐚𝐜𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Custom online stores, subscription models, payment gateway integration Inventory management, order tracking, and dynamic product catalogs 🏥 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞, 𝐖𝐞𝐥𝐥𝐧𝐞𝐬𝐬 & 𝐅𝐢𝐭𝐧𝐞𝐬𝐬 𝐀𝐩𝐩𝐬 HIPAA/GDPR-compliant platforms for telemedicine, fitness, appointment scheduling Wearable integrations, health tracking, mental wellness & meditation tools 🧠𝐁𝐚𝐜𝐤𝐞𝐧𝐝, 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 & 𝐀𝐏𝐈𝐬 Scalable backend architecture with Firebase, PostgreSQL, MongoDB, MySQL Real-time syncing, API integrations, and secure data handling ⚙️𝐂𝐮𝐬𝐭𝐨𝐦 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬 𝐖𝐞 𝐁𝐮𝐢𝐥𝐝 💳 Payment Systems (Stripe, PayPal, Apple Pay, Google Pay) 🔐 Authentication & Security (JWT, OAuth, biometrics) 🔔 Push Notifications, Alerts & In-app Messaging 📞 Real-Time Chat, Audio & Video Calls (WebRTC, Twilio, Agora) 📲 WhatsApp, Social Media & CRM Integrations 🌍 Multi-language Support & Localization 📍 GPS & Maps Integration 📊 Analytics Dashboards with Custom Insights ⭐ Ratings & Review Systems 📦 Inventory & Order Management 🧾 PDF Invoice & Receipt Generation 🚀 CI/CD Deployment, Cloud Hosting, App Store Submission 💡𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐔𝐬 ✔ 12+ years of proven experience in Web, Mobile & AI/ML Development ✔ Delivered 100+ successful digital products across multiple industries ✔ Strong focus on intuitive UI/UX and performance optimization ✔ Expert in building both MVPs and complex, scalable systems ✔ Seamless project communication and milestone-based delivery ✔ Post-launch support, maintenance, and long-term partnerships 🧠 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 & 𝐓𝐨𝐨𝐥𝐬 Frontend: React, React Native, Next.js, Tailwind, Redux, TypeScript Backend: Node.js, NestJS, Express, Firebase, MongoDB, PostgreSQL, MySQL AI/ML: OpenAI, Hugging Face, LangChain, AutoGen, FAISS, Pinecone, Weaviate Cloud & DevOps: AWS, Docker, GitHub Actions, Replit, CI/CD Pipelines AI Agent Frameworks: Multi-agent systems, Task automation, Context memory Tools: Figma, Jira, Notion, Trello, Slack 🚀 𝐋𝐞𝐭’𝐬 𝐁𝐮𝐢𝐥𝐝 𝐘𝐨𝐮𝐫 𝐍𝐞𝐱𝐭 𝐁𝐢𝐠 𝐈𝐝𝐞𝐚 Whether you're looking to: Build a cross-platform mobile app Launch a custom SaaS platform Develop a conversational AI agent or RAG-powered assistant Modernize an enterprise system or streamline internal workflows We’ve got you covered from idea to launch and beyond. 📌 𝐋𝐞𝐭’𝐬 𝐜𝐨𝐧𝐧𝐞𝐜𝐭 𝐚𝐧𝐝 𝐭𝐮𝐫𝐧 𝐲𝐨𝐮𝐫 𝐯𝐢𝐬𝐢𝐨𝐧 𝐢𝐧𝐭𝐨 𝐚 𝐡𝐢𝐠𝐡-𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐢𝐧𝐠 𝐝𝐢𝐠𝐢𝐭𝐚𝐥 𝐩𝐫𝐨𝐝𝐮𝐜𝐭.

🎁 I guarantee a full refund if I fail to meet your expectations or deliver as promised—no excuses, no questions asked! 100% Customer Satisfaction 🌟 | BS In Software Engineering 👨‍🎓 | MS in Data Science I'm Adil Saleem, I specialized in full stack web and mobile application development. Involved in solution designing, developing, deploying, testing, and debugging of large-scale applications. Tech Stack: -------------- ✅ Frontend: React Js, Next Js, Typescript, MUI Components, AntD, React Native, jQuery, Bootstrap, Tailwind css, HTML5/CSS3, UI/UX, Media Queries, GSAP, ThreeJS ✅ Backend: Node Js, Express JS, Next Js, JWT, Authorization, OAuth, GraphQL ✅ Mobile App: React-Native, iOS, Android ✅ DevOps/Cloud: Docker , Kubernetes, AWS (EC2, EKS, ECS, VPC, S3, API Gateway, Lambda, Load Balancers) Github Actions , Jenkins, CI / CD , Serverless, Terraform, API Gateway ✅ Databases: AWS Dynamo DB, SQL Server, PostgreSQL, MySQL, MongoDB, Firebase, Supabase ✅ Integrations: -OAuth Providers: OAuth, Auth0 -Social Media APIs: Facebook API, Google API, Instagram API, Youtube API, Tiktok API, Whatsapp API -Payment Gateways: Paypal API, Stripe API -Communication: SendGrid, Sockets.io, OpenTok (video calling), WebRTC -Other APIs: Krogger API, WeChat, Linkedin APIs -Data Visualization: High Charts, jQuery Data tables, ChartJS ✅ Version Control: Github, Gitlab, Bitbucket WHY HIRE ME? ✅ Proven Track Record: 100% Job Success Rate ✅ Versatile Expertise: E-commerce, Business Websites, Custom Solutions, Scalable APIs – I’ve tackled it all. ✅ Trusted by 90+ Clients Across Multiple Platforms ✅ 5+ Years of Professional Experience Languages: C#, Java, C++, C, Python, JavaScript Technologies I am proficient in: React, Next.js, Redux, TypeScript, JavaScript, HTML, CSS, TailwindCSS, MUI, Formik, Storybook, Atomic Design, Firebase, RESTful API, Three.js custom carousel, marquee animations, Smooth Scrollbar JavaScript Plugin, Webpack, npm, yarn, No Code, Migration, Landing Pages, WP Blocks, Elementor, Redux Framework, WooCommerce, WooCommerce Stripe Payments Gateway, WordPress Website Development, E-commerce Development, Landing Page Development, PSD to HTML, Figma to HTML, Page Speed Optimization, Bug Fixing, Quick Fixes, API Integration.

Hi! I’m a Sydney-based Backend Developer (AEST) specialising in Python, Django/DRF, FastAPI and system integrations. I help startups, clinics and businesses build reliable APIs, automate workflows and fix complex backend issues quickly. I’ve worked across startups, enterprise systems and global platforms: building scalable APIs, optimising databases and integrating third-party services. My focus is always on clean architecture, performance and long-term maintainability. What I’m great at 1. Backend development (Django, DRF, FastAPI) 2. Building & optimizing REST APIs 3. Database design and performance tuning (PostgreSQL, MongoDB) 4. Workflow automation (Zapier, Make, custom Python scripts) 5. Integrations with booking systems, CRMs, payment gateways 6. AWS, DigitalOcean, Linux servers (deployment & maintenance) 7. Building secure auth systems (JWT, OAuth, sessions) 8. Writing unit/integration tests for reliable releases What you can expect: 1. Based in Sydney → smooth communication in AEST 2. Fast responses and clear communication 3. Production-quality code with documentation 4. Ability to work independently or collaborate with teams 5. Flexible for short-term gigs or long-term backend support Whether you need a backend built from scratch, an automation fixed, an integration implemented or a performance issue solved, I can jump in and deliver fast, reliable results. Let’s discuss your project, I can start immediately.