Hire the Best OAuth Developers
in the United States

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Joe K.

St. Louis, Missouri

$130/hr
4.8
162 jobs

25+ years exp. - Full stack web developer, integrity is one of my core values. If you are looking for someone you can trust who has been building custom web solutions successfully for a long time, look no further. AI model integration, machine learning APIs, Stripe connect and custom Stripe checkouts, automated testing with AI. I build with the TALL stack ( Tailwind, Alpine, Livewire, Laravel ) and use Filmanetphp for rapid panel development. I've also built many custom WordPress plugins. AI augmented - I'm a claude code power user and Cursor is my IDE for fine tuning. I tend to have 2-3 AI coding assistant processes running at any given point in my workflow - for maximum productivity. I closely review generated code and pay tons of focus when/where needed. From one of my favorite reviews I've received here on Upwork - "I've never met such a skilled developer. I mean, we are talking world-class ladies and gentlemen! You are not going to discover a better developer anywhere else." -- Some recent projects; - Built a multi-tenant SaaS for scout troops, AI chatbot with API access to all the troops data like upcoming events, scout advancement progress, etc - Build an app that has a csv importer for companies, calls multiple APIs for gathering data about key people and uses LLM to generate targeted sales copy - Built an API for voice to text transcriptions to run on a local network machine - Setup local network open weights models for unlimited use without paying for tokens - Built a sales management system for an auto insurance dealer ( so his sales people could login, enter a sale, and commissions could also be tracked ) - Built a social network type app with courses and badges, a bit like linked in but focused on fast moving and fast shifting careers. - Built a platform for folks to promote their favorite business' and earn commissions. - Built a custom web application billing system for a contractor / sub - contractor service provider company that has dashboards for clients and vendors with billing and split payments so contractor earns platform fee. -- - "Joseph was kind, responsive, quick, direct, and receptive to feedback. If you have worked with other developers, you know how rare this is, and how important it is to find someone who truly cares about the quality of work they provide. He couldn't have been better to work with." "Joe is incredibly talented and an absolute pleasure to work with. He is our go-to guy for a variety of challenges and we have full confidence" "I really enjoyed working with Joseph. He was honest and direct with his communication. He didn't try to oversell his services. It was all about just getting the job done, doing it well, and communicating with me about what was going on throughout the whole process." - --- Ultimately, good web dev service consists of not only coding, but also translating your needs into solutions, communicating effectively, training you how to use the software, and giving you confidence along the way. I'm here for my clients to find their way through web dev projects. If there is anything I can't do, I'm happy to handle bringing in help on that specialty. I will be honest with you. My skills include but are not limited to; - Web App development - Laravel development - WordPress plugin development - Stripe integrations - Payment gateways - E-commerce - API integrations - AI automation I'm able to help with system design and database design, user experience, and optimization. I offer functionality consulting and can help prepare detailed requirements documents for larger projects. I do my best to provide ideas to solutions - when there is no clear path, a bit of research and some creativity can go a long way. Contact me to discuss your needs!

  • OAuth
  • Custom PHP
  • Stripe
  • jQuery
  • PHP
  • WordPress Plugin
  • WordPress
  • Laravel
  • API Integration
  • Web Development
  • Payment Gateway Integration
  • API Development
  • Plugin Development
  • API
Sanjay S.

Cupertino, California

$95/hr
4.9
286 jobs

I have experience in building custom software solutions tailor-made to your requirements. My skill-set spans multiple domains like financial, healthcare, eCommerce, advertising, education, life sciences, hotel/hospitality, media and entertainment, retail, real estate, sports and fitness, mobile and wireless, technology, non-profit and more industries. I use structured programming incorporating leading & tested frameworks, best programming practices, coding guidelines and standards. As the technology advances gradually and the programming landscape changes globally, inorder to accommodate the world's growing technological needs, I constantly evaluate the latest trends in the development community and try to constantly improve and upgrade my skills to provide my clients the best possible development solutions.

  • OAuth
  • .NET Framework
  • PHP
  • Database
  • Python
  • React
  • Angular
  • AJAX
  • ChatGPT
  • Google Cloud Platform
  • Facebook Development
  • Google Map Maker
  • Linux System Administration
  • Moodle
  • Open Source
Jeff T.

Vestavia Hills, Alabama

$150/hr
5.0
30 jobs

I've managed all aspects of technology which helps me get up to speed quickly on projects. I'm frequently called in on existing projects and have to figure out what's what. (Most documentation is non-existent or lousy.) I help non-technical product owners and stakeholders make technical decisions about their applications and "translate" for their developer(s). I'm a business owner and spent many years implementing accounting software, so I'm comfortable with the "business side" of applications (electronic payments, SEO, marketing, etc.) I currently manage several SAAS applications hosted in Azure and AWS. I specialize in DevOps, Cloud hosting and Authentication/Authorization (OIDC/OAuth/SSO). I've been working in software development for over 30 years, primarily with Microsoft tools (C#, SQL Server, ASP.Net, SQL Server, Entity Framework, etc.). Over the last decade, I've also work with Angular (a lot), React, PHP and Python. I have published mobile apps for both Android and iOS.

  • OAuth
  • Angular
  • Microsoft SQL Server
  • Firewall
  • C#
  • API
  • SQL
  • Microsoft Azure
  • Kendo UI
  • JavaScript
  • ASP.NET Core
  • Amazon Web Services
  • ASP.NET MVC
  • React
  • Transact-SQL
Jalen J.

Valparaiso, Indiana

$33/hr
5.0
29 jobs

Is your team wasting time on repetitive work that you know could be automated? I design scalable systems that eliminate manual work across your business so your team can focus on higher-impact, revenue-generating work. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 ▶︎ 𝗔𝗱𝘃𝗮𝗻𝗰𝗲𝗱 𝗪𝗼𝗿𝗸𝗳𝗹𝗼𝘄 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 Production-ready automations in 𝗻𝟴𝗻, 𝗠𝗮𝗸𝗲.𝗰𝗼𝗺, zapier and more, connecting CRMs, email, databases, payments, and internal tools. Clean logic, error-proofing, and built for scale. ▶︎ 𝗔𝗴𝗲𝗻𝘁𝗶𝗰 𝗔𝗜 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 Custom 𝗔𝗜 𝗮𝗴𝗲𝗻𝘁𝘀, chatbots, document processors, and lead qualification/generation flows using GPT-5.5, Claude Opus/Sonnet 4.8, Gemini 3.5, Qwen, DeepSeek-V4 and others. ▶︎ 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗦𝗰𝗿𝗶𝗽𝘁𝗶𝗻𝗴 From webhooks to REST APIs and oAuth, I connect platforms that don’t natively talk to each other, with Node.js/Python where needed. ▶︎ 𝗖𝗥𝗠 & 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗛𝘂𝗯𝗦𝗽𝗼𝘁 • 𝗦𝗮𝗹𝗲𝘀𝗳𝗼𝗿𝗰𝗲 • 𝗚𝗼𝗛𝗶𝗴𝗵𝗟𝗲𝘃𝗲𝗹 • 𝗣𝗶𝗽𝗲𝗱𝗿𝗶𝘃𝗲 • 𝗡𝗼𝘁𝗶𝗼𝗻 • 𝗔𝗶𝗿𝘁𝗮𝗯𝗹𝗲 • 𝗦𝘂𝗽𝗮𝗯𝗮𝘀𝗲 Clean data syncing, automated pipelines, dashboards, and reporting flows. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: n8n • Make • Python • Zapier 𝗔𝗜: GPT-5.5 • Claude Opus/Sonnet 4.8 • Gemini 3.1 Pro • Qwen 3.7 • DeepSeek-V4 • Kimi 𝗩𝗶𝘀𝗶𝗼𝗻/𝗠𝗲𝗱𝗶𝗮: Veo • GPT-Image • Sora • RunwayML • NanoBanana 𝗩𝗼𝗶𝗰𝗲: Vapi • Synthflow • Retell 𝗖𝗥𝗠: HubSpot • Salesforce • GHL • Pipedrive 𝗗𝗮𝘁𝗮: Supabase • PostgreSQL • pgvector • Airtable • Notion • Convex • Obsidian 𝗣𝗮𝘆𝗺𝗲𝗻𝘁𝘀: Stripe • QuickBooks • Plaid • Square 𝗗𝗲𝘃: Python • Node.js • REST APIs • Webhooks • Twilio 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁𝘀: LangChain, LangGraph, MCP, RAG, OpenClaw, Hermes Agent 𝗦𝗰𝗿𝗮𝗽𝗶𝗻𝗴: Playwright • Browser Use • Apify • FireCrawl • CUA ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ▶︎ Why Clients Choose Me 🟢 System level consulting, not just execution I help you understand the full problem, choose the correct architecture, and avoid expensive mistakes. 🟢 Strong engineering foundation I build systems that are maintainable, modular, and scalable, not fragile automations. 🟢 Ability to work across the stack From backend engineering to AI workflows and enterprise integrations. 🟢 Clear communication & reliability Fast responses, predictable delivery, and a problem-solving mindset. ▶︎ Let’s Build Something Scalable If you need a partner who can architect, develop, and deliver AI-powered automations, backend systems, or advanced data workflows, I’d be happy to discuss your project.

  • Artificial Intelligence
  • Python
  • JavaScript
  • n8n
  • Make.com
  • Zapier
  • C
  • PostgreSQL
  • Supabase
  • AI Implementation
  • AI Agent Development
  • Automation
  • Web Development
  • WordPress
  • Shopify
Ron S.

Grand Rapids, Michigan

$175/hr
4.7
39 jobs

I am a US-based Computer Scientist, Technical Architect, and AI Solutions Engineer with 30 years of experience. I am certified as Expert Vetted on UpWork (top <1% of all users), with 5-star rating, rave reviews, and 100% success score. ➤ Career Highlights I've worked with startups, Fortune 500 companies (Ford), and government agencies (CDC), and have held executive roles (CTO, CEO) at two successful startups doing millions in revenue with products reaching tens of millions of users worldwide. I also author and maintain open source libraries downloaded 25+ million times per month, used in production at GitHub and Microsoft. GitHub uses them in their core infrastructure and is one of my financial sponsors (more info below). ➤ What I Do I design and build software systems that scale — from architecture blueprints and database infrastructure to full production applications (backend, infrascruture, frontend, and more). My recent focus has been on AI-powered platforms, including LLM integration, AI agent development, multi-agent orchestration, and tool-calling pipelines using OpenAI, Claude, and open source models. ➤ AI & Agentic Development I build production AI systems — not wrappers around ChatGPT. Recent work includes multi-agent orchestration with tool-calling loops, MCP server development for document analysis, LLM-powered scoring and recommendation engines, and AI-assisted codebase analysis across 170k+ line codebases. I work daily inside Claude Code, OpenAI, and OpenRouter APIs. ➤ Why Technical Architecture Matters Most technical projects fail because they have a poor architecture blueprint — or none at all. Most developers aren't architects, and without the right foundation, even projects that make it to launch grind to a halt within months as technical debt makes it impossible to build further. I create full "bone structures" on the code, database, and server levels that establish patterns developers can build on confidently. By mapping out growth tracks early, we ensure the system can scale without endless rewrites. This is the difference between another great idea that stalls and a multi-million user success story. ➤ Open Source I wrote and maintain multiple open source libraries used worldwide, collectively downloaded over 25 million times per month. Highlights include the TypeScript compiler tools (~3M/month), node-html-parser (~20M/month), and node-html-markdown (~1.4M/month). GitHub itself financially sponsors this work, which is part of their core infrastructure. ➤ Working with Me I partner with startups, established companies, and enterprise teams who need expert-level architecture, AI integration, or full-stack development. I often deliver 2-4x faster than typical senior developers — clients regularly find the final cost beats offshore alternatives, because it's done right the first time and delivered faster. ➤ UpWork Stats ⁍ Expert Vetted (top <1%) + Top Rated Plus ⁍ $400k+ completed, 5-star rating ⁍ Rave reviews (most clients leave multiple reviews per project) ⁍ Almost all clients form long-term partnerships ➤ More Info ⁍ UpWork Reviews: See below ⁍ GitHub: nonara (pinned projects are all maintained by me) ➤ Keywords TypeScript, JavaScript, Node.js, Python, React, PostgreSQL, MySQL, AWS, Docker, Kubernetes, Electron, C#, .NET, Swift, Prisma, Redis, GraphQL, REST API, Next.js, FastAPI, Flask, Terraform, Pulumi, Shopify, AI Agent Development, LLM Integration, OpenAI API, Claude API, MCP Server, Model Context Protocol, Multi-Agent Systems, Tool-Calling Pipeline, RAG, Prompt Engineering, Context Engineering, Claude Code SDK, SWE-Agent, AI Agent SDK, Multi-Agent Orchestration, Web Scraping, Playwright, Browser Automation, Browser Extension Development, Chrome Extension, Cross-browser Extension, Solutions Architecture, Database Optimization, Infrastructure as Code, DevOps, CI/CD, Full-Stack Development, Technical Leadership, Code Rescue, ANTLR, CEF, Chromium Embedded Framework, ts-patch, TypeScript Compiler Plugin, TypeScript AST, TypeScript Compiler, Compiler Design, Language Server Protocol, LSP, Parser Development, BrowserView, Embedded Browser, Desktop Application, node-html-parser, node-html-markdown, V8 Engine, PostgreSQL V8, Custom Protocol, Reverse Engineering, Packet Analysis, WireShark Plugin, ArtNet, DMX, pcap, Database Forensic Recovery, IPv6 Scraping, Shopify App, Remix, Angular, PHP, Bash, OAuth, Auth0, SSO, JWT, WebRTC, SocketIO, Monorepo, Webpack, Vite, WordPress, n8n, Node-RED, Twilio, Stripe, GitHub Actions, GitLab CI, React Native, Firebase, pgvector, Embeddings, Vector Database, SaaS Architecture, Multi-tenant

  • API Development
  • Swift
  • Scripting
  • Reverse Engineering
  • Socket Programming
  • AWS Lambda
  • Linux
  • MySQL
  • JavaScript
  • TypeScript
  • React
  • Python
  • PostgreSQL
  • Node.js
  • Delphi
Andrey C.

Los Angeles, California

$35/hr
4.8
97 jobs

🅷🅴🆈 👋 Hi! I’m a veteran full stack developer, mobile app developer, and team lead leading a senior long-term team capable of taking products from idea → launch → scale → maintenance. I’ve been in professional software development for 25+ years and mobile app development for 17+ years, delivering scalable iOS Development, Android App Development, Flutter, React Native, and backend-driven platforms across startups, SaaS products, enterprises, and high-growth mobile ecosystems. Clients usually come to us when they need more than just coding - they need a technical partner who understands architecture, business logic, scalability, monetization, and long-term product growth. 🏆 Why Clients Choose Me ✔️ 25+ years as a full stack developer and software architect
 ✔️ 17+ years in mobile app development
 ✔️ 700+ mobile apps delivered across iOS, Android, Flutter & React Native
 ✔️ Expertise in native app development, hybrid app development, and scalable backend systems
 ✔️ Reduced crash rates by up to 70% and improved app performance by 50% on production apps
 ✔️ Built mobile platforms used by 5M+ users worldwide
 ✔️ Strong experience with Mobile App Improvement, Mobile App Bug Fix, and modernization projects
 ✔️ Long-term experience with startups, SaaS companies, enterprises, and Fortune 500 clients
 ✔️ Full-cycle delivery: architecture → development → deployment → scaling → suppo As a mobile application developer, ios developer, android developer, flutter developer, and full stack developer, I specialize in building high-performance native and cross-platform mobile apps used by millions of users worldwide. I work with native iOS development using Swift, SwiftUI, UIKit, and Objective-C, native Android development with Kotlin and Java, as well as Flutter, React Native, and hybrid app development for scalable cross-platform delivery. Over the years, I’ve helped build 700+ apps across fintech, healthcare, social networking, education, entertainment, e-commerce, IoT, and enterprise SaaS. My experience covers the full mobile app development lifecycle - system architecture, UI/UX implementation, backend development, API Integration, DevOps, deployment, scaling, optimization, and long-term product evolution. 📱 Native iOS & Android Development • Native iOS Development with Swift, SwiftUI, UIKit, Combine, Objective-C • Native Android App Development with Kotlin, Java, Jetpack Compose • Smartphone app optimization for performance, UX, and scalability • Clean Architecture, MVVM, VIPER, modular app structures • Device integrations: BLE, GPS, biometrics, camera, sensors, HealthKit, Google Fit • App Store & Google Play deployment pipelines • Multi-language apps with localization and accessibility support • Advanced performance optimization and memory management 🔁 Cross-Platform & Hybrid App Development • Flutter developer expertise for scalable cross-platform products • React Native development with custom native module integrations • Kotlin Multiplatform Mobile (KMM/KMP) • Shared business logic across iOS and Android • Adaptive UI systems and responsive mobile layouts • Cross-platform architectures reducing development time by 40–60% 🔧 Backend, API Integration & Infrastructure • REST API and GraphQL API Integration • Firebase, Node.js, PHP, and scalable backend services • Authentication systems, caching, offline sync, token management • SQLite, Room, Realm, Core Data • Push notifications: FCM, APNS, OneSignal • Real-time chat, geolocation systems, dashboards, and live data platforms • Backend-connected mobile ecosystems with scalable cloud infrastructure ⚙️ DevOps, CI/CD & Delivery • Fastlane, GitHub Actions, Bitrise, Firebase App Distribution • Automated testing and deployment pipelines • Beta testing, crash analytics, staged rollouts • CI/CD optimization for faster and safer release cycles • AWS and scalable cloud deployment workflows 📊 Analytics & Monetization • Firebase Analytics, Mixpanel, Amplitude, Google Analytics • In-app purchases, subscriptions, AdMob, Facebook Ads • Retention optimization and funnel analytics • Data-driven product iteration and growth optimization 🔌 Advanced SDK & Hardware Integrations • AVFoundation, CameraX, Core Bluetooth, Core Motion • Stripe, Twilio, Agora, Sendbird, Mapbox, OpenCV • IoT dashboards, BLE integrations, voice/video systems • Camera-heavy and sensor-based mobile applications 🌍 Industries Served • Fintech & Banking • Healthcare & Fitness • E-commerce & Retail • Smart Home & IoT • Education & E-learning • Social Networking • Travel & Hospitality • Entertainment & Media • SaaS & Enterprise Platforms ✅ Let’s Build a Mobile Product That Scales!

  • Flutter
  • Mobile App Development
  • Hybrid App Development
  • iOS Development
  • Android App Development
  • Mobile App
  • iPad App Development
  • App Development
  • Android
  • iOS
  • Smartphone
  • Swift
  • Objective-C
  • Firebase
  • Apple Xcode
  • API Integration
  • User Authentication
  • User Profile Creation
  • Kotlin
  • Mobile App Design

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