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$100/hr
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I’m a senior full-stack developer with 13+ years of experience building web and mobile products for startups and growing companies. I specialize in React, React Native, Node.js, TypeScript, APIs, internal tools, and AI-powered workflows. I can help you build a new product, improve an existing app, fix messy technical foundations, or turn a vague product idea into something real and shippable. I’m especially useful when you need someone who can think beyond tickets. I’ve led engineering and product work in startup environments, so I care about speed, maintainability, user experience, and business outcomes. I can work independently, ask the right questions, and help you avoid wasting time building the wrong thing. What I can help with: - Web apps and SaaS products - React Native mobile apps - Backend APIs and integrations - Internal tools and admin dashboards - AI workflows and automation - Product/technical strategy for early-stage teams - Debugging, refactoring, and improving existing systems If you need a senior developer who can build quickly, communicate clearly, and help you make good technical decisions, I can help.
$67/hr
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As a CTO and co-founder with 20 years of experience, I specialize in transforming innovative ideas into operational realities. I excel in building MVPs for funded startups, delivering prototypes to production in just 6-8 weeks. My expertise also extends to rescuing AI-driven applications, addressing security concerns, and ensuring they are production-ready. Recent projects include successfully launching an AI course platform and a sports community site from concept to execution. I have a strong understanding of AI-generated codebases, identifying critical security vulnerabilities and vendor lock-in issues. Recognized as a Google Cloud Partner, I bring a wealth of knowledge to every engagement. If you are looking for a strategic partner who can navigate the complexities of technology and drive your project forward, I am ready to help you achieve your goals. Let's collaborate and make your vision a reality.
$100/hr
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Consultant - Operator - Integrator Innovation Synergy Ai Inc. Union Art Director & Propmaster Feature Film / Commercial IMDB Michael Joseph Bowen Previously Member IATSE481 & Art Directors Guild ADG800
$110/hr
$10K+ earned
Available now
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I'm a full-stack software developer with a keen eye for design and usability. I bring creativity and efficiency to projects through my expertise in web/mobile development, agentic development, backend design, and user analytics. React developer since I introduced it to Squarespace in 2014. Startup experience at all scales. CS at Georgia Tech.
$80/hr
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I am an AI-powered React Native Developer with 10+ years of professional experience building high-quality mobile applications for startups, healthcare companies, SaaS businesses, and enterprises. I specialize in developing secure, scalable, and high-performance cross-platform applications for iOS and Android with a strong focus on healthcare solutions and AI integration. Throughout my career, I have developed healthcare applications, telemedicine platforms, patient engagement systems, medical management solutions, AI-powered assistants, and enterprise mobile applications. My goal is not only to write clean code but also to build scalable architecture, improve application performance, and create outstanding user experiences. One of my key achievements has been optimizing existing mobile applications and improving overall performance by more than 30%, resulting in faster startup times, smoother UI, lower memory usage, and better user retention. ✦ What I Can Do • AI-powered mobile application development • React Native application development • Cross-platform mobile applications • Healthcare mobile applications • Telemedicine platforms • Patient portals • EHR & EMR integration • AI chatbot integration • AI healthcare assistants • Startup MVP development • Enterprise mobile applications • Performance optimization • Legacy app modernization • Code refactoring • Long-term product development ✦ Core Skills • React Native • React • TypeScript • JavaScript • Expo • Redux • Redux Toolkit • Zustand • React Query • React Navigation • Swift • Kotlin • Android • iOS ✦ AI Technologies • OpenAI API • ChatGPT • GPT Models • Claude API • Gemini API • LangChain • LlamaIndex • AI Agents • Prompt Engineering • RAG • NLP • Vector Databases • Pinecone • ChromaDB • AI Document Processing ✦ Backend • Node.js • NestJS • Express.js • Python • FastAPI • REST API • GraphQL • WebSocket • Firebase • Supabase ✦ Database • PostgreSQL • MySQL • MongoDB • Firebase Firestore • SQLite • Redis ✦ Cloud & DevOps • AWS • Azure • Google Cloud • Docker • Kubernetes • GitHub Actions • GitLab CI/CD • Fastlane • CodePush ✦ Healthcare Experience I understand the unique challenges of healthcare software, including security, privacy, compliance, and reliability. I have experience building: • Telemedicine applications • Patient management systems • Appointment scheduling • Prescription management • Medication reminders • Health monitoring apps • Apple Health integration • Google Fit integration • Bluetooth medical devices • Remote patient monitoring • AI healthcare chatbots • Medical dashboards • Hospital management systems ✦ API Integration • OpenAI API • Stripe • PayPal • Twilio • Firebase • Google Maps • Agora • Zoom SDK • WebRTC • OAuth • Auth0 • Clerk • FHIR APIs • HL7 ✦ Performance Optimization Performance optimization is one of my strongest skills. I improve rendering efficiency, reduce unnecessary re-renders, optimize API requests, implement caching strategies, minimize bundle size, reduce memory usage, and improve startup performance. Results include: • 30%+ performance improvement • Faster application startup • Lower memory consumption • Better battery efficiency • Improved FPS • Reduced API latency • Better App Store ratings ✦ Development Practices • Clean Architecture • SOLID Principles • MVVM • Agile • Scrum • CI/CD • Unit Testing • Integration Testing • Git Workflow • Code Review • Documentation ✦ Why Work With Me • 10+ years of experience • React Native specialist • Strong healthcare expertise • AI application development • Clean and maintainable code • Performance-focused development • Scalable architecture • Reliable communication • Fast delivery • Long-term collaboration • Business-oriented mindset ✦ Technical Keywords React Native, React, TypeScript, JavaScript, Expo, Redux, React Query, Node.js, NestJS, Express.js, Python, FastAPI, Firebase, Supabase, PostgreSQL, MongoDB, MySQL, GraphQL, REST API, AWS, Docker, Kubernetes, OpenAI, ChatGPT, Claude, Gemini, LangChain, AI Agents, RAG, NLP, Pinecone, ChromaDB, Stripe, Twilio, WebRTC, Agora, Apple Health, Google Fit, BLE, Push Notifications, Deep Linking, Fastlane, CodePush, OAuth, JWT, HIPAA-aware Development, Telemedicine, Healthcare Apps, EHR, EMR, FHIR, HL7. ✦ Let's Build Your Product Whether you need to build a new AI-powered healthcare application, improve an existing React Native app, integrate AI features, or optimize performance, I can help deliver a secure, scalable, and high-quality solution. I am committed to building products that provide excellent user experiences, strong performance, clean architecture, and long-term business value. I look forward to helping bring your ideas to life.
$60/hr
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With 5+ years of full-stack software development and deep expertise in LLM orchestration/agentic pipelines, I bridge the gap between frontier models capabilities and production-grade applications. Whether you need a launch-ready MVP or an enterprise-level cross-platform app, I build software that is robust, user-centric, and built to monetize. What I can help you build: -AI & Agentic Orchestration: Custom LLM pipelines, Autonomous Agentic Loops, Harness Engineering, Evals, Secure Ephemeral Sandboxes/Long Running Processes, RAG, and MoE routing integrated directly into your product. -Full-Stack Web Applications: High-performance, SEO-optimized web platforms optimized for conversions and robustness. -Cross-Platform Mobile Apps: Native-feel iOS and Android applications built for high retention and scale. -Scalable Infrastructure: Multi-stage CI/CD pipelines, and multi-platform cloud deployments (AWS, GCP, Vercel). -Testing & Quality Assurance: Comprehensive test suites (unit, integration, E2E) baked into the development pipeline. -Other: Complete payment system setup (Stripe/Mollie/MangoPay), secure authentication and cloud databases/distribution. My stack: -AI & ML: Python, Custom LLM Orchestration, Langchain, Firecracker VMs/E2B, OpenAI/Anthropic/Deepseek/Z.AI/Kimi... APIs, Vector Databases -Frontend & Mobile: Next.js, React, React Native / Expo, Tailwind CSS, TypeScript, Zod, Zustand -Backend & Cloud: Node.js, Python, Supabase, MongoDB, PostgreSQL, Serverless, Redis, S3/Cloudfront -DevOps & Infrastructure: Docker, Kubernetes, GitHub Actions, Sentry, AWS, GCP, Vercel, Nginx, Helm, Cloudflare -Testing & QA: Jest, Vitest, Playwright, Pytest, React Native Testing Library, Unit / Integration / E2E Automated Suites If you need a reliable developer who can dive into an existing repo, establish proper CI/CD and testing, or architect a complex AI product from scratch, reach out below.
$70/hr
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-Good at making code for IOS -Python Basic Programmer -With skill i can produce a website and mainly IOS apps - OS explorer -Nigerian
William James J.
$160/hr
100% Job Success
$200K+ earned
Offers consultations
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William James J. has worked .
I am a Silicon Valley–based entrepreneur and full-stack developer with more than 10 years of experience building software, launching products, and solving operational problems. From 2016 to 2017, I served as a director at a development company that created and launched its own startups. My work covered the full product lifecycle—from market research and validation to software development and go-to-market strategy. I have also worked as an independent developer, both on and off Upwork, supporting a range of U.S. corporations. In 2026, if you're not using agentic automation effectively, you're tech stack is already obsolete. The competitive advantage is agentic operations: AI systems that can plan, use tools, complete multi-step tasks, coordinate with other agents, and escalate important decisions to people. I help businesses upgrade existing products, technology, and workflows to capture the full operational value of AI. I can build, modify, and refine agentic systems using Hermes, LangChain, and custom orchestration frameworks—including specialized agents, multi-agent workflows, and supervisor agents that manage other agents. Choose me when you need more than an AI demonstration. I combine AI architecture, full-stack development, product strategy, and UX/UI design to create practical systems that integrate with your existing operation and are built for real-world use. Key Use Cases * Rapid AI prototype and MVP deployment * Custom AI-enabled websites and mobile applications * Workflow and repetitive task automation * Multi-agent systems and supervisor agents * CRM, cloud data, project management, HR, and business system integrations * Automated Git repository triage, issue creation, documentation, and release workflows * AI chatbots, internal copilots, and customer support automation * Data extraction, classification, reporting, and decision support * Legacy application modernization with AI capabilities * Human-in-the-loop systems for review, approval, and oversight Core Skills AI: Agentic AI, AI Agents, Multi-Agent Systems, LangGraph, Hermes, LLM Orchestration, RAG, Prompt Engineering, Custom Model Training and Fine-Tuning Development: Node.js, JavaScript, PHP, SQL, REST APIs, Webhooks, SaaS Development, AWS, Database Architecture, Mobile Development. Automation: Workflow Automation, API Integration, CRM Integration, Git Automation, AI Chatbots, Business Process Automation Product: UX/UI Design, MVP Development, Product Strategy, Technical Architecture, Go-to-Market Strategy An NDA-protected client had customer requests, CRM updates, and internal tasks spread across disconnected systems, forcing employees to repeatedly copy information and manually coordinate follow-ups. I designed an agentic workflow that interpreted each request, updated the correct records, created and assigned tasks, and routed exceptions to the appropriate team member for review. The result was a faster and more reliable operating process with fewer repetitive tasks, smoother handoffs, and clear human control over important decisions. Send me the workflow, system, or product you want to improve. I will identify the highest-value opportunities for agentic automation and build a practical path from your current technology to a reliable, production-ready system.
$60/hr
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10+ Years of Experience | Front-end Development Engineer Professional Summary Full-stack developer with 20+ years of experience and a strong focus on front-end engineering. Proficient in TypeScript, JavaScript, and modern frameworks including React, Vue, Next.js, and Three.js. Experienced with UI libraries such as Ant Design, Element-UI, Vant-UI, iView, and Shadcn-UI. Mobile & Cross-Platform Development Skilled in Uniapp, Taro, and React Native for building high-performance mobile applications across iOS and Android Backend & Cloud Integration Node.js + Express for API development and server deployment Integrated cloud services from Tencent Cloud and Alibaba Cloud: COS object storage, facial recognition, live streaming, and VOD Specialized Expertise WeChat Mini Programs, mobile apps, H5 solutions, and backend management systems Proven track record of delivering 50+ projects with on-time delivery and high client satisfaction What I Offer Clean, maintainable code with attention to performance and user experience Strong communication and collaboration skills to translate client needs into technical solutions End-to-end development from requirements analysis to deployment and maintenance
Surprise M.
$65/hr
$0 earned
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I am an Enterprise Mobile Architect, Tech Lead, and Platform Engineer with a proven track record of scaling high-concurrency systems. My production code runs on millions of active devices, driving mobile infrastructure for global giants like MTN and Toyota. I specialize in stepping into high-friction, complex React Native codebases to rescue stuck roadmaps, optimize performance, and unblock engineering teams. --- CORE EXPERTISE --- • React Native & Native Bridges: Performance optimization, custom native modules, and smooth New Architecture migrations. • Enterprise Platform Engineering: Legacy API integrations, robust security protocols, and high-concurrency data fetching. • Performance Engineering: Elimination of memory leaks, slashing Time-to-Interactive (TTI), and fixing Google Play/App Store crash rates (ANRs). • Tooling & Architecture: Open-source framework author with 15+ native NPM packages published to maximize development velocity. Whether your team needs an urgent production-grade code rewrite, a complex cloud-cost optimization, or an architectural audit, I deliver fixed-sprint solutions with absolute predictability.