Hire the Best Bitcoin Developers in California

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Erik N.

Palm Desert, California

$100/hr
5.0
25 jobs

I'm a principle software engineer with over a decade of experience designing, developing, and deploying complex web applications and APIs. I have deep expertise in front-end, back-end, and DevOps, and love working across the full stack. Key skills I bring to the table: - Front-End Development: React, Next.js, Svelte, Vue.js, Nuxt.js, TypeScript, Material UI - Back-End & API Development: Node.js (Express, Nest), Python (Flask, Django, FastAPI), PHP (Laravel), Ruby on Rails - Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, CI/CD, TDD, Agile methodologies - Data & Machine Learning: Power BI, Tableau, TensorFlow, PyTorch, scikit-learn - Database Management: MySQL, PostgreSQL, MongoDB, DynamoDB, Supabase - Design & Copywriting Recent client work highlights: -Turning VibeCoded MVPs (i.e. Lovable, Base44, Replit) into fully functioning apps and websites -Fractional/Part-time CTO -Mobile Apps (React Native) -AI training, deployment and integrations - Google Chrome Extensions - Enterprise Next.js website (App Router) - Crypto Payment rails - Led teams of international developers I look forward to the opportunity to bring my expertise and passion to your project. Let's hop on a call and chat about how I can help!

  • Python
  • JavaScript
  • React
  • Node.js
  • ExpressJS
  • Firebase
  • HTML
  • CSS
  • MongoDB
  • TypeScript
  • Next.js
  • GitHub
  • API Development
  • Jest
  • Front-End Development
Vishal D.

San Francisco, California

$50/hr
5.0
43 jobs

Top Rated Plus | 100% Job Success I help organizations replace manual processes with intelligent, scalable systems built on Microsoft Power Platform. With 6+ years of hands-on experience across Power Apps, Power Automate, Dataverse, SharePoint, and Azure, I design production-ready solutions that reduce operational overhead, improve data visibility, and streamline decision-making. I don’t just build apps; I architect business systems. What I Help Businesses Achieve • Eliminate spreadsheet-based workflows • Automate approvals and document processing (AI OCR + routing) • Build structured case, project, and operations management systems • Consolidate fragmented SaaS tools into secure Microsoft ecosystems • Deploy scalable, governance-ready internal platforms Systems I’ve Built • Project Governance & Controls Platform (Oil & Gas) • AI-Powered Invoice Processing & Approval Workflows • AI-Powered Document Classification • Law Firm Case & Matter Management Systems • Leave Management System • Document Management Systems (SharePoint + Dataverse) Technical Expertise Microsoft Power Platform (Apps, Automate, BI, Virtual Agents) Dataverse & SharePoint Architecture Azure Integrations & Secure API Design AI Builder & Intelligent Document Processing Java / Spring Boot Backends React.js Frontend Applications Third-party integrations (Twilio, Shopify, Graph API, etc.) Why Clients Work With Me ✔ Architecture-first mindset (not quick fixes) ✔ Clean, scalable, maintainable solutions ✔ Strong communication & structured delivery ✔ Experience with healthcare, legal, energy & consulting firms ✔ Focus on measurable operational impact If you’re looking for a strategic Power Platform partner who understands both technology and business operations, let’s connect.

  • Microsoft PowerApps
  • Microsoft SharePoint Development
  • Microsoft SharePoint
  • Microsoft Power Automate
  • Business Applications Consultation
  • Java
  • Spring Boot
  • JavaScript
  • Microsoft 365 Copilot
Igor K.

San Diego, California

$90/hr
4.9
541 jobs

Senior WordPress Developer. Reliable and responsive. Result-oriented work. On time. "Top Rated Plus" Upwork premium freelancer, member of an Upwork PRO group. 14+ years skill in full-stack web site development (prototype, graphic design, front-end, back-end, SEO). Back end experience: PHP (WordPress, Laravel), C# (ASP .NET MVC, Web API, Entity Framework, Orchard, Kooboo, Umbraco). Front end experience: HTML5 / CSS3, SASS, LESS, Bootstrap 5, Html5 animation, JS, jQuery, AJAX, Json, Rest API, Angular 1-2-4, React.js, Vue.js, Node.js, Three.js. Other experience: Windows/Unix Server administration, Git, Azure, AWS and cloud solutions. In terms of WordPress can provide: ✔️ custom theme design or theme/template modification; ✔️ responsive HTML (will pass Google mobile-friendly test, work on any device and OS); ✔️ retina display support; ✔️ HTML5 animation if needed; ✔️ WordPress/Woo back end; ✔️ WordPress multisite and membership, BuddyPress, bbPress; ✔️ custom plugin development; ✔️ 3rd-party services and payment systems API integration; ✔️ SEO, make AMP compliant, setup CDN (Cloudflare); ✔️ support; ✔️ warranty. Great experience with: ✔️ e-commerce; ✔️ payment systems integration (PP, Stripe, Authorize.net and similar); ✔️ Google Maps API (custom design, clusters, routing, radius, speed/time/distances calculation, etc.); ✔️ responsive CRM and dashboards, high-traffic web-projects; ✔️ experience with Microsoft Power BI. Keep the warranty, always available, fast response and turnaround. === TAGS === WordPress Developer ; WordPress expert ; Fullstack developer.

  • WordPress
  • WooCommerce
  • PHP
  • WordPress Plugin
  • WordPress Development
  • Elementor
  • WordPress Theme
  • WordPress Security
  • WordPress Multisite
  • WordPress Customization
  • Web Design
  • CSS
  • JavaScript
  • HTML
  • Vue.js
Rizwan A.

Antelope, California

$40/hr
5.0
8 jobs

🚀 Mobile App Developer, 🤖 AI Mobile Apps & Integration, 🤖 AI Automation & Agents, 📱 Android & iOS, 🛠️ Flutter, ⚛️ React Native, 🎨 UI/UX Design Hi, I’m Rizwan — a Senior Mobile App Developer with over 10 years of experience delivering high-quality mobile applications. I've successfully built and launched dozens of Android and iOS apps for startups, enterprises, and individual clients. I specialize in creating high-performance mobile applications using Flutter, React Native, Kotlin, and Swift. Whether it’s a native app or a cross-platform solution, I focus on delivering seamless, scalable, and user-centric mobile experiences. Beyond traditional app development, I bring expertise in 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗺𝗼𝗯𝗶𝗹𝗲 𝗮𝗽𝗽𝘀, 𝗔𝗜 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻, and building intelligent 𝗔𝗜 𝗮𝗴𝗲𝗻𝘁𝘀 that work within your mobile apps — from smart chatbots and virtual assistants to automated workflows and contextual recommendations. What I Offer: 🚀 Mobile App Development – Full-cycle development for Android and iOS 📱 Native Apps (Kotlin & Swift) – Performance-first mobile apps 🛠️ Flutter – High-quality cross-platform development ⚛️ React Native – Fast, responsive hybrid apps 🤖 AI Integration – Chatbots, ML features, smart recommendations 🤖 AI Automation & Agents – Intelligent workflows, virtual assistants, and decision-making bots 🎨 UI/UX Design – Clean, modern, and user-friendly interfaces Let’s bring your app idea to life with smart, scalable, and future-ready tech. Message me today to discuss your project! ... .. . Mobile App Developer, Flutter App Developer, React Native Developer, Android App Developer, iOS App Developer, AI Mobile Apps, AI Integration in Mobile Apps, AI Automation, AI Agents, AI Virtual Assistants, Mobile App Automation, Kotlin Developer, Swift Developer, Cross-Platform App Developer, Chatbot Integration, Image Recognition App, Smart Recommendation App, App UI/UX Design, Upwork Mobile Developer, Machine Learning Apps, Custom AI Workflows, Voice Assistant Integration, Automation in Mobile Apps.

  • Native App Development
  • Mobile App Development
  • Flutter
  • React Native
  • Mobile App Development Consultation
  • AI Mobile App Development
  • Mobile App Improvement
  • Mobile App Bug Fix
  • Native App
  • Flutter Stack
  • Mobile App Design
  • UX & UI
  • UI/UX Prototyping
  • UI Graphics
  • Mockup
Kelly A.

Santa Barbara, California

$120/hr
5.0
4 jobs

Expert Salesman and Full Stack Architect | Experience Scaling to $1M+ Whether you need help in sales, or have development needs, with my experience in full stack development and building/operating 7 figure businesses, I can help stort, or optimize revenue. I specialize in the "Science of Sales," combining 15+ years of elite sales leadership I can turn your sales staff into a consistent revenue producing machine. If you are startup/early stage, I can use my experience with full-stack development to build the engines that turn inspiration into operational businesses. Whether you need a custom-built platform, a Shopify store, or an optimized sales force, I bridge the gap between your product and your revenue. What I bring to your business: I have built, operated, and managed several million dollar companies for myself and my clients. Having ranked in the top 5% of 600+ reps at Inogen, I don’t just consult, I speak from repeated success. My Hybrid Expertise: * Full-Stack Development: I design and deploy custom web/mobile apps, backend systems, and APIs. I specialize in Shopify architecture, automation, and building the CRMs/automation pipelines that make revenue predictable. * Sales Architecture: I engineer scripts using proven strategies, including persuasive questioning, consultative selling, finding the "why," and real world training that I have successfully implemented hundreds of time. I have trained and manage high-performance domestically and outsourced teams (I grew my first business from $0 to $1M in 18 months). * Business Infrastructure: From filing business licenses in tax-friendly states to building your web/mobile/Ai system and automation workflows, I set up the entire "business platform" so you can start generating revenue. The Result: A self-sustaining, system-driven business that can produce revenue without the need for constant founder intervention. Why work with me now? I have been using Upwork as a client for over 10 years and understand exactly what makes a project successful. I am currently offering reduced rates as I build out my Upwork portfolio. Industries: B2B, Medical Device, Legal Services, High-Ticket Consulting, and Direct Sales. Ready to scale or start your business journey? Message me with a brief overview of your current setup

  • React
  • Sales Management
  • React Native
  • High-Ticket Closing
  • TypeScript
  • Sales
  • Next.js
  • Business Development
  • Python
  • Sales Optimization
  • Telesales
  • NestJS
  • Sales Leadership
  • Node.js
  • Sales Coaching
  • MongoDB
  • PostgreSQL
  • Shopify Development
  • FastAPI
  • AWS Application
Corey R.

Temecula, California

$85/hr
5.0
50 jobs

Leading the web development and providing insights/ideas to drive software design success is the hallmark of my 15- year career. SKILLS • Modern JS Front-end Frameworks (React/Angular/Vue) + Typescript • Single-page-applications (SPAs) development using React, Redux, Context, React Hooks, and Typescript • Next.js proficient experience (SSR/SSG/Data fetching/API design/Routing architecture) • Integration of UI frameworks(Tailwind CSS/Chakra UI/Ant Design/Bootstrap/Material UI) + styled-components • RESTful API design, GraphQL/Apollo, and Node.js/Express/NestJs • AWS serverless structure with Lambdas, API Gateway, SNS/SQS, EC2/S3, Secret Manager, RDS/DynamoDB, Amplify, Cognito, ... • App hosting, CI/CD experience, and TDD(Unit testing/e2e testing) • Application development methods (Agile, Kanban, Waterfall), Project management tools (Jira, Atlassian, Asana, Notion), and Version control management (Git, Bitbucket, SVN) I am passionate about fostering cross-collaboration to support process improvement initiatives and best practices. I am excited to work with teams committed to challenging the status quo by identifying and evangelizing opportunities to improve engineering productivity and outcomes. In addition to my professional achievements, I possess a Bachelor of Science in Computer Programming from Northern Illinois University.

  • PHP
  • JavaScript
  • CSS
  • TypeScript
  • SCSS
  • MySQL
  • Node.js
  • React
  • HTML5
  • jQuery
  • ExpressJS
  • Git
  • Vue.js
  • Angular
  • Next.js

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