Hire the Best iOS Developers in California
Los Angeles, California
🅷🅴🆈 👋 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. 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. 🏆 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 → support 📱 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!
- iOS Development
- iOS
- iPad App Development
- Swift
- Mobile App Development
- Android
- Smartphone
- Android App Development
- Flutter
- JavaScript
- User Profile Creation
- User Authentication
- Firebase
- React Native
- Java
- Kotlin
- API Integration
- Mobile App
- App Development
- Hybrid App Development
San Francisco, California
I help startups and small businesses build, fix, and improve software products across mobile and full-stack engineering, bug fixing, AI implementation, Meta/WhatsApp integrations, payments, and product strategy. I bring more than 10 years of experience in Silicon Valley, applying high standards and best practices across the areas I specialize in. My background combines hands-on software engineering, entrepreneurship, and product thinking. I have built real products from the ground up, worked across mobile apps, backend systems, third-party integrations, AI-powered features, subscriptions, payments, and product direction, and I know how to balance speed with long-term quality. I am especially useful when you need someone who can quickly understand a product, identify what actually matters, and execute high-quality work without creating bigger problems later. My core areas of work: • Mobile & Full-Stack Software Engineering • Bug Fixing / AI-Code Rescue • AI Implementation • Meta Business / WhatsApp Integration • Payment Systems Implementation • Product Management & Strategy • Sign in / sign up & oauth flows What you can expect from me: • Clean, maintainable, and reliable implementation • Solutions designed to avoid technical debt and future headaches • Root-cause bug fixing instead of temporary patches • Strong product judgment, not just task completion • Clear communication and thoughtful execution • Careful attention to scalability, UX, and long-term maintainability I do not believe in rushing out fragile work that “works for now” but causes problems later. My goal is to deliver work that is solid, well thought through, and dependable, whether I am building something new, stabilizing an existing codebase, implementing an integration, or helping shape product direction. I am also well suited for messy situations, including buggy codebases, half-finished implementations, and projects affected by rushed AI or vibe-coded development. I can step in, understand the system quickly, fix what is broken, and leave systems in better shape than I found them. On AI specifically, I help clients implement AI in practical, product-focused ways, but I do not use AI for creative work or as a substitute for judgment, product thinking, or engineering quality. I use it where it is actually useful, while keeping the final thinking, review, architecture, and quality bar human-driven. Whether you need mobile or full-stack development, difficult bugs fixed properly, AI functionality added to a product, Meta or WhatsApp integration, payment systems implemented, or help making better product decisions, I focus on delivering high-quality work that solves the real problem and does not create new headaches down the line.
- iOS Development
- Mobile App Development
- Product Strategy
- Payment Integration Framework
- AI Implementation
- AI Agent Development
- Android App Development
- Firebase
- API Integration
- Back-End Development
- Full-Stack Development
- Flutter
- Software Development
- Software Debugging
- Bug Fix
- Code Review
- Performance Optimization
- AI App Development
- Product Management
- WhatsApp
Sacramento, California
I'm an iOS developer and UI/UX designer experienced in building products from the concept to completion. Whether you need help developing an entire app, a feature for an app, or just some UI/UX design, I'd love to help out. - Expert in Swift & SwiftUI for native, fast product development - Experience with branding and visual design for beautiful + performant projects - Experience building app backends in Swift for full stack development - Experience with other programming languages like Python, HTML, CSS, and Javascript for smaller tasks and scripts - Great communicator, flexible and quick to learn
- Apple Xcode
- iOS
- Swift
- UIKit
- ARKit
- Python
- JavaScript
- SwiftUI
- XCTest
- RealityKit
- UX & UI Design
- Figma
- Docker
- Git
- AWS Development
Santa Monica, California
Co-Founder & CEO of IT-Dimension, IT engineer, and project coordinator with deep hands-on expertise. Since 2007, I’ve led the delivery of 600+ custom software products and acted as a technical partner in 10+ SaaS ventures, taking them from idea to scalable success. In IT-Dimension we create software of any complexity to boost business in a wide range of industries: Industry 4.0 & Internet of Things (including Robotics + hardware development), Logistics/Transportation, Media & Entertainment, Healthcare/Wellness, Social Apps, AI Business Automation, GameDev, AR/VR, and far beyond. We offer deep and wide expertise in the following areas: 📌Strategic AI Adoption & Implementation Consulting 📌Web Backend: Node.js, NextJS, Express, Python, C++, .NET Core, ASP.NET Core, PHP, Go, Java, Kotlin 📌Web Frontend: Angular, React, Vue, Blazor 📌Mobile Development: Xamarin, Swift, Objective-C, C++, Kotlin, Java, Flutter, React Native, 📌Desktop Development: C#/.NET, WPF/Xamarin, C++, wxWidgets, Qt 📌UI/UX: User Interface Research, User Scenarios, User Interface Design, Usability Testing, Wireframing, Prototyping, UX Research, UX Writing, App design, web design, Visual Communication, UI/UX audit, custom graphics, brand identity 📌AR/VR: Unity, AR Foundation, AR Kit, AR Core, Kinect, Computer Vision, ML/AI 📌3D Modeling, Animation, Video Montage: Blender, Metahuman, Cinema 4D, Speedtree, DaVinci Resolve, Marmoset 📌Industrial Blockchain Sulutions: Web3.js, Solidity, C++, Go, Rust 📌Hardware Prototyping and Embedded: C, C++, Python 📌Cloud Platforms: AWS, Google Cloud, Azure, Heroku, Docker, DigitalOcean, Kubernetes, Terraform Partnering with IT-Dimension gets you: ❇️ In-depth Technology Consultation ❇️ Professional UI/UX Design ❇️ AI-first approach and AI integrations ❇️ Dedicated Software Development ❇️ Project Management ❇️ Quality Assurance ❇️ Deployment and DevOps Services ❇️ Software Maintenance and Enhancement Why choose IT-Dimension? 🔷 Dedicated multinational onshore/offshore teams (US, Europe located, different time zones) 🔷 16+ years of technological expertise 🔷 Swift and efficient project initiation 🔷 Deep-rooted expertise in 20+ domains 🔷 Personalized project handling 🔷 Innovative thinking for maximizing results
- iOS
- Web Development
- Mobile App Development
- UI/UX Prototyping
- AR & VR
- Mobile Game Development
- Xamarin
- Android
- Machine Learning
- Full-Stack Development
- JavaScript
- Web Application
- React
- Node.js
- Web Design
Mountain View, California
Senior iOS engineer with 15 years of native iOS experience, currently at Meta (Facebook App iOS) where I own performance metrics across billions of daily active users. My work spans metric-driven performance investigations, regression root-cause analysis, on-call production engineering, and AI-agentic tooling that automates performance analysis at scale. Before Meta: Senior/Lead iOS engineer at Amazon/Ring (hardware-connected consumer product), Citizen (safety app, TCA/SwiftUI architecture migration), Woosh (audio messenger, built from scratch), DraftKings (SDK development), and multiple startup teams over 15 years. I also build independently: Sky107 (sky107.app) is a solo-built FAA Part 107 exam prep app I shipped end-to-end -- modular Swift Package architecture, SwiftUI + TCA, Swift 6.1 with modern concurrency, live on the App Store. Deep expertise in Swift (2018-present), Objective-C (2011-present), UIKit, SwiftUI, TCA, performance optimization, and architecture for large codebases. I take on consulting work selectively -- 0-to-1 builds, architecture modernization, and performance engineering for teams that need iOS done right.
- iOS Development
- Apple Xcode
- iOS
- Objective-C
- Swift
- Native App Development
- Mobile App Development
- Firebase
- Software Architecture & Design
- SwiftUI
- UIKit
- Performance Optimization
- Software Architecture
- Firebase Cloud Firestore
- REST API
- Core Data
- CI/CD
- App Store Optimization
Lake Forest, California
I'm a Product & Interface Designer based in Southern California dedicated to making products that feel intuitive, powerful, and are highly functional. From websites to SaaS products I have worked on numerous projects primarily in Figma. My roots in design began almost 10 years ago as a young high school student building eCommerce websites with no-code tools like Shopify. My interest in design progressed around 5 years ago when I became a self-taught iOS developer and fell in love with Apple's design language. It was during this time that I developed my own design preferences and foundations - I ultimately believe that simplicity is the ultimate sophistication and embody this concept not just in my work, but in my daily life. My process is iterative, and I aim to find the most elegant solution to every problem.
- Figma
- UX & UI
- Product Design
- App Design
- Web Design
- Mobile App Design
- User Experience Design
- User Interface Design
- Prototyping
- Wireframing
How it works
Post a job for free Post a job
Tell us what you need. Create your own job post or generate one with AI then filter talent matches.
Hire top talent fast
Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.
Collaborate easily
Use Upwork to chat or video call, share files, and track project progress right from the app.
Payment simplified
Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.
Don't just take our word for it
“Upwork provides an umbrella-level of security. I can see a talent’s work history and ratings. I can hold payments in escrow. I can communicate through Upwork Messages instead of working through my email address.”
Kim Darling
Emerald Tiger
“Upwork is the best platform to hire skilled professionals when we're not looking for a full-time employee. All the companies in our portfolio use Upwork to find talent across a wide range of fields.”
David Merry
Kinetic Investments
“Our very specific requirements can be a challenge—With Upwork, we’re able to access a bigger community to ensure the success of our projects.”
Katja Krohn
Summa Linguae
Resources to help you hire

Cost to hire a iOS Developer
Explore typical iOS Developer rates and what businesses pay to hire top talent.

iOS Developer job description template
Get tips to write a job post that attracts qualified iOS developers.

iOS Developer interview questions
Top interview questions to help you hire the right iOS developers, faster.
Resources to help you hire

Cost to hire a iOS Developer
Explore typical iOS Developer rates and what businesses pay to hire top talent.

iOS Developer job description template
Get tips to write a job post that attracts qualified iOS developers.

iOS Developer interview questions
Top interview questions to help you hire the right iOS developers, faster.
How do I hire a iOS Developer in California on Upwork?
You can hire a iOS Developer in California on Upwork in four simple steps:
- Create a job post tailored to your iOS Developer project scope. We'll walk you through the process step by step.
- Browse top iOS Developer talent on Upwork and invite them to your project.
- Once the proposals start flowing in, create a shortlist of top iOS Developer profiles and interview.
- Hire the right iOS Developer for your project from Upwork, the world's largest work marketplace.
At Upwork, we believe talent staffing should be easy.
How much does it cost to hire a iOS Developer?
Rates charged by iOS Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.
Why hire a iOS Developer in California on Upwork?
As the world's work marketplace, we connect highly-skilled freelance iOS Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream iOS Developer team you need to succeed.
Can I hire a iOS Developer in California within 24 hours on Upwork?
Depending on availability and the quality of your job post, it's entirely possible to sign up for Upwork and receive iOS Developer proposals within 24 hours of posting a job description.
Find more freelancers
Nearby cities for iOS Developers
- CSS3 Developers in Santa Clara, CA
- CSS3 Developers in San Francisco, CA
- Functional Programmers in Los Angeles, CA
- Microsoft SQL Server Developers in Los Angeles, CA
- NoSQL Developers in Los Angeles, CA
- Manufacturing Designers in Irvine, CA
- Redis Developers in San Jose, CA
- Design Researchers in Long Beach, CA
- Relationship Managers in Roseville, CA
- Data Visualization Specialists in Los Angeles, CA
- Salesforce Experts in Carlsbad, CA
- Electronic Designers in San Diego, CA
- Human Centered Design Freelancers in Los Angeles, CA
- Product Designers in San Francisco, CA
- Articulate Specialists in San Diego, CA
- SquareSpace Developers in Long Beach, CA
Explore Related Skills in California
- iPhone App Developers in California
- App Developers in California
- PhoneGap Developers in California
- Windows App Developers in California
- React Native Developers in California
- PHP Developers in California
- Stripe Developers in California
- Flutter Developers in California
- Google Apps Developers in California
- Game Developers in California
- Bot Developers in California
- React.js Developers in California