Best California eCommerce App Development Companies

271 Companies-Rankings updated: August 20, 2026

Each agency undergoes DesignRush evaluation for professional expertise and genuine client satisfaction to assist your search. Some featured placements are paid.

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eCommerce
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United States × California ×

  • Closeloop Technologies

    Bringing awesome ideas to life

    Bringing awesome ideas to life

    App Development drives innovation at Closeloop Technologies. With our unique expertise, we deliver tailored mobile solutions that enhance user engagement and business growth. Expect collaborative, cutting-edge apps designed to meet your specific goals and elevate your digital presence...

    Top Services:

    • Software Development
    • Web Design
    • Mobile App Development
    • AI Development
    • Wearables
    • Show more
    Location
    Mountain View, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    31 Projects Listed
    View Profile
    4.9 4.9 (18)
    5.0 5.0 (4)

  • Koderspedia

    Transform Fast: Your App on iOS & Android Awaits!

    Transform Fast: Your App on iOS & Android Awaits!

    Through Koderspedia, clients gain a mobile app development company partner with a proven record—millions of downloads, funded launches, and seamless UI/UX. Our strategic thinking leads to remarkable outcomes in iOS, Android, and cross-platform app innovation. Submit your RFP today...

    Top Services:

    • Web Design
    • Web Development
    • Mobile App Development
    • Software Development
    • Logo Design
    • Show more
    Location
    Palo Alto, California
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    13 Projects Listed
    View Profile
    4.9 4.9 (18)
    4.9 4.9 (31)

  • eSEOspace

    Custom Website Design Company. Local US-based team! We Preserve & Optimize your SEO in the Process

    Custom Website Design Company. Local US-based team! We Preserve & Optimize your SEO in the Process

    Services We Offer: Software, Web Applications. We have 15+ years of experience designing and developing websites and software from scratch. Our background and emphasis in behavior science allows us to creatively design websites and software systems to convert. Call us at: (916) 866-7893 for a quote!...

    Top Services:

    • Web Design
    • Web Development
    • WordPress Website Design
    • eCommerce Development
    • SEO
    • Show more
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    32 Projects Listed
    View Profile
    4.9 4.9 (17)
    4.8 4.8 (23)

  • Simform

    Your Product Engineering & Gen AI Partner

    Your Product Engineering & Gen AI Partner

    Simform is a premier digital engineering company specializing in Product Engineering, Cloud, Data, Agentic AI, and Enterprise Platform Innovation. We help enterprises and high-growth ISVs build digital experiences and scalable, enterprise-grade products what work at scale...

    Top Services:

    • Software Development
    • Cloud Consulting
    • AI Development
    • Big Data Analytics
    • DevOps Consulting
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    1000 & Up
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    8 Projects Listed
    View Profile
    4.9 4.9 (16)
    4.8 4.8 (21)

  • ScalaCode Global Pvt. Ltd.

    Scalable Intelligence

    Scalable Intelligence

    ScalaCode is a leading AI software development company helping startups and enterprises build intelligent digital products. We specialize in Generative AI, AI Agents, LLMs, RAG, machine learning, cloud-native applications, and custom web and mobile software solutions...

    Top Services:

    • AI Development
    • Mobile App Development
    • Software Development
    • eCommerce Development
    • Show more
    Location
    San Jose, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed
    View Profile
    4.9 4.9 (14)
    4.3 4.3 (40)

  • GroupBWT

    We build tailored data platforms that help businesses collect, transform and turn data into insights

    We build tailored data platforms that help businesses collect, transform and turn data into insights

    GroupBWT is a consulting firm specializing in data management and the construction of data platforms. Our approach combines classical data warehousing with robust visualization tools, ETL processes, and business intelligence...

    Top Services:

    • Big Data Analytics
    • AI Development
    • Web Development
    • Software Development
    • Mobile App Development
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $45/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    14 Projects Listed
    View Profile
    4.9 4.9 (12)

  • Dedicated Developers

    Turning App Ideas Into App Businesses Since 2007

    Turning App Ideas Into App Businesses Since 2007

    We don't just build apps. We build app businesses that actually succeed, where 80% fail within their first year. For 17 years we've perfected what actually works, having launched 300+ successful apps, including one that hit 4+ million downloads in just 60 days with sub-$3 user acquisition...

    Top Services:

    • Mobile App Development
    • Web Development
    • Software Development
    • eCommerce Development
    • UI/UX Design
    • Show more
    Location
    San Francisco, California
    Number of Employees
    100 - 249
    Portfolios Count
    27 Projects Listed
    View Profile
    4.9 4.9 (10)
    5.0 5.0 (33)

  • SynergyTop

    SynergyTop is a custom software development company

    SynergyTop is a custom software development company

    SynergyTop is a healthcare-focused custom software development company offering healthcare platforms, EHR and FHIR integrations, patient portals, telehealth solutions, AI automation, web development, mobile apps and product engineering services...

    Top Services:

    • Web Design
    • eCommerce Development
    • UI/UX Design
    • Web Development
    • Mobile App Development
    • Show more
    Location
    San Diego, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    7 Projects Listed
    View Profile
    4.9 4.9 (10)
    5.0 5.0 (6)

  • ZERO NEGATIVE

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    Boutique studio creating tailored web experiences.

    Boutique studio creating tailored web experiences.

    Reach for the sky. We are Zero Negative. Your sidekick for big ideas. In a nutshell, Zero Negative is a small, boutique full-service design and development studio with a focus on creativity and close collaboration with clients. We make stuff - websites, web apps, interactive experiences, branding, and...

    Top Services:

    • Web Development
    • Web Design
    • WordPress Website Design
    • Branding
    • UI/UX Design
    • Show more
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    7 Projects Listed
    View Profile
    4.9 4.9 (10)
    5.0 5.0 (2)

  • Quantum IT Innovation

    Empowering Your Digital Future with Innovative IT Solutions

    Empowering Your Digital Future with Innovative IT Solutions

    At Quantum IT Innovation, our team excels in AI, Big Data, RPA, and Mobile App Development for iOS, Android, and Cross-Platform. We also offer expert SEO, PPC, and Social Media services to drive your business forward in the USA, UK, Canada, Ireland, UAE, Australia, India, & across the globe...

    Top Services:

    • Web Development
    • Social Media Marketing
    • SEO
    • PPC
    • IT Services
    • Show more
    Location
    San Clemente, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $10/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    101 Projects Listed
    View Profile
    4.9 4.9 (9)
    4.1 4.1 (113)

  • Probey Services

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    World's #1 Rated & Reviewed App, Website & Software Development Company

    World's #1 Rated & Reviewed App, Website & Software Development Company

    Specializing in iOS, Android, and Flutter app development, Probey Services builds custom solutions that grow with businesses. Backed by 12+ years of experience and a team of 320+ specialists, it has delivered 1,800+ projects and served 120+ clients, including Waze and the Cleveland Clinic...

    Top Services:

    • Mobile App Development
    • Software Development
    • Web Development
    • Web Design
    • WordPress Website Design
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $10/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    81 Projects Listed
    View Profile
    5.0 5.0 (110)
    5.0 5.0 (1)

  • Goji Labs

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    An Award-Winning Agency That Builds It Right

    An Award-Winning Agency That Builds It Right

    Goji Labs builds iOS and Android apps across 20+ industries, pairing strategy, design, and engineering under one roof. With 500+ products shipped, $1B+ raised by clients, and 12 years in business, it challenges the brief solving strategy and process gaps before they become technical issues...

    Top Services:

    • Mobile App Development
    • Software Development
    • UI/UX Design
    • AI Development
    • Web Design
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $149/hr
    Portfolios Count
    19 Projects Listed
    View Profile
    5.0 5.0 (91)
    4.9 4.9 (57)

  • Designli

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    Build software people actually pay for.

    Build software people actually pay for.

    Designli blends founder-level care, AI-empowered engineers, and hypothesis-driven development to deliver tailored cross-platform apps that scale. A leading app development firm with 13+ years of expertise, it has served clients, like Michelin, the Bank of London, and Earthlink...

    Top Services:

    • Mobile App Development
    • Software Development
    • Web Development
    • Web Design
    • UI/UX Design
    • Show more
    Location
    San Francisco, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $85/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    16 Projects Listed
    View Profile
    5.0 5.0 (79)
    4.9 4.9 (84)

  • Zazz

    Modern IT. Built Secure. Delivered Right.

    Modern IT. Built Secure. Delivered Right.

    Zazz uses an architecture-first, risk-aware, and outcome-driven development approach to produce 800+ cross-platform and native applications and accelerate time-to-value by 40%. Its services cover app development, design, audit, testing, modernization, and maintenance...

    Top Services:

    • Mobile App Development
    • IT Services
    • Software Development
    • Staff Augmentation
    • IT Compliance Solution
    • Show more
    Location
    San Francisco, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $45/hr
    Portfolios Count
    36 Projects Listed
    View Profile
    5.0 5.0 (76)

  • AppMakers USA

    Top US Mobile & Web App Development Agency

    Top US Mobile & Web App Development Agency

    AppMakers USA delivers native, hybrid, and cross-platform iOS and Android apps, covering everything from MVP builds to enterprise-scale platforms. As proof of its expertise, it has launched 400+ that supported 100M+ and helped raise $1B+ in funds for its clients across its 12+ years in business...

    Top Services:

    • Mobile App Development
    • UI/UX Design
    • AI Development
    • Software Development
    • Web Design
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    83 Projects Listed
    View Profile
    5.0 5.0 (67)
    4.9 4.9 (77)

  • BitsWits

    Where Exceptional Apps Are Just The Beginning

    Where Exceptional Apps Are Just The Beginning

    BitsWits guarantees app delivery in 4 weeks, building native iOS and Android apps alongside Flutter, React Native, AR/VR, blockchain, and mobile game solutions. With 10+ years in business, it has launched 1,200+ successful projects, served 100+ global clients, and won a Horizon Interactive Gold Award...

    Top Services:

    • Mobile App Development
    • Software Development
    • VR/AR
    • Blockchain
    • AI Development
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    12 Projects Listed
    View Profile
    5.0 5.0 (58)
    5.0 5.0 (11)

  • Cheesecake Labs

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    Enterprise Software & AI Engineering - Silicon Valley Rigor, Nearshore Speed

    Enterprise Software & AI Engineering - Silicon Valley Rigor, Nearshore Speed

    Founded in 2013 with roots at Uber, Cheesecake Labs builds custom iOS and Android apps spanning mobile, blockchain, IoT, and AI integration. With 350+ digital products delivered, 85+ awards and certifications, and clients including Skyroam and Tapcart, it is considered a top mobile app development firm...

    Top Services:

    • Mobile App Development
    • Software Development
    • AI Development
    • Staff Augmentation
    • Blockchain
    • Show more
    Location
    San Francisco, California
    Number of Employees
    50 - 99
    Portfolios Count
    13 Projects Listed
    View Profile
    5.0 5.0 (35)
    4.8 4.8 (83)

  • GenAI-Labs

    Helping Forward Thinking Companies Transform Digital Visions Into Value

    Helping Forward Thinking Companies Transform Digital Visions Into Value

    Award-winning USA-based Generative-AI consultancy developing the future of intelligent solutions. We revolutionize business with cutting-edge, responsive AI technologies delivered cost-effectively, and specialize in delivering projects on-time and within budget...

    Top Services:

    • AI Development
    • Web Development
    • Software Development
    • Mobile App Development
    • Blockchain
    • Show more
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    5 Projects Listed
    View Profile
    5.0 5.0 (34)

  • Diffco

    VerifiedVerified by the DesignRush team for authenticity and credibility.
    Your trusted AI software development partner

    Your trusted AI software development partner

    Diffco offers solutions that transform ideas into dynamic digital experiences. Precision and creativity combine seamlessly in our mobile innovation and software crafting solutions, delivering intuitive interfaces and robust functionality that elevate user engagement and business growth...

    Top Services:

    • AI Development
    • Software Development
    • Staff Augmentation
    • Mobile App Development
    • Web Development
    • Show more
    Location
    San Jose, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $110/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    31 Projects Listed
    View Profile
    5.0 5.0 (33)
    5.0 5.0 (24)

  • HDWEBSOFT

    Bring your vision to life

    Bring your vision to life

    HDWEBSOFT is a leading software outsourcing company in Vietnam, known for its high-quality services, affordable pricing, and reliable team. With over 250 experienced engineers and a decade of expertise, HDWEBSOFT has helped businesses of all sizes from around the world to develop and launch successful...

    Top Services:

    • Web Development
    • eCommerce Development
    • IoT
    • Mobile App Development
    • Software Development
    • Show more
    Location
    Pasadena, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    12 Projects Listed
    View Profile
    5.0 5.0 (31)
    4.7 4.7 (36)

  • Junkies Coder

    Top-rated Mobile Apps, AI/ML, Blockchain Development Company.

    Top-rated Mobile Apps, AI/ML, Blockchain Development Company.

    Junkies Coder is a leading technology solution provider across 15 countries and 50+ Rockstar Developers is our strength, We're specializing in web development, Top-rated Mobile App Development, and innovative solutions. Our experienced team is dedicated to delivering high-quality service and support to help...

    Top Services:

    • Mobile App Development
    • Web Development
    • WordPress Website Design
    • eCommerce Development
    • Digital Services
    • Show more
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    15 Projects Listed
    View Profile
    5.0 5.0 (29)
    4.9 4.9 (22)

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