Our analysts identified the top outsourcing software development companies in California providing cutting-edge services that answer key business problems, from building technical software, designing websites or mobile apps to integrating operating systems and more. Narrow down your search by team size, budget, reviews and more to select the best developer for your company’s needs.

Best California Outsourcing Developers

4 Companies - Rankings updated: August 20, 2026

DesignRush assesses agencies using expertise standards and verified client experiences to help you make better decisions. Certain agencies have paid placements.

United States × California ×
  • A Canada-Based Mobile App Development Agency for Scalable, Beautiful Apps

    AI-Powered Web & Mobile App Development Company...

    Location
    San Francisco, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $20/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    41 Projects Listed

    iTechnolabs Services

    • Mobile App Development
    • Software Development
    • VR/AR
    • AI Development
    • IoT
    • Blockchain
    • eCommerce Development
    • Software Testing
    • DevOps Consulting
    • Web Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • P&G
    • Speclopedia
    • Norvell
    • Ithaca Guide
    • Match Families
    • Betternow
    • Lanzzin - Freelance Marketplace
    • Ohmyfrench - Training from French Teachers
    • Spire Social - Share Data on Social Networks
    • RaiseYourIQ - Check Mental Capability
    Data sourced from the agency's DesignRush profile

    iTechnolabs Reviews & Testimonials

    • Ashish Sharma
      Ashish Sharma Digital marketing Team lead at TOXSL TECHNOLOGIES FZCO
      5.0

      Mobile App Development Review from Ashish Sharma

      We worked with itechnolabs regarding our mobile app development for the addition of the new functionalities to our user app and after getting in touch with different services providers we chose itechnolabs as our development partner maily due to their understanding skills and free behavior from the very beginning they consulted us very genuinely and also provide their opinions regarding the new fictionalities so they look real to us with their skills so we hired them and startedthe work on the new fictionality as we completed the project it was on time and fulfiling our al desire which we imagined whne we onboard the itechnolabs to this project. They handed it very wisely and never provided any excuses regarding any of our cincern. So, at the end tghey did a very commendable job and helped us a lot so highly recommend itechnolabsto everyone who is going through this review.

    • Recoer Thomas
      Recoer Thomas Research Assistant at Unimarkt Handelsgesellschaft m.b.H. & Co. KG
      4.0

      Translation Services Review from Recoer Thomas

      Working with iTechnolabs was a smooth and seamless experience. Their team of developers is professional and efficient, and they delivered high-quality Magento Development services that met all of our expectations. We couldn't be happier with their work. Overall, I had a fantastic experience working with this Magento Development company. They are truly experts in their field, and I would not hesitate to work with them again in the future.

    • Hetter Loane
      Hetter Loane CEO at Food and Beverage Specialist
      5.0

      Mobile App Development Review from Hetter Loane

      I was extremely impressed with iTechnolabs' Food and Beverages app development services. Their team was highly skilled and knowledgeable, and they were able to deliver a high-quality product that met all of my requirements. They were also very responsive and communicative throughout the entire process, which made it easy to stay informed and involved in the project. The final product was delivered on time and within budget, and it was exactly what I was looking for.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • 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...

    Location
    San Clemente, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $10/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    101 Projects Listed

    Quantum IT Innovation Services

    • Web Development
    • Social Media Marketing
    • SEO
    • PPC
    • IT Services
    • Mobile App Development
    • AI Development
    • Digital Marketing
    • Software Development
    • Web Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • David
    • Karmel
    • Jevon
    • Luke
    • Rajitha
    • Alfred
    • Gilbert
    • Erik
    • Christopher Samdeo
    • Mehernaz Emadi
    Data sourced from the agency's DesignRush profile

    Quantum IT Innovation Reviews & Testimonials

    • Lorena Iaut
      Lorena Iaut Obstetrician and Gynecologist at Lorena Laut
      5.0

      Digital Marketing Review from Lorena Iaut

      We have had a great experience working with Quantum IT Innovation for our digital marketing needs. Their team is professional, responsive, and truly understands how to position a healthcare brand effectively online. We've seen noticeable improvement in our digital presence and engagement. Highly recommend their services to anyone looking for reliable and result-driven marketing support.

    • Brigitte Brünjes
      Brigitte Brünjes Owner at Hogasearch
      5.0

      Digital Marketing Review from Brigitte Brünjes

      Quantum IT Innovation played a key role in strengthening HOGASEARCHs digital presence through strategic digital marketing and SEO services. Their team delivered creative content, consistent planning, and visible growth in engagement and search rankings. Highly professional and results-oriented.

    • SAM NAJIBI
      SAM NAJIBI CEO at MBSS Security Services
      5.0

      Digital Marketing Review from SAM NAJIBI

      Quantum IT Innovation has been a game-changer for MBSS Security. Their digital marketing strategies helped us boost our local visibility, generate leads, and build a strong online presence. Highly professional and results-driven team truly appreciate their support!

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • A WooCommerce Development Agency

    CoSpark, a leading WooCommerce development agency with 15+ years of experience, specializes in crafting exceptional eCommerce solutions, generating over $300 million in annual revenue for clients. Renowned for full-stack development, customizations, and ongoing maintenance...

    Location
    Irvine, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $200/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    5 Projects Listed

    CoSpark Services

    • eCommerce Development
    • Web Development
    • WordPress Website Design
    • Software Development
    • Web Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Heggerty
    • Brooklyn Robot Foundry
    • Mike's Organic
    Data sourced from the agency's DesignRush profile

    CoSpark Reviews & Testimonials

    • Cynthia Astle
      Cynthia Astle Review from Google
      5.0

      Cynthia Astle's Review Sourced from Google

      CoSpark was a true lifesaver for our online journal with a bug in its signup code. Heral Patel was prompt, courteous, helpful and economical. The signup now works great! We will be using CoSpark again.

    • Jonathan Lopez
      Jonathan Lopez Review from Google
      5.0

      Jonathan Lopez's Review Sourced from Google

      A few years ago, I reached out to Heral for custom Mailchimp newsletter development based on AnnexCore's great online reviews in addition to their Mailchimp expert accreditation. He was a pleasure to work with, very professional, and even finished the job early with no revisions necessary. I refreshed our newsletter a couple weeks ago and then contacted Heral to execute the project. He responded to me right away, started the task immediately and completed the project ahead of schedule once again. This design was slightly more complex than the previous one, so Heral consulted me on a few issues to remedy a minor issue I had with the design. It was another great experience working with Heral and Annexcore. I recommend AnnexCore and Heral for any email marketing consulting and will definitely be using them in the future.

    • Support Contact
      Support Contact Review from Google
      5.0

      Support Contact's Review Sourced from Google

      AnnexCore was fantastic to work with and produced an outstanding marketing campaign from start to finish. The service and response time was instrumental in completing our project on time considering our tight time frame. I will be collaborating in the future with AnnexCore and recommend them strongly. Pat M Red Capture

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Full-Service E-commerce Development Company

    An ecosystem for B2B/ B2B2C websites on multiple platforms with robust technology and a customer-oriented mindset...

    Location
    Los Angeles, California
    Number of Employees
    250 - 499
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    10 Projects Listed

    BSS Commerce Services

    • eCommerce Development
    • Web Development
    • Software Development
    • Web Design
    • UI/UX Design
    • IT Services
    • Mobile App Development
    • Software Testing
    • Cybersecurity
    • WordPress Website Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • PixePrint
    • OlogsBabyArtikel
    • HoolaHoola
    • Dippytee
    • Screenshotsinc
    • Frameless Hardware Company
    • Skandiastyle
    • Café Du Cycliste
    • Parfymonline
    • Supersports Vietnam
    Data sourced from the agency's DesignRush profile

    BSS Commerce Reviews & Testimonials

    • Anthony G
      Anthony G Review from Google
      5.0

      Anthony G's Review Sourced from Google

      It's the best app to sell Multichannel on Shopify. Otherwise you would have to pay 2000$ for Shopify PLUS. Support and Features are Great! Thats a company you want to work with together as a B2B seller! Especially thank you Jonas!

    • James Batson
      James Batson Review from Google
      5.0

      James Batson's Review Sourced from Google

      Great company with excellent customer service. Helped us solve an issue on our Magento 2 website, highly recommend to anyone looking for Magento plugins or development.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews

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