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.

United States × California × Outsourcing Software Development × Retail × $25,000 - $50,000 × Clear Filters
  • Diffco

    Verified Verified by the DesignRush team for authenticity and credibility.

    Your trusted AI software development partner

    When startups and enterprise clients need AI-driven software or staffing, Diffco delivers custom mobile, web, and IoT applications backed by 17 years of delivery experience. San Jose-headquartered, the team has built solutions for American Express, Starbucks, Whole Foods, and Mars, using React, Node.js...

    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

    Diffco Services

    • AI Development
    • Software Development
    • Staff Augmentation
    • Mobile App Development
    • Web Development
    • eCommerce Development
    • IoT
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Mars
    • Food Rocket
    • FlashGrid
    • Nokia
    • Instreamatic
    • Quire
    • Legionfarm
    • Latoken
    • Genius One
    • Shift
    Data sourced from the agency's DesignRush profile

    Diffco Reviews & Testimonials

    • Oleg Sotnikov
      Oleg Sotnikov CEO at AppMaster
      5.0

      AI Development Review from Oleg Sotnikov

      Diffco built a complex, production-grade AI agentic system and backend for our client's fintech platform owning architecture, AI/ML components, and AI agents in a security- and compliance-sensitive environment. They delivered on time and within budget, communicated proactively, and operated like part of our own team, taking ownership and suggesting better solutions throughout. Deep AI/ML and senior backend expertise. We'd happily work with them again.

    • Julia Platova
      Julia Platova VP Strategic Partnerships at OVA Solutions
      5.0

      Mobile App Development Review from Julia Platova

      We partnered with Diffco for a comprehensive software development project aimed at delivering a mobile application and backend system for our client. The goal was to create a seamless, secure, and scalable solution within a 4-month timeline and $50k-$200k budget. Diffcos team was highly professional from start to finish. They handled everything: UI/UX design, backend architecture, API integration, and deployment. After the launch, they continued to support us with maintenance and performance optimization. The application received positive feedback and has proven stable and scalable. Were highly satisfied with Diffcos expertise, commitment, and ability to deliver real results.

    • Max Shmatkov
      Max Shmatkov Manager at Centerligh
      5.0

      Mobile App Development Review from Max Shmatkov

      As an advantage of working with this company I’d like to note that their Agile development method is amazing! Diffco earned my trust through such approach and the team’s professional attitude.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Where Exceptional Apps Are Just The Beginning

    When enterprises need custom apps across healthcare, fintech, and ecommerce, BitsWits delivers mobile and web platforms using React Native, Flutter, Swift, and blockchain stacks. The Houston-based studio handles iOS, Android, and cross-platform builds with in-house AI, IoT, and AR/VR capabilities. Clients...

    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

    BitsWits Services

    • Mobile App Development
    • Software Development
    • VR/AR
    • Blockchain
    • AI Development
    • Staff Augmentation
    • Web Development
    • Wearables
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • FitNow
    • Wisu
    • Soul Scribe
    • Grease Monkey
    • Beats
    Data sourced from the agency's DesignRush profile

    BitsWits Reviews & Testimonials

    • Sydney Malone
      Sydney Malone Implementation Engineer at Translucent Services
      5.0

      Mobile App Development Review from Sydney Malone

      With the development of our Mobile App, BitsWits performed a fantastic job. Their team was quick to respond and produced a great application that runs smoothly on all platforms. We are quite happy with the result.

    • Benson Sung
      Benson Sung Founder at D2C Design
      5.0

      Mobile App Development Review from Benson Sung

      They created a Mobile app for Medical services, and patient management has changed greatly as a result. The app works well with our current systems, is safe, and is simple to use. Their team produced a top-notch product on schedule while paying close attention to our unique requirements. We are really pleased with their work and heartily recommend BitsWits to anyone in need of app development services.

    • Steve Garry
      Steve Garry Senior 3D Animator at Treehouse Digital
      5.0

      Mobile App Development Review from Steve Garry

      The outcomes of our collaboration with BitsWits to develop an Online Food delivery app were outstanding. Real-time tracking is integrated into the app, which makes it easy to use and has significantly enhanced our customer support. Their development staff was quick to respond and took care of all of our requests. We couldn't be more pleased with the result!

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

    Simform Services

    • Software Development
    • Cloud Consulting
    • AI Development
    • Big Data Analytics
    • DevOps Consulting
    • IoT
    • eCommerce Development
    • UI/UX Design
    • IT Services
    • Managed Services
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Sony Music (EMI)
    • Pepsico
    • Zep Inc
    • Intralinks
    • Nxt-ID
    • FreeWire Inc
    • Accent Inc
    • Mission Rabies
    • DoggyBnB
    • Drizzle Labs
    Data sourced from the agency's DesignRush profile

    Simform Reviews & Testimonials

    • Andrew Muroff
      Andrew Muroff CEO at Strainprint Technologies Ltd.
      5.0

      Software Development Review from Andrew Muroff

      We worked with Simform for many years ongoing software development on our core product, the Strainprint mobile outcomes tracker for medical cannabis patients. We have only positive things to say about their work product and attention to detail. We highly recommend them and will work with them again.

    • Robel Yemane
      Robel Yemane Head of Engineering at Privilee
      5.0

      Software Development Review from Robel Yemane

      I've been working with Simform for over six months now. The engagement began with bringing our subscription management platform in-house, and we've since expanded the partnership to other projects due to their broad skill set and consistent reliability. They've gone the extra mileeven over weekends and public holidaysto help us move faster when needed. Communication and project management have been excellent, with any issues swiftly addressed. It genuinely felt like Simform was invested in our success. Having worked with similar firms throughout my career, I can confidently say Simform stands out and comes highly recommended.

    • Russ Makhauri
      Russ Makhauri Front-End Engineer at Midas
      5.0

      Software Development Review from Russ Makhauri

      We worked with Simform to hire a front-end engineer for our SaaS platform. The process was well-organized, and their team was professional, responsive, and efficient. They quickly identified a candidate who met our technical requirements and ensured a smooth onboarding process. Simforms communication and project management were strong throughout the engagement. They were proactive in addressing feedback and remained flexible in adapting to our needs. While there is some room for improvement in developer vetting and quality assurance, their overall service was excellent. For companies looking to scale their development teams efficiently, Simform is a reliable partner. Their structured approach, responsiveness, and commitment to client satisfaction make them a great choice. We would recommend them without hesitation.

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

    EffectiveSoft is an AI-enabled product engineering company focused on digital products and enterprise systems. We combine software engineering, UX expertise, and AI capabilities to help companies build products that can adapt to changing requirements, integrations, and growth...

    Top Services:

    • Software Development
    • Mobile App Development
    • Big Data Analytics
    • AI Development
    • ERP Consulting
    • Show more
    Location
    San Diego, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    29 Projects Listed

    EffectiveSoft Services

    • Software Development
    • Mobile App Development
    • Big Data Analytics
    • AI Development
    • ERP Consulting
    • IoT
    • Cloud Consulting
    • DevOps Consulting
    • UI/UX Design
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • CITY INDEX
    • TruBridge
    • CNote
    • Plato
    • Intelon Optics
    • InCheq
    • Nissin Foods
    • Soutron Ltd.
    • BullionRock
    • InContinuum
    Data sourced from the agency's DesignRush profile

    EffectiveSoft Reviews & Testimonials

    • Alex Silverstein
      Alex Silverstein Chief Technology Officer at Unified Digital Group, LLC
      5.0

      Software Development Review from Alex Silverstein

      Over the past 13 years, I’ve valued the opportunity to work alongside this team. Their expertise played a central role in my company’s success, and I’ve come to rely on them for their consistency, attention to detail, and thoughtful approach.

    • Philipe Araujo
      Philipe Araujo Business Analyst and Quality Engineer at Motive Retail
      4.8

      Software Development Review from Philipe Araujo

      We have had a highly positive experience utilizing EffectiveSoft's staff augmentation services for our Business Analyst and Quality Engineer needs. The professionals provided were not only highly skilled and knowledgeable but also integrated seamlessly with our existing team, requiring minimal ramp-up time. Their expertise in their respective fields significantly enhanced our project's efficiency and overall quality. We confidently recommend EffectiveSoft for any organization seeking top-tier talent to augment their teams and drive successful project outcomes.

    • Sasja Ihn Christensen
      Sasja Ihn Christensen Senior Director, Head of Digital Business Development at MAERSK BROKER
      5.0

      Software Development Review from Sasja Ihn Christensen

      Maersk Broker is pleased to provide this reference letter for EffectiveSoft, our trusted collaborator for complex web projects. From the initial stages of our projects, the team at EffectiveSoft demonstrated a deep understanding of our requirements and have been apro-active part of any problem-solving process. The team of offshore developers has been well-run through their lead developer, and we have only experienced a professional approach to our projects, as well as a pleasant and trust-based collaboration = between all members in the EffectiveSoft team and our own team. EffectiveSoft has furthermore proved to be highly flexible, adapting to our evolving needs and delivering reliable results under shifting circumstances and shifting priorities. They have furthermore been very quick to find and add the necessary resources to the team when needed, and we have only experienced professional and highly skilled consultants. This has also made on-boarding into projects faster and more efficient. In conclusion, it has been a pleasure working with EffectiveSoft, and I have no doubt that they will continue to be an asset to any collaborators in the future, adding value through their professionalism, dedication and understanding of business needs.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Certified E-Commerce Development Company

    Certified E-Commerce Development Company...

    Top Services:

    • eCommerce Development
    • Web Development
    • IT Services
    • Web Design
    • Mobile App Development
    • Show more
    Location
    San Francisco, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    16 Projects Listed

    Dinarys Services

    • eCommerce Development
    • Web Development
    • IT Services
    • Web Design
    • Mobile App Development
    • Staff Augmentation
    • Digital Strategy
    • Digital Services
    • Software Development
    • IoT
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Aroma Kava
    • LastBid
    • Budu Sushi
    • Magento 2 Migration
    • Rite Space
    • Bookbreakrs
    • Can
    • Vivat
    • Udifo
    • ServisBook
    Data sourced from the agency's DesignRush profile

    Dinarys Reviews & Testimonials

    • André Schörnig
      André Schörnig Marketing-Manager at myfelt GMBH
      5.0

      eCommerce Development Review from André Schörnig

      We have been working with Dinarys on our Shopify store for quite some time, and the experience has been great. From the very beginning, communication was clear, efficient, and reliable. The Dinarys team consistently delivered detailed proposals, stuck to agreed timelines, and offered well-structured solutions tailored to our needs. Their technical expertise is impressive, but what really sets them apart is their proactive attitude and genuine commitment to our project. Whenever we had questions or changes, they responded quickly and constructively. Its a true pleasure to work with a partner who feels like an extension of our own team. Highly recommended!

    • Nissrine Kohen
      Nissrine Kohen Sr. Backend Shopware Developers at H1 Webdevelopment
      4.5

      Web Development Review from Nissrine Kohen

      Weve been working with Dinarys for quite some time now, mainly collaborating on Magento and Shopware development projects. Their developers consistently show solid technical expertise and a good understanding of our expectations and workflow. Communication is generally smooth, and response times are quick. Whenever issues arise, the team is open to feedback and acts quickly to improve. Over time, weve seen a positive evolution in their proactiveness and alignment with our teams way of working. They are flexible and collaborative, and its clear that they genuinely aim to build long-term partnerships. For the quality delivered, we feel the pricing is fair and transparent. All in all, weve been satisfied with our cooperation and would recommend Dinarys as a development partner, especially for companies looking for experienced backend developers in Magento and Shopware.

    • Andrew White
      Andrew White Review from Google
      5.0

      Andrew White's Review Sourced from Google

      I'm wasn't in the German office, but i had experience of communication with this company! I can say that it leaves the warmest feelings in the my heart! Guys you are the best!

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Modern Times, Modern Measures. We Call It the Wizeline Way.

    Wizeline is a recognized global leader for on-point, outsourced design and technology services. Headquartered in San Francisco, the firm provides optimal data leverage, new market capitalization, product development, and much more. More than 10 million people use Wizeline products every day...

    Top Services:

    • Software Development
    • Mobile App Development
    • AI Development
    • Web Design
    • UI/UX Design
    • Show more
    Location
    San Francisco, California
    Number of Employees
    500 - 999
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $25,000 - $50,000

    Wizeline Services

    • Software Development
    • Mobile App Development
    • AI Development
    • Web Design
    • UI/UX Design
    • IT Services
    • Product Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Fox Networks Group
    • USA Rugby
    • WSJ
    • Banco Base
    • Mastercard
    • Coppel
    • Shape Security
    • TWG Dover
    • Digital Arts Network
    • Barron's
    Data sourced from the agency's DesignRush profile

    Wizeline Reviews & Testimonials

    • David Brown
      David Brown Review from Google
      1.0

      David Brown's Review Sourced from Google

      HORRIBLE, company -- must avoid - management has zero ethics, constantly lies through teeth, noncommittal , doesn't give a straight answer to anything. Avoid!

    • Michael Noga
      Michael Noga Review from Google
      5.0

      Michael Noga's Review Sourced from Google

      I thought this was crunchbase inc? Wizeline? But same type of business. Well as long as I know it is real but if so then the name I have is my own creation. It is called crunchbase inc

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Your AI-Driven Software Development Partner

    Savvycom is an AI-driven software development and IT consulting company founded in 2009, helping enterprises design, build, and modernize digital systems that deliver measurable business outcomes. Recognized as one of Vietnams Top 10 Digital Technology Companies, Savvycom partners with organizations...

    Top Services:

    • Mobile App Development
    • Software Development
    • Web Development
    • IT Services
    • AI Development
    • Show more
    Location
    Laguna Beach, California
    Number of Employees
    500 - 999
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    9 Projects Listed

    Savvycom Services

    • Mobile App Development
    • Software Development
    • Web Development
    • IT Services
    • AI Development
    • Blockchain
    • Software Testing
    • Staff Augmentation
    • Managed Services
    • Cybersecurity
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • KB Bank
    • Citeco.
    • Capsikin
    • Path.
    • North America & Europe: TaylorMade
    Data sourced from the agency's DesignRush profile

    Savvycom Reviews & Testimonials

    • Nguyên Ngọc
      Nguyên Ngọc Review from Google
      4.0

      Nguyên Ngọc's Review Sourced from Google

      From my perspective as a former employee: I worked here for almost a year. Colleagues and staffs here are pretty open-minded but employees are highly underpaid. Also in order to get a job here you must have decent technical skills and English language ability. Pros: nice office, friendly staffs that really take care of employees Cons: underpaid salary

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Translating Ideas & Research to Market

    KritiKal Solutions is a technology design house and holds 22+ years of experience in AI, Computer Vision, Software Applications, Cloud and Mobile-based Solutions, Embedded Systems, Generative AI and Large Language Models. We specialize in R&D, product engineering, and innovation services...

    Top Services:

    • AI Development
    • Software Development
    • Mobile App Development
    • IoT
    • IT Services
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    4 Projects Listed

    Kritikal Solution Services

    • AI Development
    • Software Development
    • Mobile App Development
    • IoT
    • IT Services
    • Wearables
    • HR Outsourcing
    • Staff Augmentation
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Vector USA
    • BYJU'S
    • P&G
    • Columbus
    • Continental
    • Honeywell
    • ITC
    • Stryker
    • G&D
    • University of Berkeley
    Data sourced from the agency's DesignRush profile

    Kritikal Solution Reviews & Testimonials

    • Aakriti Bhatnagar
      Aakriti Bhatnagar Review from Google
      5.0

      Aakriti Bhatnagar's Review Sourced from Google

      Great place to work. Very good learning opportunity.Best place for freshers to learn and gain knowledge. Supportive and understanding colleagues.

    • Jobin John
      Jobin John Review from Google
      5.0

      Jobin John's Review Sourced from Google

      One of the best aspects of working at KritiKal Solutions is the opportunity to collaborate with talented professionals across multiple domains. The company promotes a culture of innovation, knowledge sharing, and continuous improvement.

    • twinkle kumari
      twinkle kumari Review from Google
      5.0

      twinkle kumari's Review Sourced from Google

      A great workplace that encourages continuous learning, teamwork, and professional growth. The management maintains an open-door policy, making it easy to share ideas and collaborate across all levels of the organization.

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

The Benefits Of Top Outsourcing Companies In California

Receive Free Proposals

For your project

1

Specify your budget, timeline and project requirements

2

Our experts curate a list of up to 5 most qualified candidate agencies

3

We connect you with them so you can choose the most suitable partner