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.
Organic rankings are determined by five factors: top services, reviews, portfolio, awards/press, and team expertise. Sponsored listings pay for a placement that appears above organic positions. Sponsorship does not affect star ratings or review content - read more on our methodology page.

Azumo
VerifiedVerified by the DesignRush team for authenticity and credibility.Build Intelligent Apps for Web, Mobile, Data, AI and Cloud
Client partnerships average 3.2+ years. Azumo delivers nearshore and onshore engineering for AI, machine learning, and full-stack development, serving Facebook, Omnicom, United Health, and Discovery Channel with teams specializing in Python, React, Next.js, Node.js, and AWS.Recent reviews highlight...
Top Services:
- AI Development
- Software Development
- Staff Augmentation
- Mobile App Development
- Big Data Analytics
- Show more
- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $55/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 9 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsAzumo Services
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Azumo Reviews & Testimonials

Software Development Review from Michael S.
We selected Azumo to develop our software. We transitioned from another development company, so Azumo was initially responsible for migrating our existing code and environments. We are currently still working with Azumo as our nearshore software development team on adding new items to our software.

UI/UX Design Review from Anonymous
Azumo helped us migrate our existing UIs into a new framework, creating reusable components and the infrastructure needed for future development. The developer they assigned became a seamless part of our team, always punctual, responsive, and a great fit overall.

Software Development Review from Anonymous
Thanks to Azumo’s work, our product is now more scalable, optimized, and ready for a growing user base. Their team has managed the engagement effectively, keeping us updated and addressing any challenges along the way. We’ve appreciated their constant availability and proactive communication.
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsYour Innovation Partner
ITRex delivers end-to-end AI and data solutions from strategic planning to real-world deployment. The companys expertise spans LLM integration, RAG, copilots, SLMs, and autonomous AI agents, all engineered for reliability and scale...
Top Services:
- Software Development
- Mobile App Development
- Software Testing
- AI Development
- IoT
- Show more
- Location
- Aliso Viejo, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 5 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsITRex Group Services
Data sourced from the agency's DesignRush profileDollar Shave Club Jib Jab 21st Century Fox Procter & Gamble Meet Me Dun & Bradstreet
ITRex Group Reviews & Testimonials

IT Services Review from Tammy Walker
Extremely creative and awesome company name. It sounds trustworthy.

Web Development Review from Undisclosed
We are making in minutes things that our teams have been stuck with for days before.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews30 Years of Excellence in Delivering Future-Proof Software Solutions
Delivering world-class products to Fortune 500 companies and cutting-edge startups for over three decades, we have navigated every economic climate, optimizing production costs to provide our clients with exceptional ROI...
Top Services:
- Software Development
- IoT
- AI Development
- Wearables
- Mobile App Development
- Show more
- Location
- Palo Alto, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 4 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsWaverley Services
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Waverley Reviews & Testimonials
Christi Kambs's Review Sourced from Google
Had such great care here, all of the nurses were kind and friendly, I completely felt safe and listened to by the anesthesiologist and Dr Roost was excellent at explaining my procedure and clearly passionate and skilled in her field. Clearly no none wants to have a colonoscopy but their staff made it as easy and smooth as possible!
Shellie Cloud's Review Sourced from Google
The staff exuded warmth and professionalism, making me feel welcomed and at ease. Their accommodating nature helped create a soothing atmosphere. Dr. Lieu was not only highly skilled but also radiated a calming presence, allowing me to feel completely relaxed and confident in my procedure.
Ruby LI's Review Sourced from Google
I was pleased with the services I received in the Waverley surgery center for my much procrastinated colonoscopy. Everyone was friendly, caring and attentive which made me feel comfortable and relaxed. Everything went smoothly, they gave clear instructions for after procedure and called next day to make sureeverything was all right. I highly recommend it.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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