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.
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
Our mission at Closeloop Technologies is to empower enterprises with transformative Software Development, from advanced conversational AI and custom CRM/ERP to robust mobile apps and e-commerce platforms. With our extensive industry knowledge, achieving success in digital innovation is second nature...
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
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
- IoT
- Mobile App Development
- Software Development
- Wearables
- 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
Simform is a premier AI-native digital engineering company specializing in Product Engineering, Agentic AI, Data, Cloud and Enterprise Transformation. We help enterprises and high-growth ISVs build sophisticated AI-integrated digital solutions and scalable platforms...
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
For offshore and onshore software builds, A3Logics delivers custom development, mobile applications, and cloud modernization across enterprise and startup clients. The Carlsbad-based team maintains development centers in India and Singapore, supporting Fortune 500 companies and ISVs with agile engineering...
Top Services:
- Mobile App Development
- Software Development
- Big Data Analytics
- Blockchain
- AI Development
- Show more
- Location
- Carlsbad, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $35/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 13 Projects Listed
TekRevol is a globally recognized digital innovation company with 10 years of experience delivering high-impact mobile applications, AI-powered software, and scalable digital products. Every engagement begins with a clear roadmap, defined KPIs, and a commitment to measurable business outcomes...
Top Services:
- Mobile App Development
- Web Development
- AI Development
- Staff Augmentation
- Digital Marketing
- Show more
- Location
- San Francisco, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $35/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 46 Projects Listed
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
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

Empat
VerifiedVerified by the DesignRush team for authenticity and credibility.Since 2013, we've delivered 300+ digital products across 17 countries, empowering brands like Porsche, Panasonic, Transparency International, Heinemann, CBRE, and dozens of ambitious startups and scaleups...
Top Services:
- Mobile App Development
- Software Development
- Staff Augmentation
- AI Development
- Web Development
- Show more
- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $45/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 24 Projects Listed
Softermii (https://www.softermii.com/) is an outsourcing/outstaffing company with more than 8 years of experience in web and mobile application development with a team of more than 120 specialists from 6 countries...
Top Services:
- Mobile App Development
- Web Development
- Software Development
- UI/UX Design
- Blockchain
- Show more
- Location
- Los Angeles, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $45/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 22 Projects Listed

Solveit
Award WinnerRecipient of a Best Design Award for outstanding work.We design and develop top-rated mobile and web apps for startups and SMEs. E-commerce, Healthcare, Marketplaces, and more. Our clients rate us for 5 out 5 - check out why!...
Top Services:
- Mobile App Development
- Software Development
- Web Design
- Design Services
- AI Development
- Show more
- Location
- San Francisco, California
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $45/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 32 Projects Listed
We were established in 2003 as a software development (web/mobile) and staffing company, and have extensive experience in all phases of the development lifecycle, from design to development, software QA, and UI/UX...
Top Services:
- Software Development
- UI/UX Design
- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $49/hr
- Minimal Budget
- $25,000 - $50,000
Here at Lanex Corporation, we are a full-cycle software development service provider specializing in bespoke digital solutions for startups and companies globally. We build scalable and secure products designed to impact your brand and provide the best digital experience for your users...
Top Services:
- Mobile App Development
- Software Development
- IT Services
- Web Development
- Staff Augmentation
- Show more
- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $49/hr
- Minimal Budget
- $25,000 - $50,000
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
Vention builds custom software across fintech, healthtech, and eCommerce, for clients like ClassPass, Mount Sinai, and Slice. Its ISO 27001-certified team serves 30+ industries and over 500 clients. With 20+ years of experience, the software development firm is best for businesses needing scalable...
Top Services:
- Software Development
- Staff Augmentation
- Mobile App Development
- Software Testing
- Web Development
- Show more
- Location
- San Francisco, California
- Number of Employees
- 1000 & Up
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 15 Projects Listed
Altoros is a 350+ person strong IT consulting and development group. For over 20 years, we've been assisting Global 2000 organizations in getting software products to market faster and reducing the cost of R&D experiments to enable stable business growth...
Top Services:
- Software Development
- Mobile App Development
- Web Design
- Web Development
- Staff Augmentation
- Show more
- Location
- Pleasanton, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 12 Projects Listed

Yalantis
VerifiedVerified by the DesignRush team for authenticity and credibility.Full-cycle tech partner with deep expertise in IoT
We deliver cutting-edge, scalable, and fully functional IoT hardware and software products and ecosystems that help clients achieve their specific objectives...
Top Services:
- IoT
- Software Development
- Mobile App Development
- AI Development
- Big Data Analytics
- Show more
- Location
- California City, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 24 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsYalantis Services
Data sourced from the agency's DesignRush profileRAKwireless Toyota Tsusho KPMG Healthfully Orbis Systems Lifeworks Scholz Databank 123 Sourcing Truhoo
Yalantis Reviews & Testimonials

Fintech Review from Sergei Lishchenko
The exception team the client collaborated with brought in fresh ideas and innovative technologies previously unfamiliar to the client. For example, with Yalantis' guidance, the client's developers explore the Go language. The primary reason the client chose Yalantis is its strong organizational and project management skills. It's not just about the developers; Yalantis provides a comprehensive support framework, ensuring that a project manager is consistently present. (Verified via email)
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Software Development Review from Jason Jung
Yalantis functions as an integral scrum team, supporting the development teams of a real estate firm. It created renovation project management tools that encompass a web app, a mobile app, and a backend system. Thanks to Yalantis, the client expanded development capabilities and achieved key short-term goals. Its quick integration was pivotal in launching various projects. Beyond delivering top-notch work, Yalantis emphasizes a culture that prioritizes the customer's needs. (Verified via email)
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Outsourcing Review from Roy D
An IoT manufacturer teamed up with Yalantis to craft an application, enabling users to manage their devices more efficiently. Utilizing Node.js and basing the architecture on Circulus, Yalantis delivered commendable outcomes. It is responsive to any development challenges, offering swift resolutions. The client appreciates Yalantis' proactive stance, impressive technical expertise, and practical solution suggestions. (Verified via email)
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsSpace-O Technologies is a software development company having 13+ years of experience in delivering custom software solutions for startups, enterprises, and Fortune 500 companies...
Top Services:
- Mobile App Development
- AI Development
- Software Development
- Web Development
- Web Design
- Show more
- Location
- Ontario, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 4 Projects Listed
Wve Labs is a digital product company bringing strategy, design, and engineering together to create mobile apps, web platforms, and custom software. Since 2015, we have partnered with startups, growth companies, and global organizations to design, build, and scale digital products...
Top Services:
- Mobile App Development
- Software Development
- UI/UX Design
- Product Design
- Web Development
- Show more
- Location
- Costa Mesa, California
- Number of Employees
- Under 49
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 5 Projects Listed
VentureDive is an award-winning custom software development company dedicated to spearheading digital transformations for Fortune 500 companies across BFSI, CPG/retail, healthcare, transportation, logistics, and QSR industries through its expertise in the realms of Fintech, Data & AI, HealthTech, PropTech...
Top Services:
- AI Development
- Software Testing
- Software Development
- Mobile App Development
- Big Data Analytics
- Show more
- Location
- Mountain View, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
GenXAI is a publicly listed technology company building enterprise planning and data systems. Our team of 450+ consultants delivers Anaplan and SAP led implementations, ERP transformation, data analytics and engineering, and application development for clients across India, the United States, Malaysia, and...
Top Services:
- ERP Consulting
- CRM Consulting
- Big Data Analytics
- IT Services
- Business Consulting
- Show more
- Location
- Pleasanton, California
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
Tateeda is a company specializing in custom software development and staff augmentation services, with a skilled workforce of 100+ seasoned engineers...
Top Services:
- Software Development
- IT Services
- Mobile App Development
- IoT
- AI Development
- Show more
- Location
- San Diego, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $65/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 1 Project Listed
Clear your backlog and ship products you're proud of faster with our nearshore software development resources. We provides highly skilled, team-based resources to companies that need tech talent fast...
Top Services:
- Mobile App Development
- Software Development
- Staff Augmentation
- Web Development
- eCommerce Development
- Show more
- Location
- San Francisco, California
- Number of Employees
- Under 49
- Average Hourly Rate
- $70/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 8 Projects Listed
Anmel is proven to boost productivity by up to 60% and efficiency by 45% for startups and enterprises alike. Trusted by businesses globally, Anmel delivers tangible results, driving success and growth in today's competitive market landscape...
Top Services:
- AI Development
- Software Development
- IT Services
- Mobile App Development
- Wearables
- Show more
- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $70/hr
- Minimal Budget
- $25,000 - $50,000
EltexSoft is a boutique engineering studio of 35 to 50 senior developers, building web, mobile, and AI products for startups and established companies since 2015. We embed as a long-term extension of your team, the engineers who scope the work are the ones who ship it...
Top Services:
- eCommerce Development
- AI Development
- Web Development
- Software Development
- Mobile App Development
- Show more
- Location
- Los Angeles, California
- Number of Employees
- Under 49
- Average Hourly Rate
- $80/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 3 Projects Listed
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
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
Idea Maker is a U.S.-based software development agency helping businesses transform ideas into scalable digital products. Our expert team specializes equally in mobile apps, custom software, AI-powered solutions, and modern web platforms...
Top Services:
- Mobile App Development
- Software Development
- Web Development
- AI Development
- Web Design
- Show more
- Location
- Irvine, California
- Number of Employees
- Under 49
- Average Hourly Rate
- $125/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 10 Projects Listed
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