Our expert analysts have ranked the best eCommerce development companies in California that build intuitive online stores to help you turn visitors into paying customers. Filter them by portfolios, budget, client reviews, industry reputation and more to find the right fit for your brand.
Best California eCommerce Development Agency Rankings
2 Companies-Rankings updated: September 04, 2026
DesignRush vets all agencies based on professional qualifications and verified customer feedback to help you choose confidently. Some featured agencies maintain paid sponsorships.
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Your trusted AI software development partner
Diffco builds Magento and Shopify web stores for retail and eCommerce clients, including grocery delivery platform Food Rocket, from its Silicon Valley base. The 2008-founded eCommerce company also specializes in AI and custom software development, having delivered 1,150+ projects overall...
Top Services:
AI Development
Software Development
Staff Augmentation
Mobile App Development
Web Development
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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
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
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
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
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Pace Digital is a cutting-edge digital marketing agency offering innovative solutions for businesses. With expertise in SEO, social media marketing, web design, and more, we help clients optimize their online presence and drive targeted traffic. Our team of experts utilizers data-driven strategies to deliver...
Top Services:
Web Development
Mobile App Development
Web Design
eCommerce Development
Branding
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Location
Oakland, California
Number of Employees
1000 & Up
Average Hourly Rate
$70/hr
Minimal Budget
$25,000 - $50,000
Pace Digitals Services
Web Development
Mobile App Development
Web Design
eCommerce Development
Branding
Digital Marketing
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Fantasy of Flight
Jet Edge
Bill Hansen Catering
Data sourced from the agency's DesignRush profile
Pace Digitals Reviews & Testimonials
Nancy
Undisclosed at Undisclosed
5.0★
Video Production Review from Nancy
I've had the pleasure of witnessing Pace Digitals exceptional creativity and expertise in bringing ideas to life through animation. Their ability to convey complex concepts with visual storytelling is nothing short of impressive. Pace Digitals’ video animation consistently delivers engaging and visually stunning animations that captivate audiences and effectively communicate messages.
Christopher
Undisclosed at Undisclosed
5.0★
SEO Review from Christopher
The impact of Pace Digital's SEO service was not only noticeable but also transformative. The surge in international website traffic, improved search engine rankings, and enhanced global customer engagement reinforced the efficacy of their approach. Beyond the numbers, their service has played an instrumental role in positioning my brand as an authority on a global scale.
Nathaiel Lai
Undisclosed at Undisclosed
5.0★
Logo Design Review from Nathaiel Lai
Pace Digitals truly exceeded my expectations with their logo design services. Their creative team demonstrated a deep understanding of our brand vision and translated it into a captivating and unique logo. Communication was seamless throughout the process, and they delivered the final design promptly.
Reviews verified by DesignRush and sourced from the agency's profile
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