Top Custom Software Development Companies in California

Goji Labs

An award-winning digital product agency that builds it right.

5.0(94)

5.0

94 reviews

For over a decade, we’ve helped leading brands launch 400+ digital products. Our expertise spans product strategy, UI/UX design, and software development. We believe no great venture should be held back by execution. That’s why we lead with strategy, work as true partners, and build products that scale. We help you define the right thing to build then design, develop, and launch it with clarity and purpose. Our partners have raised over $1B in funding—and counting.

eSEOspace

Verified

Website Design, Development, SEO, GEO, AEO

5.0(4)

5.0

4 reviews

A fully-comprehensive marketing firm offering services such as Search Engine Optimization, Search Engine Marketing, Social Media Marketing, Public Relations and more! We are your partner in Marketing.

4Thought Marketing

Verified

Oracle Eloqua and Adobe Marketo consulting for B2B marketing teams, focused on strategy, integration, and privacy compliance.

4Thought Marketing is a specialized, remote-first marketing automation agency providing enterprise-grade automation, operations, and privacy compliance solutions to clients in North America, Latin America, Europe, and Asia. For over 15 years, we’ve helped organizations around the world optimize their marketing technology stack with deep expertise in Eloqua and Marketo platform implementation, migration, and ongoing optimization. Our certified marketing automation experts deliver comprehensive services including advanced campaign management, complex lead scoring and nurturing setups, CRM integrations, and multi-channel automation strategies across both Eloqua and Marketo platforms. We specialize in large-scale enterprise implementations, offering everything from platform migrations and custom dashboard development to ongoing account health audits and performance enhancement. As your dedicated marketing automation consulting partner, we provide tailored integration services, data segmentation, list management, and team training for both Eloqua and Marketo to ensure maximum platform adoption and ROI. Our proven track record includes managing complex enterprise implementations while maintaining the highest standards of regulatory compliance and data-driven customer engagement.

WPRiders

Mission‑Critical Digital Infrastructure for Serious Business

Happy clients/buyers and long‑term investors, spotless reputations, and the room to grow are what we facilitate for clients all over the world.

Vincit

Digital Development and Design Agency with strong AI capabilities

Vincit is a trusted partner for companies like Logitech, Cisco, The New York Times and LTK in developing their digital products and services. With roots in Finland and presence in the US since 2016 we are now over 500 experts ready to serve you. We combine meaningful user experience design to top-tier technical development for mobile, web and cloud. With the use of latest AI tools, we are able to deliver projects more efficiently and help your organization gain AI-Driven-Development capabilities throughout the collaboration. Ask us for free consultation and quote for your project. We are especially interested in challenging projects with established companies.

Eltex Soft

Web Solutions | Mobile Apps | Team Augmentation

At EltexSoft we build custom software solutions, as well as augment existing engineering teams of startups, Fortune 500 and INC 5000 companies. Following business domains are the area of our highest expertise: • Sports, Health & Wellness, Longevity (web+mobile platforms) • Food Delivery (logistics, eCommerce) • Education (matching, CRMs, data management, online learning, LMS) • Medical Technology (HIPAA compliant web and mobile apps) • E-commerce, B2B and B2C marketplaces, payment solutions • HR & Recruiting (matching, CRMs) • Generative AI (storyboards, movie and animation making tools) Why EltexSoft? With decades of individual and team experience, we use best practices and process to make software happen and drive your ROI: • Focus on user experience, delivery and quality • A-players and 10x engineers building best in class apps • Business and values over process and technology • Test coverage, cross code reviews, perfect Ops and CI/CD • Excellence in communications and teamwork

Spiral Scout helps companies turn messy, high-stakes workflows into durable, agent-driven production systems. We step in where internal teams or generic agencies stall — typically at the intersection of automation, data, and AI that must operate inside real business constraints. We don’t sell headcount or ticket delivery. We design and ship working systems that run reliably, scale over time, and stand up to audits. From AI agents and long-running workflow orchestration to CPQ and complex SaaS platforms, we take responsibility from architecture through production readiness — and leave clients with systems they can own and operate independently.

Diffco

Your trusted software development partner

5.0(10)

5.0

10 reviews

Diffco is a San Jose-based company specializing in AI, custom software development, and staffing services. With more than 17 years of expertise in creating dependable solutions for mobile, web, and AI applications, it is committed to driving and supporting the growth of your business. Products we developed are used by renowned companies such as American Express, Starbucks, Whole Foods, Mars, and many successful startups like Maze, Happier, and Legion Farm, among many others. Why Diffco? For your project development: -Client-driven approach and clear communication -Transparent processes and billing -Detailed reporting and deliverables -Dedicated project team with no cross-project sharing For your team augmentation: -Transparent pricing with no hidden fees -Vetting and verification of team member expertise -Fast and straightforward hiring for both long and short-term projects -A dedicated account manager to facilitate interactions with both candidates and hired personnel

Waverly Software

Waverley is a software engineering company with over 400 technical specialists building distributed development teams in Bolivia, Mexico, Romania, Vietnam, and Ukraine to augment your internal team’s capabilities.

Genesys

Every year, Genesys® orchestrates more than 70 billion remarkable customer experiences for organizations in more than 100 countries. Through the power of our cloud, digital and AI technologies.

Niantic

Niantic inspires people to explore the world, together. Our mission is to use emerging augmented reality (AR) technology to enrich our experiences as human beings in the physical world. Originally formed at Google in 2011, we are now an independent company with a strong group of investors including Nintendo, The Pokémon Company, and Alsop Louie Partners.

WLCM App Studio

Verified

WLCM is a custom software design and development studio. A tight-knit and long-standing veteran team, we've built our reputation winning "best in class" recognition by Apple, “Best of Experience Design” by FastCo, and "Best in Business" by Inc.

TouchZen Media

Verified

A boutique mobile app agency based in Orange County, CA, helping startups and growing companies design, build, and scale iOS, Android, and web apps.

5.0(42)

5.0

42 reviews

We’re more than a digital agency — we work as an extension of your team. From concept to launch, we design and build products that are functional, intuitive, and aligned with your goals. Since 2014, our focus has been on crafting experiences that feel effortless and meaningful for the people who use them — delivering results that stand out for their clarity and impact.

Altoros

Altoros is a leading technology consulting firm that specializes in custom software development, cloud automation, and artificial intelligence solutions. With a focus on innovation and quality, Altoros helps businesses accelerate digital transformation and optimize operations through tailored digital strategies. Leveraging expertise in various industries, the company delivers scalable solutions that drive efficiency and growth.

G360 Technologies

Verified

G360 Technologies helps companies develop custom software solutions while maximizing the opportunities created by the use of Cloud & AI. We take the time to understand our customers unique business challenges and are 100%-focused on business outcomes.

CitrusBits

AI, XR, and healthcare software experts building secure, scalable digital products and Software as a Medical Device (SaMD) solutions.

CitrusBits is a digital innovation company specializing in custom software development, AI solutions, immersive XR technologies, and Software as a Medical Device (SaMD) platforms. With over 15 years of experience, we help startups, healthcare organizations, and enterprises transform complex ideas into scalable, secure, and high-impact digital products. Our multidisciplinary team designs and develops mobile apps, SaaS platforms, AI-driven systems, and immersive training solutions that improve real-world outcomes. From product strategy and UX design to engineering and deployment, we partner closely with clients to deliver reliable, future-ready technology. At CitrusBits, our focus is on innovation, quality, and building meaningful digital solutions that solve real problems across healthcare, enterprise, and emerging technology industries.

IntuitionLabs

Veeva, AI, and data solutions for life sciences.

IntuitionLabs is a premier technology firm based in San Jose, California. We specialize in building custom artificial intelligence (AI) software and enterprise solutions for the pharmaceutical and life sciences industries. Founded by 25 year software engineering veteran Adrien Laurent, our company helps biotech teams use advanced technology while staying compliant with strict global health rules. We ensure every project meets critical standards like FDA 21 CFR Part 11, EMA Annex 11, GxP, and HIPAA. Our Specialized Services We operate where advanced data engineering meets the Veeva Systems ecosystem. Our San Jose based team helps mid to large cap pharmaceutical companies manage their digital growth with precision. Official Veeva Vault CRM X Pages Partner As a certified partner, we provide expert level implementation and customization for the Veeva software stack. We specialize in the Development Cloud for Clinical, Regulatory, Quality, and Safety suites. We also use Veeva Nitro to unify fragmented data into a single source of truth. Pharmaceutical AI and Analytics We design high performance AI tools that work within strict clinical guardrails. This includes Medical Info Chatbots for healthcare professionals and Sales Operations Assistants for territory management. Our tools are built to ensure data integrity and eliminate errors. Data Engineering and Warehousing We build the robust technical plumbing required for enterprise scale AI. Our team optimizes cloud platforms like Snowflake, Redshift, and BigQuery to help you make better, data driven decisions. Quality and Computer System Validation We provide documented evidence of system performance through specialized CSV services. We also offer process automation (RPA) for regulatory submissions and pharmacovigilance to keep your business audit ready. The IntuitionLabs Method What sets us apart is our structured four step framework: - Assess: We evaluate your AI maturity and data readiness. - Train: we host workshops where your team learns to build real projects. - Support: We provide constant technical help and office hours. - Measure: We track time saved and ROI with regular reviews. Why Choose IntuitionLabs? IntuitionLabs delivers real world results for industry leaders like Scilex Holding Company. We remove the extra complexity from your systems so you can focus on the future of medicine. By combining deep technical skill with pharmaceutical industry knowledge, we help our clients move faster and with more confidence. If you are looking for a professional partner in San Jose for Veeva services or custom pharma AI solutions, IntuitionLabs offers the expert support you need.

Smartexe

Remote organic team ready to start development from day one

Smartexe is a software development company specializing in building scalable, production-ready digital solutions for startups and enterprises. We focus on organic remote teams — dedicated engineering teams that integrate seamlessly with a client’s in-house operations. Instead of acting as an external vendor, we work as a true extension of the client’s team, ensuring better alignment, faster delivery, and long-term stability. The company provides a full cycle of services, including custom software development, mobile and web applications, AI-driven solutions, and IT staff augmentation. Smartexe is known for combining speed with strong engineering practices, helping clients move from idea to production efficiently without compromising quality.