Top Custom Software Development Companies in San Mateo, California

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 partner for AI development and staffing

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.

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.

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.

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.

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.