YourNavi: guided AI carrier switching assistant(opens the agency's site)
Built a stateful assistant on Wippy that walks users through switching mobile carrier and shows where they drop off.
SSpiral ScoutCustom API Development Agencies in California, United States
10 Custom API Development agencies in California, United States are listed in the directory. Many also offer AI Development, Web Development and Mobile Development. Industries they list most often: Financial Services, Healthcare and Entertainment.
Custom API Development case studies from California
All case studiesPIB Sales: agentic supplier import system for NetSuite(opens the agency's site)
Replaced manual spreadsheet conversion with reusable supplier mappings and automated NetSuite import files.
SSpiral ScoutProxa: grounded AI reporting for an executive data hub(opens the agency's site)
Swapped a failing agent framework for a Claude-based retrieval loop with cited reports and a chat interface on Azure.
SSpiral ScoutKabata: smart dumbbell apps with AI coaching analytics(opens the agency's site)
Designed the app and device screens and built native apps that use AI analytics to give home users tailored strength coaching.
GGoji LabsTGS: energy data dashboards web app(opens the agency's site)
Turned siloed energy datasets into interactive dashboards for experts and executives, with a modular design system.
GGoji Labsk-ID: child safety verification platform(opens the agency's site)
Researched users and built a web app with simple onboarding, encryption and role-based access for handling children's data.
GGoji LabsCustom API Development agencies in other places
Other services in California
Not sure which agency to pick?
Send a short brief and we match you with agencies in California, United States that fit. It is free for buyers.
Frequently asked questions
How many Custom API Development agencies are there in California?
The directory lists 10 Custom API Development agencies in California, United States. None of them has claimed its profile yet.
What else do Custom API Development agencies in California offer?
The most common services are AI Development (8), Web Development (8), Mobile Development (6), Product Design (5) and Cloud Consulting (4).
Which industries do they work with?
The industries listed most often are Financial Services (5), Healthcare (5), Entertainment (3), Information Technology (3) and Logistics (3).
How big are these agencies?
By team size: 1 with 1-5 people, 3 with 6-20 people, 2 with 21-50 people and 4 with 51-200 people.
How do I choose the right agency?
Start with agencies that list the service you need and have worked in your industry. Read their case studies and client reviews, and look for the Reviewed badge. Ask how they handle your data, who maintains the work after launch, and what a first project costs. Sponsored places are always labelled, and our ranking page explains how the order is set.
Can you match me with an agency?
Yes. Describe your project in a short brief and we send it to up to 3 agencies whose skills, industries and location fit. It is free for buyers, and the agencies contact you directly.