Top Software Development Companies in California

Which one is the best for your company?

Takes 3 min. 100% free

Software Development United States California

317 companies

Search location

Ratings

Budget

Top Featured Software Development Companies

TRIARE
4.9
(11 reviews)
TRIARE unlocks IT potential of YOUR business
TRIARE is a WEB and MOBILE software development company based in Europe. We are delighted to offer our services as your long-term partner, taking all technical matters off your shoulders and allowing you to focus on your business development. YOU WILL GET: ✔ In-house team . Work with a dedicated team that is 100% focused on your product and located in the same office. ✔ Efficiency & transparency , as our process is based on Scrum methodology and managed by certified Scrum Masters. ✔ Fast result. Working with us, you will get the first result in 1 week. ✔ High quality, as TRIARE has well-established processes of software development and experienced specialists. ✔ Full cycle development . Our company covers all stages of development, handling everything from Discovery and prototyping to Design, development, and maintenance. ✔ IP rights . From the very beginning, you are the only owner of the intellectual property of your project materials: source code, design, documentation, etc. ✔ Warranty period will be provided for your system for free. ASPECTS OF OUR MINDSET: - Focused on results. We are focused on the result of your business with an understanding of the real goals and KPIs that our team should achieve. - Solution Provider. It means that we always come to you with solutions, not with questions. We take all technical aspects of the project off your shoulders, allowing you to focus on the marketing and business strategies. - We go the extra mile. Being a proactive company, we always think and take a step ahead. TECHNOLOGIES WE USE: - Mobile app development: Kotlin, Java, Swift, Objective-C. - Cross-platform development: Flutter, React Native. - Web frameworks: Node.JS, React.JS, PHP, Ruby on Rails.
8 works in Software Development
Located in Fairfax, United States (+3)
From €10,000 for Software Development
Worked in Hospitals & Healthcare (+20)
Speaks English, Ukrainian
51-200 members
Instinctools
5
(10 reviews)
Your AI-powered Engineering Partner
Top awarded
Meet *instinctools - a global AI-powered software engineering company with over 25 years of experience. We help both SMBs and Enterprises build robust, scalable software solutions that excel in functionality and design. Our core services include: Agentic AI enablement Custom software development enhanced by deep AI expertise Digital product engineering Business process automation Legacy system modernization Advanced data analytics and visualization Cloud infrastructure and DevSecOps Headquartered in the USA (Maryland) and Europe (Germany), *instinctools offers convenient locations for meeting and collaborating directly with our clients. We have development centers in Poland, LATAM, India, and Kazakhstan that combine global expertise with a strong price-quality balance to ensure exceptional results across time zones. Our work is backed by ISO-certified quality standards, strategic partnerships with leading tech platform, and a long-standing commitment to engineering excellence. Instinctools holds a broad portfolio of regional and industry-specific certifications, including CIR, HIPAA, and other compliance frameworks required for regulated markets. The 2025 Annual Customer Satisfaction Index is 9.1 out of 10.
4 works in Software Development
Located in Potomac, United States (+4)
From €10,000 for Software Development
Worked in Construction (+10)
Speaks English, German(+1)
201-500 members
Plavno
5
(16 reviews)
AI-First Software Company: Secure Agents, Voice Assistants, and Scalable Cloud.
Top awarded
Plavno is a premier software development house with over 20 years of experience and a highly qualified team of experts in your industry. Fully-fledged teams of specialists cover each stage of product creation , from product management and analysis to design, development, testing, and ongoing support. We have a unique advantage , our pre-formed full teams work exclusively on products in their specific domains, such as Healthcare, E-Learning, FinTech, Travel & Hospitality, Fleet management and more. We can help you with: ✔ Web Development ✔ Mobile App Development ✔ CRM/CMS/SaaS Development ✔ Chat and Chatbot Development ✔ Web3 / DeFi / DAO / Smart contract ✔ WebRTC Stop struggling with bloated budgets and slow time-to-market. At Plavno, our fully-fledged team provides cost-effective and streamlined solutions that minimize technical debt and maximize your product's potential. With end-to-end support and a proven track record in the SAFe Scaled Agile Framework, we're the partner you need to succeed. LET’S CONNECT Let us help you choose the best path forward to deliver the perfect solution: sales@plavno.io
7 works in Software Development
Located in Alexandria, United States (+2)
From €20,000 for Software Development
Worked in Banking & Financials (+19)
Speaks English, French(+2)
51-200 members
U1CORE
4.9
(18 reviews)
PARTNER IN CRIME FOR STRONG BUSINESSES. Websites · Branding · Software
Highly recommended
Top awarded
Websites · Branding · Software Website: https://www.u1core.com/ Book a call: https://calendly.com/hello-u1core/30min Most companies outgrow their digital before they notice. The business is strong, the team is good, the product works. But the website is still the first version, operations still live in spreadsheets, and the brand says nothing a competitor couldn't say. That's where we come in. WHAT WE DO · Websites — marketing sites, landing pages and platforms that sell before your team has to · Branding — identity and design systems that position you at the level you actually operate at · Software — web and mobile products, internal tools and operational systems that replace manual work WHY ONE TEAM Brand agencies do brand. Product studios do product. Outsourcing firms write code. The real problems sit between those disciplines — which is why we do all of it, under one contract, with one person accountable for the result. WHO WE WORK WITH Companies with real revenue and a team in place: founders and owners scaling past their first system, operators rebuilding for growth, and businesses entering a new market. WHERE WE'VE PROVEN IT $720M+ processed through a platform we built. Classified marketplaces with millions of listings. Trading exchanges and auction systems running in production. SaaS, fintech and marketplace products across 40+ projects. HOW WE START With a diagnostic, not a proposal. We look at your website, brand and operations, show where you lose trust, traffic and time — and what to fix first. LET'S TALK IF your business is strong but your website, brand or operations don't play at the same level yet.
34 works in Software Development
Located in London, United Kingdom
From €5,000 for Software Development
Worked in Software & Computer Services (+17)
Speaks English
11-50 members
BluePixel
5
(38 reviews)
Building digital platforms that fuel business impact
Top awarded
BluePixel is a technology, UX/UI, and artificial intelligence company specializing in designing, developing, and evolving digital platforms that generate real business impact. We help corporate companies, scaleups, and organizations with complex digital challenges to transform their products, websites, applications, and internal platforms into more efficient, scalable, and profitable experiences. Our approach combines product strategy, user research, UX/UI design, software development, technological architecture, analytics, and artificial intelligence in a single multidisciplinary team. Unlike a traditional agency, at BluePixel we don't just design interfaces or build software: we create digital systems prepared to grow, measure their performance, and continuously evolve based on real data. With over 10 years of experience and 200 projects developed. BluePixel has supported leading companies in creating high-impact digital solutions. Our promise is simple: develop people-centric platforms focused on return on investment and powered by artificial intelligence.
1 work in Software Development
Located in Miguel Hidalgo, Mexico
From €25,000 for Software Development
Worked in Hospitals & Healthcare (+31)
Speaks Spanish, English
51-200 members
KeyToTech
(0 review)
We help startups and companies develop and launch agile software products
Top awarded
KeyToTech is a software development agency. We deliver AI, mobile, web, and backend services to companies worldwide.
19 works in Software Development
Located in London, United Kingdom (+1)
From €5,000 for Software Development
Worked in Education (+12)
Speaks English, German(+2)
11-50 members

All Software Development Services in California

2 34

Struggling to choose? Let us help.

Post a project for free and quickly meet qualified providers. Use our data and on-demand experts to pick the right one for free. Hire them and take your business to the next level.