All Cross Platform Development Agencies in California
SaM Solutions
5(3 reviews)SaM Solutions is an international provider of IT services and software solutions with over 30 years
RecommendedTop awardedWe focus on IT consulting and custom software engineering, catering to both the European and US markets by leveraging our global resources. Serving a wide range of clients, from startups and SMBs to global enterprises and government agencies, we deliver technological excellence, accelerate time to market, and ensure uncompromised software quality and security. SaM Solutions employs some of the most talented IT professionals in the industry. We continually invest in skills development and knowledge enhancement to ensure our clients receive world-class software solutions and services most cost-effectively. In every client engagement, we are committed to guaranteeing the success of IT processes and software systems.1 work in Cross Platform DevelopmentLocated in Norwood, United States (+5)From €1,000 for Cross Platform DevelopmentWorked in Automotive (+23)Speaks English, German(+2)501-1000 membersTouchZen Media
5(4 reviews)Top awarded75+ Mobile Apps Shipped. 12+ Apps Featured by Apple & Google. 20M+ Downloads. TouchZen has shipped 75+ mobile apps since 2014 with 20M+ collective downloads and 12+ apps featured by Apple and Google, including SHRED (Apple's App of the Day) and FullyRaw (#1 paid app in Food & Drink within one week of launch). We're not a dev shop that takes your wireframes and starts coding. Every project starts with competitive analysis and market research, so we understand your users, your competitors, and where your app fits before a single screen is designed. From there, we build full interactive prototypes in Figma, so you can see and test the complete experience before development begins and before the big spend starts. Our team specializes in iOS, Android, Flutter, and React Native, with senior engineers who stay on your project from kickoff to launch and beyond. We work with early-stage startups building their first MVP and growth-stage companies scaling to millions of users, including Beachbody, Shred, JetBay, Amalfi Jets, and GetCover How we keep budgets sane without cutting corners: Our strategy, design, and project leadership are based in California. Your point of contact is always senior and always stateside. Part of the development is handled by a vetted global engineering team we've worked with for years, not random freelancers spun up for your project. This hybrid model means you get the communication, accountability, and quality of a US agency without the $300K price tag that usually comes with it. It's also why we can honestly tell you what not to build, because we're not padding scope to justify overhead. A lot of our clients come to us after a bad experience with another agency, with missed deadlines, junior developers swapped in mid-project, or code that couldn't scale past 10K users. We built TouchZen to be the opposite of that: a senior team, a research-first process, and a founder who personally oversees every engagement.Looking for work in Cross Platform DevelopmentLocated in Irvine, United StatesFrom €10,000 for Cross Platform DevelopmentWorked in Travel & Leisure (+5)Speaks English11-50 membersIdea Usher
4.2(7 reviews)Ushering in Innovation
Highly recommendedIdea Usher is a premier tech solution provider, offering a full spectrum of next-generation digital solutions to startups, Fortune 500 companies, and enterprises worldwide. With offices across the USA, UK, Canada, and India, we are dedicated to transforming client visions into impactful digital realities. Our mission is clear: to harness the power of cutting-edge technology in AI, Blockchain, Web3, and Tokenization, driving growth and creating solutions that matter. With over 11 years of experience, we have successfully delivered more than 1000 projects across 50+ countries, empowering 500+ clients to thrive in today’s digital landscape. Our expertise spans custom app development, legacy system modernization, and innovative tech deployments tailored to each client's needs. Our team of 250+ seasoned professionals—including developers, engineers, designers, and digital strategists—is proficient in 35+ tools and languages, ensuring each project is built on a foundation of innovation, quality, and functionality. By integrating sleek design with advanced technology, we craft human-centered UI/UX experiences that stand out in the market. Customer satisfaction is at the heart of what we do, and we are dedicated to delivering excellence in every project. We’ve partnered with leading brands like BuzzTime, Gold’s Gym, Share My Ride, Payhoo, huBear, and Mediport, building a track record of trust and reliability.Looking for work in Cross Platform DevelopmentLocated in Mountain View, United States (+1)From €1,000 for Cross Platform DevelopmentWorked in Sports (+1)Speaks English, Hindi201-500 membersAppsters
5(10 reviews)Tech Company That Provides App Solutions - Appsters
Highly recommendedAt Appsters, we specialize in crafting cutting-edge mobile applications that help businesses grow, innovate, and connect with their audiences. With a proven track record in delivering high-performing apps, our team of expert developers and strategists covers the full spectrum of mobile solutions — from native Android and iOS apps to cross-platform, hybrid, and Flutter/React Native development. Founded in 2010, we proudly partner with businesses across diverse industries, including healthcare, education, automotive, fitness, fintech, logistics, and travel. By combining technical expertise with industry insights, we deliver tailored applications that solve real-world challenges and drive measurable results. Our approach goes beyond coding — we work closely with clients from strategy and design to deployment and support, ensuring every app is intuitive, scalable, and future-ready. Whether you’re a startup bringing a fresh idea to life or an enterprise streamlining complex processes, Appsters delivers digital solutions that make an impact. At Appsters, innovation and reliability are at the core of everything we do. We don’t just build apps; we build digital experiences that empower brands to thrive in today’s competitive market.Looking for work in Cross Platform DevelopmentLocated in San Jose, United StatesFrom €499 for Cross Platform DevelopmentWorked in Banking & FinancialsSpeaks English201-500 membersRHILLANE Marketing Digital
4.9(124 reviews)Grow Big, Grow Right.
Highly recommendedTop awardedAt RHILLANE Digital Marketing, we don't just promote your brand: we reveal its full potential. As a 360° digital marketing agency, we have supported over 615 clients worldwide, generated over $240 million in revenue for more than 1200 clients, on 1600+ projects, and managed over $50 million in advertising budgets. With offices in Dubai, Morocco, and California, USA, we are proud to serve an international clientele by providing customized and high-performing solutions. Results that speak for themselves. With 280 Meta Ads clients, over 80% of our campaigns showing a ROAS greater than 7, and a satisfaction rate of 96%, we turn our clients' ambitions into measurable successes. Our services range from creating elegant and intuitive websites, to SEO that boosts your rankings, through highly targeted Meta, Google, and TikTok advertising campaigns. Each strategy is designed to capture attention, generate conversions, and build customer loyalty. RHILLANE Digital Marketing is more than a digital agency: we are your growth partner. Thanks to our cutting-edge tools, our bold creativity, and data-driven expertise, we help our clients overcome their competitors and reach new heights. Join the companies that have already transformed their online presence with us. Your success starts here. We are also certified Google Premier Partner, Shopify Partner, Semrush Partner, and official Meta Partner.Looking for work in Cross Platform DevelopmentLocated in Torrance, United States (+2)From €1,000 for Cross Platform DevelopmentWorked in Travel & Leisure (+18)Speaks English, Arabic(+1)51-200 membersApptech Systems
5(6 reviews)Your Enterprise’s Next Chapter Starts Here!
Top awardedFounded in 2017, Apptech has emerged as a reliable ally for organizations on their journey towards digital transformation. We specialize in crafting a suite of digital solutions that strategically leverage the transformative power of technology. Our core expertise encompasses bespoke software, innovative web and mobile applications, and robust enterprise solutions that guide our clients toward a prosperous digital future. We are proud partners with industry giants Microsoft and Amazon, utilizing their cutting-edge technologies to deliver exceptional results. Moreover, our operations extend from our headquarters in Türkiye to the United States and Saudi Arabia. Each office is equipped to serve regional clients with tailored expertise, making us a global player in the digital solutions arena. End-to-End Software Development Web & Mobile App Development AI & Machine Learning SaaS Development PoC/MVP Development App Modernization IT Consulting Quality Assurance Services Our mission is to help enterprises accelerate the adoption of new technologies, untangle complex issues that always emerge during digital evolution, and orchestrate ongoing innovation. Whether it is a consumer-oriented app or a transformative enterprise-class solution, the company leads the process from ideation and concept to delivery and provides ongoing support through its quality framework.Looking for work in Cross Platform DevelopmentLocated in Lodi, United States (+3)From €5,000 for Cross Platform DevelopmentWorked in Household Products (+12)Speaks English, Arabic11-50 membersBluelight
(0 review)👨💻 Bluelight is a leading custom software development company with a team of top-quality software developers from 6 different countries spanning the US, Canada, and LATAM, enabling companies to achieve their roadmaps with speed and precision. 🛠️ We offer a wide range of services, including Software Development Services, Staff Augmentation, Development Teams, SOC 2 Compliance, DevOps and Cloud Services, Custom AI Solutions, and much more. 🤖 We have expertise in various technologies such as React, Node.js, Python, .NET, Java, Ruby, PHP, Golang, and Angular. 📲 Bluelight also provides solutions in QA Testing & Automation, Business Intelligence, Data Science, iOS and Android App Development, and UX/UI Design. 🚀 Our mission is to be a reliable partner empowering businesses with cutting-edge software, technology, and infrastructure solutions that deliver value and drive societal transformation.Looking for work in Cross Platform DevelopmentLocated in Sacramento, United StatesFrom €10,000 for Cross Platform DevelopmentWorked in Logistics & Supply ChainSpeaks English201-500 membersAkveo
5(1 review)Here to Build
Akveo is an international software development firm that creates innovative digital solutions to help businesses grow. Specializing in custom software, low-code/no-code platforms, and UI/UX design, we empower companies of all sizes to turn their concepts into scalable, high-performing applications. As a certified Retool development partner and React Native expert (https://www.akveo.com/services/mobile-application-development/react-native), Akveo has successfully completed 500+ projects across sectors like finance, healthcare, eCommerce, and EdTech. Our team of experienced software engineers, designers, and business analysts works collaboratively to deliver top-quality solutions. From cross-platform mobile development to MVP creation and AI-driven automation, we are dedicated to providing exceptional results that surpass client expectations.5 works in Cross Platform DevelopmentLocated in Warsaw, PolandFrom €3,000 for Cross Platform DevelopmentWorked in Insurance (+6)Speaks English, German(+2)51-200 membersTepia
(0 review)Build more than an app. Build loyalty.
Tepia is a mobile development agency that is dedicated to building customer-focused experiences that prioritize the needs and preferences of each customer. We believe that the key to success in growing businesses is understanding and empathizing with customers, and that is why we base our work on not only the latest trends and best practices, but also on the latest developments in human psychology and behavioral research.Looking for work in Cross Platform DevelopmentLocated in Los Angeles, United States (+5)From €19,998 for Cross Platform DevelopmentWorked in Media (+2)Speaks English, Spanish11-50 membersTOPS Infosolutions Pvt. Ltd.
(0 review)You think it, we build it
TOPS Infosolutions is an AI-focused software development company helping enterprises and growing businesses enhance customer experiences and drive innovative growth through intelligent solutions. Our core expertise includes: RAG as a Service Applied AI Solutions Generative AI Development Agentic AI Systems AI-Powered Software Development Web and Mobile Application Development E-commerce Solutions We build AI-driven web and mobile applications across industries such as e-commerce, healthcare, finance, education, transportation, retail, and manufacturing. Our team of experienced AI engineers, software developers, solution architects, and project leaders combines deep technical expertise with a strong understanding of real-world business challenges. As a long-term technology partner to global clients, we focus on transparency, agile execution, and outcomes that align with strategic business goals. For solutions like product strategy, MVP development, and enterprise-grade AI implementation, we ensure every solution is built for performance, scalability, and long-term value.Looking for work in Cross Platform DevelopmentLocated in Fremont, United StatesFrom €1,000 for Cross Platform DevelopmentWorked in Clothing & Accessories (+4)Speaks English201-500 membersTRIARE
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.Looking for work in Cross Platform DevelopmentLocated in Fairfax, United States (+3)From €5,000 for Cross Platform DevelopmentWorked in Hospitals & Healthcare (+20)Speaks English, Ukrainian51-200 membersRexsoft Inc
5(10 reviews)Your Growth Focused Web and Mobile Development Partner
Rexsoft is a custom software development company focused on building scalable digital products for startups and established businesses. For over 14 years, we have been helping companies turn ideas into structured, working systems - from MVPs to full-scale platforms. Our core expertise includes SaaS platforms, marketplaces, internal business systems (CRM/ERP), mobile applications, and AI-powered solutions. We specialize in projects where the complexity lies not only in the interface, but in the underlying logic, data consistency, and long-term scalability. We approach development as a business process, not just coding. That means we focus on: clear system architecture from the start structured data models and workflows scalability and maintainability aligning product decisions with business goals Our team includes experienced developers, project managers, and product specialists who work together to ensure that every solution is technically sound and commercially viable. We typically work in a structured process: intro call --> scope alignment --> detailed estimation --> phased development This allows our clients to fully understand the product before committing to development and reduces risk at every stage. Rexsoft is best suited for: startups building MVPs with long-term vision companies replacing or upgrading internal systems businesses looking to build scalable digital platforms We do not offer generic or template solutions - every product is built from scratch based on the specific business needs. Our goal is simple: build systems that actually work in real life, scale with the business, and create long-term value.Looking for work in Cross Platform DevelopmentLocated in New York, United StatesFrom €5,000 for Cross Platform DevelopmentWorked in Transportation (+12)Speaks English, Ukrainian51-200 membersEurisko
4.8(12 reviews)Pioneering digital innovation
Eurisko is a multi-national software development and consultancy firm based in UAE, Saudi Arabia, Lebanon, Cyprus and US. With more than 13 years of experience and hundreds of success stories, Eurisko offers services ranging from Mobile App Development, Enterprise Web Development and Artificial Intelligence, to Game Development, Mixed Reality, UI/UX Design and Smart Cities / IoT. To position our company as the pioneer of digital innovation in the region by creating excellence in our people and forging the digital future of our clients and partners. Our mission is to empower digital transformation by delivering cutting-edge solutions and world-class digital services to our clients & partners. Our goal is to reshape their success, providing them with a distinctive competitive advantage, unlocking limitless possibilities, and driving meaningful impact in their industry landscapes. Eurisko has a proven history of excellence in various domains and has been at the forefront of driving progress in Artificial Intelligence and Data Analytics for several years. Our proficiency in these areas allows us to harness state-of-the-art algorithms and data-driven insights, enabling us to deliver groundbreaking solutions to our clients. At Eurisko, our steadfast dedication to pushing the limits of innovation has firmly established us as a pioneering influence at the intersection of technology and creativity within the Middle East.Looking for work in Cross Platform DevelopmentLocated in Santa Clara, United States (+2)From €1,000 for Cross Platform DevelopmentWorked in Banking & Financials (+2)Speaks English, Arabic(+1)51-200 membersChudovo OÜ
5(21 reviews)Complex Systems Implementation
Highly recommendedTop awardedChudovo is a custom software development company, focused on complex systems implementation. Customers rely on our expertise, appreciate transparency in time, budget, visibility of work progress, and our assistance in achieving their business objectives with high-quality solutions. Our teams follow best development practices and methodologies and apply their experience in such industries as healthcare, finance, e-commerce, logistics, telecommunications, and others. In our portfolio, we have over 190 successfully implemented web, mobile, desktop, cloud, embedded, and AI projects. With our commitment to innovation, we bring together cutting-edge technologies, visionary strategies, and creative minds to breathe life into your visions and ideas.3 works in Cross Platform DevelopmentLocated in New York, United States (+4)From €3,000 for Cross Platform DevelopmentWorked in Hospitals & Healthcare (+19)Speaks English, German(+2)51-200 membersPastilla
(0 review)Full-service creative agency. Building brands, campaigns & platforms for the public good.
Top awardedPastilla is a full-service creative and digital agency with 20+ years of experience delivering trusted results for Fortune 500 companies and major public institutions. We offer branding, campaign strategy, web and app design, UX/UI, and digital communications, with a longstanding track record across government, education, healthcare, and nonprofit sectors. Our clients include Microsoft, SAP, VMware, Cedars-Sinai, City of Los Angeles, Santa Clara Valley Water, and Clean Power Alliance. By blending analytical approaches with human-centered practices, you can expect clear timelines, strong stakeholder management, and work that delivers measurable results.Looking for work in Cross Platform DevelopmentLocated in Pasadena, United StatesFrom €5,000 for Cross Platform DevelopmentWorked in Non-profit (+6)Speaks English, Chinese(+3)11-50 membersDebut Infotech
5(8 reviews)Results, Not Promises
RecommendedDebut Infotech is an AI-augmented blockchain and software development company helping organizations across financial services, healthcare, supply chain, and digital platforms build systems that perform reliably in complex, regulated environments. Founded in 2011 and blockchain-native since 2015, the company brings engineering discipline and technology depth to enterprises moving from fragmented pilots to production-grade systems. With delivery centers across the USA, UK, Canada, and India, Debut Infotech combines regional market understanding with globally distributed engineering capability — enabling clients to move with speed, consistency, and governance. Service areas: Artificial intelligence and generative AI — Enterprise LLM integration, AI agent development, retrieval-augmented generation (RAG) pipelines, predictive analytics, computer vision, and intelligent process automation embedded at the system architecture level. Blockchain and Web3 development — Smart contract engineering, DeFi protocol development, real world asset (RWA) tokenization, cryptocurrency exchange infrastructure, and enterprise blockchain on Hyperledger Fabric and Corda. Mobile application development — Native iOS, Android, and cross-platform applications (React Native, Flutter) architected for AI integration, enterprise-grade security, and sustained performance under production load. Web and software development — Full-stack web platforms, SaaS products, and enterprise software systems engineered API-first, designed for long-term maintainability and organizational scale Proven Delivery: $62M+ raised across client platforms including Ifinca, IntegraLedger, Everledger, and TĒM 90% customer success score across enterprise engagements 15 years of enterprise software delivery Fortune 500 clients and high-growth startups across 25+ industry verticals 50–249 engineers spanning AI, blockchain, and software disciplinesLooking for work in Cross Platform DevelopmentLocated in Cook County, United States (+2)From €10,000 for Cross Platform DevelopmentWorked in Others (+11)Speaks English51-200 membersAllusive Digital
(0 review)High-Performance Websites That Rank, Load Fast, and Convert
Allusive Digital is a web design and development agency focused on high-performance websites, enterprise SEO, and modern web applications for businesses across North America and the Asia-Pacific region. We build custom websites using WordPress, Shopify, and modern frameworks like Next.js and React. Every project starts with strategy—competitive analysis, UX planning, and technical SEO to ensure fast, conversion-focused websites with 95+ Google Lighthouse scores. Our SEO-first approach integrates technical SEO, Core Web Vitals optimization, keyword strategy, schema markup, and mobile-first development into every build. We help businesses grow through local and enterprise SEO strategies that drive measurable traffic and long-term results. We also develop high-converting e-commerce platforms on Shopify and WooCommerce, including custom themes, secure payment integrations, inventory systems, and conversion optimization. Using technologies like Gatsby, Contentful, Sanity, Netlify, and Vercel, we deliver fast, scalable websites with sub-second load times and reliable performance. We serve industries including fintech, healthcare, professional services, e-commerce, SaaS, real estate, media, and manufacturing across the USA, Canada, Australia, and New Zealand. Projects typically range from $5,000 to $40,000+, with clear timelines, transparent pricing, and no hidden fees. Allusive Digital combines performance, SEO, and modern development to deliver websites that rank, load fast, and convert. Get started with a free consultation and receive a detailed quote within 48 hours.Looking for work in Cross Platform DevelopmentLocated in Los Angeles, United States (+1)From €1,000 for Cross Platform DevelopmentWorked in Hospitals & Healthcare (+3)Speaks English11-50 membersCeladonsoft
5(7 reviews)Scalable systems for complex business operations — delivered with clarity and predictability.
We help growing and established companies turn complex software initiatives into clear, scalable, and well‑managed systems. Our job is more than just software design and development — our job is taking care of your success. We don't jump straight into development. We start with discovery, solution design, and business analysis to define scope, architecture, integrations, and priorities before a single line of code is written. This is how we reduce delivery risk and protect your budget. We focus on three solution domains: 1. Custom Business Systems & Operational Platforms 2. Mobile Products for Customers and Operations 3. AI‑Enabled Business Workflows (AI under senior engineering control) Our strongest industry experience is in Food & Beverage, Real Estate, and FinTech — with growing expertise in iGaming, EdTech, and Travel Tech. Why companies choose us: clarity before development, structured delivery with PM and QA, domain‑aware solutions, and AI‑accelerated senior engineering. We work best with growing mid‑market companies, multi‑location businesses, and organisations that have outgrown spreadsheets or disconnected tools. We work as an extension of your business, in tight communication and total transparency — so there's no waste of time on back‑and‑forth. Start with a Solution Discovery call – to clarify scope, architecture, and the right path before any build commitment.Looking for work in Cross Platform DevelopmentLocated in Tuckahoe, United States (+3)From €10,000 for Cross Platform DevelopmentWorked in Education (+23)Speaks English, German(+2)51-200 membersExtrovert Information Technology (EitBiz)
4.7(12 reviews)Empowering Businesses Through Cutting-Edge IT Solutions
Highly recommendedEitBiz is a digital transformation and product engineering company helping startups, SMBs, and enterprises turn innovative ideas into scalable digital products and business growth. Since 2017, we've successfully delivered 1,000+ projects for clients worldwide by combining technology expertise with a business-first approach. We partner closely with our clients to understand their goals, challenges, and long-term vision, delivering tailored solutions that improve operational efficiency, enhance customer experiences, and accelerate digital transformation. Our Services AI Development & Integration (Generative AI, AI Agents, Machine Learning, NLP & Computer Vision) Custom Software & Web Application Development Mobile App Development (iOS, Android, Flutter & React Native) SaaS & MVP Development Technology Consulting & Digital Transformation Business Process Automation Dedicated Development Teams & Staff Augmentation Why Choose EitBiz? 1,000+ Successful Projects Delivered End-to-End Product Development Expertise AI, Web, Mobile & Enterprise Technology Specialists Flexible Engagement Models & Dedicated Teams Focus on Measurable Business Outcomes Long-Term Technology Partnership Approach At EitBiz, we believe technology should solve real business challenges, not just build software. By combining strategy, design, engineering, and emerging technologies, we help organizations launch innovative products, modernize existing systems, automate processes, and create sustainable competitive advantages in an evolving digital landscape.Looking for work in Cross Platform DevelopmentLocated in Fort Wayne, United StatesFrom €3,000 for Cross Platform DevelopmentWorked in Others (+4)Speaks English51-200 membersLionwood.software
5(8 reviews)Find the Perfect Solution
Lionwood.software specializes in crafting custom software solutions tailored to meet the unique needs of businesses across various industries. Our expertise spans software development, application creation, IT solutions, and consultancy services. We have extensive experience building WMS, ERP, TMS, and CRM platforms. Many projects focus on transforming legacy software into cloud-ready architectures that improve performance, usability, and maintainability. Our services include: - Software Product Development Services; - Product Design Services; - MVP Development Services; - Web App Development Services; - Mobile App Development Services; - AI Software Development Services.Looking for work in Cross Platform DevelopmentLocated in New Castle County, United StatesFrom €5,000 for Cross Platform DevelopmentWorked in Marketing & Advertising (+10)Speaks English, Ukrainian51-200 members