Top Web App Development Agencies in California

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Top Featured Web App Development Agencies

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.
19 works in Web Application
Located in Cherkasy, Ukraine (+3)
From €10,000 for Web Application
Worked in Beverage (+20)
Speaks English, Ukrainian
51-200 members
Duck.design
4.7
(29 reviews)
You need design done. Just get it!
Highly recommended
Top awarded
Your brand designs are too important to be left in the hands of unreliable freelancers or expensive creative agencies. Why not hire an experienced, full-time designer who knows you by name and your brand by heart? Since its creation, Duck.design has been able to capitalize on a number of areas that currently constitute its strength: - Logo, Brand Guide, Style Guide; - Graphic Design; - Web Design; - UI/UX Prototyping; - 3D Design; - Game design; - Explainer Video, 2D Animation, GIF.
Looking for work in Web Application
Located in Greater London, United Kingdom
Budget on request
Worked in Banking & Financials (+8)
Speaks English
51-200 members
U1CORE
5
(16 reviews)
U1CORE — A product studio for multi-sided platforms. Marketplaces, exchanges, auctions, fundraising
Highly recommended
Top awarded
YOUR PARTNER TO BUILD MULTI-SIDED PLATFORMS $720M moved through one platform we built. Millions of live listings on another. 300+ products shipped. 🔔 Book a free call: https://calendly.com/hello-u1core/30min 🌐 https://www.u1core.com/ What you get We do: the full platform. Multi-role flows, payments, trust & safety, admin tooling, infrastructure that holds at peak load. You get: a product decision-makers trust on first impression, and users who move through it without friction. So you can: grow revenue, close your round, automate operations, and charge a premium. Services Product Design: UI/UX, design systems, prototyping, platform-native patterns for marketplaces, auctions, exchanges, donation flows. Product Engineering: React, Next.js, Vue; Node.js, Python, .NET; mobile, payments, multi-role architecture, admin tooling, DevOps. Discovery & Strategy: cold-start strategy, trust & safety, take-rate modeling, MVP scoping, UX audits. Custom Development: marketing sites and landing pages for platform companies. Why founders pick us One lane. Marketplaces, exchanges, auctions, donation platforms. We already know how products in your category delivered. We lead. We arrive with a point of view, flag what won't work, and explain why. One team, kickoff to launch. The product you ship is the product we built. Twice the pace. Six weeks where others quote three months. $720M+ processed. CSS Design Awards (2× Site of the Day, 4× Best UX, 4× Best UI, 4× Best Innovation, 4× Special Kudos), Orpetron, TOP 10 on Dribbble. 300+ clients, and the ones who matter come back. If your product only works when two sides of a market trust it at the same moment, that's our entire job. Let's talk.
1 work in Web Application
Located in London, United Kingdom
From €10,000 for Web Application
Worked in Banking & Financials (+15)
Speaks English
11-50 members
SaM Solutions
5
(3 reviews)
SaM Solutions is an international provider of IT services and software solutions with over 30 years
Recommended
Top awarded
We 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.
23 works in Web Application
Located in Gilching, Germany (+5)
From €10,000 for Web Application
Worked in Software & Computer Services (+23)
Speaks English, German(+2)
501-1000 members
Bintime
4.7
(1 review)
Strategy that ships. Continuity that lasts.
Bintime is a Dutch-founded custom software development and IT consulting company for data- and object-heavy enterprises — manufacturing, distribution, logistics, energy, food & beverage, E-commerce&retail and other industries. We help businesses where SKUs, objects, and operational data outgrow off-the-shelf tools turn complex data into production-grade software, web and mobile applications, and AI agents that deliver measurable business outcomes — then stay to run them. Our services: - Custom software development and enterprise platform engineering - Web and mobile app development for high-volume, high-SKU systems - Data engineering, system integration, and PIM / e-commerce solutions - AI consulting and custom AI agent development — agentic automation on your existing stack, measured by outcomes, not demos - EU product-compliance automation, including end-to-end EPREL (European Product Registry for Energy Labelling) registration - Embedded senior engineering teams and dedicated development pods that ramp in week one Two routes to the result: we build custom where you need it, or extend our own data products — Gepard PIM and B-Hive — where they fit. One partner, either path. Why clients choose Bintime: - 20+ years with high-volume, high-SKU, data-intensive systems - 00+ engineers across Europe - ISO 27001 certified - 10+ year average client relationship — we own the outcome, not just the ticket Selected clients include Icecat, PriceSpider, Futurumshop, and Dustin. Headquartered in the Netherlands with delivery across Europe, Bintime pairs strategic advisory with hands-on engineering: we help you decide what to build, ship it, and evolve it over time. Unlike large consultancies, we actually build. Unlike AI-hype vendors, we deploy automation that works in production. If your growth is limited by messy operational data, delivery capacity, or EU compliance deadlines, Bintime is the long-term partner that turns those constraints into working systems.
6 works in Web Application
Located in Nieuwegein, Netherlands
From €5,000 for Web Application
Worked in Retail (+1)
Speaks English, Ukrainian
51-200 members
Rohmate
5
(2 reviews)
Digital Growth, Web, SEO & Custom Software Agency
Recommended
Rohmate is a digital growth and technology company helping startups, local businesses and growing enterprises build scalable online presence and modern digital ecosystems. We specialize in website development, SEO, AI automation, branding, custom software development, cloud infrastructure, managed IT services, growth marketing and creative production. Our approach combines technology, strategy, automation and performance-driven execution to help businesses improve visibility, streamline operations and accelerate long-term growth. From responsive websites and SEO optimization to AI-powered workflows, cloud solutions and scalable software systems, Rohmate delivers practical solutions tailored to modern business needs. We work with brands looking to strengthen their digital presence, improve customer engagement and create sustainable growth systems through technology and strategic execution. Core Services: • Website Design & Development • SEO & Growth Marketing • AI Automation Solutions • Branding & Creative Services • Custom Software Development • Cloud & Managed IT Services • Video Production & Animation • Business Consulting & Digital Strategy Looking for a reliable digital growth and technology partner? Connect with Rohmate to build scalable, performance-focused digital solutions for your business.
3 works in Web Application
Located in Surat, India
From €5,000 for Web Application
Worked in Retail (+7)
Speaks English
51-200 members

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