All Full Stack Development Consultants in Seattle
Plavno
5(16 reviews)AI-First Software Company: Secure Agents, Voice Assistants, and Scalable Cloud.
Top awardedPlavno 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: Admin@plavno.ioLooking for work in Full Stack DevelopmentLocated in Alexandria, United States (+2)From €10,000 for Full Stack DevelopmentWorked in Others (+19)Speaks English, French(+2)51-200 membersInstinctools
5(10 reviews)Your AI-powered Engineering Partner
Top awardedMeet *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.Looking for work in Full Stack DevelopmentLocated in Potomac, United States (+4)From €10,000 for Full Stack DevelopmentWorked in Construction (+10)Speaks English, German(+1)201-500 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.Looking for work in Full Stack DevelopmentLocated in Warsaw, PolandFrom €3,000 for Full Stack DevelopmentWorked in Insurance (+6)Speaks English, German(+2)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.17 works in Full Stack DevelopmentLocated in New York, United States (+4)From €3,000 for Full Stack DevelopmentWorked in Hospitals & Healthcare (+19)Speaks English, German(+2)51-200 membersHalo Lab
5(12 reviews)Transforming your product idea into reality through custom design-driven development.
Highly recommendedTop awardedHalo Lab is an award-winning custom web app design and development company ⭐ Our team offers reliable, customized, and user-friendly solutions for your business. We transform your product ideas into reality with our expert, design-driven development approach. Let us bring your vision to life with our innovative and tailored services. WE ARE YOUR PARTNER IN: ✅ Enhancing user experiences with UI/UX design. ✅ Building your brand identity. ✅ Growing your online presence with website development. ✅ Creating smooth digital experiences with full-cycle web app development. ✅ Ensuring top-notch quality with QA. ✅ Boosting growth and visibility with SEO & marketing support. Let’s create your star with us.Looking for work in Full Stack DevelopmentLocated in Burlingame, United States (+4)From €10,000 for Full Stack DevelopmentWorked in Others (+18)Speaks English51-200 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.1 work in Full Stack DevelopmentLocated in New York, United StatesFrom €5,000 for Full Stack DevelopmentWorked in Transportation (+12)Speaks English, Ukrainian51-200 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 disciplines1 work in Full Stack DevelopmentLocated in Cook County, United States (+2)From €10,000 for Full Stack DevelopmentWorked in Others (+11)Speaks English51-200 membersNTSprint
(0 review)Maximize Ideas!
NTSprint is an IT company founded in the State of Washington, United States, in 2016. It is designed to be a digital transformation partner for small and medium-sized businesses (SMBs) and growing companies. Over the years, NTSprint has maintained a loyal customer base through its winning formula of excellent IT service at a fair cost. We are proud to incorporate best practices and standards to align our results with the rest of the sector and deliver value from the beginning of each partnership.Looking for work in Full Stack DevelopmentLocated in Seattle, United StatesFrom €1,000 for Full Stack DevelopmentWorked in Entertainment & Events (+1)Speaks English, Spanish51-200 membersDot Com Development
5(10 reviews)Building smarter digital products that launch faster and perform better.
Top awardedDot Com Development is a full-service Web, Mobile, Cloud, and AI development company delivering high-performance digital solutions for startups, SMBs, and enterprise clients. Since 2004, the company has specialized in transforming complex business challenges into intuitive, scalable, and secure applications that drive real results. With a business-focused approach and a proven record of on-time, on-budget delivery, Dot Com Development combines technical expertise with strong UX, product strategy, and long-term support to ensure every project succeeds beyond launch. Dot Com Development gets digital products to market up to 50% faster than competing firms, reduces development costs by as much as 40%, and delivers user experiences that generate 5x more user engagement. Our services include: ✅ Strategic Planning and Consulting ✅ UX/UI Design ✅ Prototyping and POC's ✅ Web Application Development ✅ Website Design and Development ✅ Mobile Application Development ✅ Artificial Intelligence Development ✅ eCommerce Development ✅ API Development and Integration ✅ Data and Analytics ✅ Cloud Development ✅ CRM / ERP Development ✅ DevOps / Cloud Services ✅ Support and MaintenanceLooking for work in Full Stack DevelopmentLocated in Scottsdale, United StatesFrom €5,000 for Full Stack DevelopmentWorked in Industrial Goods & Services (+11)Speaks English11-50 membersDelante SEO/SEM Agency
4.9(97 reviews)Delante: SEO, SEM & AI Search in one Search Agency - focused on results, growth, and business impact
Highly recommendedTop awardedDelante is an award-winning international Search Agency specializing in SEO, SEM, and AISO (AI Search Optimization). With offices in Kraków, New York, London, Italy, Spain, we support global brands across 29 global markets. Our +65 experts create tailored strategies focused on business impact - not vanity metrics . We know that marketing has to pay off. That’s why we track ROI, ROAS, and CAC to ensure our clients’ investments generate measurable growth. From increasing visibility to scaling international sales, our result-oriented and data-driven approach makes us the trusted partner behind the success of global e-commerce and B2B leaders. Our strategies have earned us recognition from Top International Awards, including: 🏆 Forbes Diamonds 2025 🏆 Deloitte Technology Fast 50 Europe 🏆 Financial Times FT1000 🏆 Google Premier Partner - Top 3% of Agencies Worldwide 🌍 🏆 Global Search Awards 2024 - SEO Agency of the Year 🏆 European Search Awards 2024 🏆 Global Agency Awards 2024 - Best B2B SEO Agency of the Year 🏆 Global Digital Excellence Awards 2024 More visits, more sales - let’s get you in the lead! Forward is our only direction - because Delante means Forward. It’s our can-do-attitiude mindset.Looking for work in Full Stack DevelopmentLocated in New York, United States (+3)From €1,000 for Full Stack DevelopmentWorked in Clothing & Accessories (+8)Speaks English, Polish51-200 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.18 works in Full Stack DevelopmentLocated in Tuckahoe, United States (+3)From €10,000 for Full Stack DevelopmentWorked in Education (+23)Speaks English, German(+2)51-200 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 Full Stack DevelopmentLocated in New Castle County, United StatesFrom €5,000 for Full Stack DevelopmentWorked in Marketing & Advertising (+10)Speaks English, Ukrainian51-200 membersCOAX Software
4.8(10 reviews)Smart software solutions for travel, transport & logistics
COAX Software is your partner for smart software solutions for travel, transport & logistics. Since 2010, we’ve helped industry leaders design, build, and scale products that move markets forward. From sleek mobile apps to enterprise platforms, we deliver end-to-end development, team acceleration, and AI-driven solutions engineered to be reliable, scalable, and ROI-positive. Our integrated approach connects strategy, delivery, and growth—so your product ships faster, performs better, and compounds value over time. 🏆 Top-Rated Agency on Upwork 🏆 Experts Team with 100% Job Success Rating 🏆 16 000+ delivery hours on Upwork 🏆 Net Promoter Score 9.8/10 🏆 4.9/5 at Clutch.co What makes us different: - Deep Travel & Logistics Expertise We understand bookings, reservations, fleet management, customer loyalty, and compliance. We design solutions tailored to travel and transport operations—so your customers get seamless digital experiences. - AI & Automation at the Core From AI chatbots for customer care to predictive analytics for demand forecasting—and retrieval-augmented search for ops knowledge—we apply responsible AI practices to deliver measurable impact. - Flexible Partnership Models Choose what fits now and scales later: Discovery packages, fixed-scope acceleration, or dedicated squads. Need a quick MVP or expert consulting? We adapt to your goals and pace. - Proven Track Record 15+ years, hundreds of deliveries, and a team that’s 90% mid/senior. We’re known for on-time, on-budget execution and outcomes that compound. - Global Outlook, Remote DNA Rooted in Ukraine and delivering worldwide, we operate remote-first - combining nearshore accessibility with global reach. We’re certified and partnered: ISO 9001 - international standards of quality management ISO/IEC 27001 - international standards of information security AWS Certified Solutions Architect AWS Certified AI Practitioner Early Adopter Professional Scrum Master™ I Member of the techUK trade associationLooking for work in Full Stack DevelopmentLocated in Ivano-Frankivsk, UkraineFrom €2,000 for Full Stack DevelopmentWorked in Software & Computer Services (+6)Speaks English, Ukrainian51-200 membersFulminous Software
5(38 reviews)WE LOVE TO BUILD ASK FOR IT AND HAVE IT
Top awardedWe are Fulminous Software, a skilled web and mobile app development company with a proven history of creating popular and profitable apps. We're known for our knack for enhancing existing apps and websites to make them even better, ensuring people keep downloading and enjoying them. Our dedicated team is here to turn your ideas into reality. The company’s biggest strength is its team which I a mix of most ingenious and focused individuals who are adroit in whatever they do. They believe in delivering flawless and reliable solutions to clients that match business needs and drive business growth. We are looking for strategic partnerships from around the globe. If you are interested please contact us today. Client's Feedback About US: https://clutch.co/profile/fulminous-software-private#highlights https://www.bark.com/en/in/company/fulminous-software-private-limited/9AKJO/ Our Key services: * Custom Software development * Mobile App Development (Android App, iPhone App, Cross-Platform App) * Custom Game Development (AR, VR, iOS, Android, NFT, Metaverse, 2D, 3D) * Salesforce Development (Lightning, Implementation, Consulting) * Web Development * Mobile Game Development * Desktop Game Development * Xamarin App Development * Wearable Devices App Development * Enterprise App Development * CRM & ERP Development * Digital MarketingLooking for work in Full Stack DevelopmentLocated in Clarendon County, United States (+2)From €1,000 for Full Stack DevelopmentWorked in Video games (+9)Speaks English51-200 membersELEKS
5(1 review)Your trusted partner for guaranteed software delivery
Top awardedELEKS is your trusted partner for guaranteed software delivery. Combining over 30 years of industry insight with cutting-edge AI technology, we help businesses worldwide deliver their unique software vision through bespoke full-cycle solutions.Looking for work in Full Stack DevelopmentLocated in Las Vegas, United States (+14)From €20,000 for Full Stack DevelopmentWorked in Energy & Oil (+10)Speaks English, German(+1)1001-5000 membersvareweb
4.9(5 reviews)"Magically Designed Website"
RecommendedMark Your Digital Visibility Through the Power Of Our "Magically Designed Website" Kick start your dream with our magically designed website, a valuable investment that promises lasting benefits. As your business flourishes, so does your digital identity and to keep it ahead of the race, trust our designer’s magical expertise to achieve your business goals from our spectrum of designing website UI, logos, infographics, banners, brochures, social media posts and much more. This is the time to activate your digital presence through the power of captivating designs to boost your digital persona and fascinate your clientele. Personalized Designs We appreciate your concise input to empower your business niche with personalized designs that meet your main visual requirements, effectively targeting your audience with a lasting impact. Result Driven Designs Our mission goes beyond mere satisfaction; we are dedicated to building an empire for your brand through the magical touch of our designers. Our goal is to not only meet your expectations but also to exponentially drive your Return on Investment (ROI) to new heights. Multiple Design Concepts Get multiple design concepts through the magic of our designer's artistic hands within a day's deadline. Each concept will be meticulously crafted to perfection, ensuring attention to detail down to each pixel.Looking for work in Full Stack DevelopmentLocated in Dallas, United StatesFrom €500 for Full Stack DevelopmentWorked in Hospitals & Healthcare (+7)Speaks English11-50 membersProbey Services
5(132 reviews)World’s #1 Rated & Reviewed App & Web Development Partner
Highly recommendedTop awardedWorld’s #1 Rated & Reviewed App & Web Development Partner , Probey Services is a renowned IT and digital solutions provider , powering innovation for startups, SMEs, and growing organizations worldwide. Headquartered in London, UK , with a strong presence in India and 11 global branches, we combine global reach with deep technical expertise. Our 320+ specialists have successfully delivered 1900+ projects over the last 10+ years , helping businesses scale with mobile app development, website design & development , enterprise software solutions, AI-powered digital marketing, branding, and social media management. We proudly serve 30+ industries including retail, e-commerce, healthcare, fintech, education, travel, logistics, luxury, and more. Probey Services is rated as the #1 Tech Partner globally on Clutch, GoodFirms, and Trustpilot , we stand out for our system-driven execution, advanced tech stack, and client-first approach. Our Services: We deliver end-to-end digital solutions that don’t just work, they win. Mobile Apps – iOS & Android (React Native, Flutter, Kotlin, Swift, Java). Websites – Fast, stunning, conversion-driven (Shopify, WordPress, Magento, Joomla, Wix, Umbraco). Custom Software – ERP, CRM, SaaS, and cloud platforms (React, Node.js, Angular, .NET, Python, PHP, Ruby, Java). Digital Marketing – AI-powered SEO, PPC, and performance campaigns (SEMrush, Ahrefs, Moz, Google Ads, Analytics). Branding – Logos, identity kits, merchandise, collaterals (Figma, Adobe Suite, CorelDRAW). Social Media – Strategy, UGC/CGC, influencer collabs (Instagram, LinkedIn, YouTube, Pinterest). Awards & Recognition: Proudly recognized worldwide: Top Mobile App Development Company – Clutch (2025) Best Web & Design Agency – DesignRush (2024) Global Leader – GoodFirms (2024) Top 10 IT Companies – G2 (2024) Excellence in Digital Innovation – AppFutura (2024) Clutch Global & Champion Badge (2023 & 2024 )Looking for work in Full Stack DevelopmentLocated in New York, United States (+4)From €100 for Full Stack DevelopmentWorked in Clothing & Accessories (+16)Speaks English, Dutch, Belgium(+5)201-500 membersAppCrops
5(58 reviews)Turning Ideas Into Interactive Solutions
Highly recommendedAt AppCrops, we go beyond development. We partner with businesses to design, build, and scale powerful digital products that drive real growth. Our team of top app developers, UI/UX designers, and business analysts combines strategic thinking with technical excellence to deliver solutions that are both innovative and reliable. Our mission is simple: to help businesses streamline operations, unlock new opportunities, and stay competitive in an increasingly digital world. From startups to enterprises, we provide end-to-end technology services designed to turn ideas into scalable solutions. Core Services Mobile App Development High-performance iOS, Android, and cross-platform mobile applications designed with user experience, scalability, and reliability in mind. Web Design & Development Modern, responsive websites and web applications built for performance, usability, and scalability. Designed to strengthen your online presence and convert visitors into customers. Custom Software Development Secure, scalable, and tailor-made software solutions built around your specific business requirements from enterprise platforms to specialized digital tools. ERP Systems & Enterprise Solutions Robust ERP platforms that centralize business operations, streamline workflows, and improve organizational efficiency. Startup Solutions & MVP Development We help startups move from concept to launch by building scalable MVPs, validating product ideas, and preparing platforms for growth. UI/UX Design Human-centered design that focuses on usability, clarity, and visual impact to create intuitive digital experiences. Digital Transformation Consulting Strategic guidance to help businesses adopt modern technologies, optimize processes, and successfully navigate digital transformation. Why Partner with AppCrops • Agile development process • Collaborative approach • Experience across industries • Transparent communication and project delivery • Competitive pricing without compromising qualityLooking for work in Full Stack DevelopmentLocated in South Houston, United StatesFrom €1,000 for Full Stack DevelopmentWorked in Clothing & AccessoriesSpeaks English51-200 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 Full Stack DevelopmentLocated in Lodi, United States (+3)From €5,000 for Full Stack DevelopmentWorked in Household Products (+12)Speaks English, Arabic11-50 membersRealweb
4.7(1 review)Leading AI Solution Provider Empowering Enterprise Expansion
Realweb Tech is a software consultancy that provides advanced AI, custom app, web, and IoT solutions to help midsize and enterprise businesses grow. Since 2018, our skilled and diverse team has focused on building scalable, secure, and future-ready technologies that improve operations and boost customer engagement, even in highly regulated and complex industries.Looking for work in Full Stack DevelopmentLocated in Columbia, United States (+1)From €1,000 for Full Stack DevelopmentWorked in Legal Services (+7)Speaks English11-50 members