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About Me I have 25+ years of experience in partial CTO, CEO, Mobile App Development Project Management, specializing in Android, iOS, & Cross-Platform App Development using Java, Kotlin, Swift, Objective C, React Native, Redux Flutter, Firebase, Mongo Db, User Authentication, EHR, FHIR, HL7, HIPAA compliance, Typescripts, and AI-driven applications. My expertise spans iOS & Android development, AI-powered solutions, seamless authentication systems, and full-stack capabilities, ensuring modern, high-performance apps for businesses of all sizes. Our Agency Since July 2017, my wife, our talented 55+ team members, and I have been delivering world-class digital solutions. - 150+ apps successfully delivered across multiple platforms in the last year - $4M+ turnover on Upwork - 500+ successful projects, 15,000+ hours worked - Close to a 100% success rate - Worked with 7, 8, and 9-figure businesses Our Expertise Mobile App Development • Android, iOS, & Cross-Platform Apps (Java, Kotlin, Swift, Objective C, React Native, Flutter) Web & Full Stack Development • Front-End: React.js, Angular.js, Next.js, WebRTC • Back-End: Node.js, Firebase, MongoDB, PostgreSQL • Cloud Deployment & API Integrations E-commerce & CMS Development • Shopify Developer & Customization • WordPress Developer & WooCommerce Solutions UI/UX Design & Branding • Adobe XD, Figma, Photoshop, Sketch Digital Growth & Security • SEO & Digital Marketing Optimization • Data Security & Intellectual Property Protection Intellectual Property Services • Trademark & Copyright Assistance Why Choose SolidAppMaker? - Tailored Approach: Every project is customized to fit your needs and budget. - Agile Workflow: Regular updates, milestones, and transparent communication. - High-Quality Development: Rigorous testing & performance optimization. - Competitive Pricing: Top-tier services at fair and transparent pricing. - Proven Track Record: Experience with MVPs, SaaS platforms, AI-driven apps, and enterprise solutions. Why SolidAppMaker Stands Out - 8+ years of expertise in UI/UX, mobile apps, SaaS & web development - 510+ projects successfully completed for startups & enterprises - 10+ awards & recognitions, featured on Upwork & top design platforms - 50+ countries served, delivering top-tier prototyping & development solutions Proven Results: - SaaS UI/UX enhancements boosted retention by 60% - Mobile UI redesigns reduced churn by 40% - Web App UX improvements increased task completion by 90% - eCommerce UI revamps increased sales by 70% Industries We Cover Healthcare, Transport, Retail, Asset Management, Real Estate, Dating, Nature/Wildlife, Rental, Food Delivery, Fintech / Finance and Banking, Cryptocurrency, Entertainment, Hospitality, Logistics, Manufacturing, Media and Publishing, Non-Profit, Sports and Fitness, Travel and Tourism, Utilities, Wellness, Medical Dashboard, Marketplace, Advertising, Automotive, Business Innovations, Ecology, Human Resources, LegalTech, Lifestyle, Fashion, Marketing, Navigation, Education, E-learning. Highlighted Skills Project Planning, MVC Architecture and RESTful APIs, Front-end Technologies (React.js, HTML5, CSS3, JavaScript), Responsive and Mobile-first Design, Database Design and Implementation (MongoDB, Firebase), User Authentication, Integration of Third-party APIs, Deployment to Cloud Platforms (AWS), Test-driven Development, Agile Methodologies (Scrum, Kanban), Security Technologies, QR Code Scanner, GPS and Mapping, Blockchain and NFT, ChatGPT and Artificial Intelligence. Flutter Developer 10+ years of experience As a Mobile App Developer and Full Stack Developer with deep expertise in SaaS Mobile App, ReactNative App I bring over a decade of experience in building high-performance cross-platform mobile application. As a talented Flutter Developer with good knowledge of cross-platform development, I specialize in crafting high-performance mobile apps for both iOS and Android platforms. I made more than 400 apps using Flutter. Flutter is my main tech stack, I helped dozens clients making top-performing apps using Flutter. I am a dedicated mobile app developer with extensive experience building cross-platform apps in Flutter, React Native, and Expo. As a full stack developer, I combine clean front-end design with robust back-end systems using Laravel, Node.js, or Firebase to deliver high-performance mobile solutions. FlutterDeveloper MobileApp AndroidDevelopment IOSDeveloper. Next Steps – Let’s Build Something Amazing! 📅 Would you be available for a 30-60 minute free consultation? During this meeting, we will: - Go over your project goals, technical needs, and budget. - Provide a project plan with a timeline and cost estimate. - Discuss the best development approach to fit your vision. 📩 Send me a message, and I’ll share the Upwork scheduler link so we can set up a time that works best for you. Looking forward to collaborating and creating something extraordinary! Best regards, John H Fijen

I’m a solo WordPress and Shopify developer who helps businesses fix what’s broken, build what’s needed, and move forward without chaos or surprise costs. A lot of clients come to me after struggling with unclear scopes, half-finished sites, or fixes that didn’t stick. My approach is simple: start with a clearly defined first task, stabilize what matters, and only expand scope once everything is understood and agreed on. What I typically help with: • WordPress and WooCommerce fixes, cleanup, and completion work • Shopify theme customization, bug fixes, and store stabilization • Small, well-scoped builds or rebuilds • Performance, layout, and plugin/app conflicts • Ongoing support after an initial task is complete For larger projects, I prefer to start with a short Phase 1 (audit, cleanup, or setup) so there are no surprises. For smaller issues, I’m happy to help with a focused introductory task to get things moving quickly. I work directly with clients (not an agency), communicate clearly, and respect scope boundaries. If you’re looking for someone dependable who finishes what they start and explains what’s happening along the way, I’m happy to help.

I am tech startup founder and expert in sales/marketing operations, product development, UX, and managing the customer experience. I can improve user experience by designing wireframes and prototypes with the goal of delivering the right solution. I can also help you maximize business revenue by enabling your sales & marketing teams to improve processes with systems for prospecting, reporting, and deal management. --- Sales & Marketing Operations. I'm good at helping small to medium size companies optimize their sales and marketing tools. For over 10 years I have used HubSpot. I was an early customer of theirs and I've done everything you can imagine to make the tool work for my other company. I am HubSpot Marketing and Sales certified and I have a knack for all things sales/marketing ops. In addition to creating sales and marketing dashboards with custom reports, I have most recently used Pendo, Zapier, and HubSpot to create HubSpot Workflows that automatically create Tasks, notifications, and Deals for users that have engaged with our software in particular modules. I have built email templates, managed custom imports, performed data cleanup, built sequences, and defined personas, funnels and custom fields. --- CX/UX & Product My passion for customer experience and UX has has also driven me to implement user centered design (UCD) concepts like UX research, prototyping, and extensive usability testing. Using Figma, Sketch or Axure, I can build clickable prototypes and help software companies validate their ideas and test for usability. This greatly reduces the chance you will ship something customer don't love or can't use. Backing up a bit into the UCD process I've also performed research through in-depth user interviews to help inform business objectives. Qualitative research is always more time-consuming than quantitive (like surveys) but I find it help you understand the customer better and uncover unmet needs in the process. --- Why work with me? Experience and range. I will not only dig in and to the work, but you'll get my 15+ years of start up experience. If there's a mistake to be made in building software, I've done it. My mistakes are an advantage you'll have with me by your side.

Expertise in providing new product design/development and integrated engineering services to help companies build better products, get them to market faster, and save money. Expert in product design using Creo - Pro/ENGINEER and in integrating CAD/CAM - CAE solutions into organizations. Expert in providing customized training services. Seasoned speaker at numerous National and International conferences. Photorealistic rendering expert for conceptual & product marketing purposes. Note that all images in my Upwork portfolio are computer-generated renderings.