Full-Stack React Web App (Next.js + Supabase)
A full-stack React web app with Next.js, Supabase & Vercel.
Greenlink Services · booking new projects
Next.js & React apps, built right and built fast
Senior full stack engineering without the agency overhead. One engineer with 20+ years of experience — architecture, code, deployment, and a track record you can verify.
20+ yrs
Software engineering
$300K+
Earned on Upwork
100%
Job Success score
3,892
Hours delivered
Services
Productized builds with transparent pricing
The same services I sell on Upwork, available directly. Fixed scope, fixed price, delivered fast — or contact me for custom work beyond these.
AI-Built / Vibe-Coded App → Production (Next.js)
Your AI-built or vibe-coded app taken to production on Next.js.
Add Supabase (Auth + DB + Storage) to a Next.js App
Supabase auth, database & file storage added to your Next.js app.
Integrate Stripe Payments & Subscriptions into a Next.js App
Stripe payments & subscriptions integrated into your Next.js app.
Figma to Next.js / React — Pixel-Perfect Responsive Frontend
Your Figma turned into a pixel-perfect responsive Next.js React frontend.
Landing Page (Next.js + Tailwind)
A custom, fast landing page built with Next.js and Tailwind.
Next.js Performance & SEO Optimization (Core Web Vitals)
Your Next.js site optimized for speed, SEO and Core Web Vitals.
Migrate Your Site / App to Next.js (WordPress, CRA, Vue...)
Your site or app migrated to Next.js from WordPress, CRA or Vue.
Example projects
Products people rely on every day
E-commerce, digital health, and regulated-industry platforms — designed, built, and shipped end to end.
Family Hardware
familyhardware.com ↗Design and Maintenance
Customer-facing e-commerce website for a brick-and-mortar hardware store — online catalog, checkout, and order fulfillment built on Next.js with Stripe and PayPal payments.
ReactNext.jsStripePayPal
MindApps.org
mindapps.org ↗Full stack developer
MIND is an interactive database that helps anyone find mental health and brain apps that meet the unique preferences and needs of each individual. Built with React, Next.js, and AWS Lambda for a Harvard-affiliated digital psychiatry lab.
ReactNext.jsAWS Lambda
Iris Online
irisonline.kobetron.com ↗Designed and developed from the ground up
Iris Online is a SaaS inventory tracking and regulatory compliance system created for casinos and regulators in the casino gaming space. At my previous employer I designed and developed this product from the ground up and helped launch it to a healthy annual revenue.
C#.NETSQL
Verify +
store.kobetron.com ↗Designed and developed from the ground up
Verify Plus is a software authentication tool used in the regulated casino industry to verify the integrity of software and hardware running in the field. I designed and developed the product, maintained it, and helped convert it from a free pricing model to annual recurring revenue with over 1,000 customers.
C#.NETWindows
GAT Image Repository
Database, services, and API design
The Game Authentication Terminal (GAT) Image Repository enables on-demand signature calculation and real-time software authentication on casino gaming floors via the GSA GAT protocol. I designed the database structures, Windows calculation services, upload utilities, and the API. It serves 6+ jurisdictions and supports testing revenue exceeding $1M annually.
C#.NETSQLWeb API
Client feedback
Verified reviews from real engagements
Quoted verbatim from public Upwork job feedback — 25 completed jobs, 100% Job Success.
“Knowledgable, efficient, very responsive and on time with deliverables.”
“Chris was one of the sharpest individuals I have ever encountered. It usually takes me an hour just to explain our project and stack because it is so complex.”
“Chris was absolutely fantastic in solving our problems and both designing and engineering the exact solution we needed.”
“Some people stand out more than the others and this is one of them. Chris is a rockstar.”
“Chris completed the project quickly and to the exact requirements. Everything works exactly as I hoped!”
“I didn't ever have to leave the Upwork messenger to get the job completed, which is a first; very excellent work overall, you can't go wrong with Chris.”
About
One engineer, the whole stack
Chris Van Emmerik — founder of Greenlink Services LLC.
I have 20+ years of experience and a B.S. in Computer Engineering from the University of Wyoming. My current focus is building high-performance web applications with React and Next.js.
You shouldn't have to choose between deep architectural experience and rapid delivery. I integrate AI-assisted tooling throughout my design and development workflow — from rapid prototyping to code review and testing. The result: faster delivery, fewer bugs, and more time spent on the architecture and UX decisions that actually matter for your product.
If you need a Next.js or React project built right and built fast, let's talk.
Core stack
Next.jsReactTypeScriptNode.jsC#SQLMaterial UIRedux.NET Core.NET FrameworkJSONSignalRMicrosoft SQL Server
Education
Bachelor of Science (BS), Computer Engineering
University of Wyoming · 2000–2004
Since 2017
Contract Software Engineer
Greenlink Services LLC · Feb 2017 – present
Previously
Software Engineer
Gaming Laboratories International · Oct 2004 – Feb 2017
Verified on Upwork
100% Job Success · Rising Talent
Identity verified · U.S. military veteran · 0-4 hours avg. response
Contact
Tell me about your project.
Describe what you need — a new build, a fix, a migration, or just a question — and I’ll reply with an honest assessment and next steps. Usually within a few hours.