Websites Engineered as Working Software. Built to Run Your Business—Not Sit as a Static Digital Brochure.
Back in 1998, when we built one of Rhode Island’s earliest statewide searchable MLS websites (RILiving.com), we learned a lesson that has guided our work for 29+ years: a website that solves a real problem for the visitor will outperform a static digital brochure every time.
Today, we engineer 25 to 60+ route custom React 19, TypeScript, and PostgreSQL web applications—combining interactive sizing and pricing calculators, live regional data feeds, brand-themed Client Operations Portals (/portal), point-and-click Visual Pin Board collaboration, and complete code and database ownership.
Build-time HTML prerendered routes covering your service verticals, technical guides, interactive calculators, and regional corridors.
Custom React/TypeScript sizing estimators, contractor operations portals, live weather/outage pages, and multi-step RFQ tools.
You own your custom frontend code, domain, and PostgreSQL database records outright, with our portal suite included on our managed plan.
Backed by our 29-year operational record, 5-source 301 redirect cutover protection, and 60-second health monitoring.
Give Buyers a Working Tool They Can Use— And Give Your Team an Operations Portal That Runs the Business.
Most agency websites are five-to-ten page digital brochures that say “Call for a Quote.” They don't help a customer size a job, compare specifications, or check live regional status—and they don't give your staff any internal tools to manage leads, quotes, or revisions.
Every platform we engineer combines custom interactive frontend tools for your customers with our reusable backend portal suite for your team:
Custom Calculators, Estimators & Live Regional Feeds
We engineer tools tailored to your exact industry—from commercial 480V load calculators and live 169-town power outage hubs (/no-power-ct/) to crane rigging estimators, geothermal BTU planners, and multi-tenant loyalty analytics (PointsTracker.com). Visitors stay on your site longer and convert at a higher rate because your site actually helps them plan their project.
Brand-Themed Client Portal, Visual Pin Board & Leads CRM
Instead of bolting together fragile third-party plugins, every custom build includes our integrated backend portal suite—giving you a dedicated single-tenant PostgreSQL database, a Brand-Themed Client Operations Portal, database-first Lead & Quote intake, 4 payment gateways + WHMCS, and our point-and-click Visual Pin Board.
Full Build-Time HTML, Schema @graph & /llms-full.txt
We prerender every public route into complete, fast HTML at build time—paired with unified Schema.org JSON-LD @graph markup and machine-readable /llms.txt and /llms-full.txt manifests—so Google, Bing, ChatGPT, Claude, and Perplexity can read and cite every specification across your 25 to 60+ routes.
Six Architectural Pillars Built Into Every Custom Platform
Every web application we engineer is built around six core standards for route depth, interactive utility, search visibility, and clean code ownership.
25–60+ Prerendered Route Depth
Every service line, industry vertical, regional corridor, and reference guide is prerendered into complete HTML at build time so search engines and AI crawlers read the full text without executing JavaScript.
Interactive Domain Calculators & Portals
Custom React/TypeScript tools (480V load planners, contractor operations portals, hotel stay yield analytics, crane rigging estimators) that solve practical problems right in the browser.
Backend Portal Suite Included
Every custom build includes our Brand-Themed Client Operations Portal, point-and-click Visual Pin Board, database-first Leads CRM, and 4 payment gateways + WHMCS (/platform-modules).
Structured Data & AI Discovery (/llms-full.txt)
Unified Schema.org JSON-LD @graph markup paired with machine-readable /llms.txt, /llms-full.txt, and /specs.json summaries so Google, ChatGPT, Claude, and Perplexity index your capabilities accurately.
5-Source Pre-Cutover 301 Redirect Matrix
Historical URL inventory compiled from your current site, XML sitemaps, Wayback archives, Search Console, and server logs—mapped to permanent 301 redirects before DNS cutover.
Clear Code Ownership & Portability
You own 100% of Layer A (your custom frontend application, copy, domain, and single-tenant PostgreSQL database records) from day one, while our Layer B portal suite is included on our managed plan.
Side-by-Side: Standard Brochure Website vs. GreenTree Web Application
| Engineering Dimension | Standard 5–10 Page Brochure Website | GreenTree Custom Web Application |
|---|---|---|
| Core Purpose & Architecture | 5-to-10 page informational site ("Home, About, Services, Gallery, Contact") built on a general-purpose CMS theme or page-builder template. | ✓ 25 to 60+ route custom React, TypeScript, and PostgreSQL web application architected around how your buyers evaluate specs, calculate costs, and request service. |
| Interactive User Utility | Static text and stock photos asking visitors to "Call for a Quote" without interactive sizing, scheduling, or pricing tools. | ✓ In-browser calculators, ROI/TCO estimators, live regional status pages, technical specification directories, and brand-themed Client Operations Portals. |
| Admin Portal, Collaboration & CRM | Heavy third-party plugin stacks that require constant patching and separate monthly subscriptions for forms, ticketing, and review tools. | ✓ Includes our backend portal suite (/platform-modules): Brand-Themed Client Operations Portal, point-and-click Visual Pin Board, Leads CRM, and 4 payment gateways + WHMCS. |
| Search & AI Answer Readiness | Basic meta tags or client-only JavaScript shells (<div id="root"></div>) that search engines and AI crawlers cannot read without executing scripts. | ✓ Build-time HTML prerendering across every route + Schema.org JSON-LD @graph + /llms.txt, /llms-full.txt & /specs.json manifests for Google, ChatGPT, Claude, and Perplexity. |
| Code Ownership & Portability (Layer A + B) | Tied to proprietary page-builder templates, plugin licenses, or agency lock-in where exporting clean source code is difficult. | ✓ You own 100% of Layer A (your custom frontend code, copy, domain, and single-tenant PostgreSQL database records) from day one, while our Layer B portal suite is included on our managed plan. |
| Domain Cutover, Hosting & Email | Unmapped legacy URLs returning 404 on launch day, paired with generic shared hosting and unconfigured email authentication. | ✓ 5-source legacy URL audit with permanent 301 redirects, persistent cloud hosting (checked every 60 seconds), 1 SmarterMail Enterprise mailbox included, and additional @yourdomain.com accounts at $6–$18/mailbox. |
How We Engineer and Launch Your Custom Platform
With 29+ years in web technology since 1997 and operating as GreenTree Hosting, LLC since 2007 across physical data centers and managed Linux cloud infrastructure, Gene & Maureen Salvatore follow a clear four-phase deployment protocol.
We Map Every Legacy URL and Architect Your 25–60+ Route Footprint
Before changing a single DNS record, we inventory your existing URLs across live crawls, XML sitemaps, Wayback archives, Search Console, and server logs to build a zero-404 redirect matrix—and map out your new service verticals, regional corridors, and interactive tools.
- ✓5-source legacy URL inventory & permanent 301 redirect rulebook
- ✓Complete 25–60+ route information architecture & corridor blueprint
- ✓Interactive calculator, estimator & Client Operations Portal specification
We Engineer Interactive Tools, Operations Portals & Single-Tenant Databases
We write clean, maintainable React 19 + TypeScript code backed by a dedicated single-tenant PostgreSQL database. Whether your business needs a public sizing calculator, a live regional weather and outage page, or a custom multi-subsystem operations portal, we engineer it from the ground up.
- ✓Custom interactive calculators, estimators & multi-step RFQ workflows
- ✓Dedicated single-tenant PostgreSQL database with strict Row-Level Security (RLS)
- ✓Integrated backend portal suite (Client Portal, Visual Pin Board & Leads CRM)
Built so Google, ChatGPT, Perplexity & Human Buyers Read Complete Pages
Standard single-page React apps ship an empty <div id="root"></div> HTML shell that crawlers cannot index. Our build pipeline prerenders every public route into complete HTML at build time with unified Schema.org @graph blocks and /llms-full.txt manifests.
- ✓Build-time HTML prerendering across all public routes + automated sitemap.xml
- ✓Unified Schema.org JSON-LD @graph (Organization, Service, FAQPage, TechArticle)
- ✓Machine-readable /llms.txt, /llms-full.txt & /specs.json discovery files
Always Running Around the Clock—Checked Every 60 Seconds
We execute a zero-downtime DNS cutover across our NS20/NS30/NS40 BIND nameservers, configure your @yourdomain.com SmarterMail Enterprise email (1 user account included with hosting; additional accounts $6–$18/mo) and SPF/DKIM/DMARC records, and check your live application every 60 seconds via LogBot.app and DNSBot.app.
- ✓Zero-404 domain cutover verified against Google Search Console & Bing
- ✓Always-on 24/7 hosting ($99–$199/mo flat) checked every 60 seconds
- ✓Authenticated @yourdomain.com business & transactional email delivery
Examples of Custom Portals, Calculators & SaaS Engines We’ve Built
When we say “websites engineered as applications,” here is what that actually looks like across our live client and internal platforms.
Outgrown a 10- or 15-Year-Old Small Business Website on Legacy Hosting?
While our 25–60+ route Custom Web Applications ($5K–$15K+) serve companies needing custom configurators and full portals Day 1, established small businesses replacing an outdated site can start with our done-for-you starter build on Core Cloud—with paid add-on modules and a step-up option to Core Cloud + Management as it pays for itself over time.
Did You Already Build the First 80% in an AI Tool? We Can Engineer and Host the Rest.
If you already translated your domain knowledge into working screens on an AI builder platform and hit the 200-prompt regression wall—or want to escape hourly sandbox hosting bills and lock down VITE_ secrets and PostgreSQL RLS—read our two dedicated engineering guides:
Frequently Asked Questions About Custom Web Applications
How do you price custom web application builds—hourly or flat-fee?
While our published ad-hoc engineering rate is $350/hr, we never bill initial website or web application builds by an open-ended hourly clock. Every custom build is quoted as a predictable flat project fee (typically $5,000 to $15,000 depending on route depth, interactive calculators, and portal modules—explained in detail at /why-we-charge-350-an-hour) so you know the exact cost before we write a line of code.
If it’s a custom React & TypeScript application, how do simple photo swaps or text edits work after launch?
You never get nickeled-and-dimed for routine updates. On our Core Cloud + Management plan (which includes 1 full hour per month per site for review, photo swaps, and updates), you can click any element on your live site using our built-in Visual Pin Board (/visual-pin-board) or email us directly in Southbury, CT—and we deploy the update same-business-day or next-business-day.
How does code and database ownership work?
We follow our transparent Layer A / Layer B Ownership Standard (detailed at /platform-modules): you own 100% of Layer A—your custom frontend application code, pages, calculators, photography, domain registrar settings, and single-tenant PostgreSQL database records—from day one with unrestricted Git and pg_dump exports. Layer B (our reusable backend suite: Client Operations Portal, Visual Pin Board, and Leads CRM) is included with custom builds and our $199/mo Core Cloud + Management plan at no extra software license fee while hosted with GreenTree. Layer B stays with GreenTree if you move; your Layer A exports in full.
What if I already started building a prototype on Lovable, Famous.ai, Bolt, or Replit?
We also work with founders and domain experts who built the first 80% of an application in an AI tool and need an experienced engineering partner to finish the rest—refactoring the codebase, isolating VITE_ secret keys, locking down PostgreSQL Row-Level Security, prerendering routes for Google/AI search, and moving onto flat-rate persistent cloud hosting. Read our dedicated guide at /library/from-ai-prototype-to-production-web-application.