Neighborshare
Sandbrook Share — a neighborhood marketplace built by one person.
Sandbrook Share is a neighbor-to-neighbor marketplace for borrowing tools, renting golf carts, and booking local services. Full product — strategy, design, engineering, QA — shipped by one strategist with an autonomous agent fleet. An agency quoted $80-150K. We did it for a fraction.
100+
Tickets shipped
< 24h
Average cycle time
13
Database tables, row-level security
1
Strategist. Zero juniors.
The problem
Building a marketplace means building trust. You need auth, payments, messaging, reviews, and listings — all feeling polished from day one. Agencies quote $80-150K and take 6 months. Freelancers cut scope. Neither option works for a community product that needs to feel complete to get its first user.
Context
Sandbrook Ranch is a 2,000+ home community in Anna, TX. Neighbors were already sharing informally — tools, golf carts, services — but there was no platform for it. The vision: a white-label sharing marketplace that could start with one community and expand to any neighborhood.
The challenge
A marketplace has to feel complete on day one or nobody trusts it.
You need authentication, real-time messaging, secure payments, reviews, search, responsive design, and a trust framework — all before a single user signs up. An agency quoted $80-150K over 4-6 months. A freelancer estimated 3-6 months with features cut. The budget and timeline didn't support either path.
What we found
Speed kills quality when QA is deferred. The fastest path to a real product isn't skipping steps — it's automating them. Continuous integration with visual QA at three viewports, row-level security from the schema up, and architecture designed for multi-tenant from day one. Build it right the first time because there's no time to rebuild.
Our approach
Started with a complete product bible: business model, unit economics, trust and safety framework, and 5 detailed user personas covering borrowers, lenders, and service providers.
Designed a multi-tenant white-label architecture. 13-table Supabase schema with row-level security, real-time subscriptions on messaging, and Google OAuth. Built to deploy to any community with a config change.
Spec'd 100+ tickets with exact acceptance criteria and verifiable done-when commands. An autonomous agent fleet executed continuously — frontend, backend, QA, DevOps all running in parallel.
Full CI/CD pipeline with pre-push hooks, visual QA at 375/768/1280 viewports, WCAG AA compliance checks, and 24/7 monitoring. Nothing ships without passing the gate.
The product
How it works — three-step flow from browsing to sharing
Mobile responsive — designed for the neighborhood, not the desktop
Before & after
Product
Vision in founder's head
Complete marketplace — live, deployed, real users
Codebase
Nothing
7 routes, 13-table schema, real-time messaging
Architecture
N/A
Multi-tenant white-label — deploy to any community
QA
N/A
Automated visual QA + WCAG AA at 3 viewports
Cost
$80K–$150K (agency quote)
Fraction of agency cost
Results
What changed.
Complete marketplace live — auth, messaging, listings, search, payments, reviews, trust framework. One strategist, zero junior designers, zero agency overhead.
100+ tickets shipped with sub-24-hour average cycle time from spec to production deploy.
White-label architecture ready for the next community. Expanding beyond Sandbrook Ranch is a config change, not a rebuild.
Proof
sandbrockshare.com is live — go browse it.
Green build pipeline with merge gates. Every deploy verified at 3 viewports before production.
Similar challenge?
Technical Spike
$2,000One-week deep-dive into your product idea: architecture recommendation, schema design, risk map, and a realistic build estimate.
Product Build
$5K–$20KStrategy, architecture, full-stack development, QA, and production deployment. Your product, live.
Engineering Retainer
$3K–$10K/moFeature development, infrastructure, monitoring, incident response, and platform compounding.
Sandbrook Share is a SuperIC property. Timelines and scope reflect this specific engagement.