Project Proposal · June 2026

Construction
Marketplace Platform

The smarter way to build and renovate — connecting homeowners with verified construction teams through transparent, escrow-protected bidding.

3 moto MVP
5–6developers
$60KPhase 1
iOS · Android · Web+ Admin
The Problem

Hiring a contractor is a leap of faith

Homeowners spend big money with little protection and no way to compare fairly.

  • Opaque pricing — quotes for the same job vary 2–3×, with no benchmark
  • Unverified contractors — no easy way to confirm licenses or past work
  • Fragmented process — calls, texts, and paper quotes, no single system
  • Payment risk — deposits paid upfront with no recourse if work goes wrong
⚠️

The cost of doing nothing

Disputes, fraud, and abandoned projects erode trust on both sides — homeowners overpay and quality teams lose work to whoever bids loudest.

The Solution

One platform that fixes every pain point

A trusted marketplace with operator oversight built into every step.

🛡️

Verified Professionals

Every team operator-approved before they can bid.

📸

Visual Documentation

Photo & video submissions so bids match the real job.

⚖️

Competitive Bidding

Compare validated quotes side-by-side.

🔒

Escrow Payments

Funds released only when work is delivered.

Quality Assurance

Reviews & ratings keep teams accountable.

🤖

AI Pricing Phase 2

ML estimates to benchmark every quote.

How It Works

From photo to signed contract in 5 steps

The operator validates every bid before the homeowner ever sees it.

01

Project Created

Homeowner uploads photos & video of the job

02

Teams Notified

Matching verified teams get alerted

03

Bids Submitted

Teams send offers with price & timeline

04

Operator Validates

Admin approves before bids go live

05

Contract Signed

Homeowner accepts, escrow funded

01
The Product

Three sides, one marketplace

Purpose-built features for homeowners, construction teams, and operators.

🏠
For Homeowners

Get the right team, at a fair price

📱Easy Project Creation

Upload images & videos of repair needs with detailed descriptions.

💰Bid Comparison

View and compare multiple validated bids side-by-side.

Verified Teams

Browse profiles of operator-approved construction professionals.

💬Direct Messaging

Communicate with teams throughout the project.

🔒Secure Payment

Escrow-protected payments for peace of mind.

Reviews & Ratings

Rate and review completed projects.

👷
For Construction Teams

Win more work, get paid reliably

🏗️Professional Profile

Showcase credentials, portfolio, and specializations.

🎯Project Discovery

Find relevant projects matching your expertise.

📝Bid Submission

Submit detailed proposals with pricing and timeline.

💼Job Management

Track active projects and client communications.

💳Deposit System

Secure deposit management before accepting jobs.

💵Payout Processing

Receive payments upon job completion.

🎛️
For Operators

Quality control at the center

Team Approval

Review and approve construction team registrations.

🔍Bid Validation

Verify bids before showing them to homeowners.

⚖️Dispute Resolution

Manage conflicts and resolve issues fairly.

📊Analytics & Reporting

Monitor platform metrics and performance.

👥User Management

Oversee users and teams on the platform.

🎚️Platform Monitoring

Real-time system health and alerts.

02
The Build Plan

Technology, timeline & team

A lean team shipping a production MVP in three months.

Technology

Modern, scalable, cloud-native

Mobile

React Native 0.73+

Web

React 18+

Backend

Node.js 20 LTS · TypeScript

Data

PostgreSQL 15 · Redis

Cloud

AWS — ECS, RDS, S3

Queue

Kafka / SQS

Architecture at a glance

4 client apps · 9 backend microservices · PostgreSQL + Redis data layer · 5 external integrations (Stripe, push, media, maps, email).

9
Microservices
4
Client Apps
Delivery Plan

3-month core build, testing buffer to launch

Wk 1–2
Sprint 0 — FoundationAWS, CI/CD, architecture, onboarding
Wk 3–6
Core BackendAuth, users, teams, API gateway
Wk 7–10
Bidding SystemProjects, bids, media, notifications
Wk 11–14
PaymentsStripe, escrow, deposits, payouts
Wk 3–14
Frontend (parallel)Mobile, web, admin dashboard
Wk 15–18
Test & LaunchE2E, security audit, UAT, app stores
Phase 1 · 6 Sprints + Launch Buffer

Sprint-by-sprint breakdown

Sprint 0 · Wk 1–2

Foundation

AWS setup, repository config, CI/CD pipelines, architecture design, team onboarding.

Sprints 1–2 · Wk 3–6

Core Backend

Authentication, user management, team service, database, API gateway.

Sprints 3–4 · Wk 7–10

Bidding System

Project service, bidding logic, media processing, message queue, notifications.

Sprints 5–6 · Wk 11–14

Payments

Stripe integration, escrow, deposits, payouts, transaction management.

Parallel · Wk 3–14

Frontend

Mobile apps (React Native), web application, admin dashboard — built alongside backend.

Wk 15–18

Test & Launch

Integration & E2E tests, performance, security audit, UAT, app store submission.

Phase 2 · Months 4–6

AI-powered pricing

Turn historical project data into instant, defensible price estimates.

  • Computer vision — assess damage from images & video
  • Price prediction — ML model trained on historical bids
  • Confidence scoring — reliability range on every estimate
  • Continuous learning — automated retraining pipeline
80%
within ±15%
<2s
inference

Platform

AWS SageMaker · +1 ML Engineer · +1 Data Engineer

Team & Investment

Lean team, clear cost

Core Team · 5–6 people
  • 1 Product Owner / Scrum Master — vision, backlog, ceremonies
  • 2 Backend Developers — APIs, database, integrations
  • 2 Frontend Developers — React, React Native, UI/UX
  • 1 DevOps / QA Engineer — AWS, CI/CD, testing, security

Phase 2 adds +1 ML Engineer, +1 Data Engineer

Trust & Compliance

Secure by design

Security Measures

  • TLS 1.3 in transit · encryption at rest
  • JWT auth · role-based access control
  • Rate limiting & DDoS protection
  • SQL injection · XSS · CSRF prevention
  • AWS WAF & GuardDuty

Compliance Targets

  • PCI DSS — payment data compliance
  • OWASP Top 10 — vulnerability prevention
  • SOC 2 — data security standards

Escrow ensures funds are never at risk during a dispute.

What Success Looks Like

Measurable from day one

100+
users · month 1
50+
verified teams
20+
projects done
4.0+
avg rating

Delivery targets: on-time launch · budget variance <10% · zero critical vulnerabilities · user satisfaction ≥4/5.

Next Step

Sign off this week,
build starts Monday.

✅ Approve

Proposal, scope & contract type

💰 Confirm

Budget & team availability

✍️ Sign

Contract & SOW — kick off Sprint 0

Ready to build the future of construction?

3-month MVP · fixed scope · clear milestones — let's build it.

CEOtuan.anh@just.engineer
CTOthang.lam@just.engineer
Construction Marketplace Platform · Project Proposal
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