Software Development for Real Estate and PropTech MLS, IDX & Property Mgmt
MLS integration via RESO Web API, IDX listings, property and tenant management, transaction platforms, valuation tools, and tenant portals. RESO Data Dictionary compliant. Shipped in 8 to 20 weeks. USD pricing.
We tell you whether your build needs MLS integration, what RESO certifications are required, and how data licensing affects your stack.
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Who we've built for.
How we work in PropTech
- What we build
- MLS integration · IDX · Property mgmt · Tenant portals · Transaction · Valuation · Smart building · Construction tech
- Stack
- Next.js · Node.js · Python · PostgreSQL · PostGIS · AWS · RESO Web API · Mapbox · Algolia
- Compliance
- RESO Data Dictionary · RESO Web API · Fair Housing Act · CCPA · GDPR · SOC 2 Type II · PCI DSS
- Integrations
- MLS Grid · Bridge Interactive · Trestle · Stripe · DocuSign · Plaid · Salesforce · HubSpot · QuickBooks
- Pricing in USD
- Starter build from $10,000 · MLS-integrated platform from $17,000 · Property management platform from $42,000
- Output
- Production platform · MLS integration · RESO conformance · runbook · on-call coverage
PropTech software is where data licensing, geographic data, and transaction complexity collide. MLS data is licensed per market with per-market rules. Property data flows from county records, satellite imagery, and listing portals with varying quality. Transaction software touches title, escrow, and lender systems that move slowly. This page covers what makes PropTech builds different, the segments we serve, what RESO compliance actually means, the named clients we have shipped for, and what every category typically costs.
Named PropTech builds
Recent PropTech and real-estate builds.
Lifestyle-and-living adjacent commerce platform with property and household catalog modeling.
Read case study →Property-adjacent energy production platform with site-level monitoring.
Read case study →Regulated workflow platform with partner-network and territory-management workflows applicable to PropTech.
Read case study →PropTech segments we serve
MLS integration and IDX
RESO Web API integration with MLS Grid, Bridge Interactive, Trestle, or direct MLS. IDX listing pages with SEO. VOW workflows. RESO Data Dictionary compliant.
Property and rental management
Listing management, tenant onboarding, lease, rent collection, maintenance request workflow, vendor management, accounting integration.
Tenant and resident portals
Rent payment, maintenance requests, document repository, community announcements, package tracking, smart lock integration.
Real-estate transaction platforms
Offer and counter-offer workflow, e-signature, document collection, title and escrow integration, closing checklist, commission disbursement.
Valuation and AVM
Automated valuation models trained on transaction history, comparable selection, market-trend analytics, integration with county assessor data.
CRE and commercial real estate
Multi-tenant lease management, CAM reconciliation, building operations, portfolio reporting, investor reporting.
Smart building and IoT
Access control, HVAC, energy monitoring, occupancy analytics. Integration with Building Management Systems (BMS) and IoT sensor networks.
Construction tech and pre-development
Project management, plan markup, RFI workflow, submittals, punch-list tracking. Integration with Procore, Bluebeam, AutoCAD.
Related services: Custom Software Development, Web Development, Mobile App Development, AI & Machine Learning, API Integration, Automation Platforms, Cloud & DevOps, Data Pipeline Engineering.
Use cases — concrete examples with cost ranges
IDX listing site with MLS integration
RESO Web API integration via MLS Grid or Bridge Interactive. Listing pages with SEO (LocalBusiness and Residence schema). Saved search and alert workflow. Agent and brokerage subdomain support. Stack: Next.js plus Node.js plus PostGIS plus Algolia. Typical build 10 to 14 weeks. From $15,000 depending on MLS count and search sophistication.
Property management platform
Tenant onboarding with screening (TransUnion SmartMove, RentPrep, MyRental), lease management with e-sign, rent collection via ACH or card with auto-pay, maintenance request workflow with vendor dispatch, accounting integration with QuickBooks or Yardi. Stack: Next.js plus Node.js plus PostgreSQL plus Stripe plus DocuSign. Typical build 14 to 20 weeks. From $25,000 depending on unit count tier and accounting integration depth.
Real-estate transaction platform
Offer and counter-offer workflow, e-signature via DocuSign, document collection, title and escrow integration (Qualia, Endpoint, Spruce), closing checklist with task assignment, commission split and disbursement. Stack: Next.js plus Node.js plus PostgreSQL plus DocuSign plus Qualia. Typical build 12 to 18 weeks. From $20,000 depending on title and escrow integration count and brokerage-side workflow complexity.
AVM and valuation platform
Transaction-history ingestion. Comparable selection algorithm. AVM model trained on historical sales. Market-trend analytics. Integration with county assessor and parcel data. Stack: Python ML plus PostgreSQL plus PostGIS plus React UI. Typical build 14 to 20 weeks. From $20,000 depending on geographic coverage and model sophistication.
Why PropTech software is different
PropTech builds carry three costs that a standard SaaS does not. First, MLS data licensing and access: each MLS has its own data agreement, certification process, and update cadence. The RESO Web API and Data Dictionary standardise interfaces, but per-MLS licensing is still bespoke. Second, geographic data complexity: PostGIS, polygon search, address normalisation, and parcel data require dedicated engineering. Third, transaction system integration: title, escrow, lender, and county recorder integrations are slow, fragmented, and often paper-based. Estimating these correctly is the difference between an on-schedule build and a six-month overrun. We design PropTech builds around three principles. Lead with RESO Data Dictionary and Web API to keep MLS integration costs bounded as you expand markets. Treat geographic data as a first-class concern from architecture day 1, not a bolt-on at search-tuning time. Plan transaction integrations conservatively because partner systems set the pace, not your engineering team.
Implementation roadmap
Five-phase rhythm for PropTech builds. MLS licensing kicked off in week 1.
Discovery and MLS scope (2 weeks)
Target MLS list with licensing approach (direct or wholesaler). RESO compliance scope. Output: MLS data licensing plan plus compliance scope document.
Architecture and geographic-data design (2 weeks)
Spatial query patterns. Listing data model aligned to RESO Data Dictionary. Search and discovery design. Output: ADRs plus data dictionary.
Build (6 to 14 weeks)
Two-week sprints. MLS integration validated against sandbox every sprint. SEO and Web Vitals gate on listing pages.
RESO conformance and pre-launch (2 weeks)
RESO Web API conformance testing. Fair Housing audit on search and AI-generated content. Performance and load testing.
Launch and dual on-call (1 week plus 2 weeks)
Production deploy. MLS data refresh schedule confirmed. Monitoring. On-call rotation. Runbook delivered.
Tech stack and architecture
Default PropTech stack. Each layer chosen for MLS integration, geographic queries, and transaction-workflow flexibility.
- Front end: Next.js with TypeScript. SSR for listing pages (SEO critical). CSR for authenticated tenant and agent surfaces. Map rendering via Mapbox GL, Google Maps Platform, or Leaflet.
- Application layer: Node.js or Python (FastAPI). Stateless services behind API gateway. Idempotent on transaction writes.
- Data layer: PostgreSQL with PostGIS for spatial queries (radius, polygon, ZIP, neighborhood). Algolia or Typesense for fast listing search. S3 for media with CloudFront delivery.
- MLS integration: RESO Web API client. MLS Grid, Bridge Interactive, Trestle as wholesalers for multi-MLS coverage. Per-MLS data licensing managed via lookup table.
- Transaction layer: DocuSign or Dropbox Sign for e-signature. Stripe for rent collection. Plaid for bank verification. NACHA for ACH disbursement.
- AI and analytics layer (when applicable): AVM models. Listing-quality scoring. Photo enhancement. Generative description with brand-voice and Fair Housing guardrails.
- Cloud: AWS by default. Multi-region for nationwide listing serve. CDN for media.
Compliance and audit readiness
Every PropTech build ships with the controls and documentation regulators, MLSs, and audit partners expect. RESO Data Dictionary 1.7 plus RESO Web API for MLS interoperability. Fair Housing Act compliance baked into listing search, AI-generated descriptions, and ad targeting (no protected-class steering). CCPA and CPRA for California residents. GDPR for EU listings or tenants. SOC 2 Type II for SaaS controls. PCI DSS for rent payment via tokenised gateway. ADA and WCAG 2.2 AA accessibility baseline because real-estate web accessibility lawsuits are common since the 2020s.
Cost drivers we see in PropTech builds
PropTech build cost ranges meaningfully. These are the seven drivers we see push or pull on the number.
- MLS count and licensing model. Single MLS via wholesaler is cheap. Multi-MLS with mixed direct and wholesaler relationships adds 20 to 35 percent.
- RESO conformance scope. Read-only is fast. RESO Web API certification including write-back to MLS is a multi-month process.
- Geographic coverage. Single market is fast. National coverage with parcel data, county assessor, and demographic overlays adds 25 to 40 percent.
- Transaction integration depth. Lead capture is cheap. Full transaction (offer through close) with title, escrow, lender, and county recorder is its own engineering programme.
- Rent payment and accounting integration. Basic ACH is straightforward. Multi-currency, multi-state with local-tax, and integration with Yardi, AppFolio, or QuickBooks adds 20 to 35 percent.
- Tenant screening depth. Basic credit pull is fast. Multi-factor screening with TransUnion, employment verification, and AI-assisted decisioning adds 20 to 30 percent.
- Multi-tenant white-label (agent or brokerage subdomain). Single tenant is fast. Multi-tenant with per-brokerage theming and listing scoping adds 25 to 40 percent.
Pricing
PropTech MVP
From $10,000
- Single workflow, one MLS via wholesaler, basic listing search.
- 8 to 12 weeks.
MLS-integrated platform
From $17,000
- Multi-MLS via wholesaler, IDX listing pages with SEO, saved search and alert.
- 10 to 14 weeks.
Property management platform
From $42,000
- Tenant onboarding, lease, rent collection, maintenance, accounting.
- 14 to 20 weeks.
Transaction platform
From $38,000
- Offer workflow, e-sign, title and escrow integration.
- 12 to 18 weeks.
AVM or valuation platform
From $20,000
- Comparable selection, AVM model, market-trend analytics.
- 14 to 20 weeks.
Maintenance retainer
From $3,250 / month
- On-call cover, MLS API change tracking, dependency upgrades, Fair Housing audit. SLA-backed.
PropTech trends shaping 2026 builds
Six PropTech-software shifts shaping 2026 builds.
- AI listing descriptions and photo enhancement. Generative descriptions with Fair Housing guardrails. Photo enhancement and virtual staging. Used with brokerage review, not autonomous.
- RESO Web API replacing RETS. RETS deprecation continuing. New builds default to Web API. Wholesalers (MLS Grid, Bridge Interactive, Trestle) lead on coverage.
- Tenant-experience platforms expanding. Smart lock integration (August, Latch, Yale), package tracking, community features, embedded financial services.
- Buyer-agent commission transparency. NAR settlement effects continuing through 2025 and 2026. Builds adapt to buyer-rep agreement workflows and commission display rules.
- AVM accuracy and data licensing. Public AVM accuracy benchmarks expanding. Builds adopt confidence-interval reporting and source citation rather than point estimates.
- Climate-risk and ESG data overlays. Flood, wildfire, sea-level, energy efficiency, and certification (LEED, ENERGY STAR) overlays adopted in listing search and valuation.
FAQ
Yes. RESO Web API integration via all three wholesalers. Direct MLS integration where wholesaler coverage is insufficient or where licensing terms favour direct. Per-MLS data licensing managed via lookup table.
Yes. RESO Data Dictionary 1.7 baseline. Mapping from MLS-specific fields to standard dictionary handled in the integration layer. RESO Web API conformance testing built into pre-launch validation.
Listing search excludes protected-class steering. AI-generated descriptions audited for protected-class language. Ad targeting respects Meta and Google special-category restrictions for housing.
Yes. Stripe or NACHA ACH for rent collection. Auto-pay setup. Late-fee logic. Reporting to Experian RentBureau or similar for tenant credit-building. PCI scope kept minimal via tokenised gateway.
Yes. TransUnion SmartMove, RentPrep, MyRental for credit, criminal, eviction history. Income verification via Plaid or pay-stub upload. Screening decision logic with adverse-action notice generation.
Yes. Qualia, Endpoint, Spruce, States Title for title and escrow. Stewart, Old Republic, First American where direct integration is supported. County recorder integration via direct API or e-recording vendors (Simplifile, CSC eRecording).
PostgreSQL with PostGIS for spatial queries. Algolia or Typesense for fast listing search. Polygon search, radius search, ZIP and neighborhood filtering, school district and walk score overlays.
Yes. Transaction-history ingestion. Comparable selection algorithm. AVM model trained on historical sales. Confidence-interval reporting. We deploy with model drift monitoring and ongoing recalibration.
Yes. Multi-tenant lease management, CAM reconciliation, building operations, portfolio reporting, investor reporting. Integration with Yardi Voyager, MRI Software, RealPage where required.
Yes. Per-brokerage theming, custom subdomain, listing scoping by brokerage office, agent roster management. Tenant isolation enforced at the data layer.