HubSpot CustomDevelopment.
Beyond the marketplace. We build custom HubSpot solutions for teams whose needs don't fit a one-size-fits-all app.
Dunamis Studios is a software studio with a HubSpot specialty. This page covers our HubSpot work — UI extensions, API integrations, data pipelines, AI workflows, and portal recovery. Looking for custom application development outside the HubSpot ecosystem? See Build Services.
What We Build
Custom HubSpot Apps and UI Extensions
React-based UI extensions for CRM cards, App Home, and Settings surfaces. Built on the latest HubSpot Platform version.
API Integrations and Bidirectional Syncs
Connect HubSpot to the systems your business actually runs on. Real-time syncs, custom field mappings, and rate-limit-safe pipelines.
Data Pipelines and Migration Tooling
Multi-object deduplication, large-scale imports, and custom ETL work. We've built systems that handle 500K+ records.
AI-Powered HubSpot Workflows
Anthropic Claude integrations for structured data generation, conversational outputs, and intelligent automation inside HubSpot.
Audits, Architecture, and Recovery
Portal audits, data architecture reviews, and recovery from compromised or corrupted environments.
Who We Work With
We're a Fit For
- Solutions Partners needing overflow technical capacity
- HubSpot customers who've outgrown admin-level configuration
- Teams building custom CRM workflows that require code
- Companies with complex data, integration, or AI needs in HubSpot
We're Not a Fit For
- Basic portal setup or onboarding
- Email and landing page template work
- Marketing strategy or campaign execution
- Generic admin or no-code automation work
Recent Work
Real Estate Investment CRM
Built a fully custom HubSpot CRM managing 450K+ contacts, 400K+ properties, and 500K+ phone records across a property-centric architecture. Includes a multi-object deduplication pipeline that consolidated 55K+ records and a bidirectional sync with CallTools handling 40+ mapped fields.
Direct Mail Automation System
React UI extension with a mailer sequencing algorithm and Postalytics integration, supporting both one-time and drip campaign paths inside HubSpot.
Portal Compromise Recovery
Led full recovery from a portal security incident involving corrupted contact-property associations across thousands of records. Rebuilt all affected workflows, re-imported source data from verified exports, and contributed artifacts to HubSpot's internal security review.
Debrief
AI-powered handoff intelligence app that generates handoff briefs and conversational messages when CRM record ownership transfers.
Property Pulse
Property change history tracking on every record, with audit trail and source attribution.
How It Works
Reach out with a problem
You reach out with a problem, not a spec. We figure out the spec together.
Scope and quote
We scope the work and quote a fixed price or hourly rate depending on what fits.
Build, ship, iterate
We build, ship, and iterate on real feedback. No mock data, no theoretical solutions.
You own the result
You own the result. Source code, documentation, and ongoing access.
Answers to the questions we actually get.
What kinds of custom HubSpot work do you take on?
Custom HubSpot apps and UI extensions (React extensions for CRM cards, App Home, and Settings surfaces), API integrations and bidirectional syncs, data pipelines and migration tooling (multi-object dedup, large imports, custom ETL), AI-powered HubSpot workflows (Anthropic Claude integrations), and portal audits, architecture reviews, and recovery from compromised or corrupted environments.
Who is a good fit for custom engagements?
Solutions Partners needing overflow technical capacity, HubSpot customers who have outgrown admin-level configuration, teams building CRM workflows that require code, and companies with complex data, integration, or AI needs in HubSpot. We are not a fit for basic portal setup, email and landing page template work, marketing strategy, or generic admin or no-code automation.
How does an engagement get scoped and priced?
You reach out with a problem, not a spec. We figure out the spec together, then quote a fixed price or hourly rate depending on what fits. We build, ship, and iterate on real feedback (not mock data, not theoretical solutions). You own the result: source code, documentation, and ongoing access.
Can you share examples of past engagements?
A real-estate investment CRM managing 450K+ contacts, 400K+ properties, and 500K+ phone records, including a multi-object dedup pipeline that consolidated 55K+ records and a bidirectional CallTools sync with 40+ mapped fields. A direct-mail automation system with a sequencing algorithm and Postalytics integration. A portal compromise recovery that rebuilt corrupted contact-property associations across thousands of records and contributed artifacts to HubSpot's internal security review. Plus our two marketplace products, Debrief and Property Pulse.
Let's Talk
Tell us what you're working on. We'll respond within two business days with whether it's something we can help with and a rough sense of scope.