SaaS Development Agency
Multi-tenant platforms built for growth. For more than 20 years, Coalesce has helped companies build SaaS products that scale from first customer to thousands without architectural rewrites.
Since 2006
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$320M+ lifetime client revenue powered by our software
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4+ year avg. client relationship
SaaS is a business model and an architecture pattern. Get the architecture wrong and you'll hit walls. Tenant isolation, subscription billing, usage metering, onboarding flows. We've built these systems before and know where the complexity hides.
When you're building software as a service
SaaS products have different requirements than custom software. Multi-tenancy, subscription management, self-service onboarding, usage analytics. These patterns are well-established, but implementing them wrong creates technical debt that's expensive to fix later.
Multi-tenancy is harder than it looks.
How do you isolate customer data? How do you handle custom configurations per tenant? How do you price based on usage? These decisions affect everything downstream. We help you get them right from the start.
Your billing system is part of your product.
Subscription management, usage metering, invoicing, dunning. These aren't afterthoughts. They're core product features that affect customer experience and revenue recognition. We integrate billing that works.
You need to ship features, not infrastructure.
Every hour spent on deployment pipelines, monitoring, and scaling is an hour not spent on product. We set up infrastructure that gets out of your way so you can focus on what makes your product valuable.
Services
Database design, tenant isolation patterns, and configuration management that scales securely from one customer to thousands.
Stripe, Chargebee, or custom billing systems with metering, invoicing, and revenue recognition that actually works.
Sign-up flows, trial experiences, and activation sequences that convert visitors to paying customers without sales intervention.
Internal dashboards for managing tenants, monitoring usage, handling support, and understanding customer behavior.
Public APIs, webhooks, and third-party integrations that let customers connect your product to their existing tools.
CI/CD pipelines, auto-scaling, monitoring, and security best practices so you can ship confidently and sleep at night.
Process
We start by understanding your business: goals, constraints, existing systems (if any), and what success looks like. No 200-page audits.
A prioritized roadmap based on your constraints. What's urgent vs. important. What we can ship in weeks vs. what needs architectural work. Clear trade-offs, not hand-wavy estimates.
AI-augmented development with human review at every decision point. Whether we're starting fresh or working in your existing stack, you get senior engineers. No handoffs.
QA, deployment, and monitoring. We don't ship and disappear.
Ongoing partnership, not a handoff. We stick around to make it better.
Recent Case Studies
SaaS for Election Compliance
Building a scalable platform from scratch for Operative, keeping every election cycle in compliance.
For Operative / Built with Next.js, Supabase, and Vercel
Processed 27M+ transactions
Brand & Product for a Digital Vault
A completely new identity and custom site build for Locket, a platform that helps people document, value, and protect their most meaningful possessions.
For Locket / Built with Vercel and Supabase
$10M+ in Value Stored Within 2 Weeks of Launch
Made by people who care how it turns out.
Behind every brand, product, and line of code we ship is a team you know by name. We use AI where it makes us faster. The judgment, the taste, and the final call stay with people.
Talk to our team
Talk to our team
Coalesce brought a rigorous development approach, meticulous attention to detail, and creative suggestions to the process. The team was clearly invested in the project's success and has become a trusted, valuable collaborator.
Morgan Brown
Inman News
FAQ
What's your experience with SaaS products?
We've built SaaS platforms across industries including real estate, education, financial services, and media. We understand the patterns: multi-tenancy, subscription billing, usage metering, and the operational complexity that comes with them.
How much does it cost to build a SaaS platform?
Multi-tenant SaaS platforms typically start around $150K, with cost driven by the tenancy model, integrations, and how much custom workflow the product carries. Most of our SaaS work is for companies past early traction, so engagements are scoped against real usage and real users rather than a hypothesis. We scope a firm number in discovery.
How do you handle multi-tenant data isolation?
It depends on your requirements. We've implemented shared-database with row-level security, schema-per-tenant, and database-per-tenant patterns. We'll recommend the right approach based on your compliance needs, scale expectations, and budget.
Which billing platforms do you integrate with?
We have deep experience with Stripe and Chargebee, and can integrate with other platforms as needed. We handle subscription management, usage-based billing, invoicing, and dunning flows.
Can you build both the product and the marketing site?
Yes. We build end-to-end: marketing site, application, admin tools, and the infrastructure to run it all. Having one team own the full stack means fewer handoffs and faster iteration.
Where is your team located?
We're headquartered in New York City, with partners in Nashville and South Florida. Working as one small senior team means faster turnaround without sacrificing quality or communication.
Ready to build a SaaS product that scales?
We've powered $320M+ in lifetime client revenue with a lean team of senior engineers. Let's talk about what you're building.