Custom Software Development Agency
We build software that fits your business, not the other way around. For 20 years, Coalesce has helped companies ship products that off-the-shelf tools can't handle.
Since 2006
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$125M+ client revenue supported
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4+ year avg. client relationship
Whether you're building from scratch or extending what you have, we bring senior engineers and strategic thinking to every engagement. We turn competitive advantages into custom platforms, connect systems that don't talk to each other, and ship products that actually fit how your business works.
When off-the-shelf stops working
You've probably tried the obvious solutions. Salesforce plugins, Zapier workflows, that SaaS tool your competitor swears by. At some point, duct tape and workarounds stop scaling. You need something built around how your business actually works.
Your workflow is the product.
The thing that makes your business different can't be bought off the shelf. Whether it's how you onboard customers, process transactions, or connect data across systems, your competitive advantage needs custom software behind it.
You've outgrown the tools you started with.
What worked at 10 employees or 1,000 users is now a bottleneck. You need something that scales with the business, not something you'll have to rip out in two years.
You need systems that actually talk to each other.
Your CRM doesn't know what your billing system knows. Your ops team is copy-pasting between three dashboards. Custom software connects the pieces: APIs, integrations, and data flows built for your stack.
Services
Legacy Modernization
Upgrade aging systems without rebuilding from scratch
API Development & Integrations
Connect your tools and automate manual workflows
AI Implementation
Add intelligence layers to existing products
Custom Web Applications
Platforms built around your unique business logic
Mobile Development
iOS and Android apps that scale with your users
Ongoing Support & Maintenance
Security, performance, and continuous iteration
Process
1. Discovery
We start by understanding your business: goals, constraints, existing systems (if any), and what success looks like. No 200-page audits.
2. Strategy
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.
3. Build
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.
4. Launch
QA, deployment, and monitoring. We don't ship and disappear.
5. Iterate
Ongoing partnership, not a handoff. We stick around to make it better.
Recent Case Studies
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 industries do you work with?
We've built custom software for Education, Financial Services, Online Publishing, Real Estate, Health Care, Non-Profit, Hospitality, Manufacturing, Entertainment, Internet, Fashion, and Consumer Goods—among others.
How long does a typical project take?
It depends on scope. A focused MVP or integration project might take 6–10 weeks. Larger platform builds typically run 4–8 months. We'll give you a realistic timeline after discovery.
Do you work with existing codebases?
Yes—it's our specialty. We call it brownfield development. We assess what you have, identify what's worth keeping, and build from there.
Where is your team located?
We're headquartered in New York City, with senior engineers across the Americas and Europe. Our distributed team means faster turnaround without sacrificing quality or communication.
How do you price projects?
Most engagements start with a focused discovery phase, then move into monthly retainers for ongoing development and support. We scope work as fixed-fee or monthly retainers depending on the nature of the project. Full builds vary based on complexity. We're not optimizing for one-off projects. We partner with teams who want a long-term engineering relationship.
What's your approach to AI in development?
We use AI to accelerate development—but every decision goes through human review. AI handles the first draft; our senior engineers handle judgment, architecture, and quality.
Ready to build something that lasts?
We support $125M+ of client revenue annually with a lean team of senior engineers. Let's talk about what you're building.