Web Application Development Services
Complex web applications built to last. For 20 years, Coalesce has helped companies build secure, scalable web platforms that handle real business complexity without falling apart.
Since 2006
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$125M+ client revenue supported
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4+ year avg. client relationship
Your web application isn't a marketing site. It's the product. Whether you're building a customer portal, internal tool, marketplace, or SaaS platform, you need engineers who understand that web apps are software first, and they need to be built like it.
When your web app is the business
Most agencies build websites. We build web applications. There's a difference. Websites are brochures. Web apps have users, data, business logic, integrations, and edge cases that can break everything. We've been building them since 2006.
Your requirements are more complex than a template can handle.
Real business logic doesn't fit in a page builder. Role-based permissions, multi-tenant architecture, complex workflows, reporting dashboards. These require custom engineering, not configuration.
You need it to scale without a rewrite.
The decisions you make at 100 users determine what happens at 10,000. We architect for growth from day one, so you're not rebuilding when traction hits.
Your team will need to maintain this.
We write code that your future developers can actually understand and extend. Clean architecture, comprehensive documentation, and patterns that make sense.
Services
Full-Stack Development
End-to-end web application development using modern frameworks and best practices for performance, security, and maintainability.
Database Architecture
Schema design, query optimization, and data modeling that scales with your business and keeps your application fast.
API Development
RESTful and GraphQL APIs that power your application and integrate cleanly with third-party services and mobile clients.
Authentication & Authorization
Secure user management, role-based access control, SSO integration, and compliance with security best practices.
Admin & Back-Office Tools
Internal dashboards, content management, reporting systems, and operational tools that make your team more efficient.
Performance Optimization
Load testing, caching strategies, and infrastructure tuning to ensure your application stays fast under real-world conditions.
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 technologies do you use for web applications?
We're pragmatic about technology choices. Most of our web apps use React or Vue on the frontend, with Node.js, Python, or PHP on the backend depending on the use case. We choose based on your requirements, not our preferences.
How long does it take to build a web application?
It depends on complexity. A focused MVP might take 2-3 months. A full-featured platform with integrations and admin tools typically runs 4-8 months. We'll give you a realistic timeline after discovery.
Do you work with existing codebases?
Yes. We specialize in brownfield development. Whether you need to extend an existing application, fix technical debt, or modernize aging systems, we're comfortable inheriting code.
How do you handle hosting and infrastructure?
We deploy to modern cloud infrastructure, typically AWS, and set up CI/CD pipelines, monitoring, and security best practices. We can manage infrastructure long-term or hand it off to your team.
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 web application projects?
Most projects start with a discovery phase to define scope, then move into fixed-fee builds or monthly retainers for ongoing development. We're not optimizing for one-off projects. We partner with teams who want a long-term engineering relationship.
Ready to build a web application that lasts?
We support $125M+ of client revenue annually with a lean team of senior engineers. Let's talk about what you're building.