Custom Development & Systems Integration Services for APIs, Integrations, and Business Applications
Most of your business runs on standard platforms. ERP, CRM, HR, ITSM, productivity tools. They work. But there’s always a gap. The legacy system that runs a core piece of operations and nothing modern can talk to. The integration between two platforms that should exist but doesn’t. The custom report the vendor said you can build yourself that’s been on the to-do list for two years. The industry-specific software nobody else has integrated with. The workflow that doesn’t fit any standard platform. The gap is real, off-the-shelf vendors can’t or won’t fill it, and your internal IT team doesn’t have the capacity to build it themselves.
Kelley Create’s Custom Development & Systems Integration services build the connectors, applications, integrations, reports, workflows, and tooling that off-the-shelf platforms can’t deliver.
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what worked then may not work now
The Legacy System Isn’t Going Anywhere. The Workaround Has.
The legacy system isn’t going anywhere. The workaround has. Critical business logic lives in a custom application built years ago by someone who no longer works there. Vendors won’t quote on integration because they don’t understand the codebase. The middleware that connects the legacy system to the modern stack broke last quarter and the workaround the team built isn’t holding. Every new feature request becomes an estimate scoping exercise nobody wins.
The right partner doesn’t sell you a rewrite you can’t afford. We design integration and modernization in phases, keeping what works and replacing what doesn’t, on a path that fits the actual business. That’s us.
What Are Custom Development & Systems Integration?
Custom Development is the work of building software that off-the-shelf platforms can’t deliver: business applications that fit your specific workflows, custom reports that pull from sources standard reporting can’t reach, Power Platform extensions to Dynamics or Microsoft 365, custom Copilot agents, data migration tooling, and the long tail of specialized capability that platforms don’t include.
Systems Integration is the work of making your platforms talk to each other and to the rest of your technology landscape: APIs and middleware connecting CRM to ERP to HRIS to industry-specific systems. Real-time data flow between systems that should share context. The integration work that turns a stack of disconnected platforms into a connected business platform. We do both, often together, often as part of broader engagements with our other services.
Engagements Range From Focused Two-Week Sprints Through Multi-Month Application Development. Right-Sized Scoping That Fits the Actual Problem.
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How Kelley Create Delivers Custom Development & Systems Integration
Four phases. Discovery and scoping, design, build, then ongoing support.
Requirements analysis. Current state assessment. Technical feasibility. Right-sized scoping. We’re honest about what’s worth building, what should be bought instead, and where the right answer is less than what you walked in asking for.
Technical architecture. Integration patterns. Data model. Security model. Testing strategy. The design work that prevents the rebuild-after-launch failure mode.
Iterative development with regular checkpoints. Source control. Code review. Testing as we go, not just at the end. Documentation that future developers (yours or ours) can actually use.
Ongoing maintenance, monitoring, and enhancement. Platform updates as the underlying systems change. The work that keeps custom development from becoming next year’s legacy problem.
What’s Included: Capabilities
Custom development engagements span a wide range of capabilities. The components below are typical.
One partner. One development methodology. One bridge between what your platforms do and what your business needs.
these components are typical
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RESTful APIs, message queues, integration buses. The infrastructure that lets systems talk to each other.
Local Copilot Expertise, National Reach
Custom development requires close collaboration with the business. The discovery, scoping, and validation work happens hands-on.
Local. Regional development specialists for on-site discovery, scoping, and validation milestones.
National. Distributed development teams. Multi-location organizations get coordinated development across sites with consistent architecture and standards.
Why Partners Choose Kelley Create for Custom Development
Senior developers and integration architects with deep expertise.
Not junior offshore resources working from a spec. People who’ve integrated legacy systems most consultants won’t touch and shipped code that’s still in production years later. The architect scoping your project is the architect building it.
Right-sized scoping.
Two-week sprints for focused work. Multi-month engagements for substantial applications. Honest scope, honest timeline, honest pricing. No billable-hours optimization.
Microsoft ecosystem expertise.
Dynamics 365, Power Platform, Microsoft 365, Azure, Copilot Studio. Deep platform expertise on the most common modern business platform.
Legacy integration capability.
Old SQL Server databases, Windows Forms applications, proprietary databases, mainframe systems. The integration work that consultants who only know modern stuff can’t deliver.
Honest about build-vs-buy.
Sometimes the right answer is buying. We tell you when that’s the case and don’t sell custom development to fix problems off-the-shelf would solve.
Integration with the rest of the stack.
Custom development pairs with our automation, enterprise application, and Copilot services. The work fits into a broader coherent strategy.
Code that future developers can maintain.
Documentation, source control, testing, code review built in. Custom work that doesn’t become next year’s legacy problem.
Who Custom Development & Systems Integration Is For
Organizations with legacy systems running mission-critical operations on platforms with no modern integration story.
Companies with integration gaps between modern platforms where standard connectors don’t cover the specific need.
Internal IT teams needing development capacity for specific projects without long-term FTE hires.
Businesses with industry-specific workflows that don’t fit standard platforms and require platform extension or custom applications.
Power Platform and Copilot Studio users needing pro-developer support to extend citizen-developer work into production-grade applications.
Mid-market manufacturers, healthcare practices, and distributors with the long-tail of business-specific systems that need integration with modern platforms.
Case Studies: AI & Intelligent Solutions
Real businesses. Real Outcomes. Click to view all Case Studies.
Find Out Whether Custom Development is Actually the Right Answer for Your Specific Gap. Free Assessment With Honest Scoping.
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Ready to Bridge the Gap Between Your Platforms?
the engineering lead’s eleven-month integration problem isn’t a the engineering lead problem. It’s a gap between what modern platforms deliver out of the box and what businesses need. Standard tools cover most needs but leave specific gaps. The fix isn’t more meetings with platform vendors who won’t or can’t fill the gap. It’s custom development scoped honestly, designed properly, and built by a team that knows both modern and legacy systems.
Free custom development assessment. We map your specific gap, validate technical feasibility, and produce honest scoping with realistic timelines. We tell you when the right answer is custom and when it isn’t.
Frequently Asked Questions
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How do we know if custom development is the right answer?
Assessment first. If standard platforms cover the need with configuration, custom development usually isn’t justified. If the gap is specific, the workaround cost is high, and the value justifies both build and ongoing maintenance, custom development is the right answer. We’re honest in scoping when off-the-shelf would solve the problem.
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What technologies do you work with?
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How long do projects take?
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How does pricing work?
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What about Power Platform vs full custom development?
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Can you work with our existing development team?
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What about ongoing support after the build?
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What if requirements change during development?
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Can you migrate data from our legacy system?
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What about Copilot Studio agents?
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How do you handle security?
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What if our internal IT team needs training?