Custom Web Application Development
Need a web application that does more than a website can? We design and build portals, dashboards, internal tools and SaaS products around the work your users need to get done. We can start with an untested idea, take over an existing codebase or extend a product already in use. Our team works through the product decisions, interface, APIs, data and deployment together.
Companies we've collaborated with
Full-Stack Web Application Development
A custom web app can be a customer portal that shows account information, a dashboard that pulls several data sources into one view, an internal tool that replaces spreadsheet handoffs or a SaaS product you plan to sell. We also build APIs and integrations that connect those interfaces to the systems a business already uses.
Before choosing a framework, we map the users, the decisions they need to make and the information the app must move. Then we work through the difficult parts: permissions, data quality, integrations, responsive interfaces and the operational work required after launch. If one technical question could decide the project, a proof-of-concept sprint can test it first.
BatchGeo shows the scope of work behind a product used by millions. We’ve built and scaled the mapping platform since 2021, including geocoding pipelines, deck.gl visualization, AWS infrastructure and UX. McFarlane Toys Digital’s Collectors Universe is another example: an interactive 3D digital-collectibles platform.
Building for phones instead? See our mobile app development work. For gameplay and interactive entertainment, see game development. This page focuses on the software people use through a browser and the systems behind it.
Takeovers and rescues welcome
An existing application can be worth improving even when its original team has moved on. We start by inspecting the code, deployment process, dependencies and known failures. That gives us a basis for deciding what to repair, what to retain and what would be expensive to replace.
We can take on a stalled release, an integration that keeps failing, a performance problem or a product that needs a new team to maintain it. If the application was started with AI coding tools, our AI code rescue service addresses the extra review needed before anyone relies on the generated code. You get an assessment of the system before we commit to a build plan.
For an older product that needs a new technical foundation, see our application modernization services.
The build ladder
Different projects need different first commitments. We scope the next step around the question you need answered, with the work and deliverables agreed in writing.
Proof of Concept
When the idea depends on an unproven integration, data source or interaction, test that part first. A PoC sprint produces a working demonstration and a written recommendation about the next step.
- Two to four weeks, fixed scope
- Working demo plus written go/no-go
- Runs as a PoC sprint
MVP Build
When the core approach is sound, build a first release around one useful workflow that real users can use, with the hard parts built rather than deferred.
- Six to ten weeks
- Scoped to the smallest thing that tests demand
Production
For an established application: new features, integrations, performance, security, accessibility or upgrades that keep the system maintainable, with support after launch.
- Feature development and integrations
- Performance, security, and platform upgrades
- Takeovers welcome, audit first
Why Choose SLIDEFACTORY for Custom Web Applications
The person using a dashboard sees the interface. The business also depends on data arriving correctly, permissions working, integrations staying connected and the system being supportable when requirements change. We work across those parts of the product with one team.
We’re comfortable joining before the scope is settled or after a product has a history. Tell us what the application needs to do, what exists now and where it’s getting stuck. We’ll help define a practical next step and put it in writing.
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Frequently Asked Questions
What kinds of custom web applications do you build?
Portals, dashboards, internal tools, SaaS products and data-driven applications. We also build the APIs, integrations and administrative tools behind them. If the main experience belongs in the iOS or Android app stores, see our mobile app development service.
What does a custom web application cost?
It depends on the users, workflows, data and integrations the first release needs. We define the scope and provide a written estimate before development begins. When one technical assumption is still unproven, a proof-of-concept sprint can answer it before a larger build.
Can you take over an application another team built?
Yes. We inspect the codebase, dependencies, deployment and problem areas first, then recommend a repair or development plan. For applications started with AI tools, our AI code rescue service includes a focused review of what’s safe to build on.
How do you decide what goes into the first release?
We start with the job the user must be able to complete and the business question the release needs to answer. From there we identify the essential workflows, integrations and operational requirements. A written scope makes clear what ships first and what can follow after real usage.
