Custom Web Applications Built for US Businesses, Starting at $7,500

A website displays content — pages, images, text, contact forms. A web application processes data, stores user state, and lets users take actions that change what they or others see. If users log in and do things, it's a web app. Booking systems, customer portals, inventory dashboards, SaaS platforms, internal tools — all web applications. They require a backend (database, server logic, APIs) that websites don't need.

FactoryJet builds: customer-facing portals (booking systems, member areas, online configurators), internal business tools (ops dashboards, reporting platforms, approval workflows), SaaS MVPs (subscription-based software for a specific vertical), e-commerce extensions (custom checkout flows, B2B portals, bulk ordering), and AI-powered applications (LLM-integrated tools, RAG systems, smart search).

Our default stack is Next.js (React) on the frontend, with Supabase (PostgreSQL) or Firebase for database and authentication. For complex API-driven apps, we use Laravel (PHP) or Node.js with Express. For payment processing, Stripe. For file storage, Cloudflare R2 or AWS S3. We match the stack to the project — we don't force every app into the same framework.

All FactoryJet web apps are fully mobile-responsive and perform like native apps on mobile browsers — covering most use cases. For true native mobile apps (App Store or Google Play), we build with React Native, sharing logic between web and mobile. Most clients start with a web app, validate with users, and add native mobile only if retention data supports it.

FactoryJet's web application development starts at $7,500 for an MVP. Mid-complexity apps (multi-role portals, booking platforms, dashboards with third-party integrations) run $15,000–$30,000. Full SaaS platforms with subscriptions, multi-tenant architecture, and complex reporting run $30,000–$80,000. US development agencies typically charge $50,000–$200,000+ for these same tiers.

Websites are primarily design + content work. Web applications require backend development — database design, server-side logic, API development, authentication systems, and security architecture. A 5-page website takes 1–2 weeks of engineering; a booking system with user accounts, scheduling logic, calendar sync, and payment processing takes 6–10 weeks. The complexity is in the logic, not the pixels.

Fixed price — always. We define scope in a detailed specification document before development starts. The spec covers every feature, every user role, every integration, and every edge case we can anticipate. The price is based on that spec. If you add features after development starts, we quote them separately before touching them.

Typical ongoing costs: hosting ($20–$200/month depending on traffic), database (Supabase free tier for small apps, more at scale), third-party APIs (Stripe 2.9% + $0.30/transaction, email from $15/month), and maintenance. FactoryJet offers maintenance plans starting at $299/month covering security updates, dependency updates, bug fixes, and minor feature additions.

A focused MVP takes 4–8 weeks. A mid-complexity platform takes 8–16 weeks. Full-scale SaaS platforms take 4–9 months. FactoryJet uses a phased delivery model: you see a working MVP before the full feature set is done, so you can launch sooner and iterate based on real user feedback rather than assumptions.

Discovery maps every user role (who logs in and what they can do), every data model (what gets stored and how it relates), every integration (what third-party systems connect), and every edge case we can anticipate. Discovery typically takes 3–5 days and produces a specification document we both sign off on. This spec is what your fixed price is based on.

Yes — FactoryJet delivers on a sprint cadence (typically 2-week cycles). At the end of each sprint, you get a working staging environment to test. You're not waiting 10 weeks to see something. If something needs to change, we catch it early when it's cheap to fix. You have daily access to a project tracker and a shared Slack channel.

Yes — full handoff includes: complete source code in a private GitHub repository (transferred to your account), database schema documentation, API documentation, deployment runbook, environment variable documentation, and a recorded walkthrough. You own everything. No lock-in to FactoryJet for future development.

Authentication uses industry-standard libraries — Supabase Auth, NextAuth.js, or Auth0 depending on complexity. We never build custom authentication from scratch. Data at rest is encrypted at the database layer. Data in transit uses TLS 1.3. Role-based access control is built at the API layer, not just the frontend.

FactoryJet apps are built to scale. Next.js on Cloudflare Pages handles millions of requests per month at the free tier for static content. Dynamic API routes deploy to serverless functions that auto-scale. For database-heavy apps with high concurrency, we architect around connection pooling and read replicas from the start. We load test before launch.

Yes — integration is core to most web app builds. Common integrations: CRM (HubSpot, Salesforce, Pipedrive), payments (Stripe, PayPal), email (SendGrid, Resend), calendar (Google Calendar, Calendly API), accounting (QuickBooks, Xero), SMS (Twilio), and shipping (ShipBob, EasyPost). If it has a REST API or webhook support, we can connect to it.

Every FactoryJet web application includes a 60-day post-launch warranty for bugs — behavior that doesn't match the agreed specification. Bugs are fixed at no charge within this period. Critical production bugs (app down, data loss risk) are responded to within 4 hours regardless of maintenance plan status.

No — the majority of our clients are business owners, not developers. Our discovery process is designed to extract technical requirements from non-technical input. Tell us what your users need to do and what success looks like — we translate that into an engineering spec you review and approve in plain English.

Yes — we do application rescues regularly. The first step is a codebase audit ($500, credited toward the project if you proceed) where we assess code quality, security posture, and architectural decisions. We give you an honest assessment of whether to continue building or start fresh. About 60% of rescues are 'continue with fixes' and 40% are 'rebuild the core.'

Yes — all FactoryJet web applications are tested on Chrome, Firefox, Safari, and Edge on desktop, and Chrome and Safari on iOS and Android mobile. Responsive design is built into the component library from the start. Accessibility (WCAG 2.1 AA) is included at no extra charge for all new builds.

Yes — we integrate large language models (OpenAI GPT-4, Anthropic Claude, Google Gemini) for features like: AI-assisted content generation, smart search and filtering, document summarization, automated customer response drafts, and data extraction from unstructured inputs. We also build retrieval-augmented generation (RAG) systems. AI features are quoted as add-ons to the base application scope.