React Web Application Development
SaaS • Customer portals • Dashboards • B2B systems
A web application is no longer a site — it's full-featured software in the browser. SaaS platforms, analytics dashboards, customer portals, internal corporate systems. I build on React + TypeScript with architecture designed for growth and scale.
What counts as a web app
A web app differs from a site in two ways: users work inside it (not just read), and it requires authentication, real-time data processing, and complex logic. Examples: CRM systems, accounting tools, analytics dashboards, B2B SaaS, learning platforms, team tools.
Unlike a landing or store, architecture is critical here. A poorly designed web app becomes impossible to maintain within a year — tech debt strangles every new feature. So I start with foundations: data structure, API, auth, role separation.
Stack: React + TypeScript on the frontend, Node.js (NestJS) or Astro+API endpoints on the backend, PostgreSQL for data, Redis for cache, Auth0/Clerk or custom auth. Deployment: Vercel, Railway, or your own server. External API integrations as needed.
Who it's for
Internal company tool
Client tracking, inventory, scheduling, requests — replaces Excel sheets and a stack of 5 services. Built around your specific processes, no paying for unused modules of ready SaaS.
SaaS product for market
You're launching your own startup: subscription, user account, billing, in-product analytics. I deliver an MVP in 2-3 months, then iterate based on user feedback.
Customer portal
You already have a business (wholesale supplier, agency, subscription service) — customers need a personal area: order history, documents, requests, chat with a manager. Cuts 80% of routine load off support.
Dashboard / analytics
You collect data from many sources (CRM, ads, metrics, inventory) and want one unified view. A custom dashboard around your KPIs instead of switching between disjointed tabs.
Custom development vs no-code vs ready SaaS
Three ways to get a web application. Each has its trade-offs — choice depends on budget, timeline, and how strategic the product is.
| Parameter | Custom development | No-code (Bubble etc.) | Ready SaaS |
|---|---|---|---|
| Launch | 2-6 months, from $2,000 | 2-8 weeks, from $500 | 1 day, from $10/month |
| Total cost of ownership | Maintenance + server | Platform subscription $30-300/mo | Subscription $10-200/user/mo |
| Business logic customization | Full — any logic | Within platform limits | Only what's pre-built |
| Performance | High — optimized per task | Average — generic engine | Depends on SaaS |
| Compliance / data location | Full control, on-prem possible | Hosted by platform (often abroad) | Depends on SaaS |
| Scale (10k+ users) | Fine, designed for it | Hits platform limits | Can scale, but expensive |
| Best for | Unique business logic, growth | MVP, internal tool | Standard task (CRM, helpdesk) |
What's included
Architecture & design
I don't write code immediately. First — analyzing the task, drawing the data schema, designing the API, role model. Pays off long-term.
React + TypeScript frontend
Modern stack: React 19, TypeScript, Vite/Astro, TanStack Query/Router, Zustand or Redux Toolkit for state.
Backend & database
Node.js with NestJS or Astro API routes. PostgreSQL, Prisma ORM. Migrations, backups, logging.
Authentication & roles
OAuth (Google, GitHub), email/password, magic links. Flexible RBAC permissions model.
Real-time data
WebSockets, Server-Sent Events, optimistic updates. See changes instantly without page reloads.
External API integrations
Payments, messengers (Telegram, WhatsApp), CRM, ERP, shipping providers. Tailored to your domain.
Customer portal & admin
User-facing UI + admin control panel. Different permissions and visibility per role.
DevOps & deployment
CI/CD via GitHub Actions, Docker containers, monitoring (Sentry), DB backups, documentation for ongoing maintenance.
Pricing
Price depends on functionality scope. Three typical tiers:
MVP
- 1 core feature + admin
- Authentication (email + OAuth)
- Basic DB and API
- Simple dashboard
- Deploy to Vercel/Railway
Full product
- Complex architecture with role separation
- Real-time data
- Payments and subscriptions
- Integrations with 3-5 external APIs
- Advanced dashboard and reports
- Documentation and tests
Enterprise
- Complex business logic
- Multi-server architecture
- SLA and 24/7 monitoring
- GDPR / SOC2 compliance
- Team scaling if needed
- 100+ hours/month support
How we work
- 1
Discovery & spec
Deep brief, user scenarios, roles, integration requirements. Final spec with success metrics.
Duration: 1-2 weeks - 2
Architecture & prototype
Data schema, ER diagram, API spec. UX prototype for key screens. Stack agreement.
Duration: 1-2 weeks - 3
UI design
Design for all screens, components, dark/light themes if needed. Design system for scalability.
Duration: 2-4 weeks - 4
Sprint development
Two-week sprints with demos. Each sprint delivers a working chunk you can test.
Duration: 2-4 months - 5
Testing, docs, launch
QA, load testing, dev and user docs, team training, production deploy.
Duration: 2-3 weeks
Frequently asked questions
How is it different from a website?
A site shows content. A web app is a tool you use for work. If it has authentication, personal data, real-time user actions — it's an app. Price and complexity are fundamentally different.
What does it actually cost?
Cost depends heavily on complexity. Solo MVP (one core feature + admin) — from $2,000 over 6-10 weeks. Full product — from $5,000 and 3+ months. Enterprise — discussed separately. Free audit and exact quote within 24 hours.
Solo or with a team?
I currently work solo: frontend, backend, design, deploy. This eliminates coordination overhead — your money goes into work, not management. If the task requires multiple developers — I can bring in vetted people and lead them.
What about post-launch support?
Support is mandatory for serious apps. I offer monthly retainers from $300/month for bug fixes, minor improvements, monitoring. Major new features — separate projects.
Will you deploy on our server or yours?
Flexible. If you have your own infrastructure and DevOps — I deploy to you and hand off. If not — Vercel/Railway/your own VPS. All credentials and repositories are yours, no vendor lock-in.
What about security and personal data storage?
For apps handling personal data of EU/RU citizens — we host on compliant infrastructure (GDPR / 152-FZ). I implement 2FA, encrypted sensitive fields in DB, audit logs, regular backups. External pentest can be arranged on request (extra).
Could no-code (Bubble, Webflow) do this instead?
Sometimes yes — for an MVP or internal tool, no-code is faster and cheaper. Downsides: hits platform limits as you scale, monthly subscriptions, issues with performance and custom logic. If the product is business-critical or needs to scale — go with code. I'll help you decide what fits.
Who owns the code?
You do. I transfer the GitHub/GitLab repository to your account, source-code rights are spelled out in the contract. No vendor lock-in: you can move to another developer or bring it in-house anytime. Documentation and architecture decisions are handed over too.
Ready to discuss your project?
Free audit and preliminary estimate within 24 hours of your request.
Send a request