How much does custom web application development cost?

Web development project costs vary based on complexity, feature scope, and third-party integrations. Focused MVP web applications typically range from $15,000 to $40,000 and launch in 4–8 weeks. Full-scale enterprise SaaS platforms with multi-tenancy, custom billing, and advanced dashboards typically range from $40,000 to $150,000+. We provide fixed-price milestone contracts or dedicated team retainers.

Who owns the source code and intellectual property (IP)?

You retain 100% full ownership of all intellectual property, source code, designs, and architectural documentation created during our engagement. Code is committed directly to your private GitHub or GitLab repository from day one.

What tech stack do you recommend for custom web apps?

We primarily architect with Next.js 15, React 19, TypeScript, TailwindCSS, Node.js, and PostgreSQL, deployed to Vercel or AWS. This stack guarantees Lighthouse 100 Core Web Vitals, enterprise security, rapid rendering via React Server Components, and seamless scale to millions of users.

Does your agency develop for both iOS and Android?

Yes. We build native iOS (Swift/SwiftUI), native Android (Kotlin), and cross-platform apps using React Native and Flutter. Cross-platform allows launching high-performance apps on both the Apple App Store and Google Play from a single unified codebase, cutting development costs and time-to-market by up to 40%.

Do you handle Apple App Store and Google Play approvals?

Yes, we provide end-to-end App Store and Google Play submission management. Our team handles certificate management, privacy declarations, screenshot generation, in-app purchase setups, and guidelines compliance with a 100% approval track record.

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Custom Web Application & SaaS Development Agency

Web Development Agency | Custom Web Apps & SaaS

For: Startups, scaleups, and enterprises seeking a dedicated agency to engineer custom, production-grade web applications.

As a full-cycle web development agency, Zaeon Systems turns complex business requirements into elegant, high-speed web applications. We architect modern web applications with Next.js 15, React, TypeScript, and serverless backends - engineered from day one for Core Web Vitals, enterprise security, modular scalability, and flawless user experiences.

Development Agency Service

Web Development by Zaeon Systems

Looking for a web development agency? Zaeon Systems designs and engineers high-performance Next.js web applications, SaaS platforms, and enterprise portals with Lighthouse 100 speed and 100% IP ownership.

Key Capabilities

→Full-Stack Next.js 15 & React Architecture
→Custom SaaS Platforms with Multi-Tenancy & Billing
→Lighthouse 100 Core Web Vitals & Technical SEO
→API-First Backend Integration (REST, GraphQL, gRPC)
→Role-Based Access Control (RBAC) & OAuth/SSO Security
→Modular Micro-Frontends & High-Throughput Databases

Industry Use Cases

Lighthouse 100 performance & sub-second page loadsMVP delivered and launched in 4 to 8 weeks100% intellectual property (IP) and source code ownership35%+ increase in visitor-to-customer conversion rates

Technologies Used

Next.jsReactTypeScriptNode.jsTailwindCSSPostgreSQLRedisDockerVercelAWS

Key Capabilities

Full-Stack Next.js 15 & React Architecture
Custom SaaS Platforms with Multi-Tenancy & Billing
Lighthouse 100 Core Web Vitals & Technical SEO
API-First Backend Integration (REST, GraphQL, gRPC)
Role-Based Access Control (RBAC) & OAuth/SSO Security
Modular Micro-Frontends & High-Throughput Databases

Business Outcomes

✓Lighthouse 100 performance & sub-second page loads
✓MVP delivered and launched in 4 to 8 weeks
✓100% intellectual property (IP) and source code ownership
✓35%+ increase in visitor-to-customer conversion rates

Tech & Tools

Next.jsReactTypeScriptNode.jsTailwindCSSPostgreSQLRedisDockerVercelAWS

Discuss Your Project

What We Build

Web Development Solutions We Deliver

Every project is engineered to production-grade standards with full source-code ownership, documentation, and post-launch SLA support.

SaaS

Enterprise SaaS Platforms

Multi-tenant SaaS products with automated subscription billing, team management, analytics dashboards, and role permissions.

Web App

Custom Web Applications

Bespoke workflow automation tools, client portals, internal dashboards, and data visualization platforms tailored to your business.

Commerce

E-Commerce & Marketplaces

High-volume headless commerce and marketplace platforms with real-time inventory, payment gateways, and checkout optimization.

PWA

Progressive Web Apps (PWA)

Installable web apps that deliver app-like offline capabilities, push notifications, and ultra-smooth 60fps animations.

How We Work

Our Web Development Engagement Process

Discovery & Technical Blueprint

We analyze your product vision, target market, user journeys, and technical constraints to deliver a rock-solid architectural roadmap.

UI/UX Design & Clickable Prototype

Designers create high-fidelity Figma prototypes and a design token system ensuring brand alignment and effortless user conversion.

Agile Sprint Engineering

Bi-weekly sprint releases with continuous staging previews, automated test coverage, and transparent milestone demonstrations.

QA, Security & Core Web Vitals Audit

Rigorous cross-browser QA, vulnerability scanning, accessibility (WCAG 2.1 AA) validation, and Lighthouse 100 performance tuning.

Production Launch & 24/7 SLA

Seamless zero-downtime deployment to production CDN edge, comprehensive documentation handoff, and ongoing SLA maintenance.

What You Receive

Project Deliverables

Every web development engagement includes full handover with 100% IP ownership and 30-day post-launch warranty.

Complete Source Code

100% client-owned GitHub/GitLab repository with clean, modular TypeScript code.

Production Deployment

Fully configured CI/CD pipeline on Vercel or AWS with edge caching and zero downtime.

Documentation & Schemas

Comprehensive API documentation, architecture diagrams, and developer onboarding guide.

30-Day Post-Launch Warranty

Full bug fixes, performance monitoring, and handover support included at no extra cost.

Frequently Asked Questions – Web Development

Common questions about Zaeon Systems' Web Development agency services, pricing, timeline, and technology stack.

Hiring Zaeon Systems starts with a free 30-minute discovery call where we review your project requirements, user journeys, timeline, and tech stack preferences. Within 48 hours, we provide a detailed scope breakdown, technical architecture proposal, and transparent pricing estimate. Once approved, our dedicated engineering squad can onboard within 5 business days.

Get Started Today

Ready to Build Something Extraordinary?

Book a free strategy call with our engineering team. No commitments -just an honest conversation about building software that scales your business.

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