Custom web & mobile app development
Build production-ready web applications, mobile apps, and SaaS platforms with InterCode. We are a full stack development agency that has shipped 50+ products — from early-stage MVPs to enterprise platforms handling millions of users.
What is Custom Web & Mobile App Development?
Custom web application development means building software designed specifically for your business requirements — as opposed to configuring an off-the-shelf SaaS tool or using a no-code platform. Custom software development gives you full control over the user experience, feature set, integration capabilities, and long-term architecture — at the cost of requiring a skilled engineering partner.
As a web app development company, InterCode specialises in product-grade applications — SaaS platforms, marketplaces, B2B tools, and consumer apps — that need to be reliable, scalable, and maintainable over years, not just months. Our engagements span custom software development across the full stack: React and Next.js for web frontends, Flutter and React Native development services for cross-platform mobile, Node.js and Python for backend APIs, and cloud infrastructure on AWS and GCP.
As a saas development company, we have specific expertise in the recurring patterns that SaaS products need: multi-tenancy, Stripe billing, role-based access control, feature flags, and the observability tooling that makes SaaS operations manageable at scale.
Development Services
Full-stack development across web, mobile, and SaaS — from design to deployment.
Web Application Development
Build scalable, performant web applications with React, Next.js, and TypeScript — from marketing sites and dashboards to complex B2B SaaS platforms with real-time features.
- React & Next.js development
- TypeScript codebase
- Server-side rendering & ISR
- Performance optimisation
Mobile App Development
Native-quality iOS and Android apps with Flutter or React Native — one codebase, two platforms, full access to device capabilities.
- Flutter cross-platform apps
- React Native development services
- iOS & Android deployment
- App Store & Play Store submission
SaaS Platform Development
Build multi-tenant SaaS platforms with all the infrastructure they require — authentication, Stripe billing, role-based access, admin dashboards, and tenant isolation.
- Multi-tenant architecture
- Stripe billing & subscription management
- Role-based access control (RBAC)
- Admin & analytics dashboards
Progressive Web Apps
PWAs that work offline, install on any device, and deliver app-like experiences without the App Store — ideal for B2B tools and field operations applications.
- Offline functionality (service workers)
- Push notification support
- Home screen installation
- Cross-platform compatibility
Backend & API Development
Design and build RESTful APIs and GraphQL endpoints that power your frontend, mobile apps, and third-party integrations — with proper authentication, rate limiting, and documentation.
- REST API development (Node.js, Python)
- GraphQL API design
- OpenAPI documentation
- Third-party integrations
UI/UX Design
Product design that converts — from wireframes and design systems to high-fidelity Figma prototypes and pixel-perfect front-end implementation.
- Figma wireframing & prototyping
- Design system creation
- Responsive design
- Accessibility (WCAG 2.1)
How We Deliver Web & Mobile Projects
Product Discovery & Technical Scoping
We run a structured discovery workshop to define requirements, user flows, and technical architecture — producing a scope document and effort estimate before any development begins.
- Requirements workshop
- User flow mapping
- Technical architecture design
- Scope document & estimate
Design & Prototype
Before building the full product, we design the UI in Figma and create an interactive prototype — validating the user experience and identifying design edge cases early.
- Figma UI design
- Interactive prototype
- Stakeholder review & approval
- Design system foundation
Full-Stack Development (2-Week Sprints)
Development runs in 2-week sprints with a demo at the end of each sprint. You see working software every two weeks — not just status updates.
- 2-week sprint cycles
- End-of-sprint demos
- Continuous deployment to staging
- Bi-weekly progress reports
Launch & Post-Launch Support
We handle production deployment, App Store submissions (for mobile), monitoring setup, and a 4-week post-launch support period to stabilise the product.
- Production deployment
- App Store submission (iOS/Android)
- Monitoring & alerting setup
- 4-week post-launch support
Product Discovery & Technical Scoping
We run a structured discovery workshop to define requirements, user flows, and technical architecture — producing a scope document and effort estimate before any development begins.
- Requirements workshop
- User flow mapping
- Technical architecture design
- Scope document & estimate
Design & Prototype
Before building the full product, we design the UI in Figma and create an interactive prototype — validating the user experience and identifying design edge cases early.
- Figma UI design
- Interactive prototype
- Stakeholder review & approval
- Design system foundation
Full-Stack Development (2-Week Sprints)
Development runs in 2-week sprints with a demo at the end of each sprint. You see working software every two weeks — not just status updates.
- 2-week sprint cycles
- End-of-sprint demos
- Continuous deployment to staging
- Bi-weekly progress reports
Launch & Post-Launch Support
We handle production deployment, App Store submissions (for mobile), monitoring setup, and a 4-week post-launch support period to stabilise the product.
- Production deployment
- App Store submission (iOS/Android)
- Monitoring & alerting setup
- 4-week post-launch support
Our Technology Stack
We build with the technologies that give your product the best long-term foundation — not the ones with the most hype.
Our primary web stack is Next.js with TypeScript — it gives us server-side rendering, excellent SEO, and great developer experience. For mobile, Flutter is our default for cross-platform apps; React Native development services are available for teams already invested in the React ecosystem. For backend, we use Node.js (NestJS) for most APIs and Python for data-intensive workloads. We always choose based on your specific requirements, team familiarity, and long-term maintainability.
Products We Have Built
Built a full-stack multifamily property management SaaS platform — tenant portal, maintenance tracking, lease management, and marketing automation — serving thousands of property units across the US.
View case studyDeveloped a cross-platform mobile app for Emirates event management with real-time features, offline support, and seamless App Store deployment — achieving a 4.8-star rating from users.
View case studyBuilt a complex workflow management SaaS platform in 8 weeks — full-stack development with multi-tenancy, real-time collaboration features, and enterprise integrations — using our AI-assisted development workflow.
View case studyWhy Choose InterCode for Web & Mobile Development
Full-Stack Teams, No Handoffs
One team covers design, frontend, backend, and DevOps for your entire project. No handoff delays between siloed specialists, no communication gaps, no blame when the frontend and backend do not match. A single team owns the full product end-to-end.
Startup-Tested Architecture
We build with the architecture patterns that scale — multi-tenant data isolation, stateless APIs, CDN-optimised frontends. This means your product works at 100 users and 100,000 users without expensive rewrites when you scale.
Fortnightly Working Software
2-week sprint cycles with a demo at the end of every sprint. You see working software every two weeks — not a Gantt chart and a status update. This keeps us aligned and catches requirement mismatches before they become expensive.
Quality Built-In, Not Bolted On
80%+ test coverage, automated security scanning, performance budgets, and accessibility compliance are part of every engagement — not optional add-ons. We build software you will be proud to show your enterprise clients.
Related Case Studies
WebRTC Testing & Monitoring SaaS — TestRTC
SaaS Platform that offers tools in order to assist clients in improving their services. The product solves all the hard problems in making testing and monitoring WebRTC products a breeze.
Read case study webHow a Digital Marketing Agency Built a BI Platform for Multifamily Marketing Analytics
A luxury apartment marketing agency was losing money and clients to a rigid no-code BI tool. InterCode replaced it with a cloud-native data and analytics platform on Google Cloud Platform — cutting costs by 75%, loading dashboards in under 3 seconds, and onboarding new clients 4x faster. This case study breaks down the challenge, the solution, and the results.
Read case study webAI Apartment Marketing SaaS — Respage
Real estate Saas platform with events calendar, reports, chatbot, 3rd party API integrations, email and push notifications. Implemented in NodeJs, ExpressJs, MongoDb, Angular. Wide use of micro front-ends. Multifamily industry.
Read case studyFurther Reading
Vibe Coding vs. Spec-Driven Development: The Future of AI-Assisted Software Engineering in 2026
Read article →Custom Code vs No-Code vs AІ
Read article →Flutter: The choice of technology that is becoming the standard among the big players.
Read article →Frequently Asked Questions
Custom web application development costs vary significantly by scope. A simple web app MVP (4–6 features, basic auth, one user type) typically costs $25,000–$50,000. A full-featured SaaS platform with multi-tenancy, billing, and integrations typically costs $75,000–$200,000+. We provide a detailed estimate after a free scoping session. For ongoing development, dedicated team models start from $12,000/month for a 2-engineer team.
Both Flutter and React Native development services deliver cross-platform mobile apps from a single codebase. Flutter uses Dart and renders via its own graphics engine — giving more consistent UI across iOS and Android, better performance, and growing adoption as cross-platform standard. React Native uses JavaScript and renders native components — better for teams already in the React ecosystem. We default to Flutter for new mobile projects but offer React Native for teams with existing React expertise.
A SaaS platform MVP — covering core user flows, authentication, basic billing, and primary features — typically takes 8–16 weeks using our AI-assisted development workflow. A full-featured platform with advanced billing, multi-tenancy, admin tools, and integrations takes 16–32 weeks. We always start with a discovery phase that produces a detailed scope and timeline estimate before any development begins.
Yes. All project engagements include a 4-week post-launch support period at no additional cost. Beyond that, we offer dedicated maintenance retainers (starting from $3,000/month) covering bug fixes, security updates, and minor feature improvements. For products in active growth, we recommend a dedicated development team retainer to continue shipping features continuously.
Yes — we regularly take over codebases from other agencies or internal teams. We start with a 2-week technical audit covering code quality, test coverage, security, and architecture. This produces a health report and remediation plan. For healthy codebases we can begin feature development immediately; for codebases with significant technical debt, we recommend a stabilisation sprint before new feature development.
Ready to Build Your Product?
Tell us what you are building. We will scope it, design the architecture, and give you a timeline and estimate — in a free 60-minute technical consultation.
Contact Us