Overview
A web application is often the most visible piece of software a business operates. It is where customers interact with your platform, where internal teams manage operations, where partners access data, and where the capability of your technology is most directly experienced by the people who depend on it. When that application is slow, unreliable, or constrained by the limitations of a generic platform, the impact is immediate and felt across the business.
We build custom web applications from the ground up — designed around your specific requirements, built with the technology best suited to your performance and scalability needs, and delivered as production-ready software that handles real-world load without compromise.
Our web application stack centres on React and Next.js for the frontend, Rust for high-performance custom HTTP servers and API backends, and C# for complex backend services and enterprise integrations. We use JavaScript and TypeScript where they add value, and we do not add technology for its own sake — every choice in the stack is made because it is the right tool for what the application needs to do.
What We Build
Single-Page Applications (SPAs) A single-page application loads once and updates dynamically as the user interacts with it — delivering the responsiveness of a native application within the browser. SPAs are the right architecture for applications where user experience demands immediate feedback, where the interaction model is complex and stateful, and where the overhead of full-page reloads would degrade the experience unacceptably.
We build SPAs with React, managing application state with the appropriate tools for the complexity of the application — from React's built-in state management for simpler applications to more structured state management patterns for applications with complex shared state across many components. API communication is handled through typed client layers that provide compile-time safety and consistent error handling across every backend interaction.
Progressive Web Applications (PWAs) Progressive web applications extend the web application model with capabilities that were previously only available to native apps — offline operation, push notifications, home screen installation, and background synchronisation. For applications that need to work reliably in low-connectivity environments, provide native-app-like engagement, or reach users across devices without the friction of app store distribution, PWA architecture delivers native-adjacent capabilities through the web.
We implement PWA features with deliberate attention to the service worker architecture that underpins them — cache strategies, offline fallback behaviour, background sync patterns, and push notification handling are all designed explicitly rather than bolted on as afterthoughts.
Complex Web Portals Multi-stakeholder web portals — where different user types have different views, different permissions, different workflows, and different data access — require careful architecture from the start. Customer portals, partner portals, supplier portals, employee intranets, and administrative interfaces all fall into this category.
We design portal architectures with role-based access control built into both the frontend rendering logic and the backend API layer, ensuring that authorisation is enforced at both levels rather than relying on frontend routing alone. Multi-tenancy, white-labelling, and per-organisation configuration are handled at the data and API layer, producing portals that serve multiple distinct user groups from a single coherent application.
SaaS Platforms Software-as-a-service platforms introduce a specific set of architectural requirements — multi-tenancy, subscription and billing management, usage metering, tenant isolation, and the scalability to serve many organisations simultaneously from shared infrastructure while keeping each tenant's data appropriately separated.
We build SaaS platforms with these requirements addressed at the architectural level from the beginning — not retrofitted after the product has launched and the constraints of a single-tenant architecture have become apparent. Tenant onboarding flows, subscription management integrated with payment processors, usage dashboards, and administrative tooling for managing the platform itself are all built as first-class parts of the product.
Internal Web Applications Internal tools — operational dashboards, data management interfaces, workflow systems, reporting applications — benefit from web delivery because they are accessible from any device without installation, can be updated centrally without coordinating client updates, and can be integrated with the browser-based tools the team already uses.
We build internal web applications with the same engineering rigour as customer-facing products — with authentication, role-based access, audit logging, and the performance characteristics that make tools people actually want to use rather than tolerate.
Real-Time Web Applications Applications that require live data updates — trading dashboards, operational monitoring systems, collaborative tools, live analytics interfaces — need WebSocket or Server-Sent Events architecture rather than polling-based data refresh. We build real-time web applications with Rust-backed WebSocket servers capable of handling thousands of concurrent connections with minimal resource overhead, delivering data to connected clients as it changes rather than on request cycles.
The Technology Stack in Detail
React and Next.js — Frontend
React is our primary frontend framework for custom web applications. Its component model maps naturally to complex UI requirements, its ecosystem covers every frontend need we encounter, and its server-side rendering capabilities through Next.js address the performance and SEO requirements of public-facing applications.
Next.js extends React with server-side rendering, static generation, incremental static regeneration, and API routes — giving us the full range of rendering strategies to apply to each part of an application based on its specific requirements. Pages that need SEO get server-side rendered or statically generated. Highly interactive sections get client-side rendering. Data-heavy sections get incremental static regeneration with appropriate revalidation intervals. We apply each strategy where it fits rather than forcing the entire application into one rendering model.
TypeScript is used throughout our frontend work. The type safety it provides across component interfaces, API response handling, and application state management eliminates entire categories of runtime errors and makes large frontend codebases significantly more maintainable as they grow.
Rust — High-Performance HTTP Servers and API Backends
For applications where performance is a primary requirement — high-concurrency APIs, real-time data servers, applications with strict latency targets, or platforms that need to handle traffic spikes without the resource overhead of heavier runtimes — we build custom HTTP servers and API backends in Rust using Axum.
Rust's performance characteristics are fundamentally different from most web backend languages. No garbage collector means no GC pause latency. Minimal runtime overhead means predictable response times under load. Memory efficiency means more concurrent connections per server instance. For applications where these characteristics matter — and for many web applications at scale they do — Rust backends deliver performance that other stacks cannot match without significantly more infrastructure.
Our Rust web backends handle routing, middleware, authentication, request validation, database access via sqlx, response serialisation, and WebSocket connection management — the full backend stack, not just performance-critical components.
C# / ASP.NET Core — Enterprise Backend Services
For backend services that integrate deeply with Microsoft ecosystem platforms, require complex business logic that maps well to object-oriented patterns, or need to interface with systems that have existing C# integration libraries, we build backend services in C# with ASP.NET Core.
C# backend services are our choice for enterprise integrations and other platforms with mature .NET SDKs, processing Excel and Office documents with full fidelity, and implementing complex business logic with the language features and type system that C# provides.
JavaScript and TypeScript — Where They Add Value
JavaScript and TypeScript appear in our stack where they are the right tool — frontend application code, Next.js API routes for frontend-adjacent backend logic, serverless functions, and integrations with platforms whose SDKs are JavaScript-native. We use them deliberately rather than as defaults, choosing Rust or C# for backend services where their performance or type system characteristics are better suited to the requirement.
Performance as a Design Constraint
Web application performance is not something to optimise after the application is built — it is a design constraint that shapes architectural decisions from the beginning. Applications that perform well under load are architected for it, not tuned for it after the fact.
Frontend performance. Bundle size, code splitting, lazy loading, image optimisation, font loading strategy, and critical path rendering are all addressed during development rather than audited after launch. We target Core Web Vitals scores that reflect actual user experience — Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint — not just Lighthouse scores on localhost.
Backend performance. Database query optimisation, connection pooling, caching at appropriate layers, and efficient serialisation are built into backend services from the start. For Rust backends, the performance baseline is high enough that most applications never encounter backend bottlenecks — but we design for scale regardless.
Network performance. HTTP/2 and HTTP/3, response compression, efficient cache headers, and CDN-friendly static asset serving are all standard practice, not optional additions.
Security Built In
Web applications are the most exposed surface of any software system — directly accessible from the internet, interacting with user data, and targeted by automated attacks at scale. We build security in rather than adding it later:
Authentication is implemented correctly — password hashing with appropriate algorithms, session management with proper invalidation, OAuth2 and OIDC integration for third-party authentication, and multi-factor authentication where the application requires it.
Input validation and output encoding are applied consistently — SQL injection, XSS, CSRF, and path traversal vulnerabilities are prevented at the architecture level, not defended against one endpoint at a time.
Dependency management is handled carefully — third-party packages are evaluated before inclusion, kept updated, and audited for known vulnerabilities as part of the development process.
Technologies Used
- React — component-based frontend development for SPAs, PWAs, and complex web interfaces
- Next.js — server-side rendering, static generation, API routes, and full-stack React applications
- TypeScript — type-safe frontend and backend JavaScript across the entire stack
- Rust / Axum — high-performance custom HTTP servers, real-time WebSocket backends, latency-critical API services
- C# / ASP.NET Core — enterprise backend services, complex business logic, Microsoft ecosystem integrations
- SQL (PostgreSQL, MySQL, SQLite) — relational data storage for all web application backends
- Redis — session storage, application caching, WebSocket pub/sub for scaled real-time applications
- Docker — containerised deployment for consistent development and production environments
- Auth0 / JWT / OAuth2 — authentication and authorisation for web applications and APIs
- Tailwind CSS — utility-first CSS for consistent, maintainable frontend styling
From Concept to Production
Web application projects with us follow a path from initial scoping through to production deployment and beyond:
Scoping and architecture. We start by understanding what the application needs to do, who it serves, what performance and scalability requirements apply, and what systems it needs to integrate with. From this we produce an architecture that addresses the requirements without over-engineering for hypothetical future needs.
Iterative development. We deliver working software in iterations — starting with the core functionality that validates the product, expanding from there with each sprint building on a working foundation. Stakeholders interact with real working software throughout development rather than reviewing wireframes and specifications.
Testing and quality. Unit tests, integration tests, and end-to-end tests are written as part of development, not as a separate phase. Code review, static analysis, and performance profiling are standard practice throughout.
Deployment and infrastructure. We configure deployment pipelines, server infrastructure, monitoring, and alerting as part of the project — not as an afterthought before go-live.
Post-launch support. Web applications evolve. Requirements change, traffic grows, integrations need updating, and new features get prioritised. We support applications after launch with maintenance, feature development, and infrastructure management.
Let's Build Your Web Application
Whether you are starting from scratch, replacing a platform that has outgrown its original architecture, or adding a web application layer to an existing system — we have the stack, the experience, and the approach to deliver it correctly.