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We design and build custom web applications for startups and ambitious teams. From product discovery and UX to scalable architecture and engineering, we deliver secure, high-performance web apps built for real-world use.
“Whether you’re shaping a product at pre-seed, scaling after launch, or navigating a strategic pivot, we partner with founders to design, build and evolve software that supports real growth — from early validation to long-term execution.”
Venture Capital and Growth Equity Firm in London
Fintech Startup Based in London
Leading Architectural Firm Based in London
Global Cybersecurity Firm
We start by understanding your business goals, users, and technical requirements. Through stakeholder workshops, requirements analysis, and technical discovery, we define scope, priorities, and a clear delivery plan for your web application.
Before development begins, we design user flows, interfaces, and technical architecture for your web application. UX and UI design ensure usability and clarity, while technical planning ensures the system is scalable, secure, and maintainable.
We design robust system architecture, data models, and integrations to support performance, security, and future growth. Clear documentation and design systems reduce ambiguity and create a strong foundation for long-term web application development.
Our engineering team builds your web application in structured iterations, delivering features incrementally with regular reviews and feedback loops. This approach allows us to validate functionality early, adapt to change, and maintain high code quality throughout development.
We support deployment and launch by assisting with infrastructure setup, monitoring, and performance optimisation. Your web application is released in a controlled, production-ready environment to ensure stability and reliability from day one.
After launch, we help teams evolve their web applications through ongoing optimisation, feature development, and technical improvements based on user behaviour, performance data, and business priorities.
Average startup valuation (£££') after our MVP development at the pre-seed stage
In funding (£££') secured owning to our design and development services
Projects designed, engineered, and scaled by our team
Percentage of clients securing funding after working with us
We build secure, high-performance web applications for financial services, focusing on reliability, compliance, and scalability. Our work spans platforms for payments, dashboards, analytics, and financial operations where data integrity and system stability are critical.
We design and develop AI-powered web applications that translate complex models, data, and logic into usable, production-ready systems. Our focus is on performance, explainability, and scalable architectures that support real-world deployment.
We build scalable SaaS web applications with a strong focus on product architecture, maintainability, and long-term growth. From early platforms to mature products, we support evolving complexity, usage, and feature sets.
We develop secure, compliant web applications for healthcare and life sciences, balancing usability with system reliability in regulated and data-sensitive environments. Our approach prioritises stability, accessibility, and long-term system integrity.
We create web platforms that simplify property workflows, improve transparency, and support seamless interactions across real estate systems. Our solutions focus on performance, data consistency, and scalable integrations.
We build robust legal technology applications that simplify complex processes and deliver reliable, scalable software for professionals and end users. Emphasis is placed on clarity, security, and maintainable system design.
Building a modern web application allows teams to deliver powerful, scalable software accessible across devices and platforms. A well-designed web app improves performance, usability, and maintainability — enabling businesses to launch faster, iterate efficiently, and support long-term growth without unnecessary complexity.
We build sleek, high-performance interfaces using React, Next.js, and Vue.js to create engaging web interfaces for MVPs that resonate with users.
We develop scalable backend systems using Node.js, Python, and Go to ensure secure, reliable support for your MVP’s growth.
We create high-performance mobile apps for iOS and Android using React Native, Kotlin, and Swift, delivering seamless cross-platform user experiences for your startup.
Our low-code solutions speed up development process, using tools like Webflow and Framer for adaptable, flexible landing pages that meet your company's needs.
We implement automated workflows and continuous integration/continuous deployment (CI/CD) practices to optimise efficiency, ensuring smooth deployment and faster iteration cycles for your MVP.
To enhance your tech stack, we integrate third-party services such as payment gateways, CRMs, Open Banking, and OpenAI models, ensuring your startup remains competitive in the market.
Web application development is the process of designing, building, and maintaining software applications that run in a web browser. These applications are accessible across devices, do not require installation, and are typically powered by a frontend interface, backend logic, APIs, and cloud infrastructure.
A website is primarily informational, while a web application is interactive and functional. Web apps allow users to perform actions such as managing data, processing transactions, collaborating in real time, or accessing personalised dashboards. Examples include SaaS platforms, admin panels, internal tools, and customer portals.
Modern web applications typically use technologies such as React, Vue, or Next.js on the frontend, and Node.js, Python, or similar frameworks on the backend. They are often supported by cloud services, databases, APIs, authentication systems, and scalable infrastructure to ensure performance and security.
The timeline depends on complexity, features, and integrations. A simple web application may take a few weeks, while more complex platforms can take several months. A structured discovery and technical planning phase helps define scope, reduce risk, and create realistic delivery timelines.
Yes. When built with scalable architecture and modern infrastructure, web applications can grow alongside your business. This includes handling increased users, data volume, and new features without requiring a full rebuild, ensuring long-term performance and maintainability.
© 2020-2025 Rattlesnake Group Limited.
Rattlesnake Group Limited is a limited liability company registered in England and Wales. Registered number: 12551349. Registered address: 124 City Road, London EC1V 2NX. VAT Registration Number: 436362592.
