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UK-based, ISO 27001-certified web application development agency

Web application development

We design and develop secure, custom web applications that streamline processes, connect systems and advance your purpose. Whether you’re modernising a legacy platform or building a new solution from scratch, we deliver powerful, reliable tools that boost efficiency and help your users.

Hero Image - One of the OWA client's systems displayed on a large screen
Hero Image - One of the OWA client's systems displayed on a mobile screen
Hero Image - Another of the OWA client's systems displayed on a large screen
500
+
PROJECTS COMPLETED
30
+
YEARS' EXPERIENCE
250
+
HAPPY CLIENTS
100
%
UK-BASED DEV TEAM
Solving complex digital challenges

Off-the-shelf software, hosting packages and technical support aren’t always the answer. Many organisations need applications tailored to their specific processes, legacy systems and security requirements. That’s where OWA comes in. We help you overcome technical obstacles with digital products, hosting and support solutions that work the way you do.

With a collaborative process that reduces risk
1
Discovery first
Understanding your systems, your users and your goals
2
Iterative design & delivery
Breaking complexity down to bite-size and adapting as we learn
3
Security at the core
Your ISO 27001-certified, Cyber Essentials-accredited Cloudflare partner
4
Partnership beyond launch
End-to-end service from build and go-live to ongoing hosting and support
Accreditation Logo - ISO
Cyber Essentials Certified - Logo
Cloudflare Logo
Crown Commercial Service  Supplier Accreditation
Accredited Channel Partner Accreditation
BIMA Member - Logo
WHY CHOOSE OWA?
What sets our web applications apart?

Take a look at how we’ve helped clients improve performance, modernise systems and solve complex challenges with our web application development.

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Custom-built
Every solution is designed specifically for your organisation.
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User-centred
UX and interfaces designed to simplify flows and improve adoption.
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Proven track record
30+ years of delivering secure solutions for business, public sector and not-for-profit organisations.
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Legacy modernisation
Integrate or replace older systems without disrupting day-to-day operations.
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Future-ready
Applications and products designed to adapt with you as your organisation grows.
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Secure hosting, responsive support
Peace of mind from fully managed UK hosting and 24/7 support and protection.
Real results, built to last

See how we’ve helped organisations launch new platforms and modernise legacy systems with measurable impact

With over 30 years of cross-industry experience in web application development, we’ll bring our deep understanding and sector-wide knowledge to your project.

Enterprise
Start-up
Public Sector
Government
Charity
Not-for-profit
Trade Union
Ecommerce
E-Learning
Advocacy
Education
Finance
Healthcare
Membership
Research
Training
Have more questions?
Have more questions? We’re here to help

We’re not just developers – we’re long-term partners, helping you to design, deliver and support a secure web application that evolves with your organisation.

Web application types, platforms & architecture

What types of web application do you develop?

OWA builds a wide range of web applications – from bespoke internal systems and customer portals to Software as a Service (SaaS) platforms, workflow tools and fully custom business applications. Every solution is shaped around your processes, users and long-term plans. If it runs in a browser, we can design it, build it and support it.

What’s the difference between a web application and a website?

A website is primarily informational, while a web application is interactive software accessed through the browser. Web applications handle user accounts, workflows, data processing and complex business logic, functioning much more like software products than traditional sites. OWA will help you identify the right approach based on your requirements.

Can you build scalable applications that grow as a user base increases?

Yes – scalability is a core principle of how OWA designs and builds applications. We plan architecture, databases, hosting and caching strategies to support growth in traffic, data and functionality without compromising performance. Your application will be ready to evolve as your organisation does.

Do you build progressive web apps that work on mobile devices?

Yes – OWA can develop progressive web apps (PWAs) that feel fast, responsive and app-like on any device. PWAs support offline access, push notifications and smooth mobile performance, making them a strong option when you want app functionality without maintaining a native mobile build.

What technologies and frameworks do you use for application development?

OWA works with modern PHP frameworks such as Symfony, along with JavaScript frameworks including Vue and React. Our choices depend on performance needs, architecture, maintainability and your existing technology landscape. We’ll recommend the best fit for your objectives.

Can you build web apps for enterprise use?

Yes – we build enterprise-grade applications that support complex workflows, permission structures, auditing and heavy usage. OWA also supports Single Sign-On (SSO), compliance requirements and integration with existing IT infrastructure. Performance, reliability and governance are built in from the outset.

Planning, discovery & development process

Do I need a specification or requirements to start an app development project?

Not always – if you’re still shaping the idea, OWA can help define scope through workshops, user journeys and technical discovery. If you already have documentation, we’ll work from it; if not, we’ll guide you through creating a clear, achievable plan, removing ambiguity before development begins.

How long does it take to develop a web application?

Timelines depend on complexity, integrations and features. Smaller applications may be delivered in several months, while larger systems are often phased over several releases. OWA will provide a clear roadmap once requirements are defined.

What is your development process for building a web application?

Our process includes discovery, user experience (UX) design, technical architecture, iterative development, testing and deployment. OWA provides regular demos so you can see progress as the application evolves. After launch, we continue with monitoring, optimisation and long-term support.

Do you offer fixed-price or flexible development options?

Yes – we offer fixed-price options for clearly defined scopes as standard and flexible time-based arrangements for exploratory work. OWA will help you choose the model that best fits your requirements, certainty and budget. Flexibility is built into how we work.

User experience & accessibility

What is your approach to user experience (UX) and user interface (UI) design for web applications?

We begin by mapping user journeys, sketching flows and prototyping to ensure clarity and usability. OWA then designs intuitive, accessible screens that support fast, low-friction task completion. Every decision is rooted in understanding how your users work and what they need to achieve.

Do your web apps meet accessibility standards (WCAG/AA)?

Yes – OWA designs and builds to WCAG 2.2 AA where required. This includes semantic structure, keyboard accessibility, colour contrast and full compatibility with assistive technologies. Accessibility is considered throughout design, development and testing.

Integrations, legacy systems & data migration

Do you integrate web applications with external APIs, third-party services or existing platforms?

Absolutely – integrations are a key part of modern application development. OWA connects systems securely with CRMs, payment gateways, data sources, internal tools and bespoke APIs. We ensure integrations are stable, secure and maintainable for long-term use.

Can you support or upgrade an existing web application?

Yes – OWA can review, stabilise and enhance applications built by other teams. This may include performance improvements, new features, security upgrades or long-term maintenance. We assess your current system and recommend the safest, most efficient path forward.

Do you work with legacy systems or older back-end technologies?

We do – supporting and modernising legacy systems is a core part of our work. OWA helps stabilise older frameworks, extend their lifespan or transition them to newer technologies in manageable phases. Our focus is always on stability and reducing risk.

Do you support data migration from an existing application or database?

Yes – OWA manages the full migration process, including mapping, cleaning, validating and importing structured and unstructured data. We plan migrations carefully to maintain accuracy, minimise downtime and ensure a smooth transition to the new platform.

Security, hosting & long-term support

Can you build applications that handle sensitive or regulated data?

Yes – OWA works with organisations that require strong security, compliance and auditability. We implement encrypted data storage, robust authentication, secure APIs and regulated hosting environments. We’ll guide you through best practice from the outset.

How secure are your development and hosting processes?

Our processes follow ISO 27001 standards and OWASP-aligned development practices. OWA applies secure coding, hardened environments, encrypted data flows and tightly controlled access. Security is considered at every stage, not added afterwards.

Where do you host web apps?

OWA provides fully managed, UK-based hosting designed for security, performance and uptime. We offer dedicated, cloud and hybrid options depending on your needs. All environments are monitored 24/7 by our in-house hosting team.

What technical support do you offer for web application updates and ongoing maintenance?

We provide ongoing support for security updates, bug fixes, new features and performance optimisation. OWA monitors uptime and system health, helping you keep your application stable and secure. Support packages are tailored to your platform and priorities.

Ready to transform your digital presence?

Whether you’re looking to create a new application or facing legacy system challenges and performance bottlenecks, we're here to help.

UK-based design and development

Project planning and scope definition

Technical architecture recommendations

Migration strategy for legacy systems

Fully managed UK-based hosting and support

Two OWA team members talking in a modern office.