Web & Mobile Development
Def Works builds performant, accessible websites, web apps, and mobile apps that work smoothly on every device and connection speed. We cover everything from marketing websites and ecommerce experiences to React Native and Flutter apps.
Cross-Platform Mobile Apps
React Native and Flutter apps that share a codebase while delivering a native feel on both iOS and Android.
Website & Web App Development
Fast websites and React applications optimised for Core Web Vitals, SEO, and conversion from the ground up.
Responsive UI Development
Component libraries and design-system implementations that scale consistently across screen sizes and themes.
Progressive Web Apps
Offline-capable, installable PWAs that close the gap between web and native for content-driven products.
API & Third-Party Integrations
Seamless connections to payment gateways, analytics platforms, CRMs, and custom back-end services.
Performance & Accessibility Auditing
Lighthouse-driven audits and WCAG-compliance reviews baked into the delivery process, not added as an afterthought.
Every engagement includes
Technologies we use
A delivery process built for certainty
UX Alignment
We review wireframes or designs with your team to align on interaction patterns before writing a line of code.
Component Architecture
A scalable component hierarchy is defined, referencing your design system or bootstrapping a new one.
Feature Sprints
Screens and flows are built iteratively with visual QA on real devices at every sprint boundary.
Release & Monitoring
We publish to app stores or CDN, configure real-user monitoring, and hand over a runbook for future releases.
Frequently asked questions
Do you build native or cross-platform mobile apps?
Both. We recommend cross-platform (React Native or Flutter) when budgets favour a shared codebase, and native Swift or Kotlin when performance or platform APIs demand it.
How do you handle App Store review delays?
We submit early, with TestFlight and internal testing builds so stakeholders can validate before public release regardless of review timing.
Can you take over a partially built front-end from another team?
Yes. We start with a code and design audit to baseline quality, then agree a remediation plan before adding new features.
What performance targets do you optimise for?
We target a Lighthouse Performance score above 90 and aim for sub-2-second Largest Contentful Paint on a mid-range device over 4G.
// Let's build
Ready to get started?
Book a discovery call with our senior delivery team. We'll scope your goals and propose a practical plan.