Custom apps and platforms, Built like we’re part of your team.
We help companies design and develop mobile apps and web platforms that scale, with a sharp focus on speed, clarity, and user experience.
Trusted by product teams across industries
From mobile health apps to customer platforms and CRM tools, we’ve helped 90+ teams build fast, launch smarter, and stay flexible.
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We’ve helped over 60 clients build and launch more than 85 projects across mobile, CRM, and web platforms.
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United Kingdom | OYNB
United Kingdom | Trim
United Kingdom | OYNB
United Kingdom | Trim
What We Do.
We work across mobile, web, and interface systems, with the right balance of technical depth and user-first design.
We prioritize clean, intuitive interfaces that not only look good but also work better.
Adobe Photoshop
Adobe Illustrator
Figma
Adobe XD
Scalable, high-performing web platforms built to fit your workflow and grow with your business.
Frontend
React.js
Next.js
Angular
Vue
Typescript
HTML5
CSS
JavaScript
GraphQL
Apollo
MaterialUI
REST API
Backend
Node.js
Python
Scala
PHP
Java
Spring
.Net
Laravel
CMS
WordPress
Magento
Shopify
Contentful
We design and build mobile applications tailored to your users, from prototype to launch.
IOS
Swift
UI Kit
RxSwift
Combine
MVVM
Alomofire
Core Data
Android
Kotlin
MVVM
RxJava
Java
Retrofit
Jetpack
QA is integrated into every project from the outset. We catch issues before they become blockers.
Manual Testing
Functional Testing
Regression Testing
Smoke & Sanity Testing
Cross Browser Testing
UI/UX Review
Automation Testing
Selenium
Cypress
Playwright
Appium
TestNG
Performance & API Testing
JMeter
Postman
LoadRunner
REST API Testing
K6
We also support custom storefronts and CMS needs, as Shopify development partners and WordPress website designers.
Wordpress
Theme Development
Plugin Development
Plugin and Theme Customization
Third-Party Integration
Shopify
Theme Development
App Development
Automation
How We Work
We work closely with your team from start to finish, sharing aligned goals and maintaining full transparency throughout the process.
View More01/05
Discover
We align on product goals, user needs, and business context. This phase includes technical scoping, user insights, and early risk checks.
02/05
Design
We create user flows and interface designs that prioritize clarity, usability, and system logic, ready for handoff or direct build.
03/05
Build
Code is shipped in fast sprints, with regular demos and shared progress. We work in frameworks that support scalability and performance.
04/05
Testing/QA
Testing runs alongside development. We cover functionality, edge cases, and cross-device checks.
05/05
Launch + Support
Once live, we support performance monitoring, issue handling, and iterative improvements based on user or team feedback.
Discover
We align on product goals, user needs, and business context. This phase includes technical scoping, user insights, and early risk checks.
Design
We create user flows and interface designs that prioritize clarity, usability, and system logic, ready for handoff or direct build.
Build
Code is shipped in fast sprints, with regular demos and shared progress. We work in frameworks that support scalability and performance.
Testing/QA
Testing runs alongside development. We cover functionality, edge cases, and cross-device checks.
Launch + Support
Once live, we support performance monitoring, issue handling, and iterative improvements based on user or team feedback.
Featured Projects
A few builds we’ve worked on with clear goals, sharp delivery, and results that speak for themselves.
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Best for teams who build fast and stay focused
You might be scaling a mobile app, launching a CRM, or rebuilding your platform from the ground up. We plug in fast and build with care.
Tell Us About Your Project
Jen Fairburns
OYNB
Performant designed and built a refreshed website home page for us in Wordpress and did an excellent job. They were helpful and respectful but clearly knowledgeable in their field, offering expert advice and recommendations at each stage. From the outset, with very tight timelines, they proposed a clear schedule which they then stuck to, even though it ran over the holiday period. It was lovely to see design and development skills wrapped up so efficiently; they gave us three design approaches in Figma and then moved on to execute the Wordpress build seamlessly.
Andrew Hewitt
Yoh Digital Agency LLC
One of our most valuable agency partnerships, wouldn't have been possible to scale at speed without them.
Chand Sooran
Edgeworth Box
Very knowledgeable team. Easy to work with. Understood clearly the requirements after asking detailed questions. Extremely happy with the result, particularly the fact that they took it off my plate and I could trust them to execute (even without knowing them, but based on the way the PM talked about the project).
Mark C
Equities Club
They were brilliant, highly recommend. Really easy to deal with and knew their stuff. 10
Nathan Langton
Booked it
The team at Performantcode worked tirelessly to deliver the project, even with last-minute curve balls from us. The final product looks great, and we are going to continue using them for future projects. Communication was great, the work was completed quickly, and the support during go-live was much appreciated.
Dr Franz Lettenstrom
Bentham Science
Performant delivered excellent work on this FE development project and I enjoyed working with them. Communication was top-notch, met all deadlines, and skills were very strong. I enjoyed working with them and will likely have additional jobs for them in the future. Very few agencies have the ability to untangle complex requirements with ease and finesse. Highly Recommend!
Still figuring things out?
You don’t need to have everything mapped out. We’re happy to take a look, ask the right questions, and help you explore what’s possible.
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What teams say after working with us