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This is Undefined

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A London studio building websites, e-stores and digital platforms that last.

London, United Kingdom1-10 employees2018
Established
Website

About This is Undefined

We take a human first approach to the digital world. Our commitment to building websites and apps that last means focusing on sustainable experiences rather than chasing the latest trends. We've been entrusted to deliver transformative digital change for a number of companies around the world – from new ventures to industry-leading businesses.

Services

Service Categories

BrandingCybersecurity

Industries Served(13)

Financial Services
Payments & Processing
Real Estate & Construction
PropTech

Tech Stack

% of projects using each technology

Frontend Framework

  • Nuxt51%
  • React51%

Backend Framework

  • NestJS76%
  • FastAPI31%

Mobile Platform

  • React Native96%

Projects

Reviews & testimonials

About reviews & testimonials50Pros profiles are storefronts for agencies. Agencies may share client testimonials from past projects or their own websites, with permission. These testimonials were not necessarily submitted directly to 50Pros and are not independently verified by 50Pros.We distinguish reviews submitted directly to 50Pros from agency-provided and imported testimonials. Only eligible reviews submitted directly by clients contribute to the overall rating.

Client testimonials provided by the agency. Not independently verified by 50Pros.

Matt Fien - CompliAI
Jul 2026

Undefined did an excellent job helping translate my initial ideas into a practical, well-designed MVP. The team's input, insight & guidance made them feel like a true extension of our in-house team rather than an external agency. I’d highly recommend Undefined to anyone looking for a trusted development partner to bring a new digital product or MVP to life.

Undefined helped Compliai & Matt refine the initial concept & Product Market Fit and go through multiple iterations to bring the concept to a place that was realistic to build & scale

Isabelle - We are MiQ
Jul 2026

The undefined time really took their time to understand our brand and how we work. They don't just execute, they think ahead, like they can read our minds. It always blows my mind how they have grasped our branding.

Undefined has redesigned & redeveloped the website, working closely with the MiQ team

James Dowler - Breathe with James
Jul 2026

Couldn't be happier or more grateful to have worked with them and would highly recommend them to anyone looking to develop a mobile app. They were brilliant.

Breathe with James is a breathwork and meditation app designed to help people slow down, reset, and find calm in their day.

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