We build and support complex software and help organisations adopt AI with confidence.

For 17 years, our product, design and engineering teams have delivered business-critical digital services for growing businesses, regulated organisations and government.

From new platforms and legacy modernisation to practical AI and long-term support, we work alongside your team and remain accountable after launch.

Trusted by:

Why Bit Zesty?

Why work with us?

A senior product, design and engineering team for complex software, practical AI and the long-term support needed to keep both delivering value.

17 years of complex delivery

We build new digital services, modernise legacy systems and provide long-term support. Our average client retention is 2 years and our longest engagement is 13 years.

Security and quality built in

We are ISO 27001 and Cyber Essentials Plus certified, and have delivered services to the GOV.UK Service Standard. Review our technical assurance.

Our Awards

We have won the top industry awards for our work (BIMA GOLD, iF Design Gold Awards, GOV.UK Top 75 Service), and we are proud of our achievements.

One experienced team

Work with senior product, design, engineering, QA and DevOps specialists who can integrate with your team or take responsibility for delivery.

Practical AI adoption

We identify where AI can create measurable value, test the idea quickly and integrate successful solutions into secure, maintainable production systems.

150+ applications delivered

We have built or maintained over 150 applications, from focused prototypes to complex enterprise systems.

Client Success Stories

Case studies

We've been helping organisations to achieve their goals since 2009. Here are some of our latest and greatest projects.

View all case studies

Easol
Staff augmentation to extend the development team for an events e-commerce platform
Worked alongside the EASOL development team to help improve their app's performance, develop new features and upgrade their Ruby on Rails application. Their customers' sites now load twice as fast.
Business and Financial Services
E-commerce
Serious Readers
Supporting, maintaining and improving a bespoke Ruby on Rails e-commerce website.
We took over support and maintenance of a bespoke Ruby on Rails e-commerce site for Serious Readers, improving the stability and performance of the site.
E-commerce
B2C (Business to Consumer)
Talking Tables
Rewriting custom Shopify app to enable seamless syncing with an Enterprise Resource Planning (ERP) software
We created and maintained a bespoke Shopify application to sync customer and order data between their e-commerce platform and Enterprise Resource Planning (ERP) software.
E-commerce
B2C (Business to Consumer)
GOV.UK Trade Tariff
Making GOV.UK Trade Tariff (import/export tool) 3x faster and 10x cheaper to maintain
We rebuilt the complex tool to help users find the information they need easily. We continue to support it, and it now serves more than two million page views a month while meeting government digital standards.
Government and Charities
King's Awards for Enterprise
Streamlining the application process for the UK's most prestigious business awards
Through in-depth research, we rebuilt the service. The improvements met stringent government standards and made it easier for thousands of organisations to apply for the awards.
Government and Charities
Business and Financial Services
SXT
Reducing the spread of STIs, with a patient-friendly digital partner notification tool
Working closely with doctors and other health professionals, we developed a new digital service for SXT. The platform lets patients discreetly notify their partners about a potential infection, and helps clinics to meet their KPIs.
Health and Wellness

View all case studies

We deliver tangible results for our clients

237%

improvement in a clinic partner-notification KPI within four months

3x / 10x

faster to use and cheaper to maintain the GOV.UK Trade Tariff

3,500+

visa applications processed in under two months without increasing headcount

faster page loads for customers of an e-commerce SaaS platform

Our awards

View Our Awards

How we can help

Complex software and practical AI services

Build something new, modernise or support an existing system, apply AI to a defined problem, or add experienced specialists to your team.

Discovery

Software development

AI and automation

Design

Support and maintenance

Team augmentation

Tech stacks

Technologies we support

We specialise in modern open source technologies that power web and mobile applications. Each of our developers, on average, has ten years of experience in our core technology stack. Our expertise is focused on, but not limited to:

Ruby on Rails

React Native

ReactJS

Node.js

Vue.js

Shopify Hydrogen

Python & Django

PostgreSQL

MySQL

Elixir & Phoenix

MongoDB

Elasticsearch

"Bit Zesty has smart people who get up to speed very quickly. They have really listened effectively to what we do and brought forward exciting and innovative proposals for our online service. They have helped me and my team think of things in a different way. An impressive, professional team who are really easy to work with."

Linda Stephens

The Secretary to the King's Awards for Enterprise

News and updates