9 IT Companies in the UK to Know – Built In

Explore some of the companies leading the U.K.’s vibrant IT sector.
Hundreds of thousands of IT companies call the United Kingdom home, providing diverse services aimed at helping businesses all over the world maintain and optimize their technology operations. Bringing expertise in everything from artificial intelligence to cybersecurity, these are just some of the companies at the forefront of the U.K.’s vibrant IT sector.
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PagerDuty is a digital operations management platform used across various sectors, providing enhanced visibility and solutions for incident management and system monitoring. With over 700 integrations available, PagerDuty supports efficient digital operations for globally recognized brands like Zoom, DoorDash and Peloton. The company operates offices all over the word, including one in London.
PagerDuty Is Hiring | View Open Jobs
Smartly, trusted by brands like Uber and eBay, is an AI-powered marketing technology company specializing in social media advertising. Through its platform, Smartly automates campaign management and creative production, leveraging AI and data to optimize advertising strategies across various channels. The company has locations all over the U.S. and Europe, including an office in London.

Smartly Is Hiring | View Open Jobs
Lansweeper is an IT company helping clients manage and protect their network assets and internet devices. Through its platform, users can inventory their devices and store a wide range of data like individual IP addresses and model numbers. The company also inventories its software frequently to ensure it complies with company standards.
Lansweeper Is Hiring | View Open Roles
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LeanIX makes SaaS products for enterprise architecture management. Its offerings allow client companies to integrate and manage every aspect of their IT and business process structures, from merging legacy and modern software to integrating products from various vendors. LeanIX offers a single view of the truth, enabling businesses to leverage automations and manage important processes.
LeanIX Is Hiring | View Open Jobs
Recognized by Fortune as the world’s most-admired IT company, Accenture is a global leader in a wide range of digital services, as well as tech consulting. The Dublin-based firm’s expertise includes cloud services, cybersecurity and software development, helping businesses across more than 120 countries improve their operations and technology. With a global headcount of more than 700,000 people, Accenture is the largest employer on this list, with more than a dozen offices throughout the UK and Ireland. 
Accenture is Hiring | View Open Jobs
Founded in 1911, IBM is one of the oldest and largest tech companies in the world, providing infrastructure, software and IT consulting services to companies of all sizes. It started out manufacturing technology like tabulating equipment and clock card machines, and is now best known for its computers, servers, data storage systems and networking equipment — as well as innovations in emerging tech like quantum computing and artificial general intelligence. While it is headquartered in New York, IBM has 125 offices throughout the UK, employing more than 20,000 people.
IBM is Hiring | View Open Jobs
Videoconferencing giant Zoom has largely cornered the remote work and education sectors since the Covid-19 pandemic. Beyond its eponymous virtual meeting feature, the company also offers an appointment scheduling tool, chat functionality and an online whiteboard for sharing notes — not to mention an AI assistant that can help users draft emails, summarize meetings and brainstorm. The California-based company has been growing its presence in the UK over the last several years, and opened a large new “engagement hub” in London in 2023 for its 200 employees here.
Zoom is Hiring | View Open Jobs
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BJSS is Leeds-based IT and engineering consulting firm that mainly works with clients in the energy and utilities, financial services, health and retail industries, helping them to implement cloud infrastructure, AI, automation and data in new ways. The company has won several awards over the years, including the Queen’s Award for Enterprise, one of the world’s most distinguished business awards that celebrates UK enterprises. BJSS has dozens of offices throughout the UK, as well as locations across the United States, Europe and Australia. 
BJSS is Hiring | View Open Jobs
Data productivity company Matillion enables companies to pull data from various sources on the cloud, store it in their own data warehouses and process it into actionable insights using the extract, load, transform (ETL) method. Its platform also incorporates generative AI, allowing users to query their data in plain language and automatically create documentation on their data. Thousands of enterprises, including Cisco, Slack and DocuSign, use Matillion to move, transform and automate their data. The company is dual-headquartered in both Colorado and Manchester, where it has a headcount of about 300 people.
Matillion is Hiring | View Open Jobs
Abel Rodriguez and Sara B.T. Thiel contributed reporting to this story.


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