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Top IT Companies in Belfast (120)

GTT
Information Technology • Security • Design
33 Offices
3,031 Employees
29 Benefits

GTT is a managed network and security services provider to global organizations. We design and deliver solutions that leverage advanced cloud, networking and security technologies. We complement our solutions with a suite of professional services and exceptional support teams in local markets around the world. We serve thousands of national and multinational companies with a portfolio that includes SD-WAN, security,...

GTT

GTT's Top Stability & Growth Strengths

Strong Revenue Growth: Consolidated revenues and EBITDA at Gaztransport & Technigaz increased markedly in 2023–2024 with further growth guided for 2025. A sizable multi‑year order book and recent LNG carrier awards provide strong visibility.

Strong Market Position & Advantage: GTT Communications operates a Tier‑1 global IP backbone across continents and is recognized as a Leader in managed network services by ISG and industry programs. A broad enterprise customer base and continued awards reinforce standing in its specialized domains.

Future-Ready Strategy: Both organizations are investing in forward‑looking capabilities, including hydrogen and alternative fuels (GTT S.A.) and SASE/SD‑WAN platforms plus 400G/800G backbone upgrades (GTT Communications). These initiatives position them to address evolving demand and regulatory drivers.

Allstate Northern Ireland
Information Technology • Software
2 Offices

Allstate in Northern Ireland is a leading technology and business services centre, supporting The Allstate Corporation - one of the largest publicly held personal lines insurers in the United States. Established as one of Northern Ireland’s most progressive employers, Allstate NI continues to drive innovation across emerging technologies that shape the future of how people live and work. Our teams are developing...

Allstate Northern Ireland
First Advantage
Information Technology
2 Offices
3,712 Employees
28 Benefits

First Advantage delivers comprehensive background check solutions and insights that enable employers and housing providers to make confident choices, reduce risk, and maintain compliance. With offices in 26 locations and a staff of 4,000+ employees, First Advantage leverages leading technology and the industry’s largest global capabilities to complete background checks in 200+ countries and territories. If you’re looking for employee...

First Advantage

First Advantage's Top Stability & Growth Strengths

Strong Market Position & Advantage: First Advantage is positioned as a top-tier provider in background screening following the Sterling Check acquisition, creating a combined business with substantial scale and broad product capabilities. The company’s global footprint and deep enterprise penetration support competitiveness for large, compliance-sensitive programs.

Strong Revenue Growth: Revenue expanded materially from 2024 to 2025, reflecting the step-change from the Sterling acquisition alongside cited commercial momentum. Forward guidance for 2026 indicates continued year-over-year top-line growth off the larger base.

Customer Loyalty & Retention: Customer retention is described as strong, with retention in the mid-to-high range and notable growth attributed to upsell, cross-sell, and new logos. This suggests a relatively sticky customer base supporting resilience through varying hiring cycles.

Cirdan
Information Technology • Manufacturing
2 Offices
94 Employees

Cirdan designs, manufactures and supplies innovative software and imaging solutions for the acceleration and enhancement of diagnosis. Our systems are optimised for pathology and clinical laboratory usage. Cirdan’s primary product is its world-class Laboratory Information System, ULTRA. ULTRA has been designed to streamline laboratory operations and is currently installed in more than 72 laboratories across 6 continents. Another core product...

Cirdan
ScreenCloud
Artificial Intelligence • Cloud • Hardware • Information Technology • Software
5 Offices
130 Employees
107 Benefits
Creating connected companies with screens that communicate!

ScreenCloud is a full-stack digital signage solution that provides hardware and software to run screens at scale, improving deployment, management and security. Get mission critical communication infront of the right people, from HQ to deskless and frontline teams.

ScreenCloud
Sinch
Big Data • Cloud • Information Technology • Marketing Tech • Mobile
4 Offices
1,520 Employees
27 Benefits

Sinch brings businesses and people closer with tools enabling personal engagement. Our leading cloud communications platform lets businesses reach every mobile phone on the planet, in seconds or less, through mobile messaging, voice, and video. Our global headquarters are in Stockholm, Sweden, and we have a local presence in more than 30 countries - probably somewhere near you!

Sinch
Ensono
Cloud • Information Technology
12 Offices
3,000 Employees
14 Benefits Hiring Now
Support mission critical workloads, modernize IT infrastructure and reduce total cost of ownership.

Ensono helps IT leaders be the catalyst for change by harnessing the power of hybrid IT to transform their businesses. Our broad services portfolio from mainframe to cloud, powered by an intelligent governance platform, is designed to help our clients operate for today and optimize for tomorrow. We are award-winning certified experts in AWS & Azure

Ensono

Ensono's Top Stability & Growth Strengths

Strong Revenue Growth: Company disclosures indicate revenue expanded from about $224M at inception to roughly $1.1B and clients grew to 250+ by January 2026, reflecting sustained scale-up. Additional signals such as headcount increases and the launch of an AI & Innovation Division reinforce ongoing momentum.

Strong Market Position & Advantage: Multiple independent analyst assessments (ISG, Everest, IDC) place the company as a Leader in mainframe services and modernization, with Gartner listing it in a 2024 Market Guide for the niche. Credentials like the AWS Mainframe Modernization Competency and public-sector recognitions further underpin competitive strength in this segment.

Investor Backing & Capital Strength: Ownership by KKR since 2021 and a stated $250M, five‑year AI investment plan indicate access to capital supporting expansion and R&D. Capability-expanding acquisitions such as Amido and ExperSolve align with a funded growth strategy.

Interface
Information Technology • Software
17 Offices
4 Employees
36 Benefits

Interface is a frontier research lab focused on high-fidelity human and object simulation. We build systems that model appearance, behavior, and interaction for world-model research. Founded by MIT graduates and backed by Y Combinator, we’re a deep-tech company in graphics, machine learning, and simulation.

Interface
Electrosonic
Digital Media • Information Technology • Design
12 Offices
496 Employees
22 Benefits

Electrosonic designs, builds and supports innovative technology solutions that create lasting experiences where people live, work and play. Electrosonic is an international audiovisual company with a strong reputation for working on complex projects, both large and small, and has through its over 55 year history developed lasting partnerships with customers and suppliers. Electrosonic brings a unique breadth of experience to each...

Electrosonic
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Decora Blind Systems
Information Technology • Industrial • Manufacturing
Lisburn
182 Employees

Decora’s success has been the result of collaboration between teams and individuals from across the business. From Production and Warehousing to Engineering, Marketing, Design and Finance, teamwork across departments retain one prime focus of providing our customer with a quality, innovative product and service. Decora’s calibre and 40 years history are best described through the product portfolio. The innovative design...

Decora Blind Systems
Cybit
Information Technology
4 Offices
156 Employees
2 Benefits

Cybit is an end-to-end IT solutions provider with 30+ years of experience. We transform businesses using industry-leading technologies. Our mission is to power our customers’ commercial success through the expert design, development and delivery of flexible managed IT services, cyber security solutions, cloud migration and data and analytics. Email us at [email protected]

Cybit
Crossvale
Information Technology • Consulting
2 Offices
68 Employees
13 Benefits

We are an IT services company that provides solutions to companies of every size - from small companies to some of the largest global enterprises. Our specialties are: - Digital Transformation - Enterprise Architecture - RedHat OpenShift (PaaS) - RedHat OpenStack (IaaS) - Business Process Management - Service Oriented Architecture (SOA) - Integration - Cloud, Hybrid and On-Prem solutions - MEAN Stack (Mongo, Express, Angular Node) We have operations in USA,...

Crossvale
Zego (zego.com)
Automotive • Information Technology • Insurance
2 Offices
388 Employees
30 Benefits

Zego is a commercial motor insurance provider that powers opportunities for businesses, from entire fleets of vehicles to self-employed drivers and riders. It combines best-in-class technology with sophisticated data sources to offer insurance products that save businesses time and money. Since its inception, Zego has believed that the problem with traditional insurance is that it holds businesses back. It’s too...

Zego (zego.com)
Fujitsu
Cloud • Hardware • Information Technology • Mobile • Software
57 Offices
64,723 Employees
27 Benefits

Fujitsu is the leading Japanese global information and communication technology company, offering a wide range of technology products, solutions and services. We build new possibilities by connecting people, technology and ideas, creating a more sustainable world where anyone can advance their dreams.

Fujitsu
SciLeads
Information Technology • Marketing Tech • Sales • Consulting
2 Offices
79 Employees

SciLeads is an innovative sales and marketing intelligence platform for scientific companies. We enable greater sales by providing companies with instant access to highly relevant prospect and market information.

SciLeads
Exclaimer
Information Technology • Consulting
6 Offices
268 Employees
23 Benefits

Turbo-boost your email signatures After starting Exclaimer over 20 years ago, we saw how our email signature management software could boost the way businesses manage employee email signatures. Today we help brands keep communications consistent and make every message count – all while being legally compliant. But our software doesn’t just help things run smoothly, it lets businesses cut admin overheads...

Exclaimer
Budibase
Information Technology • Software
Belfast
22 Employees

Build internal tools for your business in minutes

Budibase
Aspire Technology Solutions
Cloud • Information Technology • Cybersecurity
3 Offices
257 Employees

Welcome to Aspire Technology Solutions! We are an award-winning IT Managed Service and Cyber Security Provider. We deliver leading technology solutions across cyber security, cloud, connectivity, managed services and unified communications to help our customers drive real business benefits. Our mission is to deliver technology like no other; we are dedicated to putting technology to work to help our customers innovate,...

Aspire Technology Solutions
CI&T
Information Technology • Consulting
22 Offices
6,474 Employees
28 Benefits

CI&T is your end-to-end digital transformation partner. As a digital native, we bring a 27-year track record of accelerating business impact through complete and scalable digital solutions. With a global presence of 6,000+ professionals in strategy, research, data science, design and engineering, we unlock top-line growth, improve customer experience and drive operational efficiency.

CI&T
Mzuri Group
Information Technology • Industrial • Manufacturing
Lisburn
5,000 Employees

Mzuri Group is a global luxury window coverings group established with the vision to provide an environment where companies can achieve their true potential. Founded by a leadership team with more than 40 years of success in the window coverings market, the spirit of the group is to assemble the best of the best. Sharing a vision, ideas, experience, resources...

Mzuri Group

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