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Top Tech Companies in Belfast (535)

Thales
Artificial Intelligence • Big Data • Information Technology • Security • Software
78 Offices
63,258 Employees
18 Benefits Hiring Now

Thales is a global high technology leader investing in digital and “deep tech” innovations – connectivity, big data, artificial intelligence, cybersecurity and quantum technology – to build a future we can all trust, which is vital to the development of our societies. The company provides solutions, services and products that help its customers – businesses, organisations and states – in...

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Thales

Thales's Top Stability & Growth Strengths

Strong Revenue Growth: Sales increased in 2025 versus 2024, with early 2026 also showing higher sales and management guiding to further organic growth in 2026.

Profitability: Adjusted EBIT rose and margins improved in 2025, indicating strengthening operating performance alongside growth.

Resilient & Sustainable Growth: Record order intake and an order book above €53 billion provide multi‑year visibility, and a book‑to‑bill above 1 with reaffirmed 2026 targets supports continued expansion.

Thompsons Solicitors
Professional Services
18 Offices
800 Employees
Hiring Now

Thompsons Solicitors is a prominent UK law firm established in 1921, specializing in personal injury, employment rights, and trade union law. With 18 offices across the UK, the firm exclusively represents injured or mistreated individuals and trade union members, never acting for employers or insurance companies. They are dedicated to social justice, campaigning for legal reforms, and securing compensation for...

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Thompsons Solicitors
System C Healthcare
Edtech • Healthtech • Information Technology • Software
9 Offices
917 Employees
Hiring Now

System C Healthcare is a British health and social care technology company founded in 1983. It develops and deploys IT products and services for the NHS, social service authorities and social care providers. Through its Liquidlogic subsidiary, the company supplies social care and education management solutions that facilitate collaboration across health and care services. Its mission is to deliver technology...

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System C Healthcare
Harness
Artificial Intelligence • Cloud • Software
8 Offices
900 Employees
25 Benefits Hiring Now
Harness is the AI-native software delivery platform company.

Harness is a leader in AI-native software delivery, dedicated to empowering developers and engineering teams worldwide. We revolutionize how software is built, tested, deployed, and optimized by driving efficiency, reliability, and speed throughout the software development lifecycle. At Harness, we envision a world where developers focus on innovation, free from repetitive tasks, supported by tools that streamline every step. Our platform...

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Harness

Harness's Top Stability & Growth Strengths

Strong Market Position & Advantage: Analyst reports in 2025 place Harness as a Leader in Gartner’s Magic Quadrant and Forrester’s Wave for DevOps Platforms, signaling top-tier standing among end-to-end platforms. Coverage also highlights expansion beyond CD into feature flags, security/test orchestration, cloud cost, and IDP.

Strong Revenue Growth: Public statements note crossing $100M ARR in 2023/2024 and being on track to exceed $250M ARR in 2025, indicating robust momentum. Reported year-over-year growth into that period is characterized as strong and accelerating.

Investor Backing & Capital Strength: Funding events include a $240M Series E at a $5.5B valuation in December 2025 and a $150M credit facility in 2024, providing material capital for expansion. The valuation step-up and new capital are cited as signals of investor confidence.

David Lloyd Clubs
Fitness • Sports
96 Offices
11,500 Employees
Hiring Now

David Lloyd Clubs operates premium health and wellness clubs across the UK and mainland Europe. Its facilities include gyms, swimming pools, tennis and other racquet sports, group exercise studios, spas, family activities, children’s areas and Clubrooms. The company provides memberships designed to support fitness, recreation, relaxation and family time, serving more than 800,000 members through 149 clubs and employing over...

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David Lloyd Clubs
See.Sense
Artificial Intelligence • Software
Newtownards
17 Employees

See.Sense is on a mission to make cycling better - by making it safer, more convenient and even more enjoyable. See.Sense uses patented sensor technology and AI to improve the safety and experience of the rider and empower cities with powerful data insights that lead to actionable outcomes. Our award-winning intelligent and connected bike lights and GPS bike trackers gather deep...

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See.Sense
clearpool.io
Marketing Tech • Financial Services
2 Offices

Pioneers in Capital Markets and veteran innovators harking from Wall Street and the City, we’re building the world’s first truly tokenised Multilateral Trading Facility — bringing a world-first digitised institutional-grade exchange, with no venue-driven custodial risk, under FCA authorisation and into the European markets. Designed and built by a concentration of global exchange technology experts, with decades of experience to the...

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clearpool.io
PwC Greece
Artificial Intelligence • Professional Services • Business Intelligence • Consulting • Cybersecurity • Generative AI
80 Offices
2,108 Employees
2 Benefits

At PwC our purpose is to build trust in society and solve important problems. We’re a network of firms in 155 countries with over 327,000 people who are committed to delivering quality in assurance, advisory and tax services. Find out more and tell us what matters to you by visiting us at www.pwc.com.

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PwC Greece
Eliassen Group
Professional Services • Consulting
26 Offices
1,152 Employees
18 Benefits

Eliassen Group is a leading strategic consulting company that provides business, clinical, and IT services for our clients as they seek to transform and execute strategies that will drive exceptional outcomes. Leveraging over 30 years of success, we focus on clinical solutions, professional services, and talent solutions. Eliassen Group positively impacts the lives of our employees, clients, consultants, and the...

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Eliassen Group

Eliassen Group's Top Stability & Growth Strengths

Market Expansion: Acquisitions such as VIA Technical, SafeNet Consulting, and The Evanston Group broaden geographic reach and deepen technology and life sciences capabilities. Maintaining a national office footprint and adding presence in key regions signal deliberate growth in addressable markets.

Strong Brand Reputation: Industry accolades like repeated U.S. Best Managed Company honors and ClearlyRated Best of Staffing Diamond awards highlight sustained external validation of quality and performance. Recognition by sector publications and lists reinforces credibility within staffing and consulting niches.

Future-Ready Strategy: Emphasis on digital transformation, AI data services, cybersecurity, and cloud infrastructure points to proactive positioning for evolving client needs. Partnerships and platform integrations, including operational systems consolidation, are positioned to support scale and innovation.

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GWI
Other
6 Offices
679 Employees
30 Benefits

We’re the target audience company that does things a bit differently. Our job is to cut through the noise and give you facts you can trust. Our flagship study represents more than 2 billion people around the world, and it tells you how consumers are changing; their actions, ideals, perceptions, feelings... (you get the gist). The world’s largest (and smallest)...

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GWI
Lightspeed Commerce
Cloud • eCommerce • Payments • Sales • Software
19 Offices
2,174 Employees
29 Benefits

Powering the businesses that are the backbone of the global economy, Lightspeed’s one-stop commerce platform helps merchants innovate to simplify, scale and provide exceptional customer experiences. The cloud solution transforms and unifies online and physical operations, multichannel sales, expansion to new locations, global payments, financing and connection to supplier networks. Founded in Montréal, Canada in 2005, Lightspeed is dual-listed on the...

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Lightspeed Commerce
O2
Information Technology • Mobile
21 Offices
5,230 Employees
15 Benefits

O2 is the commercial brand of Telefónica UK Limited and is a leading digital communications company with the highest customer satisfaction for any mobile provider according to Ofcom. With over 23 million customers, O2 runs 2G, 3G, 4G and 5G networks across the UK, as well as operating O2 Wifi and owning half of Tesco Mobile. O2 has over 450...

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O2
Magellan Aerospace
Aerospace • Manufacturing
17 Offices
1,800 Employees
25 Benefits

Magellan has more than 90 years of collective knowledge and experience in the aerospace industry. The organization officially adopted the name Magellan Aerospace Corporation in 1996; deriving it from the intrepid explorer Ferdinand Magellan. His global exploits at the turn of the 15th century established a number of firsts. Magellan’s vision was to carry this same legacy into the future...

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Magellan Aerospace
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.

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Interface
SustainIQ
Software • Business Intelligence
Belfast
25 Employees

SustainIQ is the all-in-one sustainability and ESG reporting software that measures, monitors, and reports on the social, economic, and environmental performance of businesses. We save sustainability professionals from wasting time chasing teams, sites, and regions for reporting information. No more unreadable spreadsheets, awkward (and incorrect) calculations and endless report building. With SustainIQ, simply pull, input or bulk upload data and...

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SustainIQ
Sixteen South
News + Entertainment
Belfast
23 Employees

We make television for every child in every home in every country around the world. We're a group of three companies which creates, produces and distributes our work. We create shows without creative boundaries - whether that's 2D, 3D, live action or puppetry. We passionately believe in more.

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Sixteen South
Nutbourne
Information Technology
Belfast
28 Employees

As a managed services provider in London, Nutbourne was founded to support people and solve their problems, offering a service that can cover all of your business’ needs from one source. That’s why our team assist people and their systems, as well providing high level consultancy, that we monitor consistently and improve when needed. We take on your IT burden,...

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Nutbourne
3DEO (3deo.com)
Information Technology • Big Data Analytics
Belfast
18 Employees

We unlock the power of your data with rapid and customisable solutions, to inform and empower your strategic decisions. We are the experts in combining 3D visualisation, earth observation and big data analytics. At 3DEO, we know it is time-consuming and costly for your organisation to respond to critical situations with the right solution. Our cost-effective and customisable solutions provide...

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3DEO (3deo.com)
Re-Vana Therapeutics
Software • Biotech
Belfast
19 Employees

Re-Vana Therapeutics is a venture-backed, pioneering therapeutics and ocular drug delivery company developing innovative sustained-release biologics to treat serious retinal diseases. The company’s proprietary photo-crosslinked, biodegradable platform technologies, EyeLief®, EyeLief SD™ and OcuLief®, enable custom delivery of a wide range of therapeutic molecules. Numerous platform capabilities create a therapeutic continuum to expand treatment opportunities through both internal development and external,...

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Re-Vana Therapeutics
Happiest Minds Technologies
Cloud • Information Technology
19 Offices
5,313 Employees
7 Benefits

Happiest Minds Technologies Limited (NSE: HAPPSTMNDS), a Mindful IT Company, enables digital transformation for enterprises and technology providers by delivering seamless customer experiences, business efficiency and actionable insights. We do this by leveraging a spectrum of disruptive technologies such as: artificial intelligence, blockchain, cloud, digital process automation, internet of things, robotics/drones, security, virtual/augmented reality, etc. Positioned as ‘Born Digital ....

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Happiest Minds Technologies

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