Top 20 JavaScript Development Companies in Northern Ireland
The Best of December 2025Looking for a top JavaScript developer in Northern Ireland?
If you're hiring a JavaScript developer to help you build or update a website that's responsive and interactive, consider the pros and cons of JavaScript as a programming language. Advantages include its speed because it's executed on the client-side; reduction in server load; and diverse functionality. Disadvantages to consider include security such as bugs on the client-side.
To assist you in your search for a partner, we’ve compiled this list of the top JavaScript development agencies in Northern Ireland. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best Northern Ireland JavaScript Developers
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1$50,000+50 - 249 employeesLurgan, Northern IrelandGCD, a software development company, was launched in 1999. The midsize team offers Custom Software Development, Mobile App Development, Web Development, UX/UI Design, and more. The company is headquartered in Lurgan, Northern Ireland and Dublin 2, Ireland.Read More
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2$1,000+2 - 9 employeesNewcastle, Northern IrelandRead More
Fat Fish Marketing is a SEO services firm based in Banbridge, United Kingdom. The small team offers search engine optimization, web development, and pay per click and was launched in 2016.
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PlantXIndustries
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3$10,000+10 - 49 employeesBelfast, Northern IrelandRead More
Web Bureau is a web agency headquartered in Belfast, United Kingdom, with an office in Dublin, Ireland. Since 2005, the company has specialized in web development, pay-per-click, and web design solutions for small and midmarket businesses. They also offer SEO services, focusing on mobile optimization, on-site optimization, and local search, among other methods.
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Harry CorryIndustries
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4$1,000+2 - 9 employeesBelfast, Northern IrelandWeb design company Amigo Studios is headquartered in Doagh, United Kingdom. The small team specializes in web design, web development, social media marketing, search engine optimization, and more and was launched in 2013.Read More
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5$1,000+2 - 9 employeesDownpatrick, Northern IrelandTriggerAppy Ltd is a Downpatrick, Northern Ireland-based custom software development company. The small team focuses on Custom Software Development, Web Development, Mobile App Development, and Other Application Development. The firm was launched in 2012.Read More
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6$25,000+2 - 9 employeesBelfast, Northern IrelandNigma Software is a software development company established in 2020. The small Belfast, Northern Ireland-based team offers Custom Software Development, Web Development, Mobile App Development, Artificial Intelligence, and more.Read More
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7$1,000+10 - 49 employeesBelfast, Northern IrelandRead More
The House Of Code is a mobile app development company. Established in 2019, the small agency is located in Belfast, United Kingdom and Kraków, Poland. Their services include mobile app development, custom software development, web development, and other IT consulting and SI.
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8$5,000+2 - 9 employeesBelfast, Northern IrelandElement Seven is a web design company. The Belfast, Northern Ireland-based team focuses on Web Design and Web Development.Read More
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9$5,000+10 - 49 employeesBelfast, Northern IrelandENGEN, a web design company, was founded in 2018. The team offers Web Design and Web Development.Read More
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10$10,000+10 - 49 employeesBelfast, Northern IrelandDawson Andrews is an user experience agency. Based in Belfast, Northern Ireland and Sydney, Australia, their small team focuses on UX/UI Design and Product Design. The agency was founded in 2015.Read More
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Niice.coIndustries
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11$1,000+2 - 9 employeesBelfast, Northern IrelandWebsite development company React Digitally was established in 2016. The team provides Web Development and Search Engine Optimization and is headquartered in Belfast, Northern Ireland.Read More
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12$5,000+2 - 9 employeesBelfast, Northern IrelandRead More
Erised, a web development firm, was launched in 2021. The small team focuses on web development, custom software development, mobile app development, and e-commerce development. The firm is based in Leeds, United Kingdom.
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13$1,000+2 - 9 employeesPortadown, Northern IrelandWeb development firm Cornell Studios Ltd is headquartered in Portadown, Northern Ireland. Their services include Web Development and Search Engine Optimization.Read More
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14$10,000+10 - 49 employeesBelfast, Northern IrelandRead More
Zesty is a full-service digital agency based in Dublin, Ireland, with additional offices in Belfast, Northern Ireland and London, England. Zesty was founded in 1996 and has 37 employees. Services offered by Zesty include web development, web design, and digital strategy.
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Ulster OrchestraIndustries
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15Undisclosed10 - 49 employeesBelfast, Northern IrelandBetley Whitehorne Image, a branding agency, is in Belfast, Northern Ireland. The team focuses on Branding and Web Development.Read More
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16$5,000+10 - 49 employeesNewcastle, Northern IrelandRead More
Adeo Group is a web design and development agency based in Glasgow, U.K., with additional offices in London, and Dubai. Founded in 2004, they have around 15 employees and they offer web design, web development, and e-commerce development to, almost exclusively, small businesses.
Clients
Eden MillIndustries
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17$5,000+50 - 249 employeesNewry, Northern Ireland3rd Digital is a small Ahmedabad, India-based mobile application development company. Founded in 2017, the team specializes in mobile app development, web development, custom software development, ux/ui design, and more.Read More
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18$5,000+Freelancer employeesBelfast, Northern IrelandBased in Belfast, Northern Ireland, CausewaySoft LTD is a small web development company. The team provides Web Development and Mobile App Development.Read More
Industries
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