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        64 API jobs in Belfast + 5 miles

        Data Engineer

        PA Consulting
        Belfast, County Antrim
        £ Not Disclosed
        Company description - We believe in the power of ingenuity to build a positive human future. As strategies, technologies, and innovation collide, we create opportunity from complexity. Our teams of interdisciplinary experts combine innovative thinking and breakthrough technologies to progress further, faster. Our clients adapt and transform, and together we achieve enduring results. We are over 4,000 strategists, innovators, designers, consultants, digital experts, scientists, engineers, and technologists. And we have deep expertise in consumer and manufacturing, defence and security, energy and utilities, financial services, government and public services, health and life sciences, and transport. Our teams operate globally from offices across the UK, Ireland, US, Nordics, and Netherlands. Bringing Ingenuity to Life. Job description
        Company description - We believe in the power of ingenuity to build a positive human future. As strategies, technologies, and innovation collide, we create opportunity from complexity. Our teams of interdisciplinary experts combine innovative thinking and breakthrough technologies to progress further, faster. Our clients adapt and transform, and together we achieve enduring results. We are over 4,000 strategists, innovators, designers, consultants, digital experts, scientists, engineers, and technologists. And we have deep expertise in consumer and manufacturing, defence and security, energy and utilities, financial services, government and public services, health and life sciences, and transport. Our teams operate globally from offices across the UK, Ireland, US, Nordics, and Netherlands. Bringing Ingenuity to Life. Job description
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        Data Engineer

        PA Consulting
        Belfast, County Antrim
        £ Not Disclosed
        Company description - We believe in the power of ingenuity to build a positive human future. As strategies, technologies, and innovation collide, we create opportunity from complexity. Our teams of interdisciplinary experts combine innovative thinking and breakthrough technologies to progress further, faster. Our clients adapt and transform, and together we achieve enduring results. We are over 4,000 strategists, innovators, designers, consultants, digital experts, scientists, engineers, and technologists. And we have deep expertise in consumer and manufacturing, defence and security, energy and utilities, financial services, government and public services, health and life sciences, and transport. Our teams operate globally from offices across the UK, Ireland, US, Nordics, and Netherlands. Bringing Ingenuity to Life. Job description
        Company description - We believe in the power of ingenuity to build a positive human future. As strategies, technologies, and innovation collide, we create opportunity from complexity. Our teams of interdisciplinary experts combine innovative thinking and breakthrough technologies to progress further, faster. Our clients adapt and transform, and together we achieve enduring results. We are over 4,000 strategists, innovators, designers, consultants, digital experts, scientists, engineers, and technologists. And we have deep expertise in consumer and manufacturing, defence and security, energy and utilities, financial services, government and public services, health and life sciences, and transport. Our teams operate globally from offices across the UK, Ireland, US, Nordics, and Netherlands. Bringing Ingenuity to Life. Job description
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        Job Title: Digital Senior Consultant - Location: Belfast, Hybrid - OutForm Consulting is a dynamic consulting team focused on delivering business - performance improvements, sustainable results, and creating an environment for our team and our clients to Thrive. We are passionate about building long-lasting relationships with our clients and our team. As a Digital Senior Consultant, you will lead digital consulting engagements for our clients, contributing to the development of client relationships and shaping the future direction of OutForm. * Lead business improvement consulting engagements for clients. * Shape and implement complex business change and transformational programs. * Effectively lead and manage sub-workstreams and collaborate with senior stakeholders. * Contribute to business development activities, supporting referrals and new business opportunities.
        Job Title: Digital Senior Consultant - Location: Belfast, Hybrid - OutForm Consulting is a dynamic consulting team focused on delivering business - performance improvements, sustainable results, and creating an environment for our team and our clients to Thrive. We are passionate about building long-lasting relationships with our clients and our team. As a Digital Senior Consultant, you will lead digital consulting engagements for our clients, contributing to the development of client relationships and shaping the future direction of OutForm. * Lead business improvement consulting engagements for clients. * Shape and implement complex business change and transformational programs. * Effectively lead and manage sub-workstreams and collaborate with senior stakeholders. * Contribute to business development activities, supporting referrals and new business opportunities.
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        We are seeking an experienced Senior Software Engineer to join a high-performing engineering team working on large-scale, cloud-based services that power products used by millions worldwide. This role is focused on building and maintaining modern backend services and APIs, ensuring they are reliable, scalable, and performant. You'll work closely with talented engineers and product managers to deliver new features, improve existing systems, and solve complex technical challenges. The environment is fast-paced but collaborative, with a strong emphasis on quality, innovation, and ownership. If you thrive in tackling challenging problems, are passionate about building high-quality software, and want the flexibility of fully remote working while contributing to impactful projects, this role offers a fantastic opportunity.
        We are seeking an experienced Senior Software Engineer to join a high-performing engineering team working on large-scale, cloud-based services that power products used by millions worldwide. This role is focused on building and maintaining modern backend services and APIs, ensuring they are reliable, scalable, and performant. You'll work closely with talented engineers and product managers to deliver new features, improve existing systems, and solve complex technical challenges. The environment is fast-paced but collaborative, with a strong emphasis on quality, innovation, and ownership. If you thrive in tackling challenging problems, are passionate about building high-quality software, and want the flexibility of fully remote working while contributing to impactful projects, this role offers a fantastic opportunity.
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        Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
        Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
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        Senior Java Engineer

        Ocho
        Belfast, County Antrim
        £80,000 - £120,000 per annum
        Software Engineer - Java | Cloud Security | Are you a Java backend engineer looking to build cutting-edge cloud security solutions trusted by global organisations like NASA? This is your chance to work with a fast-growing company in the Cloud Native Application Protection Platform (CNAPP) space, delivering real-time insights to secure complex cloud infrastructure. What's in it for you? * Salary: £80-120k * Hybrid working: 3 days per week in the office * Tech stack: Java (primary language), Spring Boot, AWS * Work on mission-critical cloud security products trusted by NASA * Solve high-scale backend engineering challenges in a modern, cloud-native environment * Join a highly skilled team working on meaningful, impactful projects - The Role * Take ownership of the full development lifecycle: design, development, deployment and monitoring
        Software Engineer - Java | Cloud Security | Are you a Java backend engineer looking to build cutting-edge cloud security solutions trusted by global organisations like NASA? This is your chance to work with a fast-growing company in the Cloud Native Application Protection Platform (CNAPP) space, delivering real-time insights to secure complex cloud infrastructure. What's in it for you? * Salary: £80-120k * Hybrid working: 3 days per week in the office * Tech stack: Java (primary language), Spring Boot, AWS * Work on mission-critical cloud security products trusted by NASA * Solve high-scale backend engineering challenges in a modern, cloud-native environment * Join a highly skilled team working on meaningful, impactful projects - The Role * Take ownership of the full development lifecycle: design, development, deployment and monitoring
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        (Please note candidates should reside in NI) * Salary: £70,000 - £90,000 base + 10% bonus - Join a global digital content and technology business with millions of daily users and a large-scale platform delivering high-volume content to web, mobile, and partner services. The company is investing heavily in its engineering teams to enhance its delivery capabilities, building out scalable infrastructure, and driving innovation across its platforms. You'll join our clients Platform team - As a Senior Backend Software Engineer, you'll design and build world-class services and APIs that are reliable, scalable, and performant. You'll be working closely with engineers and product teams to improve existing technologies and create brand-new applications, while mentoring junior developers and contributing to engineering best practices.
        (Please note candidates should reside in NI) * Salary: £70,000 - £90,000 base + 10% bonus - Join a global digital content and technology business with millions of daily users and a large-scale platform delivering high-volume content to web, mobile, and partner services. The company is investing heavily in its engineering teams to enhance its delivery capabilities, building out scalable infrastructure, and driving innovation across its platforms. You'll join our clients Platform team - As a Senior Backend Software Engineer, you'll design and build world-class services and APIs that are reliable, scalable, and performant. You'll be working closely with engineers and product teams to improve existing technologies and create brand-new applications, while mentoring junior developers and contributing to engineering best practices.
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        Senior .Net Developer

        MCS Group
        Belfast, County Antrim
        £55,000 - £65,000 per annum
        MCS Group is partnering with a fast-growing, forward-thinking Insurtech business as they expand their software development team. We're looking for an accomplished Senior .Net Developer to take a key role in delivering high-quality, secure, and scalable features across an expanding range of Insurtech products and applications. Joining a close-knit technology team, the Senior Developer will work closely with the Software Engineering Manager and Principal Software Engineers, helping to shape distributed systems, mentor more junior .Net developers, and champion engineering excellence throughout the development lifecycle. You'll collaborate across product, design, and wider engineering teams to turn requirements into robust, elegant solutions that make a measurable impact. With fresh investment and several new products on the horizon, it's an excellent opportunity for a ..
        MCS Group is partnering with a fast-growing, forward-thinking Insurtech business as they expand their software development team. We're looking for an accomplished Senior .Net Developer to take a key role in delivering high-quality, secure, and scalable features across an expanding range of Insurtech products and applications. Joining a close-knit technology team, the Senior Developer will work closely with the Software Engineering Manager and Principal Software Engineers, helping to shape distributed systems, mentor more junior .Net developers, and champion engineering excellence throughout the development lifecycle. You'll collaborate across product, design, and wider engineering teams to turn requirements into robust, elegant solutions that make a measurable impact. With fresh investment and several new products on the horizon, it's an excellent opportunity for a ..
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        Software Developer

        MCS Group
        Belfast, County Antrim
        £30,000 - £55,000 per annum
        MCS Group is delighted to be exclusively partnering once again with a well-established, growing tech company in Belfast. After successfully placing their last two hires, we're excited to bring another fantastic opportunity to market-this time for a Software Developer looking to take the next step in their career. This company combines innovation with purpose, creating solutions that genuinely make a difference in people's lives. As they continue to grow, they're now seeking a motivated developer who's keen to work across both frontend and backend technologies and become part of a growing team. The Role - You'll join a cross-functional product team working in an agile environment where you'll contribute to the development and enhancement of meaningful applications. From day one, you'll be writing clean, maintainable code, taking part in code reviews, solving real-world
        MCS Group is delighted to be exclusively partnering once again with a well-established, growing tech company in Belfast. After successfully placing their last two hires, we're excited to bring another fantastic opportunity to market-this time for a Software Developer looking to take the next step in their career. This company combines innovation with purpose, creating solutions that genuinely make a difference in people's lives. As they continue to grow, they're now seeking a motivated developer who's keen to work across both frontend and backend technologies and become part of a growing team. The Role - You'll join a cross-functional product team working in an agile environment where you'll contribute to the development and enhancement of meaningful applications. From day one, you'll be writing clean, maintainable code, taking part in code reviews, solving real-world
        more
        Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
        Senior Java Engineer - Belfast (Hybrid) Up to £80,000 + Exceptional Benefits | Backend Java | Global Impact | Flexible Working - MCS are delighted to be partnering with a forward-thinking global tech leader. This company is hiring for a Senior Software Engineer to join a highly collaborative engineering team tackling critical backend challenges. This is your chance to work on services used by some of the most recognisable global brands. What You'll Be Doing * Designing and implementing backend microservices using Java and Spring Boot * Building and refining RESTful APIs that power secure, real-time payment flows * Writing clean, testable code with a focus on quality, performance, and reliability * Leading on feature analysis, architecture decisions, and release planning * Contributing to peer reviews, automated testing, and continuous integration * Mentoring Junior De
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        Frontend Engineer

        Ocho
        Belfast, County Antrim
        £60,000 - £100,000 per annum
        Are you a Frontend Engineer who wants to work on something that truly makes an impact? This is a rare opportunity to join a high-growth, product-led tech company as they build a brand-new FinOps platform from the ground up. You'll play a central role in designing, building, and delivering beautiful, performant, and scalable web applications that visualise complex cloud data and FinOps insights. You'll be joining a cross-functional, international team working in close collaboration across Front-End, Backend, Product and SRE. The engineering leadership is based in the UK, and the company has a strong reputation for hiring top-tier talent and empowering engineers to thrive. Job Description * Design, develop, and operate robust, high-performance frontend applications using React and TypeScript * Collaborate closely with Backend, Product and Design teams to deliver intuiti
        Are you a Frontend Engineer who wants to work on something that truly makes an impact? This is a rare opportunity to join a high-growth, product-led tech company as they build a brand-new FinOps platform from the ground up. You'll play a central role in designing, building, and delivering beautiful, performant, and scalable web applications that visualise complex cloud data and FinOps insights. You'll be joining a cross-functional, international team working in close collaboration across Front-End, Backend, Product and SRE. The engineering leadership is based in the UK, and the company has a strong reputation for hiring top-tier talent and empowering engineers to thrive. Job Description * Design, develop, and operate robust, high-performance frontend applications using React and TypeScript * Collaborate closely with Backend, Product and Design teams to deliver intuiti
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        Senior Java Developer - £70,000 to £100,000 - 3 Days On-Site | Central Belfast | Cutting-Edge Projects - The Opportunity - My client is looking for an experienced Senior Java Developer to join a growing engineering team in the heart of Belfast. This is a chance to work on technically challenging, high-impact projects in a collaborative, innovation-driven environment. This client have invested in creating a modern, well-appointed office space designed for productivity, creativity, and teamwork. You'll spend three days a week on-site with like-minded engineers, sharing ideas and solving problems together, with two days to focus from home. What You'll Do * Design, develop, and deliver scalable, secure Java applications * Collaborate with cross-functional teams to shape technical solutions * Optimise performance, reliability, and maintainability across our services
        Senior Java Developer - £70,000 to £100,000 - 3 Days On-Site | Central Belfast | Cutting-Edge Projects - The Opportunity - My client is looking for an experienced Senior Java Developer to join a growing engineering team in the heart of Belfast. This is a chance to work on technically challenging, high-impact projects in a collaborative, innovation-driven environment. This client have invested in creating a modern, well-appointed office space designed for productivity, creativity, and teamwork. You'll spend three days a week on-site with like-minded engineers, sharing ideas and solving problems together, with two days to focus from home. What You'll Do * Design, develop, and deliver scalable, secure Java applications * Collaborate with cross-functional teams to shape technical solutions * Optimise performance, reliability, and maintainability across our services
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        This is a hands-on, collaborative role focused on API-level test automation, BDD/TDD practices, and CI/CD pipeline integration. * Background in API testing and automation with tools like Selenium, Cypress, or Playwright
        This is a hands-on, collaborative role focused on API-level test automation, BDD/TDD practices, and CI/CD pipeline integration. * Background in API testing and automation with tools like Selenium, Cypress, or Playwright
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        Java Developer

        Adepta Partners Limited
        Belfast, County Antrim
        £ Not Disclosed
        Contract Java Developer Financial Services 6 Months?? Location: UK-based, hybrid?? Rate: £400/day (Outside IR35)?? Length: 6 Months - Possibility of extension We're hiring a Java Developer for a leading financial services client. You'll work on backend systems in a fast-paced environment, writing clean, scalable code. Skills Required * Strong Java (11+) experience * Some Python exposure * Spring Boot, REST APIs, microservices * Git, CI/CD, testing * Financial services experience (desirable) Start ASAP apply now. Java Python Financial Services DevOps
        Contract Java Developer Financial Services 6 Months?? Location: UK-based, hybrid?? Rate: £400/day (Outside IR35)?? Length: 6 Months - Possibility of extension We're hiring a Java Developer for a leading financial services client. You'll work on backend systems in a fast-paced environment, writing clean, scalable code. Skills Required * Strong Java (11+) experience * Some Python exposure * Spring Boot, REST APIs, microservices * Git, CI/CD, testing * Financial services experience (desirable) Start ASAP apply now. Java Python Financial Services DevOps
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        Contribute to development across API backends, web interfaces, and mobile applications.
        Contribute to development across API backends, web interfaces, and mobile applications.
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        Frequently Asked Questions

        How many API jobs are there in Belfast?
        There are 64 API jobs within 5 miles of Belfast available on NIJobs right now.

        What other similar jobs are there to API jobs in Belfast?
        As well as API jobs in Belfast, you can find IT, Software Development, Testing, amongst many others.

        How many temporary and part-time API jobs are available in Belfast?
        There are 1 temporary API jobs and 0 part-time API jobs available in Belfast at the moment.