41 API jobs in County Down + 5 miles

Senior Software Engineer

DailyPay Inc
Belfast, County Antrim
£ Not Disclosed
DailyPay is transforming the way people get paid. As a worktech company and the industry's leading on demand pay solution, DailyPay uses an award-winning technology platform to help America's top employers build stronger relationships with their employees. This voluntary employee benefit enables workers everywhere to feel more motivated to work harder and stay longer on the job while supporting their financial well-being outside of the workplace. DailyPay is headquartered in New York City, with operations throughout the United States as well as in Belfast. For more information, visit DailyPay's Press Center. You'll work alongside a supportive, high-impact team of skilled backend developers to improve how other teams deploy and access their services, how we move data across our platform, and how we automate operations to enable future scale.
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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
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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
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Senior Frontend Engineer

DailyPay Inc
Belfast, County Antrim
£ Not Disclosed
Technical Ability - Proficiency in React (including Hooks, Context API, and modern best practices). * Experience with RESTful API integration and data fetching * Experience with state management solutions (e.g., Redux, Zustand, Context API)
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As Software Architect, you will lead the design and development strategy across critical API, gateway, and switching platforms within a nationwide payment processing ecosystem. * Proven success designing scalable SaaS platforms and API-based architectures
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IT Business Analyst (Technology Solution Analyst)

CME Technology Support Services Ltd
Belfast, County Antrim
£ Not Disclosed
The CME Markets Technology team is looking for a Technology Solution Analyst III to join the global Technology solutions and architecture team. The team is responsible for providing technical analysis that drives the evolution and growth of CME's core trade execution systems that power our electronic trading platforms CME Globex, EBS Direct and BrokerTec Stream. Our systems need to be both low latency and have high reliability while continuously delivering new features. The role will initially be focused on CME's Trade Dissemination and related systems, working in concert with the business, operations, development, and testing teams to provide creative solutions that meet the needs of our business and maintain our performance profile. The analyst will perform execution delivery activities like impact analysis, requirements discovery, scenario creation, test distillati
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NEW
Job type: Permanent - Location: Newry - Job Overview * HPLC Analysis * GC Analysis * UV / IR Spectrometry * Wet-Chemistry Techniques * Preparation and Completion of associated Documentation * Applicants must be educated to degree level in a Science related discipline with a strong analytical background. Applicants with 2 years GMP laboratory experience will be considered in the absence of a degree * Excellent written and oral communication skills * Practical Laboratory experience * GMP experience * HPLC/GC experience - Duration: Full time, permanent * Applicants should be able to provide proof that they have a right to work in the UK at the time of their application. Applicants who are unable to provide this proof will not be considered. * We regret that applications received after the closing date and time will not be accepted. Free Life Assurance - Company Pension S
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The Opportunity - Ocho is partnering with a fast-scaling, product-led Client to find a Software Engineer to help lead the design and evolution of their new platform. You'll help design, build, and deploy the next generation of back-end systems that power their modern software ecosystem. Key Responsibilities * Collaborate closely with team members to deliver high-quality, testable, and valuable software * Take ownership of back-end services and APIs, with a focus on user-visible behaviour * Participate in deployments, support CI/CD pipelines, and assist with planning and delivery * Contribute ideas for improving processes, tooling, and architecture - Essential Experience * 3+ years .Net experience * Experience in server-side development * Familiarity with full-stack development and database systems * Strong communication and problem-solving skills - What you'll get?
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Principal Typescript Engineer

Ocho
Belfast, County Antrim
£105,000 - £110,000 per annum
One of the fastest-growing software-led companies in the US is building out a new engineering hub in Belfast and is looking to hire a Principal TypeScript Engineer as one of their foundational local hires. The company operates in a high-impact, real-world domain and is scaling fast off the back of major investment and a successful product-market fit. This is a chance to shape technical direction, influence architecture across multiple products, and grow with a company building modern, high-scale systems. You'll collaborate with teams across the US and Europe, and play a key leadership role within a brand-new Belfast engineering group. * Leading the development of scalable applications using modern TypeScript across both backend (Node.js) and frontend (React) * Influencing architectural decisions across multiple product streams
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Data Engineer

VANRATH
Belfast, County Antrim
£ Not Disclosed
Lead Data Engineer - Enterprise Data Warehouse (Fully Remote) VANRATH is proud to be working with a global leader in the payments industry to recruit a Lead Data Engineer for a fully remote, permanent role. This is a unique opportunity to design and build a centralised enterprise data warehouse, creating a single source of truth that will drive business-critical insights and enable strategic decision-making across the organisation. This is an ideal role for someone passionate about building data platforms from the ground up - with full autonomy to architect, implement, and evolve solutions that will shape the future of data within a dynamic, fast-paced business environment. Key Responsibilities - Design and develop a comprehensive, cloud-based enterprise data warehouse using industry best practices (Kimball, Data Vault, Data Mesh methodologies)
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Data Engineer

Adepta Partners Limited
Belfast, County Antrim
£45,000 - £55,000 per annum
Our client is a global firm that thrives on innovation and creating positive change. They work with some of the biggest names across a range of thriving industries and offer fantastic growth opportunities. They are heavily investing in their data team here in Belfast - hiring from Junior right up to Lead positions, working on a hybrid basis from some of city's newest and most modern offices. As part of the clients Digital team, youll work alongside colleagues from across the company delivering transformative digital solutions to todays most complex business challenges. What's in it for you? * Great salaries and annual bonus * Flexible hybrid working options * Private medical insurance, critical illness and life/income protection insurance * Generous pension scheme * Cutting-edge projects using AWS and other modern technologies - What are we looking for?
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Embedded Software Developer- Contract

MCS Group
Belfast, County Antrim
£75,000 - £85,000 per annum
Are you a talented and experienced Embedded Software Engineer looking to make an impact within a forward-thinking team? MCS Group is looking for a motivated individual to design, develop, and optimise software solutions tailored to client needs and hardware platforms. * Develop and modify software for embedded systems to enhance performance and efficiency * Analyse user requirements and create tailored software solutions * Debug and resolve complex technical issues * Collaborate across teams to define specifications, requirements, and solutions * Write clean, well-documented, and testable code * Prioritise tasks and manage project deadlines with minimal supervision * Bachelor's degree in Computer Science, Engineering or a related field * You will have been working in a commercial software engineering position for a few years now, and will have spent a proportion of th
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AI Engineer

Ocho
Belfast, County Antrim
£60,000 - £80,000 per annum
Are you an AI Engineer ready to design and deploy cutting-edge AI systems in a secure, regulated, cloud-first environment? My client is expanding with a multi-million-pound investment in new infrastructure and a significant recruitment drive. As part of this growth, they're looking for a skilled AI Engineer to take the lead in building secure, compliant, and high-performing AI solutions-particularly around Retrieval-Augmented Generation (RAG), Large Language Models (LLMs), and responsible AI deployment. This is an excellent opportunity to work in a modern, Microsoft-based tech stack, tackling greenfield projects that make a real impact in a highly regulated industry. What's in it for you? * Competitive Salary: £60-80k * 30 days of annual leave (rising to 35 over time) * Employer pension contributions * Employee Benefits Program (after probation)
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Technical Support Engineer (US Hours)

MCS Group
Belfast, County Antrim
£30,000 - £45,000 per annum
Product Support Engineer - **MUST BE BASED IN NORTHERN IRELAND** MCS Group is delighted to be exclusively partnering up with a fantastic, new Cyber Security focused organisation on their search for a Product Support Engineer to join their growing team here in Belfast. This multi-national SAAS house champions career progression and growth, as well as a very trusting and flexible working environment. What You'll Do * Troubleshoot technical issues across Linux, AWS, databases, and containers * Support users through tickets, live chat, and screen shares * Create documentation and contribute to the knowledge base * Collaborate with engineering and product teams on escalations * Work US business hours, 2pm-10pm - What You'll Bring * Strong problem-solving skills and technical curiosity * Experience with cloud infrastructure, networking, and debugging
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Professional Services | VANRATH Exclusive - VANRATH is delighted to be partnering with a leading professional services organisation based in Belfast to recruit a Senior Full Stack Engineer. This is an exciting opportunity to join a company undergoing significant digital transformation, offering the chance to work on high-impact projects in a flexible hybrid environment. You'll join a dynamic team responsible for building scalable, modern web applications using Node.js on the backend and either React or Angular on the frontend. This role requires a hands-on developer with strong architectural insight and a passion for clean, maintainable code. * Design, develop, and deploy full-stack solutions using modern JavaScript frameworks. * Collaborate with cross-functional teams including product, design, and DevOps. * Write high-quality, reusable, and testable code.
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Senior Ruby On Rails Developer

Ocho
Belfast, County Antrim
£85,000 - £95,000 per annum
Senior Software Engineer Ruby on Rails - Location: Remote - Type: Full-time | Permanent - Tech Stack: Ruby on Rails, StimulusJS, PostgreSQL, Sidekiq, GraphQL - The Opportunity - Join a fast-growing platform used by thousands across the US. Were looking for a Senior Full Stack Engineer who thrives in Ruby on Rails environments and knows how to ship clean, scalable features. Youll be building new APIs, refining performance, and working in close collaboration with product, design and engineering peers. This is a high-impact role with room to grow ideal for someone whos hands-on, thoughtful, and excited by complex technical challenges. What Youll Be Doing * Build, scale and improve core platform features. * Write robust, maintainable Ruby code across services and APIs. * Work across web and mobile backends, with a strong eye on performance. * Integrate third-party APIs an
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Full-time, Permanent - I am currently working with an NI based team who are looking for an experienced web developer to join the team. The company are looking for someone who is happy to come in and be one of the only Shopify developers in the team. You will work closely alongside the graphic designer and sales teams. The team require someone who can work on-site 4 days per-week. This is a great opportunity to move into one of the most successful online platforms in Ireland. They are open to mid-senior level candidates. * Build, customise and maintain responsive Shopify websites * Develop and implement custom themes, features, and third-party integrations * Optimise site performance, speed, and UX across devices * Work closely with our design, marketing, and product teams to translate ideas into functional, user-friendly storefronts
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React Developer needed to join the world's newest IoT company * Are you a React/TypeScript developer looking for a new challenge? * Do you want to work with some of the brightest minds in Northern Ireland? * Want to work on true greenfield projects that nobody has done before? The Role - In this hands-on role, you'll be joining a small team of highly capable professionals responsible for designing, developing, and maintaining high-performance, scalable web applications using React and TypeScript. Your new company has a multi-billion-dollar revenue stream and no weak links as they've already started onboarding some of Northern Ireland's most prolific technologists. What's In It For You? * Market-leading salaries * Generous holidays and fully remote working available (NI Wide) * Attractive equity * Personal health & wellness package * Quarterly wellness workshops
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Frequently Asked Questions

How many API jobs are there in County Down?
There are 41 API jobs within 5 miles of County Down available on NIJobs right now.
What other similar jobs are there to API jobs in County Down?
As well as API jobs in County Down, you can find IT, Software Development, Database, amongst many others.