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38 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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AI Engineer

ARC Regulatory Ltd
Belfast, County Antrim
£ Not Disclosed
API & Integration Experience: Experience with REST APIs, GraphQL, and microservices architectures.
API & Integration Experience: Experience with REST APIs, GraphQL, and microservices architectures.

Azure Data Architect ( NEW )

Ocho
Belfast, County Antrim
£61,000 - £80,000 per annum
API Development: Develop APIs and web services (.NET/C) to support secure data exchange and third party connectivity. Hands on with modern API development (REST, SOAP) and data formats (JSON, XML).
API Development: Develop APIs and web services (.NET/C) to support secure data exchange and third party connectivity. Hands on with modern API development (REST, SOAP) and data formats (JSON, XML).
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Senior Software Developer ( AI )

Ocho
Belfast, County Antrim
£70,000 - £80,000 per annum
Hybrid 20 mins from Belfast | Up to £80,000 + Share Options | Product Ownership | Start-Up Environment - OCHO | Building Teams - OCHO is proud to be working with a fast-growing AI start-up to help find a Senior Software Developer to join their small but mighty engineering team. This is a brilliant opportunity for someone who thrives in a hands-on, product-led environment and wants to take more ownership across the full development lifecycle. This company has built an intelligent, AI-powered platform thats helping organisations within financial services make faster, more accurate decisions across their core operations. Still in the early stages of scale, theyre looking for a developer who can grow with the business, shape how they build, and be a critical part of delivering new features and enhancements as the product evolves.
Hybrid 20 mins from Belfast | Up to £80,000 + Share Options | Product Ownership | Start-Up Environment - OCHO | Building Teams - OCHO is proud to be working with a fast-growing AI start-up to help find a Senior Software Developer to join their small but mighty engineering team. This is a brilliant opportunity for someone who thrives in a hands-on, product-led environment and wants to take more ownership across the full development lifecycle. This company has built an intelligent, AI-powered platform thats helping organisations within financial services make faster, more accurate decisions across their core operations. Still in the early stages of scale, theyre looking for a developer who can grow with the business, shape how they build, and be a critical part of delivering new features and enhancements as the product evolves.
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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
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
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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Staff Mobile Developer

Ocho
Belfast, County Antrim
£75,000 - £85,000 per annum
Lead Mobile Developer - NI based, Remote First | Permanent | Up to £85,000 + Benefits - OCHO | Building Teams - Ocho are hiring a Lead Mobile Developer to drive the design, development and delivery of a high-performance mobile application used by thousands of active users. Youll take full ownership of a React Native codebase in a fast-paced product-led environment, collaborating with Product, Design, and Backend teams to ship meaningful features with real impact. This is your chance to join a high-calibre engineering team with strong backing, exciting greenfield work ahead, and a culture that truly values autonomy, ownership and craft. What Youll Do * Own and lead the architecture, design and development of a large-scale React Native mobile app * Collaborate with cross-functional teams to define and deliver end-to-end features across iOS and Android
Lead Mobile Developer - NI based, Remote First | Permanent | Up to £85,000 + Benefits - OCHO | Building Teams - Ocho are hiring a Lead Mobile Developer to drive the design, development and delivery of a high-performance mobile application used by thousands of active users. Youll take full ownership of a React Native codebase in a fast-paced product-led environment, collaborating with Product, Design, and Backend teams to ship meaningful features with real impact. This is your chance to join a high-calibre engineering team with strong backing, exciting greenfield work ahead, and a culture that truly values autonomy, ownership and craft. What Youll Do * Own and lead the architecture, design and development of a large-scale React Native mobile app * Collaborate with cross-functional teams to define and deliver end-to-end features across iOS and Android
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.Net Developer

MCS Group
Belfast, County Antrim
£30,000 - £70,000 per annum
.NET & React Developers - All Levels | Tech-for-Good | Hybrid (NI-based) Are you a passionate .NET or React developer who wants to use your skills to make a real difference in the world? Looking for meaningful work, modern tech, and a company that actually cares about impact? We're working with a mission-driven Tech-for-Good software company that's about to open new roles across their engineering team - from junior to senior level - and we're looking to connect with brilliant developers ahead of the launch. Whether you're back-end, front-end or full-stack - if you work with .NET, C#, React, or Azure, we want to hear from you. Why join? * Tech for good: Build software that positively impacts lives across healthcare, education, and social sectors. * Modern stack: .NET Core, React, Azure, CI/CD pipelines, clean architecture.
.NET & React Developers - All Levels | Tech-for-Good | Hybrid (NI-based) Are you a passionate .NET or React developer who wants to use your skills to make a real difference in the world? Looking for meaningful work, modern tech, and a company that actually cares about impact? We're working with a mission-driven Tech-for-Good software company that's about to open new roles across their engineering team - from junior to senior level - and we're looking to connect with brilliant developers ahead of the launch. Whether you're back-end, front-end or full-stack - if you work with .NET, C#, React, or Azure, we want to hear from you. Why join? * Tech for good: Build software that positively impacts lives across healthcare, education, and social sectors. * Modern stack: .NET Core, React, Azure, CI/CD pipelines, clean architecture.
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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
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)
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?
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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Contribute to API development (REST/GraphQL) and data integration pipelines * Deep understanding of AWS serverless tools (Lambda, DynamoDB, API Gateway, etc.) * Familiarity with GraphQL APIs and scalable API design
Contribute to API development (REST/GraphQL) and data integration pipelines * Deep understanding of AWS serverless tools (Lambda, DynamoDB, API Gateway, etc.) * Familiarity with GraphQL APIs and scalable API design
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Salary: £100k+ market-leading benefits package - Our client is a rapidly scaling, VC-backed technology company focused on cloud cost optimization and FinOps solutions for enterprises and MSPs operating across hybrid and multi-cloud environments. With over a decade of experience and recent strategic acquisitions, they are evolving into a product-led platform business - leveraging AI/ML insights, structured cost data, and seamless integrations to drive cloud ROI. A proud member of the FinOps Foundation, the company is at the forefront of the emerging BillOps movement and is investing heavily in machine learning talent to unlock the next phase of intelligent automation and cost intelligence. As one of the first UK/Northern Ireland ML engineering hires, this is a rare opportunity to shape both the technical foundation and future team culture.
Salary: £100k+ market-leading benefits package - Our client is a rapidly scaling, VC-backed technology company focused on cloud cost optimization and FinOps solutions for enterprises and MSPs operating across hybrid and multi-cloud environments. With over a decade of experience and recent strategic acquisitions, they are evolving into a product-led platform business - leveraging AI/ML insights, structured cost data, and seamless integrations to drive cloud ROI. A proud member of the FinOps Foundation, the company is at the forefront of the emerging BillOps movement and is investing heavily in machine learning talent to unlock the next phase of intelligent automation and cost intelligence. As one of the first UK/Northern Ireland ML engineering hires, this is a rare opportunity to shape both the technical foundation and future team culture.
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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
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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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)
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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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
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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Senior OO Developer ( Java )

Ocho
Belfast, County Antrim
£61,000 - £71,000 per annum
Senior Backend Engineer Kotlin / JVM | Cloud-Native Platform - Location: UK (Remote-first) Building Teams OCHO - Were working with a product-led scaleup building the next generation of marketplace infrastructurebringing together deep domain complexity, cloud-native scale, and a culture that values clean architecture, engineering maturity, and collaborative delivery. This client is growing their backend capability and hiring a Senior Backend Engineer who can balance systems thinking with code quality, fast iteration, and product ownership. This is a team where youll influence not just what gets builtbut how. What Youll Be Doing * Designing and building performant, secure, and scalable backend services using Kotlin within a Spring Boot and GCP ecosystem. * Contributing to the evolution of a distributed, service-oriented architecture, including ownership of core product
Senior Backend Engineer Kotlin / JVM | Cloud-Native Platform - Location: UK (Remote-first) Building Teams OCHO - Were working with a product-led scaleup building the next generation of marketplace infrastructurebringing together deep domain complexity, cloud-native scale, and a culture that values clean architecture, engineering maturity, and collaborative delivery. This client is growing their backend capability and hiring a Senior Backend Engineer who can balance systems thinking with code quality, fast iteration, and product ownership. This is a team where youll influence not just what gets builtbut how. What Youll Be Doing * Designing and building performant, secure, and scalable backend services using Kotlin within a Spring Boot and GCP ecosystem. * Contributing to the evolution of a distributed, service-oriented architecture, including ownership of core product
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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
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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Frequently Asked Questions

How many API jobs are there in Belfast?
There are 38 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, Database, amongst many others.