7 of 7 API Design Jobs in Northern Ireland

award winning B2B SaaS platform that is entering the Belfast market with ambitious plans to scale our team rapidly, with over 100 hires planned through 2026. Primary Job Responsibilities Design & build future proof solutions to support growing business needs while thoroughly considering the system impact Mentor and lead our engineers to develop solutions from idea to implementation by estimating … of developing in C#, Java or other OO programming languages Minimum 7+ years of hands on experience programming on the .NET platform using C#, including ASP.NET (MVC) Expertise with Design Patterns, refactoring, OO Design and related areas Experience in Web API design principles and best practices Comfortable with database design and development Hands on experience More ❯

member of the team, you'll set technical direction, mentor others, and drive quality across the full stack. AI Integration & Development Collaborate closely with the AI platform team to design and deliver compelling AI-first features and products Integrate AI capabilities seamlessly into existing products, ensuring smooth user experiences Build responsive, intuitive UI components that make complex AI functionality … users Optimize AI service performance, cost, and reliability in production environments Technical Leadership & Delivery Architect and implement scalable, production-ready AI-powered applications from front-end to back-end Design and build performant, secure back-end services that integrate with our AI platform Create user-friendly front-end interfaces for AI features using modern JavaScript frameworks or C# and … serving users Strong full-stack capability with expertise in: Modern JavaScript frameworks (React, Vue, Angular, etc.) or Blazor for front-end development C# .NET for back-end services RESTful API design and implementation HTML5, CSS3, and responsive design principles Cloud platform experience with Azure, AWS, or GCP Production systems mindset including observability, testing, security, and reliability Agile More ❯

member of the team, you'll set technical direction, mentor others, and drive quality across the full stack. AI Integration & Development Collaborate closely with the AI platform team to design and deliver compelling AI-first features and products Integrate AI capabilities seamlessly into existing products, ensuring smooth user experiences Build responsive, intuitive UI components that make complex AI functionality … users Optimize AI service performance, cost, and reliability in production environments Technical Leadership & Delivery Architect and implement scalable, production-ready AI-powered applications from front-end to back-end Design and build performant, secure back-end services that integrate with our AI platform Create user-friendly front-end interfaces for AI features using modern JavaScript frameworks or C# and … serving users Strong full-stack capability with expertise in: Modern JavaScript frameworks (React, Vue, Angular, etc.) or Blazor for front-end development C# .NET for back-end services RESTful API design and implementation HTML5, CSS3, and responsive design principles Cloud platform experience with Azure, AWS, or GCP Production systems mindset including observability, testing, security, and reliability Agile More ❯

We’re partnering with a growing Fintech company in Belfast building innovative products that simplify financial operations for businesses across the UK and Ireland. As an API Engineer, you’ll be designing and developing secure, scalable APIs that power integrations between internal platforms, third parties, and AI-driven systems. You’ll work in a collaborative engineering environment focused on … clean architecture, modern .NET development, and continuous delivery. Key Skills: Strong backend experience with C# .NET Solid understanding of RESTful API design and SQL Experience with Azure services and CI/CD pipelines Familiarity with OAuth, JWT, and API security principles Nice to Have: Knowledge of event-driven architectures, API gateways, or Azure API Management More ❯

months. They will have a number of different AI focused roles going live but to start we're focused on finding a number of Senior Software Engineers focusing on API architecture and design. The team is currently focused on developing a platform designed to accelerate AI and generative AI initiatives across the organisation. This is the core team who … automation — not chatbots. We’re talking end-to-end workflow intelligence : document ingestion → accounting → tax → filing — used by tens of thousands of businesses. You’ll architect and own the API layer that powers product integrations, platform scalability, and smart AI features across multiple mission-critical systems. What you’ll do: - Design and build secure, scalable APIs in C# …/.NET + Azure - Shape API standards, gateway strategy, versioning & authentication - Drive event-driven integrations and seamless third-party connectivity - Lead API performance, reliability, and observability improvements - Mentor engineers and influence architecture across multiple teams What you bring: - Deep C#/.NET experience in production systems - Strong REST API design + OpenAPI/Swagger knowledge - SQL More ❯

organisation, and ecosystems to make an impact that matters to our clients and to society. We're a new type of creative digital consultancy that fuses strategy, tech and design to identify where businesses need to be, then get them there. Fast. Want to help us shape the future? We're looking for experienced engineers to work with our … it matters most. Connect to your opportunity As a technical architect, you will play a crucial role in our agile project delivery by collaborating with cross-functional teams to design and implement flexible, scalable, and secure technical solutions. You will work closely with client stakeholders to understand requirements, provide technical leadership, and ensure that the architecture aligns with agile … backgrounds, and perspectives. Willing and eligible to apply and obtain UK security clearance to Security Check (SC) level, if not holding an existing clearance Extensive experience in digital architecture design and implementation Strong knowledge of public sector regulations and compliance requirements Proficiency in cloud technologies and architecture (e.g. AWS, Azure, Google Cloud) Expertise in software development methodologies and best More ❯

a fast-growing cybersecurity and enterprise SaaS company that's redefining how global organisations secure and connect their devices. They're hiring for a Enterprise Integrations Engineer to help design, build and scale the integrations powering their enterprise ecosystem. This is a hands-on, highly cross-functional role that bridges engineering, product, and customer success. You'll work on … cutting edge API integrations, helping customers embed security , automation, and observability into their environments at scale. What you'll do: Design and develop integrations with enterprise systems - MDMS, SIEMs, SOAR. Build and maintain APIs, SDKs, and automation frameworks. Collaborate with enterprise customers. Ensure scalability and reliability across large deployments. Contribute to developer experience by improving API documentation … sample code and internal tooling. Work closely with the product and platform teams. Skills required: 4+ years of integration engineering or API development roles. Strong Python skills, and a good understanding of RESTful APIs, JSON and authentication. Experience with Intune, Jamf, Splunk, Okta, ServiceNow, or Jira. Postman for API design. Knowledge of SSO, SAML, SCIM, or OIDC workflows. More ❯