6 of 6 Permanent API Design Jobs in Northern Ireland

AI Backend Engineer - Data & Integration

Hiring Organisation
Digital Iron
Location
Belfast, Northern Ireland, United Kingdom
intersection of knowledge graphs, real-time IoT data, and enterprise integration—building infrastructure that thousands of businesses will depend on. What You'll Own Design the framework that supports multiple partnership and customer models: Deep Embedded (white-label components), Best-of-Breed SaaS (standalone platform with APIs), Data Layer … Only (predictions via API) Evaluate architectural tradeoffs across complexity, risk, scalability, time-to-market, and value capture for each pattern Make build vs. buy decisions: direct API integrations vs. iPaaS middleware vs. embedded agents Define authentication strategies across OAuth 2.0, certificate-based auth, and federated identity for different ...

Backend Engineer (Golang) - Grow into a Senior Role

Hiring Organisation
KYP
Location
Belfast, UK
Employment Type
Full-time
FinTech/RegTech startup, growing fast and trusted by regulated organisations. Engineering quality is at the core of everything we do - we value clean design, strong ownership, and systems that scale. The Opportunity We're looking for a Go Backend Engineer who wants to level up into a senior … data-intensive systems and be trusted with real ownership from day one. This is not a "ticket-factory" role, you'll be involved in design decisions, architecture discussions, and performance optimisation, with direct exposure to the CTO and senior engineers. If you enjoy solving complex backend problems, learning modern ...

Senior .Net Developer

Hiring Organisation
Earnly
Location
Belfast, UK
Employment Type
Full-time
with third-party services like Stripe, PayPal, and Open Banking providers. Key Responsibilities: Build and maintain robust RESTful APIs for mobile and web clients. Design and manage databases built in MongoDB and SQL Server to store, query, and aggregate user financial data. Develop data ingestion pipelines to process real … . Proficient in .Net, Core 8, Razor Pages and Bootstrap 5 for UI. Experience with databases such as MongoDB and SQL Server, including schema design, indexing, and performance tuning. Familiarity with cloud platforms like Azure (we use Azure). Experience with containerization tools (Docker, Docker Compose) and deployment pipelines. ...

Senior Software Engineer (PHP)

Hiring Organisation
True9
Location
Belfast, UK
Employment Type
Full-time
front-end teams in a fast-paced Agile environment. You'll thrive in this role if you have: Strong working experience in PHP, OOP, design patterns and principles, including SOLID Strong understanding of automated testing practices Expertise in performant MySQL and relational database design Hands-on experience with … API design and development Comfortable using modern tooling, including Docker, Git, PHPStan, PHPUnit and CI/CD Experience in Symfony Familiarity with cloud services, particularly AWS Experience in agile environments and contributing to team collaboration A proactive, solutions-oriented mindset and excellent communication skills The tech stack ...

Principal Software Engineer (DevOps)

Hiring Organisation
Oracle
Location
Belfast, UK
Employment Type
Full-time
Join OCI's Edge Security team as a Principal Engineer to architect and deliver cloud-scale DDoS protection. You'll lead design for high-performance detection and mitigation systems, drive automation and operational excellence, and set the technical direction for customer-facing DDoS capabilities across OCI's global edge. … more: Java/Python/C Rust/Go (strong preference for Java for control-plane/services). Deep systems design expertise: concurrency, memory management, performance tuning, API design, consistency models, and distributed systems fundamentals. Proven DevOps leadership at scale: CI/CD, automated testing, canarying ...

Senior Software Engineer (C++/SDK)

Hiring Organisation
Enso Recruitment
Location
Antrim, Northern Ireland, United Kingdom
enjoys architecting SDKs, working close to hardware, and building robust, developer-friendly tools used in commercial, high-performance systems. The Role Lead the architecture, design, and ongoing development of a C based Software Development Kit (SDK) Define and maintain API design standards, coding guidelines, and best practices … Develop and maintain cross-platform SDK functionality (Windows, Linux, etc.) Integrate and support third-party hardware drivers (USB3, CoaXPress, CameraLink, GigE, or similar) Design and develop intuitive GUIs for internal R&D use, production, and customer demonstrations Collaborate closely with hardware, QA, product, and commercial teams Mentor junior engineers ...