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        1 API job in Belfast + 20 miles

        Beckend Engineer Intern - Placement Year 2026

        Proofpoint
        Belfast, County Antrim
        Competitive
        The Tessian product offers inbound threat defence software, via API, to Microsoft or Google e-mail platforms, as well as a data loss prevention (DLP) service that utilises Machine Learning for maximum protection.
        The Tessian product offers inbound threat defence software, via API, to Microsoft or Google e-mail platforms, as well as a data loss prevention (DLP) service that utilises Machine Learning for maximum protection.
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        1 exact match is outside your preferred location

        Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
        Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
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        Work with Python 3 and AWS to build and evolve backend services and distributed systems that handle large volumes of data efficiently. * Participate in technical discussions and design reviews, contributing ideas and learning from more experienced engineers. * Backend software development (our codebase is Python, but were open to candidates transitioning from Java or similar languages). * Clear, thoughtful communication skills, both written and verbal, when working with engineers and non-engineers alike. Proofpoint is a global leader in human- and agent-centric cybersecurity. We protect how people, data, and AI agents connect across email, cloud, and collaboration tools. Over 80 of the Fortune 100, 10,000 large enterprises, and millions of smaller organizations trust Proofpoint to stop threats, prevent data loss, and build resilience across their people and AI workflows.
        Work with Python 3 and AWS to build and evolve backend services and distributed systems that handle large volumes of data efficiently. * Participate in technical discussions and design reviews, contributing ideas and learning from more experienced engineers. * Backend software development (our codebase is Python, but were open to candidates transitioning from Java or similar languages). * Clear, thoughtful communication skills, both written and verbal, when working with engineers and non-engineers alike. Proofpoint is a global leader in human- and agent-centric cybersecurity. We protect how people, data, and AI agents connect across email, cloud, and collaboration tools. Over 80 of the Fortune 100, 10,000 large enterprises, and millions of smaller organizations trust Proofpoint to stop threats, prevent data loss, and build resilience across their people and AI workflows.
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        Role description:C#/React Full-Stack Senior Engineer * 5+ years of experience in software development using C#, NET Core, React,Typescript and related technologies - At BlackRock, we are looking for a C#/React Full-Stack Senior Engineerwho likes to innovate and solve complex problems. In the last few years, the team has undergone a significant evolution in its technology stack to focus on C#, ASP.Net and React. To meet the increased demands on the team, there is the opportunity for a senior engineer to join continue driving the successful delivery of high-profile solutions and the technology evolution. We work with modern tooling (.Net 10 / React 18) and have the freedom to select the best tools and innovate to solve any problem. About this role - Are you interested in building innovative technology that shapes the financial markets?
        Role description:C#/React Full-Stack Senior Engineer * 5+ years of experience in software development using C#, NET Core, React,Typescript and related technologies - At BlackRock, we are looking for a C#/React Full-Stack Senior Engineerwho likes to innovate and solve complex problems. In the last few years, the team has undergone a significant evolution in its technology stack to focus on C#, ASP.Net and React. To meet the increased demands on the team, there is the opportunity for a senior engineer to join continue driving the successful delivery of high-profile solutions and the technology evolution. We work with modern tooling (.Net 10 / React 18) and have the freedom to select the best tools and innovate to solve any problem. About this role - Are you interested in building innovative technology that shapes the financial markets?
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        Senior Software Developer

        Oscar Associates (UK) Limited
        Newcastle Upon Tyne (NE1)
        £60000 - £70000 per annum
        They are looking for a Senior Full Stack Engineer to play a key role in delivering the first iteration of a strategic cloud platform that will expand under a 'fail fast' innovation model. This is an excellent opportunity for a senior engineer who thrives in structured, security-focused environments and enjoys building clean, scalable systems from the ground up. You'll join a senior engineering team delivering a greenfield platform consisting of a .NET MAUI mobile application (iOS & Android), an Angular 21 web application, and Azure-hosted backend services built using clean architecture principles. * At least 5 years' commercial software engineering experience - Full Stack Engineer - UK (Remote) - £60k-£70k - I'm working with a UK-based organisation that is building a secure, offline-capable property visiting platform using modern Microsoft technologies. The Opportunity
        They are looking for a Senior Full Stack Engineer to play a key role in delivering the first iteration of a strategic cloud platform that will expand under a 'fail fast' innovation model. This is an excellent opportunity for a senior engineer who thrives in structured, security-focused environments and enjoys building clean, scalable systems from the ground up. You'll join a senior engineering team delivering a greenfield platform consisting of a .NET MAUI mobile application (iOS & Android), an Angular 21 web application, and Azure-hosted backend services built using clean architecture principles. * At least 5 years' commercial software engineering experience - Full Stack Engineer - UK (Remote) - £60k-£70k - I'm working with a UK-based organisation that is building a secure, offline-capable property visiting platform using modern Microsoft technologies. The Opportunity
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        Frequently Asked Questions

        How many API jobs are there in Belfast?
        There are 1 API jobs within 20 miles of Belfast available on JustEngineers right now.

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