Top Software Engineer Jobs in Belfast

The Sr. Software Engineer will design, develop, and maintain public APIs and integrations, ensuring high scalability and performance while improving code quality using AI tools.

The Senior Full-Stack Engineer will design and build scalable UI systems, collaboratively own features, and support production quality. Responsibilities include API design, debugging, and performance tuning.

The Software Developer will collaborate on new software applications using JavaScript and AgilePoint, providing support, documentation, and managing enhancements.

Build and ship backend features for a multi-tenant travel commerce platform, architect scalable systems, orchestrate AI agents and feedback loops, own end-to-end features, collaborate with PMs and senior engineers, and improve codebase productivity for humans and AI.

The Software Engineer will develop features end-to-end in a Ruby on Rails application, collaborating with technical and clinical teams while maintaining a focus on user outcomes and code quality.

The Test System Software Engineer will develop and maintain automated test systems, troubleshoot test failures, and improve production processes while collaborating with multiple engineering teams.

The Senior Back-End Software Engineer designs, develops, and maintains scalable backend systems while taking ownership of the software development lifecycle.

The role involves leading compliance quality initiatives, designing test automation frameworks, collaborating with teams, and ensuring compliance in software development.

As a Software Engineer, you will design, develop, and maintain software solutions, collaborating with teams in an agile environment while ensuring quality and security in your code.

Responsibilities include building and maintaining backend services for distributed applications, requiring functional programming with Scala and TypeScript, alongside client interactions.

As a Software Engineer at Canonical, you will design, build, and ship software, improve packaging and distribution processes, and mentor colleagues while contributing to open source projects.

The Junior Ubuntu Software Engineer will design, build, and ship software, focusing on quality and resilience, while engaging with the open source community.

Lead design and delivery of core platform services (orders, baskets, checkout, promotions). Drive architecture, reliability, performance tuning, incident response, CI/CD and infrastructure improvements. Mentor engineers, coordinate cross-team initiatives, and contribute hands-on code to scalable, distributed microservices.

As a Software Engineer, you will design and develop applications, write clean code, engage in code reviews, optimize systems, and explore new technologies in a remote team.

We are seeking 2025 and 2026 Graduate Software Engineers to join Canonical's teams focused on open source software. Responsibilities include product roadmapping, coding in various languages, engaging with the community, and ensuring high-quality performance. Candidates should have an exceptional academic track record and experience with Linux.

As a Senior Software Engineer, you will build scalable distributed systems, improve developer experience, mentor peers, and lead incident responses.

Develop and maintain NedGraphics cloud collaboration platform and integrations. Build serverless AWS backends, secure REST APIs and event-driven workflows, optimize performance, enforce security best practices, implement automated tests, and produce technical documentation for third-party and internal integrations.

Develop and maintain NedGraphics cloud products and OptiNedLink, build serverless AWS backends, implement secure REST APIs and event-driven workflows, create integrations with third-party systems, optimize performance, enforce security best practices, and produce developer-facing documentation and automated tests.

Develop and maintain NedGraphics cloud platform (OptiNedLink). Build serverless AWS backends, secure/versioned REST APIs and event-driven workflows, integrate third-party/ERP/PLM systems, implement automated testing, optimize performance, enforce security best practices, and produce technical documentation.

Design, build, test and maintain modern software applications using C#/.NET. Contribute to architecture and technical decisions, mentor junior engineers, apply security, scalability and performance best practices, and collaborate on estimation, product planning and requirement creation.

Lead and technically own software products: design, build, test, and maintain scalable, secure C#/.NET applications. Provide technical leadership, architecture, estimation, CI/CD delivery, and coach/develop junior engineers while interacting with customers and mentoring the team.

Work as part of an agile team to design, develop, document and test frontend features for a mission-critical call-taking and dispatch platform. Build high-quality JavaScript/React/TypeScript user interfaces, collaborate with product and test engineers, follow modern development practices (SOLID, Git, pull requests), and support an expansion product while occasionally travelling to UK offices.

Join Uncountable's Implementations Engineering team to build software that integrates R&D lab instruments with their platform, working closely with customers and developing automated data pipelines.

The role involves designing and maintaining scalable software platforms, troubleshooting complex problems, mentoring engineers, and establishing best practices to ensure software integrity.

As a Backend Software Engineer, you'll develop and maintain REST APIs using Django, manage cloud infrastructure, and oversee CI/CD pipelines to support consumer fintech applications.