Top Software Engineer Jobs in Belfast

As a Software Engineer at Canonical, you will collaborate globally to shape open-source software operations, focusing on Python and Golang development, enhance DevOps workflows, and improve infrastructure operations for cloud computing solutions.

The role involves designing and delivering open source software operations code in Python, ensuring system reliability, and collaborating with teams across the Linux stack.

As a Software Engineer, you will build features, write maintainable Roblox Lua code, collaborate with teams, and enhance gameplay for millions of players.

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 Software Engineer will design, develop, and install software solutions, focusing on web applications using PHP and ensuring coding standards and technical design compliance.

The Backend Software Engineer will manage the lifecycle of short-term projects, perform reliability analysis on applications, and interface with teams to deliver features.

Sell SaaS software by conducting discovery, scoping solutions, creating customized customer demonstrations, and explaining product value, ROI, and AI capabilities. Prepare RFIs and RFPs, answer technical questions, support upsell and cross-sell opportunities, and collaborate with sales, marketing, implementation, and product teams. Maintain expertise in the platform, AI-enabled SaaS functionality, food industry challenges, and relevant regulations.

Designs, develops, and maintains scalable backend services, APIs, and data capabilities for analytics, dashboards, and visualizations. Responsibilities include processing and aggregating structured and unstructured data, optimizing performance, collaborating with frontend, data, UX, product, and DevOps teams, and supporting reliable production deployments. The role also involves technical design, testing, monitoring, troubleshooting, code reviews, and continuous improvement of analytics services.

Leads end-to-end modernization from a monolith to microservices, including legacy analysis, architecture, estimation, data migration, deployment, and production support. Guides .NET services, databases, messaging, containerization, and frontend integrations. Acts as the technical escalation point for complex issues while improving Jira tracking, estimation accuracy, QA collaboration, release predictability, and engineering processes. Manages and develops the team through one-on-ones, performance reviews, feedback, and career-focused objectives.

Leads the design, development, deployment, and support of high-traffic full-stack applications and APIs. Responsibilities include architecture, infrastructure, monitoring, CI/CD, database development, documentation, production troubleshooting, code review, technical strategy, mentoring, and cross-team project delivery. The role owns solution design, influences engineering standards, and supports scalable, fault-tolerant systems in an Agile environment.

Designs and develops high-traffic, scalable software systems and data processes across multiple teams. Owns technical strategy, architecture, engineering standards, reliability, security, QA, infrastructure, and deployment practices. Leads solution design, evaluates technologies, resolves cross-team technical risks, mentors engineers, reviews code, supports live applications, and influences long-term technology decisions while partnering with product and business stakeholders.

Lead and deliver full‑stack features for international direct‑to‑consumer products. Collaborate with product, design, and analytics; own operations, metrics, on‑call, code quality, and talent development while driving technical design and execution.

Lead design and build of API-first product platforms and high-scale APIs consumed by internal teams, external integrations, and AI agents. Drive API standards, reliability, observability, and scalability; develop agentic workflows and reduce systemic technical risk while mentoring senior engineers.

Architect and build Proofpoint’s Satori enterprise AI agent platform, including agent runtimes, SDKs, evaluation suites, safety checks, telemetry, authentication, observability, and deployment controls. Develop reusable platform capabilities, ship production-grade microservices, debug distributed systems, collaborate across global teams, lead architectural discussions, mentor engineers, and participate in on-call support.

Full-stack AI/ML Software Engineer to build HealthTech SaaS microservices, implement and integrate ML solutions, write high-quality code, author documentation, perform code reviews, and act as an SME on services and systems.

Design, build and maintain backend services for multiplayer games. Implement distributed systems, CI/CD, containerised microservices, databases (SQL/NoSQL), cloud infrastructure, and documentation. Collaborate on estimates, support teammates, and ensure high-quality deployments and operational standards.

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

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 Mark43's AI-enabled engineering initiative by designing and orchestrating multi-agent systems that plan, write, review, test, and deploy software. Write prompts, scaffolding, and tool integrations (VCS, test runners, internal APIs), evaluate agent performance, prototype LLM-based workflows, collaborate cross-functionally, mentor teammates, and contribute to on-call rotations.

Designs, develops, and operationalizes large-scale backend, API, graph, AI, and machine learning solutions. Responsibilities include technical leadership, cloud-native architecture, roadmap development, testing, code reviews, mentoring, recruitment, stakeholder communication, and improving engineering processes. The role requires extensive Java and Spring experience, AWS cloud development, RESTful APIs, stream processing, low-latency applications, generative and agentic AI, and strong software delivery practices.

Build and productionize tooling that compiles complex Python packages such as NumPy, SciPy, and PyTorch from source. Develop conda recipes, build tools, automation, and release processes; partner with packaging and distribution teams; mentor engineers; and lead postmortems, capacity planning, and incident response. The role also shapes technical strategy, architecture, project scope, and delivery decisions for build and distribution infrastructure.

Design and build GitLab Duo CLI features in TypeScript, shape AI-assisted developer experiences, improve CLI reliability, observability, and performance, collaborate across Developer Clients, and provide technical leadership and mentorship.

Design and operate scalable backend services for the complete customer order lifecycle, including creation, fulfilment, and completion. Build Java or Kotlin microservices, GraphQL and REST APIs, and Kafka-based event-driven workflows across payments, pricing, and fulfilment. Develop resilient, low-latency systems using distributed databases, caching, and modern architecture patterns while collaborating with product, engineering, architecture, and business stakeholders.

Design, build, and operate scalable backend services for the complete customer order lifecycle. Develop Java/Kotlin microservices, GraphQL and REST APIs, and Kafka-based event-driven workflows supporting high-volume transactional systems across payments, pricing, and fulfilment. Apply distributed systems, caching, resilience, and low-latency architecture patterns while collaborating with product, engineering, architecture, and business stakeholders.