Top Software Engineer Jobs in Belfast

Build and maintain scalable, reliable agentic AI systems for biomedical research, integrating LLMs, tool-calling, and data platforms. Drive technical decisions, optimize analytical workflows, deploy agents on the data platform, mentor teammates, and participate in on-call rotation to ensure performance, security, and continuous improvement.

Join Canonical as a graduate software engineer to write high-quality code across the open source stack, work on Linux system-level and application projects, engage with communities, respond to customer issues, and develop security-aware software while collaborating remotely and attending biannual in-person team sprints.

Analyze and optimize ClickHouse database performance, develop performance tests, support engineering teams, collaborate with core teams, and engage with the open-source community.

Customer-embedded principal software engineer driving production-grade solutions for strategic accounts. Translate business needs into technical designs, build and deploy end-to-end systems, influence senior stakeholders, and transition work to FDE crews. Operate in ambiguous, fast-paced environments with strong ownership, industry context, and an entrepreneurial mindset to deliver measurable business outcomes.

Lead the design and development of complex Rails features, mentor junior engineers, define technical direction, and ensure high-quality code while collaborating with stakeholders.

Design, develop, and scale a GenAI prompt security platform protecting AI and LLM applications from adversarial attacks and prompt injections. Build automated security testing frameworks, secure APIs, and enterprise software solutions. Collaborate with Engineering, Operations, Site Reliability Engineering, and cross-functional stakeholders. Contribute to architecture, reliability, scaling, containerized deployment, DevOps, CI/CD, and security operations.

Build and maintain full-stack features for customer and internal web apps, design backend APIs for onboarding and transactions, integrate third-party services, implement OAuth2 authentication, operate in a microservices AWS environment, ensure security, performance, observability, participate in code reviews and architecture, and write technical documentation.

Design, develop, and maintain web applications, Python middleware, and automation for BEAR research computing. Deploy and operate services on Linux/BEAR Cloud, improve CI/CD and testing, integrate systems (e.g., GitLab, ServiceNow), support users, participate in triage/housekeeping rotas, and collaborate on technical design and engineering practices to improve reliability and scalability.

Build and maintain the Internal Engineering Platform and CI/CD systems to help internal teams release software reliably. Automate build/release/deploy processes, manage artifact and configuration tooling, integrate observability, operate platform services (on-call), and collaborate with security and application teams to drive developer productivity.

Develop and maintain the backend ecosystem for the Alta Video Management System, focusing on cloud-based distributed systems and coding quality.

Lead the design and implementation of core authentication infrastructure at Phantom, focusing on secure authentication systems, secrets management, and API integrations.

As a Software Engineer, you'll develop trading APIs and systems, enhance user experiences, and lead initiatives for blockchain support and new products.

As a Software Engineer - L3 Support, you will resolve complex Ubuntu-related issues, collaborate with teams, and participate in upstream communities to drive bug fixes and improvements.

As a Software Engineer, you will resolve complex customer issues related to Ubuntu and open source software, participate in upstream communities, and develop and review code across multiple layers of the software stack.

The Senior Software Engineer will lead the design and management of cloud infrastructure, automate systems, ensure security, and enhance developer experience while mentoring the team.

Develop and maintain enterprise applications using Camunda BPMN, Java and Spring Boot. Implement front-end features with Angular/Vue/React, integrate microservices, use source control and IDEs, write documented and tested code, and work independently in cloud-based environments. Containerization and orchestration (Docker/Kubernetes) are advantageous.

Design, build, test, deploy and run full‑stack SaaS features using Node.js, TypeScript and React. Participate in design, code reviews, pairing, refactoring, API and backend development, ensure security, reliability and accessibility, and support production monitoring and agile delivery.

As a Senior Software Engineer at KoBold, you'll develop innovative data systems for mineral exploration, collaborating closely with geologists and data scientists to improve exploration success rates. You'll own projects end-to-end, engage with users, and create scalable, production-quality solutions for complex geological challenges.

Senior full‑stack engineer responsible for designing and delivering scalable, cloud‑native applications using Java or Python. Solve complex business problems, set coding standards, mentor mid‑level developers, integrate Gen‑AI capabilities (LLMs, prompt engineering, vector search) and third‑party Gen‑AI APIs, and collaborate with management to deploy new products while ensuring compliance and risk controls.

Lead Systems Engineer responsible for designing, implementing, and maintaining PLC/SCADA automation systems, industrial networks, and OT cybersecurity. Provides technical leadership, mentors teams, oversees system architecture, commissioning, risk assessments, and vendor/client coordination to deliver secure, standards-compliant projects on time and within budget.

Work on an agile team building and maintaining mission-critical call-taking and dispatch software. Develop, document, and test features across frontend and backend using modern practices, collaborate with product and test engineers, and lead development for expansion products. Obtain required UK security vetting.

Owner of the asset discovery experience across tokens, perpetuals, and prediction markets. Design, build, and scale features for web, mobile, and browser extension platforms. Lead initiatives to add blockchain support and new products, interface with users and developers for feedback, and help grow and hire a high-performing Discovery team.

Design, build, and maintain scalable backend systems and APIs using Go/Python. Integrate enterprise services, data pipelines, event-driven tech (Temporal, Kafka), and LLMs (OpenAI, Gemini, Claude). Ensure security, high availability, multi-tenant SaaS deployments, and improve engineering practices across the stack.

Develop microservices and cloud services for Magnify's platform, collaborate with data science, and lead complex software projects in a startup environment.

Design, develop, and deliver back-end, distributed, real-time systems using .NET/C#. Own feature delivery throughout the SDLC, champion engineering best practices, collaborate with QA and architects, use CI/CD and cloud (AWS), mentor junior engineers, and evaluate technologies including AI-enabled tools to ensure scalable, resilient production systems.