Top Tech Jobs & Startup Jobs in Belfast

Defines Rapid7’s technical vision and architecture for LLM and agentic AI systems across security products. Leads model strategy, fine-tuning, post-training, inference optimization, evaluation standards, and high-risk initiatives. Builds critical training and inference code, resolves complex technical trade-offs, mentors senior engineers, and influences product and platform strategy. The role requires deep expertise in transformer-based models, PyTorch, distributed training, context engineering, model evaluation, scalable inference, classical ML, and production AI systems.

Lead the technical direction for LLM and agentic AI systems across Rapid7’s security products. Architect, fine-tune, evaluate, optimize, and deploy models at scale while establishing engineering standards for context engineering, inference, and release evaluations. The role remains hands-on with model and infrastructure code, leads complex design decisions, mentors senior engineers, and shapes cross-functional product and platform investments.

Monitors and triages alerts, conducts open-source research, identifies online threats and exposed personal information, coordinates PII removal, documents findings, and prepares risk assessment reports. The role also involves social media monitoring, client updates, escalation of complex issues, and applying cybersecurity, privacy, and intelligence principles while working onsite with the Belfast intelligence team.

Supports the planning, development, and improvement of aerospace manufacturing processes, tools, technologies, and production systems. Responsibilities include continuous improvement, waste reduction, automation and digital manufacturing initiatives, industrialisation of new products, production problem-solving, data analysis, and cross-functional collaboration with engineering, quality, operations, supply chain, and production teams.

Student placement software engineering role developing Magnite’s advertising platform. Responsibilities include software development, quality assurance, test automation, deployment, and solving complex technical problems with experienced engineering teams. The role provides mentorship and exposure to a broad technology stack, including Java, Rust, Scala, JavaScript, Python, C++, SQL, Cassandra, Druid, Hadoop, and Kafka.

Provide end-to-end production application support, including incident response, escalation management, monitoring, access and configuration changes, and client communication. Use AI tooling to investigate issues, build automations, and validate outputs. Collaborate with engineering on fixes, mentor teammates, and maintain runbooks and knowledge articles. The role requires strong skills in cloud platforms, APIs, databases, networking, operating systems, scripting, troubleshooting, and customer communication, with participation in an on-call rotation.

As a Senior Site Reliability Engineer, you'll build resilient platforms, automate processes, mentor teams, and drive changes in a cloud-based environment.

Develop and maintain high-quality C#/.NET applications across multiple layers. Apply secure, scalable, and performant development practices; contribute to architecture, estimation, product planning, and requirements. Mentor junior engineers, collaborate on technical decisions, troubleshoot live applications, and support continuous integration and delivery. Communicate effectively with technical and non-technical stakeholders while balancing user needs and commercial constraints.

Lead the design and delivery of Workday PRISM and complex reporting solutions for clients. Gather requirements, translate business needs into technical reports, configure and test dashboards, worksheets, calculated fields, and reporting products, and provide Workday best-practice guidance. Mentor junior consultants, collaborate with architects and product managers, manage stakeholders and deadlines, maintain certifications, and support reporting and analytics initiatives.

Lead mechanical engineering delivery for complex data centre projects across multidisciplinary and international teams. Provide technical leadership, collaborate across geographies, support permitting and construction methodologies, manage multiple projects, and contribute to AECOM’s data centre thought leadership and strategic growth. The role requires strong knowledge of building systems and regulations, client communication, digital design workflows, and data centre design and delivery.

Leads electrical engineering and construction administration for data centre projects. Responsibilities include project planning, technical design, specifications, estimating, cost control, reporting, client presentations, site inspections, contractor coordination, and multidisciplinary team leadership. The role also mentors engineers, supports proposals, manages deadlines, and delivers electrical solutions across medium- to large-scale projects.

Design electrical building services systems for commercial, healthcare, education, residential, industrial, and public infrastructure projects. Prepare calculations, specifications, reports, and BIM-based design documentation; coordinate with multidisciplinary teams; support projects from concept through handover; ensure regulatory compliance; attend client and site meetings; solve technical challenges; and mentor junior engineers while meeting quality, budget, and schedule requirements.

Lead business analysis for communications surveillance and regulatory technology initiatives. Gather requirements, map processes, define user stories, investigate data and control issues, coordinate testing, manage risks and dependencies, support platform operations, and contribute to product roadmaps. Collaborate with Compliance, Legal, Operations, Technology teams, and vendors across Agile and Waterfall delivery environments.

Lead DevOps modernization across global platforms by designing adoption strategies, engineering CI/CD automation, integrating testing, improving observability and production resiliency, and supporting cloud and on-premises application teams. The role provides hands-on technical leadership, drives containerization and serverless adoption, engages vendors, and promotes measurable productivity and delivery improvements through DevOps, SRE, Agile, and Lean practices.

Lead counterparty credit risk product and regulatory projects for traded-product markets. Develop and enhance exposure measurement, monitoring, reporting, and stress-testing tools covering NSE, PFE, settlement, and intraday risk. Manage product lifecycles, requirements, releases, UAT, impact analysis, data issues, and remediation plans while coordinating with business, risk, technology, compliance, and senior stakeholders.