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.

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.

Manage transformation, change, and implementation projects for public sector clients. Responsibilities include coordinating workstreams, managing stakeholders, maintaining governance and project documentation, conducting research and data analysis, developing recommendations, preparing client deliverables, managing risks, contributing to proposals, and mentoring junior colleagues.

Finance partner for the Belfast site leadership team, overseeing accounting operations, financial reporting, planning, controls, compliance, inventory reporting, systems improvements, and statutory filings. Manages the finance and accounting team, supports manufacturing and product introduction projects, ensures US and UK GAAP compliance, and drives process standardization. The role requires strong technical accounting, international experience, finance business partnering, and familiarity with multi-currency and manufacturing environments.

Develop and deliver complex full-stack .NET solutions across the software development lifecycle in a fintech SaaS environment. Responsibilities include architecture, implementation, testing, deployment, requirements refinement, planning, bug remediation, and feature ownership. The role also emphasizes AI-enabled engineering through coding assistants, custom agents, skills, harnesses, prompts, evaluations, and guardrails. Candidates will collaborate with senior engineers and support teams while contributing to scalable, high-quality software.

Analyze and approve pricing deals, build dashboards and financial models, evaluate AI monetization and packaging strategies, benchmark competitors, support SKU rationalization, and create pricing enablement materials. Partner cross-functionally with Sales, Product, Marketing, Finance, Legal, and IT to deliver recommendations to senior leadership and execute pricing changes across a B2B SaaS portfolio.