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.

Design and coordinate electrical services for data centre projects, managing delivery on small and mid-sized projects and assigned components of larger projects. Provide technical input, develop client solutions, prepare proposals and feasibility reports, attend coordination and site meetings, and liaise with clients, contractors, suppliers, and multidisciplinary teams. The role requires data centre or industrial facilities experience, professional accreditation, relevant electrical engineering qualifications, and willingness to travel.

Leads AECOM’s data center construction administration team across the UK, overseeing multidisciplinary technical services, mechanical delivery, design changes, responsible designer services, client and contractor coordination, project risks, KPIs, commercial performance, and team development. The role also supports business development, work winning, thought leadership, and strategic growth across hyperscale and colocation data center markets in EMEA and globally.

Leads digital delivery for hyperscale data centre projects, implementing BIM execution plans, ISO 19650 standards, common data environments, multidisciplinary coordination, model quality controls, and digital reporting. Oversees regional and global teams, manages project information and deliverables, monitors KPIs, supports 3D/4D/5D integration and digital handover, and identifies automation and AI opportunities. The role also engages clients and stakeholders, resolves delivery issues, contributes to bids and resource planning, and supports training and knowledge sharing.

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.

Design and develop fire control and air defence systems across the full lifecycle. Responsibilities include requirements capture, system architecture, interface and behavior definition, technology evaluation, trade studies, prototyping, integration, fault diagnosis, verification, compliance, documentation, and mentoring junior engineers. The role collaborates with multidisciplinary teams to deliver complex, mission-critical defence capabilities.

Leads Kainos’ Employee Relations team and oversees complex casework, employment-law guidance, service standards, stakeholder advice, and continuous improvement. The role manages team capability, supports senior leaders, ensures consistent case handling across jurisdictions, and uses technology, data, and automation to improve employee and manager experiences. It also requires advising on organizational change, litigation, investigations, documentation, policies, and employee relations processes.

Develop and maintain high-quality software applications across multiple layers, applying secure, scalable, and performant development practices. Contribute to architecture, estimation, product planning, and requirements creation. Make technical decisions collaboratively, troubleshoot live applications, mentor junior engineers, and support continuous learning and knowledge sharing.