Top Tech Jobs & Startup Jobs in Belfast

Coordinates Professional Services operations across the UK and Ireland, maintaining project portfolios, forecasts, billing, revenue, utilization, capacity, margins, backlog, dashboards, and KPI reporting. Supports Sales-to-Services handoffs, PMO governance, risk escalation, leadership reporting, and cross-functional collaboration with project management, sales, finance, billing, and resource teams. The role also improves processes, data quality, and reporting efficiency.

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.

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.

Develop and maintain production software for large-scale, real-time advertising systems. Responsibilities include writing tested code, addressing features and bugs, supporting production services, collaborating across teams, and contributing to system architecture and design. The role emphasizes systems programming, scalability, low-latency performance, concurrency, memory management, and reliable enterprise server applications, with opportunities to develop production Rust skills.

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

Lead complex, cross-functional transformation programs from planning through execution. Define requirements, target operating models, delivery controls, and actionable recommendations while partnering with Technology and senior stakeholders. Drive process improvement, manage matrixed teams, challenge deliverables, communicate outcomes, and ensure accountability for program performance. Develop reusable consulting knowledge and coach junior staff as needed.

Leads development and optimization of complex Ab Initio ETL applications supporting Citi’s Oracle General Ledger. Collaborates with finance users and technology teams, manages the SDLC in Agile environments, investigates data issues using SQL and Oracle, develops automation utilities, performs testing, supports implementations, and resolves production defects. The role requires technical leadership, strong financial technology experience, and expertise in data engineering, RDBMS, UNIX, shell scripting, and Jira.

Develop scalable full-stack financial applications using Java or Python, backend frameworks, modern JavaScript, and cloud platforms. Design application architecture, coding and testing standards, and system enhancements. Integrate generative AI APIs and technologies such as LLMs, vector search, prompt engineering, and agent workflows. Analyze complex technical and business problems, manage risk and compliance, and mentor mid-level developers and analysts.

Conduct independent third-party audits across multiple industries, gathering objective evidence, preparing impartial reports, leading opening and closing meetings, and maintaining client relationships. The role includes a structured 12-week training program leading to qualifications in ISO 9001, ISO 14001, and ISO 45001. Candidates need relevant hands-on operational experience, strong communication and analytical skills, accurate report-writing ability, willingness to travel regionally and nationally, occasional overnight availability, and a full UK driving licence.

Manage global mobility tax advisory and compliance services for internationally mobile employees and multinational clients. Responsibilities include UK expatriate tax, PAYE, payroll, social security, tax returns, cross-border assignments, HMRC correspondence, client portfolio management, budgeting, team leadership, business development, and coordination with international tax professionals.