Staff Full-Stack Software Engineer

Salary: £58,000 - 98,000 per year

Requirements:

• Able to work on-site four days per week at our Belfast office
• Extensive hands-on engineering experience developing large-scale systems using JavaScript, TypeScript, or similar
• Direct hands-on experience with and deep knowledge of React and TypeScript, plus one or more UI back-ends (Rails, Swing, Node, etc.)
• Micro-frontend (MFE) experience, or a desire to ramp into it quickly
• Cloud-native development experience, including automating deployments and familiarity with container systems; AWS experience is a plus
• A keen eye for design and user experience
• Ability to read API specs, identify gaps, and raise them early
• Awareness of front-end security, web standards, and accessibility
• Strong debugging skills
• Excellent time management skills and comfort coordinating work with colleagues in the US and globally
• Excellent communication and leadership skills, including managing stakeholders and mentoring other engineers
• A proactive get-it-done attitude and willingness to move forward through uncertainty
• Readiness to participate in on-call rotation at times coordinated with US-based colleagues
• Interest in agent-generated UI (e.g. A2UI, json-render)
• BSc or MSc in Computer Science or related field, or equivalent experience
• Experience with AI-driven development (e.g. Claude Code, Codex) and agentic communication protocols (e.g. A2A, MCP) preferred
• Large-scale event processing experience is a plus, but not required

Responsibilities:

• Set the technical direction for Mission Controls UI across the full stack, including the React front end, the APIs behind it, and the automation that deploys and tests the work
• Act as the integrator across product, design, and backend teams
• Bring Figma designs to life
• Surface gaps early and proactively unblock others
• Build the experience that turns powerful agents into a product customers trust at enterprise scale
• Help create a product that is transparent, controllable, and dependable 24/7/365

Technologies:

• AI
• AI Agents
• API
• AWS
• Backend
• Claude Code
• Cloud
• Figma
• Frontend
• JSON
• JavaScript
• MCP
• Rails
• React
• Security
• Swing
• TypeScript
• Web
• UX UI Design
• NodeJS
• Office 365
• Fullstack

More:

We are Proofpoint, a global leader in human- and agent-centric cybersecurity, protecting how people, data, and AI agents connect across email, cloud, and collaboration tools. Our mission is to safeguard the digital world and empower people to work securely and confidently. We are hiring a Staff Full Stack Engineer for Satori, our enterprise AI agent platform, to help build Mission Control for our Fortune 500 customers. This is a high-ownership, fast-paced, and highly collaborative role with significant transformational impact. We offer competitive compensation, comprehensive benefits, career success on your terms, a flexible work environment, annual wellness and community outreach days, recognition for contributions, and global collaboration and networking opportunities. The role is based in Belfast, Northern Ireland, and is full time.

last updated 36 week of 2026