Adam D'Arcy
Principal Engineer · Systems Architect · Engineering Leader
My work sits at the seam between three fields that increasingly need each other: human-computer interaction, artificial intelligence, and cybersecurity. I came to this intersection through years of building production systems and noticing that the interesting failure modes are rarely purely technical.
At Workday I architected the Deployment Intelligence multi-agent system — reducing enterprise implementation time by up to 25% within the first six months — and previously led the Chameleon UI Platform, which grew delivery capacity by 280% while reducing resourcing by a third. Across both, I worked alongside product, UX, research, cybersecurity, legal, privacy and senior leadership to ship systems that hold up in the real world.
I'm a recognised researcher in HCI, cybersecurity and AI with publications and presentations internationally — and a champion for LGBTQ+ representation and diversity in technology, committed to building inclusive platforms and engineering cultures where all contributors can do their best work.
In practice, I bring all of this to startups: helping them design architectures, ship AI features responsibly, and avoid the well-documented mistakes the literature has already mapped.
Experience
Principal Engineer · AI, Deployment Intelligence
2024 – Present
Workday
- Architected Workday's Deployment Assistant — the architectural baseline for enterprise AI across the organisation. Layered UI/API/RAG/AI stack in TypeScript, React, Python, Scala and LangChain with shift-left security, privacy and governance.
- Led a cross-functional team (frontend, AI/ML, product) through full lifecycle delivery; introduced AI evaluation frameworks, usage and token telemetry, and shared architectural principles enabling parallel workstreams.
- Delivered multi-mode agent (Ask, Plan, Agent) with streaming, threads, citations, document upload and cross-tenant read/write across internal, external and MCP targets. Now serving 1,000+ subscriber organisations month-on-month.
Principal Engineer · Chameleon UI Platform
2017 – 2024
Workday
- Architect and lead for Workday's admin persona shared UI platform — adopted as the canonical admin UI foundation across 5 organisations and 15+ production projects.
- Designed the 3-layer Data / Domain / View architecture and a 100+ component TypeScript library; improved projects-per-capacity by 3.5× (280% more projects, 33% less resourcing) and onboarded 100+ developers.
- Set CI/CD standards (GitHub Actions, Snyk), an E2E testing strategy across 14 projects, and led early multi-agent AI PoC and delivery. Architect and developer of Workday's cybersecurity single-pane-of-glass front door and scorecard system.
Competencies
- Architecture & Platforms
- Enterprise platform strategy, monorepos, shared UI ecosystems, multi-tenant systems, microservices, API design, scalability.
- AI & Agentic Systems
- Multi-agent architecture, RAG systems, LLM integration, streaming UX, evaluation frameworks, governance, safe-by-design AI delivery.
- Security & Resilience
- Threat modelling, agentic/LLM attack surfaces, shift-left security, supply chain security, kill chain analysis, secure platform design.
- Engineering Leadership
- Cross-functional leadership, roadmap shaping, technical strategy, mentorship, standards governance, stakeholder alignment.
- UX, HCI & Design Systems
- Enterprise design systems, accessibility, component lifecycle management, user-centred architecture, HCI principles.
- Technical Execution
- TypeScript, React, Node, Python, JVM/Scala, GitHub Actions, Cypress, Vite/Vitest, CI/CD, telemetry, observability.
Education
MSc (Research), Cybersecurity
Technological University Dublin
2022 – 2024 · School of Informatics and Cybersecurity
BSc, Computer Science & Software Engineering
Maynooth University
2013 – 2017 · Department of Computer Science