Toast

Principal Software Engineer - AI Foundations

Toast
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5 months ago
Dublin, IrelandStaff+

Responsibilities

  • Define and drive the technical architecture for the AI Foundations platform across backend services, frontend tooling, and third-party integrations.
  • Lead full-stack design and delivery for the LLM Proxy, AI Key Management, observability pipelines, and internal plugin marketplace.
  • Architect and deliver autonomous agents and MCP services that participate in the software development lifecycle.
  • Establish engineering standards for code quality, system design, testing, and operational practices.
  • Mentor and technically lead engineers through design reviews, code reviews, and pairing.
  • Partner with product and platform leadership to shape the AI Foundations roadmap and translate strategy into technical plans.
  • Collaborate with designers and product teams to deliver polished, production-ready frontend experiences.
  • Represent AI Foundations in cross-team architecture and engineering decisions.

Requirements

  • 10+ years of experience designing and delivering scalable software systems with a strong full-stack background.
  • Demonstrated experience leading technical architecture for a platform, product, or engineering team.
  • Proven ability to mentor engineers and raise engineering standards through reviews, guidance, and hands-on leadership.
  • Experience building, deploying, or operating LLM-powered agents or AI platform infrastructure.
  • Familiarity with AI coding assistants such as Claude Code, Cursor, or GitHub Copilot, including extending them through custom plugins, skills, or hooks.
  • Experience with MCP, tool-use patterns, or agentic frameworks.
  • Strong foundation in backend technologies such as Java or Kotlin and frontend technologies such as TypeScript or React.
  • Preferred: familiarity with A2A protocols, multi-agent orchestration, machine learning concepts, model evaluation, ML infrastructure, developer experience platforms, internal tooling, and AI/LLM observability tools such as Langfuse or DataDog.
  • Comfort working in a rapidly changing technical landscape and acting decisively.

Benefits

  • Hybrid work model with a minimum of two days per week in the Dublin office.
  • Benefits and total rewards package focused on competitive programs, healthy lifestyles, and flexibility.
  • Accessible and inclusive hiring process with reasonable accommodations available.
Toast

About Toast

5,001-10,000 employees

Toast builds an all-in-one, cloud-based POS and restaurant management platform combining software, Android-based terminals, and integrated payments for restaurants. Revenue comes from SaaS subscriptions, hardware sales, and payment processing, with add-ons such as online ordering, delivery integrations, and payroll. Founded in 2011 and headquartered in Boston, it is a public company on the NYSE serving single-location eateries to multi-unit groups across the U.S. and expanding internationally.

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