Principal Software Engineer AI Foundations

Toast creates technology to help restaurants and local businesses succeed in a digital world helping business owners operate increase sales engage customers and keep employees happy. Because our technology is purpose-built for restaurants by restaurant people - and increasingly shaped by AI in both what we build and how we build - restaurants can trust that well deliver on their needs for today while investing in the experiences that will power their restaurant of the future.

AI Foundations is Toasts internal platform team for AI. We build the infrastructure governance and developer tooling that makes AI a reliable scalable force multiplier across the entire product development lifecycle. Our products include the LLM Proxy AI Key Management Observability pipelines the Claude Plugin Marketplace and autonomous agents that participate directly in the software development lifecycle.

As a Principal Software Engineer youll set the technical direction for how we design build and evolve these systems working full-stack across the agentic workflows that employees across Toast depend on every day. This role is for someone who can drive architecture raise the engineering bar across the team and stay hands-on building.

A day in the life (Responsibilities)

• Define and drive the technical architecture for AI Foundations platform spanning backend services frontend tooling and third party integrations
• Lead full-stack design and delivery across 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
• Set and uphold engineering standards across the team: code quality system design testing and operational practices
• Mentor and technically lead engineers across all levels through design reviews code reviews and pairing
• Partner with product and platform leadership to shape the AI Foundations roadmap and translate strategy into executable technical plans
• Collaborate closely with designers and product teams to translate UX concepts into polished production-ready frontend experiences
• Serve as a key technical voice in cross-team discussions representing AI Foundations in architecture decisions across Toast engineering

What youll need to thrive (Requirements)

• 10 years of experience designing and delivering scalable software systems with a strong full-stack background spanning backend services and frontend or developer-facing interfaces
• Demonstrated experience leading technical architecture for a platform product or engineering team
• Proven ability to mentor engineers and raise the technical bar of a team through standards reviews and hands-on guidance
• Experience building deploying or operating LLM-powered agents or AI platform infrastructure
• Familiarity with AI coding assistants (e.g. Claude Code Cursor GitHub Copilot) and experience extending them through custom plugins skills or hooks
• Experience with MCP tool use patterns or agentic frameworks
• Strong foundation in modern backend (Java Kotlin or similar) and frontend (TypeScript React or similar) technologies with demonstrated experience building user-facing product interfaces
• Comfort with a rapidly changing technical landscape and a bias towards action over analysis paralysis

What will make you stand out

• Familiarity with A2A (Agent-to-Agent) protocols and multi-agent orchestration patterns
• Experience with machine learning concepts model evaluation or ML infrastructure
• Experience building developer experience platforms or internal tooling
• Familiarity with observability tooling for AI/LLM systems (e.g. Langfuse DataDog)

**This role requires a minimum of two days per week in our Dublin office**

AI at Toast

At Toast one of our company values is that were hungry to build and learn. We believe learning new AI tools empowers us to build for our customers faster more independently and with higher quality. We provide these tools across all disciplines from Engineering and Product to Sales and Support and are inspired by how our Toasters are already driving real value with them. The people who thrive here are those who embrace changes that let us build more for our customers; its a core part of our culture.

Our Total Rewards Philosophy
We strive to provide competitive compensation and benefits programs that help to attract retain and motivate the best and brightest people in our industry. Our total rewards package goes beyond great earnings potential and provides the means to a healthy lifestyle with the flexibility to meet Toasters changing needs. Learn more about our benefits at Toast Uses AI in its Hiring Process

Throughout the hiring process our goal is to get to know you. We use AI tools to support our recruiters and interviewers with tasks like note-taking summarization and documentation of interviews to ensure they can be fully focused on your conversation. All hiring decisions are made by people. To learn more: Equity and Inclusion is Baked into our Recipe for Success

At Toast our employees are our secret ingredientwhen they thrive we restaurant industry is one of the most diverse and we embrace that diversity with authenticity inclusivity respect and humility. By embedding these principles into our culture and design we create equitable opportunities for all and raise the bar in delivering exceptional experiences.

We Thrive Together

We embrace a hybrid work model that fosters in-person collaboration while valuing individual needs. Our goal is to build a strong culture of connection as we work together to empower the restaurant community. To learn more about how we work globally and regionally check out: today!

Toast is committed to creating an accessible and inclusive hiring process. As part of this commitment we strive to provide reasonable accommodations for persons with disabilities to enable them to access the hiring process. If you need an accommodation to access the job application or interview process please contact .

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