ToastR & D : Cloud Service Infra : AI Foundations

Principal Software Engineer - AI Foundations

Dublin, IrelandFull-timePrincipalSalary: Not disclosed
Posted Sep 2, 2026Deadline: Keep Open
Job SnapshotActively hiring
LocationDublin, Ireland
Job typeFull-time
SalaryNot disclosed
DeadlineKeep Open

Finjobsly Role Intelligence

Experience level
Principal
Work style
Hybrid
Visa sponsorship
Not specified
Salary
Not disclosed
Key skills
TypeScriptJavaReactMachine Learning

Get AI match insights

See your fit score & personalized tips.

Sign In Now

Before you apply

Company insights

67

Happiness score

67/100

Based on 19 verified employee signals

Toast reports $154M Q2 net income as ARR reaches $2.4B

Q2 2026 revenue rose 23% year over year to $1.91B. Toast added about 9,500 net locations, grew ARR 25% to $2.4B and reported $154M in net income.

Toast debuts AI-powered Toast IQ Grow marketing suite

Toast introduced Toast IQ Grow with an AI Marketing Agent, a redesigned Toast Local app and more than 20 updates spanning marketing, payroll, inventory and operations.

May 2026From the webToast Newsroom

Toast launches unified enterprise drive-thru platform

Toast Drive-Thru combines POS software, kitchen displays, digital menu boards, hardware, services and AI voice-ordering integrations for quick-service restaurant chains.

April 2026From the webToast Newsroom

Toast appoints Rossana Niola chief accounting officer

Toast's board appointed former Mastercard executive Rossana Niola as chief accounting officer and principal accounting officer, succeeding CFO Elena Gomez in the interim accounting roles.

AI Generated Insights

Finjobsly Intelligence— Generated from the employer's job description

What you'll own

Define and drive the technical architecture for the AI Foundations platform, leading full‑stack design and delivery of LLM proxies, AI key management, observability pipelines, and internal plugin marketplace.

What they're looking for

10+ years of full‑stack engineering experience, proven platform architecture leadership, and hands‑on work with LLM‑powered agents or AI infrastructure, plus strong Java/Kotlin and TypeScript/React skills.

Why this role matters

The role shapes the core AI platform that powers reliable, scalable AI capabilities across Toast’s product suite, enabling the company to deliver next‑generation restaurant technology.

Best suited to

A senior engineer who thrives on setting technical direction, mentoring teams, and building both backend services and developer‑facing frontends while navigating fast‑moving AI landscapes.

Fintech requirements

Visa sponsorship: No
Work arrangement: hybrid

About this role

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 we'll deliver on their needs for today while investing in the experiences that will power their restaurant of the future.

AI Foundations is Toast's 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, you'll 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 you'll 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 we're 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; it’s 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 https://careers.toasttab.com/toast-benefits.

How 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. We ask that you complete interviews and assessments on your own, without real-time AI tools, recording, or transcription bots, unless we tell you otherwise in advance. To learn more: https://careers.toasttab.com/ai-in-hiring

Our Approach to Hybrid Working

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 hospitality community, regardless of location. Please visit the Locations page on our career site to learn more about our in-office expectations by region: https://careers.toasttab.com/locations-toast

People Are the Secret Ingredient in Our Recipe for Success

At Toast, our employees are our secret ingredient—when they thrive, we thrive. The restaurant industry brings together people with a wide range of backgrounds, experiences, and perspectives, and we value that same breadth at Toast. We strive to build a culture grounded in authenticity, respect, and humility, where every Toaster has a real opportunity to grow, contribute, and do their best work—raising the bar in delivering exceptional experiences for our customers and each other.

Apply 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 candidateaccommodations@toasttab.com.

------

For roles in the United States, it is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

More about this role

About company

Required skills

TypeScriptJavaReactMachine Learning