Senior Software Engineer, Voice AI

Toast is driven by building the restaurant platform that helps restaurants adapt, take control, and get back to what they do best: building the businesses they love. We are looking for a Senior Software Engineer to join the Voice AI Team.

On the Voice AI Team, our mission is to build and operate the voice platform that powers Toast and to ship novel applications on top of it that create real value across Toast's customer base. This is a greenfield space where the platform and its use cases are being defined together, and the work you do here will be foundational to how Toast uses voice AI for years to come.

As a Senior Software Engineer on this team, you'll take ownership of significant projects end-to-end: designing systems, driving execution across the team, and making the technical decisions that shape how the platform grows. You'll work closely with product, engineering, and stakeholders across Toast to turn ambiguous problems into reliable, scalable systems. Here’s what you’ll be doing:

• →Design, build, deploy, and maintain highly resilient and scalable backend services and applications supporting Toast's Voice AI platform
• →Lead complex, cross-cutting projects from design through production, owning outcomes and driving alignment across stakeholders
• →Shape the team's technical direction by making architectural decisions, defining patterns, and reducing complexity for the engineers around you
• →Build and evolve integrations with AI platforms and internal Toast systems, making pragmatic tradeoffs between speed, reliability, and long-term scalability
• →Design and implement observability, monitoring, and evaluation frameworks for AI-powered systems, using production data to understand and continuously improve system behavior
• →Advocate for engineering quality and best practices, raising the bar for the team and the broader organization
• →Mentor engineers at all levels through code reviews, design feedback, and technical guidance

• 5+ years of experience with object-oriented languages such as Java or Kotlin
• Basic familiarity with frontend development on small scale projects
• Bachelor’s degree in Computer Science, Software Engineering, Computer Engineering, or related field.
• Experience shipping complex, mission-critical production services and owning them long-term
• Track record of leading multi-person projects end-to-end, from design through rollout
• Deep understanding of distributed systems, scalability, and production reliability
• Experience building and reasoning about AI-powered systems, including nondeterminism, evaluation strategies, observability, and cost management
• Experience developing AI-integrated products or features, with a practical understanding of how to ship and iterate on systems that incorporate LLMs or other AI capabilities
• Strong cross-team communication and collaboration skills; able to influence direction without formal authority
• Actively uses AI coding tools (e.g., Claude Code, Cursor) in day-to-day development
• Experience with voice or conversational AI platforms is a plus, but not required

Our backend services follow a microservice architecture written in Kotlin and Java using DropWizard, running on AWS (DynamoDB, RDS, Lambda). We store data in sharded Postgres databases and have our own platform for user management, canary deployments, and load balancing. Our web front-end is built with React and ES6.

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.

At Toast, our employees are our secret ingredient—when they thrive, we thrive. The 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: https://careers.toasttab.com/locations-toast.

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.

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