Principal Software Engineer, Data Platform

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.

We are hiring a Principal Software Engineer to join our data platform (AAP) team in Dublin. The AAP team owns the foundational data infrastructure that powers Toasts analytics products and AI/ML capabilities: real-time streaming pipelines a cloud-native data lakehouse feature serving for ML-driven product experiences and the infrastructure that enables product teams across Toast to build intelligent data-driven experiences for our 170000 restaurant customers.

We are in the middle of a significant platform evolution: migrating to Apache Iceberg standing up a new Feature Store and scaling our streaming infrastructure to meet the demands of a rapidly growing business.

As a Principal Software Engineer youll contribute to the technical strategy for our most critical data platform initiatives - deep hands-on work with Spark and Iceberg driving architectural decisions grounded in how these technologies actually behave under load and helping shape the platforms touch points with the same care youd bring to an external product. Youll work closely with other senior engineers and technical leads influence adjacent teams and mentor engineers across the organisation - articulating technical direction clearly to engineering product and leadership and bringing people along through a significant platform transformation. Success looks like other engineering teams moving faster because of the platform you help build.

A day in the life (Responsibilities)

• Work hands-on with Spark Iceberg and our streaming infrastructure - diagnosing performance reasoning through architectural decisions and building systems that other teams depend on at scale
• Contribute to technical strategy for data platform initiatives alongside other senior engineers and technical leads translating complex problems into clear direction and executable plans
• Design and evolve the platforms API surfaces so that engineers across Toast can self-service - adoption and ease-of-use are part of the job
• Influence adjacent teams and align stakeholders across engineering product and leadership on architectural decisions
• Mentor engineers on the team and raise the bar on engineering practices across the organisation
• Use AI tooling as a genuine force multiplier in your day-to-day work and help the team do the same

What youll need to thrive (Requirements)

• 8 years in software engineering with meaningful experience in data platform or distributed systems
• Deep expertise in Apache Spark and Apache Iceberg not just operational familiarity
• Strong background in streaming infrastructure (Apache Kafka Apache Pulsar or similar) and cloud-native data platforms on AWS
• Experience designing internal platforms and developer-facing abstractions - you think about your platforms users as carefully as product engineers think about end users
• Demonstrated ability to drive technical alignment across multi-team environments including the communication work that makes architectural changes actually stick
• Databricks experience is a bonus but we care more that you understand whats running underneath it

Our tech stack

Our data platform runs on AWS and spans Apache Iceberg for table format and lakehouse architecture Apache Kafka and Pulsar for real-time streaming Apache Spark for data processing and DynamoDB and Postgres for operational data stores. We are migrating from legacy ETL patterns toward a modern cloud-native data lakehouse and building out Feature Store capabilities to power ML-driven product experiences. Our backend services are primarily Kotlin and Java.

**This is a hybrid role requiring in-office collaboration two days per week in ourDublin 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: 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: 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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