Principal Engineer, Card Readers Team

Toast

Principal Engineer leading payment integration solutions at Toast for the Card Readers Team. Designing, developing, and maintaining robust payment systems and applications with a focus on collaboration.

Posted 6/8/2026full-timeRemote • 🇺🇸 United StatesLead💰 $230,000 - $368,000 per yearWebsite

Tech Stack

Tools & technologies

AndroidJavaKotlin

About the role

Key responsibilities & impact

Develop and execute technical strategies to solve complex business challenges, leveraging data and customer insights to prioritize impactful improvements
Establish guiding technical and delivery principles that influence engineering practices across the broader engineering organization
Architect, design, and develop robust, high-performance applications using Kotlin, optimized for security, speed, availability, and reliability
Raise the bar as a high-throughput, hands-on code contributor modeling high standards
Lead agile development processes, including sprint planning, daily stand-ups, and retrospectives
Mentor and guide engineers, fostering a culture of continuous improvement, inclusivity, and engineering excellence
Build and maintain strong partnerships across lines of business, aligning technical solutions with strategic objectives
Leverage cutting edge AI tools to enhance your development workflow, improve velocity, and help pioneer new approaches to building - contributing to a culture of innovation and productivity across the team.

Requirements

What you’ll need

Demonstrated ability to lead large, cross-team platform initiatives, setting technical direction beyond a single team or service
Expert-level proficiency in Kotlin, Java, and/or JVM languages, including high-scale successes with multi-threading/concurrency (deep experience with coroutines a plus)
Fluency with card payments, particularly EMV standards and technology
Experience working in a large (Android) project/codebase, architecting for clear domain boundaries, modularity, reusability, and testability
Track record of complex and robust SDK integrations completed successfully
Expertise in security and key management best practices
Experience designing public APIs for hassle-free consumption
Expertise in observability, monitoring, and alerting for complex user-device interactions
Strong skills in mentoring a team of developers on best practices
Openness and enthusiasm for AI tooling to enhance R&D productivity
Excellent communication, collaboration, and problem-solving skills that lead others by example.

Benefits

Comp & perks

Competitive compensation and benefits programs
Cash compensation (overtime, bonus/commissions if eligible)
Equity and benefits

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

KotlinJavaJVM languagesmulti-threadingconcurrencycoroutinesSDK integrationssecurity best practicespublic APIsobservability

Soft Skills

mentoringcommunicationcollaborationproblem-solvingleadershipcontinuous improvementinclusivityengineering excellenceinnovationproductivity