Senior Android Engineer – Payments, Kotlin and Security

Toast; Ireland; On-site; EUR 110,000 - 140,000; Full time

Benefits offered by this job

Unlimited Vacation

Sabbatical after five years

Professional Development Reimbursement

Wellness Stipend

Recognition programs

401(k) and matching

Medical, Dental, & Vision Coverage

Subsidized backup childcare

Mental Health Benefits

Peer recognition programs

Job summary

Toast is seeking a Senior Software Engineer for the Card Readers team to ensure fast, reliable, and secure processing of millions of payments. You’ll design, develop, and maintain our POS payment integrations and work with hardware SDKs, the core POS app team, and cross-functional partners to drive architecture decisions.

You’ll specialize in high‑throughput asynchronous JVM solutions using Kotlin, mentor peers, lead performance and security best practices, and help shape development at Toast

Qualifications

• Excellent communication and collaboration across teams.
• Deep knowledge of multi-threading/concurrency and Kotlin/JVM.
• Experience with Android projects, modular architectures, and testability.
• Observability, monitoring, and alerting for complex interactions.
• SDK integrations with card payments and EMV experience.
• Security and PCI-DSS awareness; adherence to best practices.
• Mentoring developers, conducting code reviews, and guiding teams.

Responsibilities

• Design, develop, and maintain POS payment integrations.
• Collaborate with hardware SDKs, core POS app team, and cross-functional partners.
• Lead technical discussions on performance, security, and best practices.
• Triage issues and ensure high availability and reliability.
• Participate in agile processes and drive architectural decisions.
• Stay up to date with emerging technologies and trends.

Skills

High-throughput JVM

Kotlin

Security best practices

Code reviews

Multithreading / Concurrency

Observability

Android project experience

SDK integrations

Tools

Hardware SDKs

Job description

Toast is seeking a Senior Software Engineer for the Card Readers team to ensure fast, reliable, and secure processing of millions of payments. You’ll design, develop, and maintain our POS payment integrations and work with hardware SDKs, the core POS app team, and cross-functional partners to drive architecture decisions.

You’ll specialize in high‑throughput asynchronous JVM solutions using Kotlin, mentor peers, lead performance and security best practices, and help shape development at Toast