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Software Engineer (Java, SQL)

Wiraa

Salary not specified
Oct 12, 2025
Remote, US
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Square is looking to build and maintain systems that power Square Debit Cards, define the technical strategy for seller-facing card platforms, and develop scalable, reliable, and secure infrastructure to support its global seller ecosystem.

Requirements

  • 12+ years of experience in building and scaling large, distributed systems.
  • Proven track record of setting technical direction and delivering impactful solutions across multiple teams.
  • Expertise in backend engineering, with proficiency in Java, Kotlin, or similar languages.
  • Ability to quickly learn and adapt to new technology stacks.
  • Experience designing frameworks and platforms that serve as foundational components for other teams.
  • Strong mentoring skills with a history of elevating the technical capabilities of senior engineers.
  • Passion for building resilient, trustworthy systems in high-stakes domains such as payments or fintech.

Responsibilities

  • Define and drive the technical vision for seller-facing card systems, ensuring scalability across geographic markets and teams.
  • Lead integrations with digital wallets, third-party platforms, and card-on-file experiences within the Square ecosystem.
  • Architect resilient frameworks with comprehensive fallback and failover mechanisms to ensure high availability and reliability.
  • Develop shared infrastructure for incentives and rewards, enabling product teams to experiment and engage sellers effectively at scale.
  • Mentor and guide senior engineers, fostering best practices in design, reliability, security, and scalability.
  • Collaborate with product, design, machine learning, risk, and compliance teams to deliver secure and trusted financial solutions.
  • Establish standards and practices that promote robustness, security, and efficiency across all platform components.

Other

  • Excellent communication skills, with the ability to align technical decisions with business objectives.
  • Balanced mindset that values rapid iteration while maintaining a focus on long-term stability and scalability.
  • Flexible remote work options to support work-life balance.
  • Inclusive workplace culture that values diversity and equity.