Senior Software Engineer - Payments (Singapore, APAC)

Almost every dollar that moves through Shopify payments, payouts, refunds, fees, cross-border sales eventually has to be recorded accurately, reconciled, and trusted. As a Senior Software Engineer on this team, you'll build the financial systems that make money movement correct and reliable at scale, and the cross-border commerce technology that lets merchants sell into new countries without managing duties, taxes, and currency conversion themselves.

You’ll help design and build Shopify Ledger infrastructure that underpins financial correctness across all Shopify products. Ledger records and reconciles money movement such as charges, payouts, refunds, and fee splits. This system provides an auditable source of truth for balances and transaction history, giving Shopify the core primitives needed to operate money products reliably at scale.

You’ll join a small, senior team at the intersection of payments, cross-border commerce, finance, and data. Engineers on this team play a meaningful role in shaping what gets built, not just how it gets built, identifying high-impact problems for merchants and partnering across Shopify to solve them. You'll join a bench of Staff and Senior-level engineers and step into peer-level technical conversations from day one.

Because the team is based in APAC and collaborates closely with partners and teams in North America, comfort with async communication is essential.

Key Responsibilities

• Design, build, and operate highly reliable, scalable distributed systems that handle money movement at Shopify

• Build and maintain financial infrastructure that keeps money movement accurate, reconciled, and trustworthy

• Work in Ruby on Rails within Shopify's core platform, and in Go for new services

• Partner closely with payments, commerce, finance, and data teams across Shopify

• Collaborate effectively with external partners and providers across global time zones

• Own ambiguous, high-impact problems end to end, from shaping the approach to delivering production-ready systems

• Bring a merchant-first mindset to the work and help define not just how systems are built, but what should be built

• Participate in an incident response on-call rotation

• Use AI tools to accelerate engineering workflows, proof of concept, and raise the quality of day-to-day development

Qualifications

• Strong backend engineering experience, with depth in distributed systems, service design, and production operations

• A track record of designing, building, and operating highly reliable, scalable systems, that require strong guarantees around consistency, fault tolerance, idempotency, recovery, or data integrity.

• Comfort navigating ambiguity, shaping loosely defined problems, and driving work forward with a high degree of ownership.

• Excellent written communication skills and comfort collaborating asynchronously across time zones.

• Strong system design and problem-solving skills, with the judgment to make thoughtful trade-offs between correctness, complexity, performance, and delivery speed

• Proficiency in a backend language such as Ruby and/or Go (Shopify hires for strong engineering fundamentals, not a specific stack)

• A collaborative approach to working across multiple internal teams and external partners

• Willingness to occasionally join meetings or calls outside standard hours to overlap with global teams

Nice to have

• Experience with payments, fintech, or other financial systems

• Familiarity with money-movement systems, ledgers, or accounting primitives

• Exposure to cross-border or international commerce duties, taxes, FX, or compliance

• Hands-on experience with Ruby on Rails and/or Go

• Experience operating production systems and participating in on-call

We may use AI-enabled tools to screen, select, and assess applications. All AI outputs are reviewed and validated by our recruitment team.