Staff Software Engineer - POS Integrations

On is rapidly expanding its global retail footprint across multiple store formats and geographies, laying the foundation for a scalable, future-ready retail technology ecosystem. The role will architect and scale core retail technology infrastructure spanning Point of Sale (POS), ERP/financial system integrations, replenishment software, and omnichannel commercial capabilities such as clienteling and digital queuing. It bridges retail strategy and technology by designing resilient event-driven architectures, shaping complex integrations across online and offline channels, and eliminating domain bottlenecks to enable sustainable business growth.

• Lead the architecture, design, and scaling of backend systems and integration pipelines connecting POS, ERP (financial systems), OMS, CRM, and replenishment platforms across global physical store formats.
• Build cloud-native, event-driven architectures utilising message brokers (Kafka, RabbitMQ) and resilient REST/GraphQL APIs for real-time and batch data synchronisation.
• Architect secure, high-availability omnichannel services, ensuring robust authentication (OAuth2, SSO) and data integrity across online and offline retail operations.
• Drive operational excellence across POS and standard retail infrastructure, establishing observability best practices (metrics, distributed tracing, alerting via tools like New Relic) and leading root-cause investigation and resolution of complex
• Cross-system issues to harden platform stability and performance.
• Establish rigorous engineering and quality standards, guiding test automation strategies (contract testing, load testing, CI/CD pipelines) to ensure reliable release velocity.
• Act as a key domain expert for retail operations technology, distributing technical knowledge across engineering teams to build a resilient, multi-pillar domain structure.
• Drive commercial innovation by architecting and rolling out next-generation retail capabilities, including clienteling, digital queuing, and connected in-store digital experiences.
• Balance global system standardisation with local market and physical store format variations across international geographies.
• Partner with architecture leadership (Staff Principals), Product Managers, and Retail Operations to align technical solutions with long-term business strategy, guide technical decision-making, evaluate vendor platforms, and influence the broader composable commerce strategy at On.
• Mentor and guide software engineers, fostering a culture of technical rigor, continuous learning, and collaborative problem-solving.

• Proven experience designing, building, and operating Point of Sale (POS) systems in a production retail environment.
• Hands-on experience with financial system integrations (ERP) and retail backend software (e.g., replenishment, inventory management, OMS).
• Strong retail operations knowledge with an understanding of physical store layouts, multi-format rollouts, and physicalisation challenges.
• Extensive experience in backend engineering using modern technologies (Node.js, TypeScript, or equivalent execution environments).
• Demonstrated expertise in event-driven architecture, asynchronous message brokers (e.g., Kafka), and cloud-native microservices (AWS, GCP, or Azure).
• Solid grasp of relational databases (e.g., PostgreSQL), API design (REST, GraphQL), and Infrastructure-as-Code (Terraform).
• Track record of leading solution design for complex, large-scale systems and driving end-to-end delivery of major platforms.
• Experience operating in global or multi-geography retail environments, balancing standardisation with local market requirements.
• Ability to balance rapid commercial innovation with high system reliability, security, and operational stability.