On
Lead Backend Engineer – POS Platforms Integration
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Backend Engineer – POS Integration & Cloud-Native Architecture
Backend & Integration Engineering
At On, retail isn’t just a channel—it’s an experience. As we scale our global footprint, we’re building the future-ready Point of Sale (POS) ecosystem. We’re looking for a Backend Engineer to orchestrate seamless integrations between physical stores and digital platforms, designing resilient systems that connect ERP, OMS, CRM, and loyalty engines—ensuring fast, reliable, and scalable retail operations.
You’ll join our Retail Experience team, where every integration matters. If you thrive on crafting clean APIs, optimizing performance, and solving real-world system challenges, apply today.
Your Mission
Backend & Integration Engineering
- Design, build, and scale backend services that power POS integrations across ERP, eCommerce, CRM, inventory, and loyalty platforms
- Develop REST and GraphQL APIs that are high-performance, secure, and easy to consume
- Implement real-time and batch data synchronization, authentication flows (OAuth, SSO), and secure event pipelines
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Architecture & Resilience
- Contribute to a cloud-native, event-driven architecture for global retail operations
- Build scalable integration patterns using message brokers (Kafka, RabbitMQ) and serverless workflows
- Ensure ** observability** through proactive monitoring, alerting, and performance tuning (e.g., NewRelic)
Testing & Quality Automation
- Drive reliability with a robust automated testing stack (contract tests, load tests, test data pipelines)
- Collaborate with QA & DevOps to streamline CI/CD and improve release confidence
- Participate in incident response & post-mortem analysis to harden platform stability
Collaboration & Strategy
- Partner with frontend, product, and vendor teams to align integration design with platform needs
- Influence technical decisions during vendor evaluations & rollouts
- Shape On’s composable commerce architecture by advising on system implications and roadmap priorities
Your Story
Experience & Skills
- 3+ years as a Backend Engineer, specializing in Node.js, TypeScript, or equivalent
- Proven expertise integrating APIs for commerce, ERP, OMS, or CRM systems
- Experience with headless commerce, microservices, and composable architecture principles
- Hands-on with Kafka, RabbitMQ, and asynchronous data processing
- Strong knowledge of PostgreSQL and infrastructure-as-code (Terraform)
- Hands-on experience with AWS/GCP/Azure, including scaling and monitoring cloud services
- Expertise in OAuth2, token-based authentication, and secure service design
- Strong debugging and telemetry skills (logs, traces, metrics, real-time alerting)
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What We Offer
At On, growth is centered around you. We provide: ✅ A supportive, collaborative culture where innovation and learning are encouraged ✅ Holistic development—balancing mental and physical well-being with an environment built for growth ✅ Flexibility and purpose-driven work where every role impacts real-world retail solutions
On is an Equal Opportunity Employer. We are committed to diversity, equity, and inclusion, ensuring fair, inclusive recruitment and career progression for all.
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Jessica, London
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