Qu is looking for a Senior Software Engineer to join our Payments team. This role is central to building and maintaining high-performance, secure payment processing systems that power restaurant chains globally. You will work on scalable cloud services, ensuring reliability and security for millions of transactions. At Qu you will: Design and develop scalable, secure, and reliable payment processing services. Collaborate with cross-functional teams to integrate payment gateways and financial services. Optimize system performance and troubleshoot complex issues in production environments. Ensure PCI compliance and implement industry-standard security practices. What we're looking for: 5+ years of software engineering experience with a focus on backend systems. Strong proficiency in Java, Go, or Python. Experience with cloud platforms like AWS or Google Cloud. Solid understanding of microservices architecture and RESTful APIs. Deep understanding of payment flows, including authorization, tokenization, settlement, and reconciliation, within secure, distributed backend architecture. Strong knowledge of Payment Card Industry (PCI) considerations and experience in designing systems for secure handling of sensitive financial data, consistency, and auditability. Desired Qualifications: Previous experience in fintech or payments industry. Knowledge of Kubernetes and containerization. Familiarity with SQL and NoSQL database technologies. Background in restaurant, retail, or POS ecosystems and familiarity with store group hierarchies, check data, or tag-based filtering. Familiarity with Azure DevOps tools, in conjunction with the Atlassian product suite (Jira, Confluence, Rovo, etc.)