Senior Software Engineer, Qdrant

• While expertise in vector databases is not required for this role, we highly value experience in billing and payments, where handling complex transactions at scale is a critical challenge
• Strong product mindset, with a deep understanding of how payments impact user experience and business success
• Strong problem-solving and expression skills, to work in a remote environment
• Proficiency in Python (FastAPI, Django, Flask, or similar)
• Strong understanding of relational databases, in particular PostgreSQL
• Excellent sense for sustainable code
• Understanding of transaction lifecycles, refunds, chargebacks, and fraud detection
• Experience with at least two of: event sourcing, billing systems, payment processing systems, payment gateways, and marketplace integrations
• Participation in collaborative, test-driven development
• Capability to visualise data
• Familiarity with Kubernetes, Docker, and cloud platforms (AWS, GCP, or Azure)
• Understanding of distributed systems and high-volume transaction processing
• Ability to extend a reactive frontend stack is not frequently required, but should be possible
• Experience with Go is a plus

Desirable

• We are seeking a talented and product-minded Senior Backend Engineer with strong expertise in building resilient systems as well as having a good understanding in how to make them accessible
• As a Senior Software Engineer (Payments), you will design, build, and maintain robust backend systems
• The main focus of your work will be related to billing and payments, which is: precise usage metering, PSP integrations, sales and backoffice extension, reporting among others. You will work in a small multidisciplinary team and collaborate transversally with other cross-functional teams
• This role emphasizes Python as the primary backend language, though familiarity with Go is a plus. Experience with a reactive frontend framework (React, Vue, or similar) is very beneficial
• Design, develop, and maintain billing and payment systems with high precision and attention to detail
• Extend integrations with payment gateways (e.g., Stripe, Adyen, PayPal, Braintree) and marketplaces (e.g., Amazon, eBay, Shopify, App Stores)
• Design and implement user-friendly interfaces and interaction flows for billing and payment systems, ensuring accessibility for non-technical users such as accounting staff, customer support, end users or growth teams
• Extend monitoring and alerting
• Implement fraud detection mechanisms, chargeback handling
• Collaborate closely with product managers, frontend engineers, and other backend engineers to create user-friendly and frictionless payment experiences
• Ensure regulatory compliance (e.g., PCI-DSS, GDPR) in payment implementations