We are looking for a Senior Python Engineer with strong backend expertise and solid experience in API integrations to join our team. This role will focus on building and maintaining integrations with Shopify Fulfillment Services, designing robust event-driven systems, and ensuring high reliability across distributed components.If you are passionate about scalable architectures, clean code, and solving complex integration challenges, this opportunity is for you.Key ResponsibilitiesBuild internal system adapters and perform complex data mappingImplement webhook processing and event-driven workflowsDesign robust error handling, retry strategies, and idempotent processesWrite comprehensive unit and integration testsCollaborate with the team on API design, architecture decisions, and technical improvementsDebug and troubleshoot production issues with a proactive mindsetRequired Qualifications8+ years of professional experience with Python developmentStrong experience building and consuming REST APIsSolid knowledge of webhook architecture and event handlingExperience with OAuth authentication flowsFamiliarity with e-commerce platforms (Shopify experience is highly preferred)Experience with asynchronous processing and message queuesStrong debugging and problem-solving skillsFluent English communication skillsNice to HaveExperience working with high-volume transactional systemsBackground in distributed systems architectureExperience with cloud environments (AWS, GCP, or Azure)What We OfferOpportunity to work on scalable e-commerce integrationsCollaborative and technically strong team environmentOwnership over architecture and engineering decisionsInternational environment with English communicationAvenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a Consultancy company, Avenue Code may share your information with its clients and other Companies from the CompassUol Group to which Avenue Code's consultants are allocated to perform its services.