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Freelancer Overview
Amanda Chen Senior Software Engineer chenamanda721@outlook.com +1(469)491-1269 NewYork,NY https://www.linkedin.com/in/aechen/ PROFILE SeniorBackendEngineerwith6+yearsbuildingproductionsystems,workflowautomation,andcloud-nativeservices at scale. Deep expertise in Python (FastAPI, Django, Flask) and Java/Spring Boot for API and microservice development,withextensiveAWSdeploymentexperience.Specializesindesigningreliable,observable,andsecure- by-defaultbackendarchitectures.Provenabilitytodeliveriterativeimprovementsacrossdistributedsystemsinfast- pacedenvironments. WORKEXPERIENCE Flex NewYork,NY SeniorSoftwareEngineer|Remote|09/2024-Present Project:RentFlexibility&PaymentSchedulingPlatform Designedafault-tolerantpaymentorchestrationengineinPythonandFlaskwithdistributedlockingviaRedis topreventduplicatechargesduringhigh-concurrencymonth-endprocessing. Re-architectedrecurringbillingreconciliationusingCelerywithcheckpoint-basedtaskrestartability,enabling mid-executionrecoveryandeliminatingdatainconsistenciesfrompartialjobfailures. Hardened multi-tenant API security with Flask middleware, OAuth2, and JWT role-scoped validation to enforcestrictresourceisolationbetweenrentersandpropertymanagers. Introduced event-driven architecture with Apache Kafka to decouple payment status processing, sustaining 500K+paymenteventsperdayandpreventingcascadingfailuresunderpeakload. DiagnosedandresolvedPostgreSQLqueryperformancedegradationbyrestructuringdatamodels,eliminating N+1patterns,andi
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