About The RoleWe're looking for a Senior Backend Engineer to independently own features and deliver high-quality backend systems.You'll take projects from spec to production, write code that others want to work with, and help mentor newer engineers.At this level, you're a reliable, autonomous contributor—you can scope and ship features end-to-end with minimal guidance and proactively unblock yourself and others.What You'll DoOwn features end-to-end — scope, design, build, test, and ship features independentlyWrite quality code — deliver clean, testable, well-documented code with strong testing disciplineUnblock the team — proactively help teammates debug issues and remove blockersHandle on-call — confidently respond to incidents using observability toolsMentor newer engineers — support E1s through pairing, onboarding, and code reviewLeverage AI daily — use AI tools to accelerate coding, debugging, testing, and learningPay down tech debt — identify and fix issues that slow the team downWhat We're Looking ForTechnical3+ years building backend systemsStrong experience with Java (Python/Go a plus)Good understanding of distributed systems, APIs, and cloud infrastructureStrong testing discipline—unit tests, integration tests, edge casesSystematic debugging skills across service boundariesAI FluencyUses AI tools (Copilot, Claude, ChatGPT) daily for coding,



debugging, and test generationBuilds reusable prompts or workflows that help the teamTeaches effective AI usage to junior engineersCurious about new AI capabilities relevant to backend developmentCommunicationWrites clear design docs and runs small design discussionsGives and receives direct, timely feedbackFluent in Spanish; working knowledge of English for cross-team collaborationMindsetSelf-directed; you don't wait to be told what to doComfortable with ambiguity and changing requirementsProduct‐minded—you care about business outcomes, not just codeNice to HaveExperience in fintech, payments, or lendingFamiliarity with our stack: AWS (ECS, Lambda), PostgreSQL, Kafka, DataDogOn‐call and incident response experienceUnderstanding of the Mexican fintech ecosystem (BNPL, credit, regulation)Our StackJava (primary), Python, GoAWS (ECS, Lambda)PostgreSQLKafkaDataDogPulumiJenkinsWhy AplazoOur mission is to empower financial access and opportunity across Latin America through fair, simple, and transparent solutions.Our tech vision: be the most beloved and innovative tech organization in Latin America.We're a Series B fintech growing fast—you'll have real ownership, impact, and the chance to shape how millions of people access credit.
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📌 Sr. Backend Engineer (Xico)
🏢 Aplazo
📍 Xico