Senior / Lead Fullstack Engineer
About The RoleWe're looking for a Senior or Lead Full Stack Engineer to build web applications across the entire stack. You'll work on both frontend and backend systems, shipping features end-to-end and helping define how our products come together.At E2, you independently own features and deliver high-quality code across the stack. At E3, you're the technical leader of your squad—owning entire systems, driving architecture decisions, and mentoring engineers.What You'll DoBuild end-to-end — Design and implement features across frontend and backendOwn systems — Take responsibility for web applications from idea to production (E3)Write quality code — Deliver clean, testable, well-documented code on both sides of the stackDrive technical decisions — Contribute to (E2) or lead (E3) architecture and design discussionsMentor engineers — Help teammates grow through pairing and code reviewLeverage AI daily — Use AI tools to accelerate development, testing, and problem-solvingImprove observability — Build monitoring and alerting into systems from the startHandle incidents — Respond to and resolve production issues across the stackWhat We're Looking ForTechnical3+ years fullstack experience (5+ for E3)Strong backend skills: Java/Spring (Python or Go a plus)Strong frontend skills: Angular or React, TypeScript, HTML/CSSExperience with APIs (REST, GraphQL), databases (PostgreSQL, MongoDB), and cloud infrastructure (AWS)Solid testing practices across the stackComfortable with CI/CD pipelines and observability toolsAI FluencyUses AI tools (Copilot, Claude, ChatGPT) daily for coding, debugging, and testingBuilds reusable prompts or workflows that help the team (E2)Uses AI strategically for architecture exploration, large refactors, and prototyping (E3)Eager to stay current on AI capabilities relevant to development and fintechCommunicationWrites clear technical documentationExplains trade-offs effectively to engineers and stakeholdersFluent in Spanish; working knowledge of English for cross-team collaborationMindsetProduct-minded—you think about user experience and business outcomesComfortable moving between frontend and backend as neededStrong ownership; you see problems through to resolutionNice to HaveMobile development experience (Flutter, React Native)Experience in fintech, payments, or e-commerceOn-call and incident response experienceContributions to shared libraries, tooling, or internal platformsOur StackBackend: Java/Spring, Python, Go PostgreSQL, MongoDB AWS (ECS, Lambda) GraphQL Frontend: Angular, React TypeScript HTML/CSS Tools: DataDog Pulumi JenkinsWhy 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 across the stack, and ship features that reach millions of customers.Personal data collected during the recruitment process will be processed in accordance with the Privacy Notice of Aplaz, S.A. de C.V. (“Aplazo”), available at our Privacy and Policy Notice.Aplazo does not discriminate on the basis of race, religion, skin color, sex, gender, age, ethnic or national origin, marital status, disability, social or economic status, sexual preferences, or any other condition or characteristic. Selection is based solely on the qualifications and merits of the candidates.