Sr. Backend Engineer

Aplazo; Ciudad de México; Presencial; MXN 803.858 - 1.161.128; Jornada completa

Descripción de la vacante

A leading fintech company is looking for a Senior Backend Engineer to independently own features and build high-quality backend systems. You will mentor junior engineers and actively contribute to team success. Ideal candidates should have 3+ years of experience in backend development, strong Java skills, and be fluent in Spanish. This role entails significant autonomy in project ownership and usage of AI tools for coding and debugging. Join a dynamic environment that empowers financial access across Latin America.

Formación

• 3+ years building backend systems with Java or similar.
• Experience with cloud infrastructure and APIs.
• Fluency in Spanish; working English for collaboration.

Responsabilidades

• Own features end-to-end from design to deployment.
• Write clean, testable, documented code.
• Mentor junior engineers and assist in debugging.

Conocimientos

Backend systems development

Java programming

Testing discipline

API knowledge

AI tools utilization

Communication in Spanish

Herramientas

AWS

PostgreSQL

Kafka

DataDog

Jenkins

Descripción del empleo

About The Role

We’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 Do

• Own features end-to-end — scope, design, build, test, and ship features independently
• Write quality code — deliver clean, testable, well-documented code with strong testing discipline
• Unblock the team — proactively help teammates debug issues and remove blockers
• Handle on-call — confidently respond to incidents using observability tools
• Mentor newer engineers — support E1s through pairing, onboarding, and code review
• Leverage AI daily — use AI tools to accelerate coding, debugging, testing, and learning
• Pay down tech debt — identify and fix issues that slow the team down

What We’re Looking For

Technical

• 3+ years building backend systems
• Strong experience with Java (Python/Go a plus)
• Good understanding of distributed systems, APIs, and cloud infrastructure
• Strong testing discipline—unit tests, integration tests, edge cases
• Systematic debugging skills across service boundaries

AI Fluency

• Uses AI tools (Copilot, Claude, ChatGPT) daily for coding, debugging, and test generation
• Builds reusable prompts or workflows that help the team
• Teaches effective AI usage to junior engineers
• Curious about new AI capabilities relevant to backend development

Communication

• Writes clear design docs and runs small design discussions
• Gives and receives direct, timely feedback
• Fluent in Spanish; working knowledge of English for cross-team collaboration

Mindset

• Self-directed; you don’t wait to be told what to do
• Comfortable with ambiguity and changing requirements
• Product‑minded—you care about business outcomes, not just code

Nice to Have

• Experience in fintech, payments, or lending
• Familiarity with our stack: AWS (ECS, Lambda), PostgreSQL, Kafka, DataDog
• On‑call and incident response experience
• Understanding of the Mexican fintech ecosystem (BNPL, credit, regulation)

Our Stack

• Java (primary), Python, Go
• AWS (ECS, Lambda)
• PostgreSQL
• Kafka
• DataDog
• Pulumi
• Jenkins

Why Aplazo

Our 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.