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.

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📌 Sr. Backend Engineer (Ciudad de México)
🏢 Aplazo
📍 Ciudad de México