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