**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 mínimal 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 (México)
🏢 Aplazo
📍 México