Senior / Lead Fullstack Engineer

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Aplazo

WebsiteLinkedInAll Job Openings

51 - 200 employees

💳 Fintech

🛍️ eCommerce

🤝 B2B

Fintech • eCommerce • B2B

Aplazo is a Mexico-based Buy Now, Pay Later (BNPL) platform that offers installment payment solutions and marketing tools to physical and online merchants, enabling consumers to purchase products through payments in installments. The company partners with brick-and-mortar and e-commerce merchants to provide point-of-sale financing and merchant-facing marketing tools, with a stated mission to unlock financial access, freedom, and opportunity for every Mexican.

📋 Description

• End-to-end product features — from database schema to API design to the mobile experience users interact with • Internal tools, merchant-facing platforms, and customer-facing mobile flows • Observability from day one — SLOs, alerts, dashboards — so you know when something's broken before users do • Systems designed to be handed off: documented, tested, and legible to the engineer who touches it six months later • Design and implement features across mobile and backend, owning the full surface area • Contribute to (E2) or lead (E3) architecture and design decisions — write proposals, present trade-offs, make calls • Conduct rigorous code reviews — catching correctness issues, security gaps, and opportunities to mentor • Respond to and resolve production incidents, and leave runbooks better than you found them • Use AI tools daily — not as a crutch, but as a force multiplier for speed, testing, and exploration • Help engineers around you grow, especially through pairing, thoughtful feedback, and honest code review (E3)

🎯 Requirements

• 3+ years of fullstack experience (5+ for E3), ideally in B2C products • Strong backend skills: Java/Spring as the primary stack; Python or Go a plus • Strong mobile skills: Flutter/Dart — comfortable building real production apps, not just gluing widgets together • Solid experience with APIs (REST, GraphQL), databases (PostgreSQL, MongoDB), and cloud infrastructure (AWS: ECS, Lambda) • Familiarity with microservices and event-driven architectures • Good testing instincts — unit, integration, and enough end-to-end to actually trust your builds • Comfortable with CI/CD pipelines, observability tools (DataDog), and deployment in cloud environments • Awareness of how payments platforms work — the flows, the constraints, the failure modes that matter in a BNPL or fintech product • Writes clear technical documentation — the kind that actually gets read • Explains trade-offs to engineers and non-engineers alike, without condescension or jargon • Fluent in Spanish; working English for cross-team collaboration with our India and international colleagues

🏖️ Benefits

• A small, senior engineering team that moves fast and argues about the right things • Real ownership: you'll ship features that reach millions of users, not work on internal tooling for years • A culture that takes AI seriously — we run a company-wide hackathon with agentic AI as the theme, and we expect engineers at all levels to be fluent • A team that invests in learning — through engineering workshops, architecture reviews, and direct exposure to hard production problems • An honest engineering culture: we write RFCs, do real code reviews, and have the hard conversations before shipping