About us:
About the role:
We’re looking for a Senior Full-Stack Engineer to help build and scale a modern web platform using Next.js and Fastify. You’ll take ownership of complex features across the stack, contribute to architectural decisions, and ensure high standards for performance, security, and reliability.

You’ll work closely with product and analytics teams to implement data-driven improvements, integrate analytics, and run A/B tests that enhance the user experience. The role also involves researching and adopting new technologies, including AI-driven solutions, to continuously improve both the product and development workflows.

As a senior team member, you’ll mentor other engineers, promote best practices, and clearly communicate technical concepts to a wide range of stakeholders. This role is adecuado for someone with a strong product mindset who enjoys building scalable, high-quality systems end to end.

Key Responsibilities:
- FullStack Development: Take an active,



hands-on role in developing complex features and modules using Next.js for the frontend and NodeJS for the backend.
- Analytics & Optimization: Collaborate closely with the product team to integrate analytics systems and conduct A/B tests to enhance the user experience.
- Innovation: Research and integrate emerging technologies, particularly AI-driven solutions, to improve the product and streamline development workflows.

Qualifications:
- Next.js: A minimum of 2 years of active, commercial experience with Next.js (v14.x/v15.x). Must have worked on at least two recent projects where Next.js was the primary frontend framework.
- NodeJS: Deep knowledge and at least 3 years of hands-on experience with a modern framework such as NestJS, Fastify, or Hono. A clear understanding of their architectural trade-offs is required.
- Databases:Strong proficiency with PostgreSQL and/or Supabase, including query optimization and schema design.
- ORM:In-depth, practical knowledge of Prisma or Drizzle ORM, with

📌 Senior Full-Stack Engineer (Buenos Aires)
🏢 Ruby Labs
📍 Buenos Aires