Senior Full Stack Engineer

messa t. spa; Argentina; Presencial; ARS 91.438.000 - 137.157.000; Jornada completa

Descripción de la vacante

Messat Spa is seeking a Senior Full Stack Engineer to design, build, and ship core parts of our product. You will work across the stack with a strong emphasis on polished user experiences, while also building reliable backend systems and integrating AI deeply into the product.

We are an early-stage, energetic team where everyone wears multiple hats, moves fast, and cares deeply about what we're building. You’ll own features end-to-end and contribute to shaping what we ship.

Formación

• Expert-level proficiency in React and modern TypeScript.
• Backend API design and server-side basics.
• Polished, intuitive UI/UX design and implementation.
• Experience with AI/LLM tools integrated into product features.
• Product mindset focusing on user experience over tasks alone.
• High-quality code output with minimal review overhead.
• Ability to thrive in an early-stage, fast-moving environment.

Responsabilidades

• Build and own end-to-end product features across the full stack.
• Design and implement clean, high-performance user interfaces.
• Develop and maintain robust APIs and backend services.
• Integrate AI agents and LLM-powered workflows into the product.
• Participate in code reviews and maintain a high quality bar across the codebase.
• Think like a product builder and help shape what we ship.

Conocimientos

React

TypeScript

API design

UI/UX

AI/LLM tools

Product mindset

Clean code

Ambiguity tolerance

Herramientas

Docker

AWS

Python

Descripción del empleo

Role Overview

We're looking for a Senior Full Stack Engineer to help design, build, and ship core parts of our product. You'll work across the entire stack, with a strong emphasis on crafting polished, intuitive user experiences, while also building reliable backend systems and integrating AI deeply into the product.

We’re an early stage full of energy team. Everyone wears multiple hats, moves fast, and cares deeply about what we're building. We need someone with a product mindset: not just an engineer who executes specs, but someone who thinks about why we're building something and how users will experience it.

What You'll Do

• Build and own end-to-end product features across the full stack.
• Design and implement clean, high-performance user interfaces. This is where your craft shines.
• Develop and maintain robust APIs and backend services.
• Integrate AI agents and LLM-powered workflows into the product.
• Participate in code reviews and help maintain a high quality bar across the codebase.
• Think like a product builder: bring ideas, question assumptions, and help shape what we ship.

What We're Looking For

Must-haves:

• Expert-level proficiency in React and modern TypeScript.
• Basic backend experience. You're comfortable designing APIs and working with server-side systems.
• Sharp eye for UI/UX. You build interfaces that feel polished and intuitive, not just functional.
• Experience working with AI/LLM tools in your workflow and integrating AI capabilities into product features.
• Product mindset. You think about the user, not just the ticket.
• High-quality code output with minimal review overhead.
• Comfort with ambiguity and speed in an early-stage environment.

Nice to have:

• Experience building SaaS products from early stages.
• Python coding skills.
• Experience building browser extensions.
• Experience with desktop app development (Electron, Qt, etc.).
• Familiarity with AWS or another major cloud platform.
• Experience using Docker across development and production.
• Experience with AI agent orchestration or agentic workflows.