Elixir Backend Engineer — Ai-Driven Api Expert

Fullstack Labs, Inc.; La Pampa; A distancia; ARS 136.732.000 - 212.695.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

100% remote work

Company-provided laptop

Generous PTO

Regional holidays

Autonomy & ownership

Descripción de la vacante

Fullstack Labs, Inc. is seeking a Senior Backend Engineer to design, build, and maintain scalable systems in a startup-like environment.

You will own features end-to-end, work with Java and Python, and apply AI-assisted development to boost productivity while upholding quality. You will design distributed architectures, manage databases and messaging queues, and contribute to architectural decisions as the company scales.

Formación

• 8+ years of software engineering or backend development.
• 5+ years of professional Python experience, building production-grade backend systems.
• Strong Java experience.
• Hands-on AI/LLM-based application development experience is a plus.
• Experience with distributed systems, scalable architectures, and asynchronous processing.
• Experience with databases, message queues, and data processing pipelines.
• Hands-on Docker and Kubernetes in production environments.

Responsabilidades

• Design, build, and maintain scalable backend services using Java and Python.
• Develop distributed systems with databases, APIs, queues, and data pipelines.
• Own features from design to monitoring and optimization.
• Build production-ready systems emphasizing reliability and performance.
• Collaborate with product and engineering to translate business needs into technical solutions.
• Improve platform performance, scalability, and operational efficiency.
• Leverage AI-assisted tools to accelerate delivery without compromising quality.
• Participate in architectural discussions and major technical decisions.

Conocimientos

Python

Java

AI/LLM development

Distributed systems

Asynchronous processing

Ownership mindset

English proficiency

Herramientas

Docker

Kubernetes

Kafka

RabbitMQ

Descripción del empleo

The Opportunity

We are looking for a Senior Backend Engineer who thrives in startup environments and enjoys building scalable systems from the ground up.

This role is ideal for engineers who combine deep backend expertise with a strong ownership mindset. You will play a key role in designing, building, and maintaining distributed systems while collaborating with a highly technical and fast-moving team.

The ideal candidate has extensive experience with Java and Python , enjoys solving complex engineering problems, and embraces AI-assisted development workflows to increase productivity without compromising quality.

Responsibilities

• Design, build, and maintain scalable backend services using Java and Python.

• Develop distributed systems involving databases, APIs, message queues, and data processing pipelines.

• Take full ownership of features and services throughout their lifecycle, from design and implementation to monitoring and optimization.

• Build production-ready systems with a strong focus on reliability, performance, and maintainability.

• Collaborate closely with product and engineering teams to translate business requirements into technical solutions.

• Improve system performance, scalability, and operational efficiency across the platform.

• Leverage AI-assisted development tools to accelerate delivery while ensuring code quality and engineering best practices.

• Participate in architectural discussions and contribute to key technical decisions as the company scales.

• Continuously improve development processes, tooling, and engineering standards.

Requirements

• 8+ years of experience in software engineering or backend development.

• 5+ professional experience with Python , building and maintaining production-grade backend systems.

• Strong experience with Java .

• Hands-on experience with AI/LLM-based application development (AI agents, agentic systems, or LLM-powered applications)

• Experience building AI-driven features, LLM integrations, or agentic workflows in production environments is highly preferred.

• Solid understanding of distributed systems, scalable architectures, and asynchronous processing.

• Experience working with databases, message queues, and data processing pipelines .

• Hands-on experience with Docker and Kubernetes in production environments.

• Proven experience building, maintaining, optimizing, and improving products after launch.

• Strong ownership mindset, autonomy, and ability to thrive in startup or fast-paced environments .

• Advanced English level

Nice to have

• Experience working in product-focused companies, owning products beyond the initial development phase.

• Experience in cybersecurity products or security-focused platforms.

• Experience with Kafka, RabbitMQ, or similar messaging systems.

• Experience building large-scale distributed data processing systems.

• Background in high-growth startups or scale-ups.

• Previous experience in large technology companies

What’s in it for You

100% remote work with flexibility to work from LATAM.

Join an early-stage cybersecurity startup where your work will directly impact the product and company growth.

Be part of an engineering culture that embraces modern AI-assisted development workflows.

Company-provided laptop and equipment.

Generous PTO and regional holidays.

High ownership, autonomy, and direct influence on technical decisions.