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Full Stack Engineer, AI systems

bjakcareerPortugalActAI Engineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Experience
Mid
Posted
28 Sept 2026
Status
Open · checked 7d ago

About this role

This role suits engineers who have strong backgrounds in full-stack development and want to build production-grade AI systems in Portugal. The Full Stack Engineer, AI systems position at bjakcareer involves constructing the product layer for proactive applications designed to handle long-running workflows and real-world task completion.

Role Overview

The Full Stack Engineer, AI systems position is a full-time job located in Portugal. The team builds proactive applications that bring intelligence to everyday tasks with minimal prompting, focusing on high reliability and persistent context.

Key Responsibilities

Construct end-to-end product features covering the frontend, backend, and AI integrations.
Plan and design agent workflows that manage tool use, planning, failure, and recovery across multiple steps.
Incorporate large language models, external tools, and memory into systems operating under real-world conditions.
Create real-time AI interactions featuring streaming, tight latency constraints, and partial results.
Enhance system observability, fallback mechanisms, and overall reliability.
Partner with machine learning, product, and backend teams to deliver features from conception to production.
Iterate continuously based on actual usage patterns and failure modes.

Requirements

Extensive background in full-stack engineering encompassing both frontend and backend development.
Sound comprehension of API architecture and system design principles.
Practical background working with AI-powered applications, retrieval-augmented generation systems, or large language models.
Capability to navigate ambiguity and execute pragmatic engineering choices.
High ownership capacity to drive features from initial ideas to production deployment.
Adaptability for fast-paced environments with changing requirements.

Skills and Tools

Next.js
Python
Node.js
PyTorch
OpenAI, Anthropic, and open-source large language models
SQL and NoSQL databases
Kubernetes
Docker

About the Company

ACTAI aims to replace basic, non-AI-native applications with proactive software that assists users with communication, errands, organization, and workflows without requiring complex prompting. The organization operates as a small, hands-on, high-talent-density team making collective decisions and moving quickly to ship reliable software.

How to Apply

Interested candidates should apply on the official company careers page.

Skills and tech stack

Next.jsPythonNode.jsPyTorchOpenAIAnthropicSQLNoSQLKubernetesDockerLLMLLMsRAG

Questions candidates ask

Where is this job located?

The role is located in Portugal.

What technologies are used in this role?

The tech stack includes Next.js, Python, Node.js, PyTorch, OpenAI, Anthropic, open-source LLMs, SQL, NoSQL, Kubernetes, and Docker.

What is the interview process like?

The interview process consists of three to four interviews conducted virtually or onsite, evaluated by technical team members.

What are the core objectives of the product?

The objective is to build proactive applications with high reliability for long-running workflows, persistent context, and real-world task completion with minimal prompting.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site