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Senior Machine Learning Engineer

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

About this role

Based in Spain, the Senior Machine Learning Engineer role at ACTAI suits an experienced specialist who wants to independently own and scale core machine learning systems for proactive artificial intelligence products. This position is ideal for a hands-on engineer focused on building reliable, long-horizon applications with minimal prompting requirements.

Role Overview

ACTAI seeks a Senior Member of Technical Staff for Machine Learning to design and deliver production-ready artificial intelligence subsystems. The position operates within a hands-on team environment focused on resolving complex technical challenges and maintaining operational reliability at scale.

Key Responsibilities

Construct foundational machine learning systems designed for proactive, long-horizon artificial intelligence products.
Manage the complete lifecycle of projects, covering data preparation, model training, evaluation, inference, and continuous iteration.
Convert research concepts into functional systems operating reliably in live production environments.
Diagnose and resolve model failures and systemic issues using production telemetry and signals.
Operate within production boundaries concerning system latency, financial cost, reliability, and safety.
Partner alongside research, product, and engineering teams to deliver features that achieve business and user goals.
Provide technical mentorship and review contributions from peer machine learning engineers.

Requirements

Experience building and deploying machine learning systems utilized by actual users.
Understanding of how modern machine learning models perform and fail in production settings.
Ability to write robust, production-ready code and design comprehensive systems rather than basic scripts.
Demonstrated capability to take full ownership of tasks, work independently, and execute projects.
Aptitude for rapid learning, clear communication, and continuous improvement through iteration.

Skills and Tools

Python
PyTorch
JAX
GPU-based training systems
GPU-based inference systems

About the Company

ACTAI develops proactive artificial intelligence applications intended to bring intelligence to conversations, daily errands, organization, and workflows with minimal prompting. The organization focuses on high reliability for long-running workflows, persistent context, and real-world task completion to help users save time.

How to Apply

Interested candidates should submit applications on the official company careers page to be evaluated by the technical team.

Skills and tech stack

Questions candidates ask

Where is the Senior Machine Learning Engineer position located?

The position is located in Spain.

What technologies are used in the machine learning tech stack?

The tech stack includes Python, PyTorch, JAX, and GPU-based training and inference systems.

What are the primary focus areas for this role?

The role focuses on building core machine learning systems, managing projects end-to-end, converting research into production systems, debugging model failures, mentoring peers, and adhering to production constraints like latency and cost.

What does the interview process look like?

The interview process consists of three to four interviews conducted through virtual meetings and/or onsite sessions.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site