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Principal Machine Learning Engineer

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

About this role

Based in the United Kingdom, this Principal Machine Learning Engineer role at bjakcareer centers on leading the execution layer for AI-driven applications and suits an experienced practitioner specializing in production-ready machine learning systems. The position requires managing the entire machine learning lifecycle to transform research concepts into reliable infrastructure.

Role Overview

This hands-on leadership position requires an individual to oversee intelligence systems, manage long-running workflows, and build proactive applications requiring minimal user prompting. The professional bridges the gap between research, systems, and product development to ensure high reliability and persistent context.

Key Responsibilities

Manage the end-to-end machine learning systems encompassing data, training, evaluation, inference, and deployment.
Construct and develop training and fine-tuning pipelines for large models.
Formulate evaluation systems that track capability, robustness, safety, and product performance.
Develop high-performance inference systems focusing on latency, GPU efficiency, memory management, cost, and reliability.
Establish data pipelines for real-world and synthetic training data.
Create stable production infrastructure for continuous model monitoring and enhancement.
Collaborate with research and application engineering teams to integrate model capabilities into products.

Requirements

Proven history of building and launching machine learning systems in production environments.
Deep comprehension of modern large-model training, fine-tuning, evaluation, and inference techniques.
Solid foundation in software engineering and systems architecture.
Background in running machine learning workloads at scale, specifically with GPU-based systems.
Independent problem-solving abilities and strong technical judgment.

Skills and Tools

Python
PyTorch / JAX
GPU-based training and inference systems

About the Company

Bjakcareer builds proactive applications designed for global users who do not rely on complex prompting, aiming to bring intelligence to everyday tasks, conversations, organization, and workflows. The organization operates as a small, high-talent-density team where engineers maintain broad ownership, make rapid decisions, and prioritize engineering fundamentals alongside execution speed.

How to Apply

Interested candidates should apply on the official company careers page.

Skills and tech stack

PythonPyTorchJAXMachine LearningFine-tuning

Questions candidates ask

Where is the job located?

The role is located in the United Kingdom.

What level of experience is required for this role?

This is a principal position requiring a candidate with a history of building and shipping production machine learning systems, large-model familiarity, and software engineering fundamentals.

What does the tech stack include?

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

What does the interview process involve?

The interview process consists of three to four interviews conducted via virtual meetings and/or onsite, evaluated by technical team members.

What is the primary mission of the company?

The company builds proactive, AI-native applications for everyday tasks, conversations, and workflows with minimal to no prompting.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site