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Member of Technical Staff, Machine Learning

bjakcareerUnited KingdomActAI 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

ACTAI is hiring a Member of Technical Staff, Machine Learning in the United Kingdom to build core ML components for proactive, AI-native applications. This position suits engineers who want to learn how large-scale machine learning behaves in production systems and develop strong systems judgment.

Role Overview

ACTAI is seeking a Member of Technical Staff, Machine Learning based in the United Kingdom for a full-time position. The successful candidate will work directly on production systems from the first day, focusing on applications designed to handle long-running workflows and persistent context with minimal prompting. The role involves developing machine learning components while navigating real-world production constraints such as safety, cost, latency, and reliability.

Key Responsibilities

Build and enhance machine learning components spanning data, training, evaluation, and inference
Fine-tune and adapt models to function inside larger production architectures
Establish evaluation and testing frameworks to track model behavior
Construct and maintain data pipelines utilizing both synthetic and real-world data
Troubleshoot model issues, production incidents, and performance bottlenecks
Release iterative improvements and incorporate real user feedback
Collaborate alongside senior machine learning engineers and product teams
Operate within production constraints including latency, cost, safety, and reliability

Requirements

Solid foundations in machine learning principles and modern neural architectures
Practical, hands-on background in deploying, training, or fine-tuning machine learning models
Ability to write production-grade code and rapidly learn new tools
Curiosity, coachability, and willingness to learn from active production systems
Capacity to navigate ambiguity with guidance and expand ownership over time
Strong inclination toward shipping, iteration, and continuous improvement

Skills and Tools

Python
PyTorch
JAX
Production ML systems running on GPUs

About the Company

ACTAI aims to transform everyday basic applications like email, notes, calendar, and tasks into proactive, AI-native tools that require little to no prompting. The company focuses on persistent context, high reliability for long-running workflows, and real-world task completion to reduce hallucinations and help users organize their lives. ACTAI operates as a hands-on, high-talent team that values collective decision-making, rapid execution, transparency, and efficiency.

How to Apply

Interested candidates should visit the official company careers page to submit an application.

Skills and tech stack

PythonPyTorchJAXGPUsMachine LearningFine-tuning

Questions candidates ask

Where is the position located?

The role is located in the United Kingdom.

What technical stack is used in the role?

The tech stack includes Python, PyTorch or JAX, and production machine learning systems running on GPUs.

What is the interview process like?

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

What is the primary mission of the company?

The company's mission is to build proactive applications for anyone globally that bring intelligence to conversations, workflows, errands, and organizing with minimal to no prompting.

Ready to apply?

The application is on the official bjakcareer careers page.

Apply on company site