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ML Research Scientist - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Callosum is seeking an ML Research Scientist to develop foundational intelligent systems by researching model architectures, learning algorithms, and efficient training methods. The role involves end-to-end research ownership, from hypothesis generation to large-scale implementation, working across a full-stack infrastructure.

Agentic AI AI Machine Learning Python PyTorch

101K – 192K £

Research Engineer, Evals - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Research Engineer building benchmarks and evaluation suites for agentic AI systems—designing rigorous measures for multi-turn, tool-using LLMs, turning traces into structured evidence, and building evaluation/observability infrastructure the whole company relies on.

Agentic AI AI LLM Machine Learning Observability

101K – 192K £

Agent Runtime & Systems - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Builds the runtime and programming model for long-running AI agents that run for weeks across distributed infrastructure, focusing on durability, observability, and secure tool execution.

AI API Api Design C++ Distributed Systems +10 skills

101K – 192K £

ML Research Engineer - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

ML Research Engineer at Callosum designing experiments to understand why agentic AI systems fail, building evaluation infrastructure, and publishing findings to improve heterogeneous model/hardware orchestration.

Agentic AI AI Distributed Systems LLM Observability +1 skills

101K – 192K £

Evolutionary Optimisation - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Build and improve an LLM-guided evolutionary search system that iteratively generates, evaluates, and optimises programs across kernels, inference runtimes, and scheduling policies, working with optimisation and search algorithms at an AI infrastructure startup in London.

AI LLM Machine Learning

101K – 192K £

Research Engineer, Benchmarking - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Build and own a unified benchmarking system for evaluating agentic and algorithmic LLM solutions at Callosum's London office, using Python, sandboxed execution, and distributed systems to produce reproducible, contamination-controlled evaluation results.

Agentic AI AI LLM Machine Learning Python

101K – 192K £

Networking & Interconnect Systems - Member of Technical Staff

Open 18d On-siteUK Licensed UK sponsor

Build the networking and interconnect systems that let heterogeneous AI accelerators communicate efficiently, spanning RDMA, programmable NICs, memory movement, and cluster fabric strategy at Callosum's London office.

AI Ethernet Networking

101K – 192K £

Agent Engineer

Open 27d On-siteAPAC

Build and maintain production-grade AI agents for India’s largest banks, insurers, and government departments, treating agents as engineered artifacts with versioning, evals, and regression suites.

Agentic AI AI API Cloud Conversational AI +5 skills

Recruitment Hive

ICT Project Manager

Open 17d HybridContract

Oversees ICT projects end-to-end, managing plans, risks, and stakeholder alignment for government environmental protection tech; uses methodologies like Prince2, Agile, and SAFe.

Agile Express.js Hive Networking SAFe Agile

120 – 140 AUD / hr

Machine Learning Programmer, Memory

Open 25d North America H-1B sponsor history

Design memory architectures for AI models to store, retrieve, and exploit experience across modalities, improving long-horizon decision-making in production systems.

Agile Game Development Machine Learning NumPy Observability +5 skills

Lead Network Engineer - Wireless networks

Open 18d On-siteAPACLead

Lead Network Engineer owning the performance, reliability, and scalability of Halter's LoRa-based wireless IoT collar-to-tower network, ensuring real-time telemetry delivery across rural farm environments.

Automation Backbone.js Cloud Data Pipelines Firmware +2 skills

Senior Network Engineer - Wireless networks

Open 18d On-siteAPACSenior

The Senior Network Engineer will own the performance, reliability, and scalability of Halter's wireless IoT network, which connects cattle collars to the cloud. This hands-on role involves designing network architecture, managing tower infrastructure, and ensuring robust data flow across rural environments.

Automation Backbone.js Cloud Data Pipelines Firmware +2 skills

Precision Signs Australia

Senior / Lead Software Engineer — Backend & Platform

Open 17d RemoteLead

Lead or senior backend engineer owning a distributed platform for digital signage, handling content delivery, real-time events, and offline operations across unreliable networks. Core stack: C#/.NET, PostgreSQL, AWS.

API AWS CI/CD Cloud C# +14 skills

120K – 150K AUD

Senior Solutions Engineer

Open 82d RemoteAPACSenior

A senior Solutions Engineer partners with enterprise sales and channel partners to diagnose customer challenges, propose Atlassian’s cloud/AI-driven collaboration tools as solutions, and drive deal closure through technical demos and strategic guidance.

Atlassian Cloud HubSpot Pre-sales

Quanta Services Management Partnership

Service Portfolio, Product Owner

Open 37d North AmericaFull-time

Own and modernize the IT service catalog and front-door experience for 60+ autonomous operating companies using ServiceNow, driving automation and governance to simplify IT requests.

Automation ITIL ServiceNow Vendor Management

Lynker Corporation

IT Specialist – Service Desk Support and Systems Administrator

Open 17d North AmericaInternshipJunior

Supports space weather forecasting IT systems by resolving complex hardware/software/network issues, administering Windows environments, and ensuring 24/7 operational continuity for government users.

Active Directory Authentication Automation Cybersecurity Help Desk +3 skills

Director, Hardware Engineering

Open 17d RemoteNorth America H-1B sponsor history

Leads hardware engineering teams to develop and refine consumer products, balancing technical execution with strategic roadmap planning and risk mitigation for Cricut’s creative tools.

AI Minitab Prototyping Spark

NTT America, Inc.

DB2 Database Administrator (DBA)

Open 17d RemoteUK H-1B sponsor history

Manages IBM z/OS DB2 databases, ensuring high availability, security, and performance for enterprise clients. Focuses on administration, automation, disaster recovery, and collaboration with global teams to optimize database operations and support business continuity.

Business Analyst

You’ll analyze business data, build Excel reports and dashboards, and automate workflows while bridging gaps between business teams and developers in a product company.

Automation CRM Data Quality SFTP VBA

UI Product Designer

Open 18d RemoteEurope, MENAC-level

Designs fast, modern AI-native UI for wholesale-distribution software, owning the visual language and design system while prototyping in code with AI tools.

Agentic AI Agile AI Claude Code CRM +7 skills