StartupLondon, England
Northflank
Runtime platform for AI agents, their sandboxes and the software they build
Northflank runs agent workloads in isolated microVM sandboxes and can host coding agents such as Codex, Claude Code, OpenCode and Pi remotely with persistent storage. It also runs services, managed databases, jobs and GPUs, with preview environments per PR and pipelines. It runs on Northflank Cloud or in a customer's own cloud or bare metal, and the site states a registered office in London.
Neighbours in the directory
Prague, Czechia · Est. 2023
Open-source sandboxes for running AI-generated code.
E2B gives agents secure, isolated cloud micro-VMs to execute code and commands — the execution runtime layer of the harness, used by many coding and data-analysis agents.
Est. 2023
Elastic sandboxes for running AI-generated code.
Daytona provides secure, OCI-compatible sandbox 'computers' that spin up in under 90ms — with snapshots for persistent agent state. In 2026 it moved core development to a private codebase while continuing to run as a commercial platform.
New York, NY · Est. 2021
Serverless cloud built for AI and agentic compute.
Modal lets teams run inference, fine-tuning and arbitrary agent workloads as serverless Python without managing infrastructure — a common substrate for harness backends at scale.
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
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Sources
Verified Oct 29, 2026