Replicas builds end-to-end background coding agents that let engineering teams delegate tickets to Claude Code or Codex without leaving the tools they already use. From Slack, Linear, GitHub, or a chat window, an engineer can hand off a task and Replicas spins up a sandboxed virtual machine where the agent reads the codebase, writes the change, opens a pull request, and iterates until the work is genuinely shippable.
What separates Replicas from a thin wrapper around a foundation model is its feedback loop. Each agent monitors continuous integration, reads every code review comment, and pushes fixes automatically, so reviewers stop playing ping pong over trivial failures. Through its Environments product, teams configure agents to boot their full stack locally, run end to end checks, and serve preview URLs so reviewers can click through a working build before merging. This dramatically raises the quality bar on agent generated PRs.
Founded in 2026 by Saai Arora and Connor Loi, the company is based in San Francisco and went through Y Combinator P26. Replicas is already used inside more than twenty YC startups, where small teams use it to parallelize across dozens of tickets at once. The pitch is simple: instead of one engineer plus one chat based copilot, every engineer gets a fleet of background replicas that burn down the backlog while the humans focus on architecture and review.