Tesser
Tesser is a developer tool that lets engineering teams run multiple worktrees in parallel by offloading dev servers and heavy workloads to isolated cloud machines, while forwarding all ports back to localhost so apps behave as if running locally. It supports local agents like Claude Code and Codex, as well as cloud agents like Devin, and works with existing stacks like Next.js, Docker, and Python without configuration changes. Teams can also bring their own AWS compute, with Tesser hosting only the control plane.
- Developer Tools
- Software Only
Funding
Founders
Founder details are not available yet.
Product
Problem
Development teams often need to run multiple branches or worktrees simultaneously, but local machines become a bottleneck when dev servers, tests, and builds compete for CPU, memory, and ports. This slows down individual developers and makes it impractical to run parallel coding agents, leading to context switching, merge conflicts, and reduced productivity.
Solution
Tesser enables development teams to run multiple worktrees in parallel by offloading dev servers and other heavy workloads to isolated cloud machines, while keeping all local ports forwarded so applications continue to run at localhost as usual. It supports both local and cloud agents—including Claude Code, Codex, Gemini CLI, and Copilot—and works with common stacks like Next.js, Docker, and Python without requiring configuration changes. Teams can also migrate the compute to their own AWS VPC, with Tesser hosting only the control plane. The tool syncs code over SSH, provides preview links for PR reviews, and lets developers run tests and builds on remote boxes with output streamed back as if executed locally.
Target Audience
Primary users are software development teams, particularly those running multiple coding agents or working on large codebases, who need to parallelize work without local resource constraints.
Features
- Port forwarding to localhost: every port the app uses is forwarded to the laptop, so dev servers open at localhost:3000 with hot reload and sign-in cookies preserved
- Parallel coding agents: each agent gets its own worktree and machine, preventing port conflicts and CPU contention
- Preview links: reviewers can open a running branch at a URL like box-7f3a91.localhost:3000 before reading the diff
- Remote command execution: `tesser exec -- pnpm test` runs the suite on the worktree's machine with output and exit code returned locally
- Bring your own compute: `tesser cloud connect` moves every machine into the team's own AWS account and VPC, with Tesser hosting only the control plane
- Secure code sync: worktree files and git packs move over SSH; the control plane receives only ids, ports, and states, never files, diffs, or terminal output