Jeremy Huang is founder and CEO of Jcode, an open-source coding-agent company in Y Combinator’s Summer 2026 batch. He focuses on running multiple agents in parallel with less memory overhead.[1]
Start with Jcode →
Links
JcodeFounder and CEO · Jcode
Contributions
Coordinating agents in a repository
Jcode manages sessions through a shared server. When one agent changes a file another has read, the server notifies the second agent so it can inspect the change and respond. Agents can message one another or coordinate a group of workers. The software supplies communication and awareness of changes; agents still need to reason about conflicts and the correctness of their combined work.[2]
Customizing the harness itself
The project’s self-development mode lets an agent modify, build and test Jcode’s own source, then reload its binary while continuing a session. This makes the harness another editable part of the workflow. Its demonstrations and reproducible benchmarks expose concrete behavior such as startup latency and incremental session memory.[2]
Ideas
Huang frames the number of agents a developer can run as a systems problem: each additional process consumes memory, so a heavy harness can constrain concurrency before the model service becomes the limit. Jcode’s design targets that overhead. His company’s launch demonstrates a workflow with many parallel agents; its comparative measurements are project-specific benchmarks rather than a general promise for every machine or task.[1]
Tools, writing & talks
Tools
Start here
Jcode
github.comA coding-agent harness with shared session management, agent messaging and a workflow for modifying its own implementation.
Start with the demonstration and swarm explanation before configuring a model provider. Trying the tool requires a supported development machine and credentials or login for the chosen model service.
Creator and company founder[1][2]Original source
Writing, research & talks
- Jcode launchycombinator.com
Huang’s first-person explanation and demonstration of the memory problem behind parallel coding agents.
Founder and presenter[1]