Engineering. How we build Praxen Inc.

Oct 22, 2026

How to build a memory system for proactive agents

Proactive agents run without a prompt, so each run has to start from what earlier runs learned. How we built memory for Praxen Inc.'s agents on git: one repository per team, a nightly clean-up, and lessons from merged pull requests.

Recently published

Oct 14, 2026

Nobody reads pull request descriptions, so we made videos

Almost none of the pull requests Praxen Inc. opens were asked for by an engineer, and a longer description does not make them easier to review. We are experimenting with a narrated video for every fix. Why, what it looks like, and what happened to merge rates.

Vi Tran
Oct 5, 2026

Turn your app into a context graph

Agents that run software need a context graph of the app: every resource, what it connects to, the repository that deploys it and the team that owns it. How we built one on Durable Objects, keep it fresh across every provider without polling AWS, decide what counts as a change, and delete from it safely.

Sep 21, 2026

How we prevent slop from hitting prod

Nothing in your pipeline asks whether a change is safe for prod. This is the check we built that does, and how we got it to finish before your tests do.

Vi Tran
Sep 14, 2026

Sub-agents are just wrong

Praxen Inc.'s autofix used to be a workflow of multiple agents, each responsible for a single task, with an orchestrator managing state between them. We moved to a single agent which does the entire job, from evidence gathering, hypothesis testing to pull request.

Aleksandr Diamond
Aug 26, 2026

How We Fixed Our Cloudflare Durable Objects Memory Exceeded Errors

Cloudflare Durable Objects run in V8 isolates with a hard 128 MB limit. Ours idled at ~140 MB and was reset ~300 times a day. 130 MB of zod schemas were built at module load, most of them by code that was never called. How we profiled the production bundle, the two fixes, and the numbers, 218 MB to 82 MB and resets to zero.

Aleksandr Diamond
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