---
title: "Engineering Notes"
description: ""
position: 3
---
Technical notes that document infrastructure decisions, performance investigations, and design rationale behind NeMo Gym.

<Cards>

<Card title="Responses API Evolution" href="/v0.2/infrastructure/engineering-notes/responses-api-evolution">
Why NeMo Gym uses the Responses API and how it differs from Chat Completions.

<Badge minimal outlined>api-design</Badge> <Badge minimal outlined>schema</Badge>
</Card>

<Card title="SWE RL Infrastructure Case Study" href="/v0.2/infrastructure/engineering-notes/swe-rl-case-study">
Infrastructure challenges and deployment topology for SWE RL training.

<Badge minimal outlined>swe-rl</Badge> <Badge minimal outlined>case-study</Badge>
</Card>

<Card title="aiohttp vs httpx" href="/v0.2/infrastructure/engineering-notes/aiohttp-vs-httpx">
Why NeMo Gym uses aiohttp instead of httpx for async HTTP.

<Badge minimal outlined>server-infra</Badge> <Badge minimal outlined>performance</Badge>
</Card>

</Cards>
