Rindler YC Application

Summer 2026Active

San Francisco

Rindler went through Y Combinator in the Summer 2026 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Summer 2026
Industry: B2BEngineering, Product and Design
Location: San Francisco
Team size: 2
Status: Active
Launched: 2026

Founders

Michael SerranoFounder/CEO
Arthur De Los SantosFounder/CTO

What Rindler does

We build Maxxwell, a desktop app for people who run several coding agents at once. Past two or three sessions, you become the bottleneck. Every session asks you something, most of it small, and you spend the day answering instead of deciding. It is also hard to tell which sessions are making progress, which are stuck on something trivial, and which have quietly started building the wrong thing. Maxxwell puts every session in one window and marks each one working, idle, or waiting on you. On top of that sits an orchestrator, a real coding-agent session of its own that reads the others and reports back. You talk to it instead of to twelve terminals. It tells you what landed, what it decided for you, and what actually needs your call. Every worker is your own tool, unmodified. Claude Code, Codex and Cursor Agent run in real terminal sessions you can attach to and take over at any point

Rindler's YC application, reconstructed

Y Combinator application

Rindler, Summer 2026 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Rindler

Describe what your company does in 50 characters or less.

The IDE for Tokenmaxxers

What is your company going to make? Please describe your product and what it does or will do.

We make Maxxwell, a desktop app for developers who run several coding agents at once. Maxxwell shows every coding agent session in one window and tracks which ones are working, idle, or waiting on you. An orchestrator session reads the others and summarizes what happened, what's stuck, and what needs your input. Every agent is your own tool - Claude Code, Codex, Cursor Agent - running in real terminal sessions you can take over at any time.

Where do you live now, and where would the company be based after YC?

We live in San Francisco, and Rindler would stay based here after YC.

Explain your decision regarding location.

We're in San Francisco because that's where most of our early users are and it's the center of developer tools and AI. Staying here keeps us close to users and the best technical talent.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Rindler YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Rindler's public data (launch notes, founder backgrounds, product description). It shows how a company like Rindler would present itself to YC, not the text they submitted.