Founding Engineer

Rainbrand, San Francisco, California

The role

Bloom is the brand layer for agents. It turns a brand’s identity, guidance, and assets into shared context that agents and products can use. That context evolves with the brand, alongside the tools where it is created and managed.

We’re a three-person, YC-backed team building this infrastructure from the ground up.

We're looking for an engineering generalist with depth in backend and AI systems. You'll help decide what to build, shape the architecture, and own what you ship in production. The immediate work centers on agents, data, and infrastructure, with room to follow a problem wherever it leads across engineering.

This is a full-time, in-person role in San Francisco. We're building our core team here. Visa support is available.

What you will do

All jobs

Founding Engineer

Rainbrand, San Francisco, California

Posted pay

$140K–$200K

a year

Compared with similar jobs

This base pay is below the median for software engineering jobs in the Bay Area with no level in the job title.

Median: $197K a year
Other jobs in the group: 2,442

We compare the middle of each posted range. This is base pay as posted. The group does not include this job.

Location: San Francisco, California
Work type: Not given
Level: Not given
Posted: Oct 3, 2026
Last check: 4 h ago
Job type: Software engineering
Visa sponsorship: The job text says that the company can sponsor a visa. Confirm this with the company.

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The role

We’re a three-person, YC-backed team building this infrastructure from the ground up.

This is a full-time, in-person role in San Francisco. We're building our core team here. Visa support is available.

What you will do

What you need

You have strong fundamentals and production depth. You've built and operated backend and AI systems that people depend on. You can explain what you personally designed, why you made those choices, what broke, and how you fixed it.
You understand how the parts of a system fit together, reduce scope and complexity, and build primitives that remain useful as the product grows. You can ship a small, correct first version without losing sight of what it needs to become.
You have product and customer judgment. You understand who or what will use what you build, question whether it solves the right problem, and are comfortable talking directly with customers to improve the product.
AI tools are a substantial part of how you build. You still understand the code, scrutinize the result, and take responsibility for its correctness and maintainability.
You question requirements and explain your reasoning. You're comfortable with direct technical discussion, defending a decision, and changing your mind when the evidence is better. You care more about getting it right than being right.
You move with urgency and follow through. You make progress through ambiguity, surface problems early, and stay with difficult work through production.
You have low ego and high integrity. You're candid about what you know, own your mistakes, and treat teammates with respect. People can rely on your word.
You care about craft and taste. You want to understand what makes creative work good and how software can preserve the decisions that make a brand distinct.

Show us what you've built

We're especially interested in

Early-stage startup or founding-team experience, with meaningful responsibility for the systems you shipped.
Open-source contributions, personal projects, or public technical work that shows curiosity and depth.
Thoughtful engagement with developments in AI and engineering, whether through GitHub, X, a blog, or elsewhere. You explore new tools and ideas and can explain which ones matter.
Experience building agents, brand or creative tools, or multimedia and multimodal systems.
Work on document intelligence, data processing, crawling, indexing, search, retrieval, or developer infrastructure.

Founding Engineer

The role

What you will do

Founding Engineer

The role

What you will do

What you need

We're especially interested in

About Rainbrand

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