Member of Technical Staff - Backend & Infrastructure

janitorAI; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

janitorAI in San Francisco is seeking an engineer to build AI interactive entertainment. The role involves improving product features deeply wired into our AI stack and enhancing performance, reliability, and user experience.

The ideal candidate will tackle complex problems and have experience with systems like Kubernetes. If you are passionate about product impact and thrive on real user feedback, this position is for you.

Qualifications

• You care about the product, not just the infrastructure.
• You enjoy solving hard systems problems with real user impact.
• You can turn vague problems into actionable solutions.

Responsibilities

• Work on product features integrated into our AI stack.
• Improve system performance by solving infrastructure issues.
• Understand the system from the user experience to the machine level.

Skills

Problem-solving with a focus on user experience

Experience with distributed systems

Familiarity with Kubernetes

Understanding of machine performance

Job description

Janitor is building AI interactive entertainment for millions of people. Every day our users create characters, worlds, stories, and relationships with AI, and making that feel fast, reliable, and alive takes serious infrastructure. We are looking for an engineer who wants to help own that whole stack.

We run more of our own than most companies our size. The direction is more owned infrastructure, not more AWS glue.

What you'll work on

• Product features wired deep into our AI stack
• Making the whole thing faster, cheaper, simpler, and harder to kill

Infra problems here rarely look like infra problems. They show up as product bugs, a slow page, a delayed job, a websocket reconnect, a cache path that worked until it did not. The job is to understand the system from the user experience down to the machine, then make it better.

You might be a good fit if

• You care about the product, not just the infrastructure
• You like hard systems problems with real users on the other side
• You have strong taste and hate overbuilt software
• You can take a vague problem and turn it into something real
• You learn fast and will own things you have never touched before

Experience with Kubernetes, distributed systems, or GPUs helps, but it is not a checklist, we care more about how you think and what you have built than how well your resume matches our tools.