One week you might prototype a new RL environment from a research paper, the next you’ll be deploying distributed experiments on Kubernetes, and the week after you’ll be improving the reliability of our Next.js dashboards or building a Kafka pipeline for annotator analytics.

What You’ll Do

• Design and build scalable systems: RL environments, APIs, and human-in-the-loop platforms.

• Collaborate across research, product, and design to ship features quickly.

• Write clean, maintainable code and contribute to documentation.

• Participate in code reviews and design discussions

• Solve real-world scalability and reliability challenges.

• Contribute to the core infrastructure powering data and evaluation for leading AI labs.

Tech stack

TypeScript/JavaScript, Next.jS, React, Node.js, Python, Kubernetes, Kafka, Redis, Elasticsearch, Cloud Platforms: AWS, GCP

Work experience(must have!)

1 -​ 3 years of experience as a fullstack SWE

Experience at S-​tier VC-​backed startup,​ reputable trading firm,​ or founding engineer at company that has raised $2.​5M+.​ If big tech only,​ must have CS degree from top-​10 CS program (e.​g.​,​ Berkeley,​ CMU).​

If candidate comes from a startup,​ startup MUST be HIGH GROWTH

Degree from top-​30 school.​

Fullstack capability:​ Next.​js/React,​ Node.​js/Python,​ Kubernetes

Experience building something end-​to-​end with a bias towards ownership

Willing to work 5 days a week (M-​F) and half-​day or remote on Sundays in our FiDi (SF) office .​

Why candidates should join

• AfterQuery is collaborating with all 5 leading AI labs (OpenAI, Anthropic, Google, Meta, Amazon)

• Candidates will recommend data and infrastructure that shapes next-generation agentic workflows, focusing on the hardest, most advanced problems to solve (not commodity)

• Work at a larger scale than most AI companies: Currently 8 figure revenue with hockey-stick growth trajectory

• Candidates will have outsized impact, shaping core systems from day 1

• Talent dense team with founders from top quantitative finance (Citadel Securities) and IB/PE (Goldman Sachs, Morgan Stanley, Silver Lake)

• YC Winter 2025: $3M raised, $40M cap, expecting $20-30M Series A shortly

• Fast-paced culture with open-communication and quick iteration and a tight-knit team that likes each other