# Software Engineer - Platform Infrastructure at AfterQuery

- Company: AfterQuery
- What the company does: AfterQuery captures how experts reason and turns real-world professional work into high-quality training data for frontier foundation models. Backed by Y Combinator.
- Company website: https://afterquery.com
- Type: Startups (AI role)
- Level: Mid level
- Location: San Francisco
- Work setup: On-site
- Pay: $250K to $350K base salary per year (USD)
- Posted: 2026-03-08
- Apply by: 2026-10-08
- Apply: https://jobs.ashbyhq.com/afterquery/c33f01ac-783a-4ab3-9efe-d29a060c4524
- Page: https://www.1752.vc/careers/jobs/afterquery-software-engineer-platform-infrastructure/

## About the role

As a Software Engineer - Platform Infrastructure at AfterQuery, you will design and build the core infrastructure that powers our data generation, evaluation, and agentic systems. You will be responsible for the shared platforms that enable our engineers and research teams to run large-scale human-in-the-loop workflows, evaluation harnesses, and automated data pipelines used to train frontier AI models. This is a highly technical role with broad ownership.

## What they're looking for

- Strong experience building production distributed systems or platform infrastructure
- Proficiency in Python and/or JavaScript (Node.js / Next.js) or similar backend technologies
- Experience designing and operating systems in cloud environments (GCP or AWS)
- Experience with message queues and event-driven systems (Kafka, RabbitMQ, Pub/Sub, etc.)
- Experience working with high-throughput data pipelines and asynchronous processing systems
- Strong understanding of system scalability, performance, and reliability

Tags: Engineering