# AI Engineer — Research Agents (Full-Stack) at Sixtyfour

- Company: Sixtyfour (YC P25)
- What the company does: Intelligence Infrastructure on People and Entities. Backed by Y Combinator.
- Company website: https://www.sixtyfour.ai/
- Type: Startups (AI role)
- Level: Mid level
- Location: San Francisco, CA, US
- Work setup: On-site
- Pay: $120K to $200K base salary per year (USD)
- Posted: 2025-08-25
- Apply by: 2026-10-08
- Apply: https://www.ycombinator.com/companies/sixtyfour/jobs/MeTMrLQ-ai-engineer-research-agents-full-stack
- Page: https://www.1752.vc/careers/jobs/sixtyfour-ai-engineer-research-agents-full-stack/

## About the role

AWS + Temporal in production (at least two of: ECS/EKS, Lambda, SQS/SNS, Batch, Step Functions, CloudWatch).

## What they're looking for

- Hands-on experience with agentic architectures (tool calling, structured outputs/JSON, planning/execution loops) and prompt engineering
- Deep knowledge of OpenSearch/Elasticsearch : index design, analyzers, ingestion pipelines, snapshots, rolling upgrades, and zero-downtime reindexing/data migrations
- Proven web scraping expertise: solving CAPTCHAs, session/auth flows, proxy rotation, stealth techniques, and legal/ethical constraints
- Building high-throughput data/IO pipelines with concurrency (asyncio/multiprocessing), resilient retries, and rate-limit aware scheduling
- Integrating diverse external APIs (auth patterns, pagination, webhooks), designing stable interfaces and backfills
- Strong data wrangling with Pandas or equivalent, comfort with large CSV/Parquet workflows and memory/perf tuning

Tags: Engineering