AI Engineer

### **About Sixtyfour**

Sixtyfour is a data orchestration engine for company and people data. Our AI agents specialize in enriching detailed datapoints about individuals and organizations, gathering information from both public and proprietary sources. We enable enterprise customers to build custom data pipelines that help them find, enrich, qualify, and act on company-specific requirements for people and business data.

**Our Mission**

To power how enterprises understand and act on people and companies with world-class intelligence.

### **What you’ll do**

* Design and ship agentic systems (tool calling, multi-agent workflows, structured outputs) that reliably fetch, extract, and normalize data across the web and APIs.
* Own robust web scraping: directory crawling, CAPTCHA handling, headless browsers, rotating proxies, anti-bot evasion, and backoff/retry policies.
* Develop backend services in **Python + FastAPI** with clean contracts and strong observability.
* Scale workloads on **AWS + Docker** (batch/queue workers, autoscaling, fault tolerance, cost control).
* Parallelize external API requests safely (rate limits, idempotency, circuit breakers, retries, dedupe).
* Integrate third-party APIs for enrichment and search; model and cache responses; manage schema evolution.
* Transform and analyze data using **Pandas** (or similar) for normalization, QA, and reporting.
* Pitch in across the stack: billing (Stripe), and occasional front-end changes to ship end-to-end features.

### **Minimum requirements**

* Hands-on experience with **agentic architectures** (tool calling, structured outputs/JSON, planning/execution loops) and prompt engineering.
* Proven **web scraping** expertise: solving CAPTCHAs, session/auth flows, proxy rotation, stealth techniques, and legal/ethical constraints.
* **AWS + Docker** in production (at least two of: ECS/EKS, Lambda, SQS/SNS, Batch, Step Functions, CloudWatch).
* 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.
* Excellent ownership, product sense, and pragmatic debugging.

### **Nice to have**

* Entity resolution/record linkage at scale (probabilistic matching, blocking, deduping).
* Experience with **Langfuse**, OpenTelemetry, or similar for tracing/evals; task queues (Celery/RQ), Redis, Postgres.
* Search relevance (BM25/vector/hybrid), embeddings, and retrieval pipelines.
* Playwright/Selenium, stealth browsers, anti-bot frameworks, CAPTCHA providers.
* CI/CD, infrastructure as code (Terraform), and cost/perf observability.
* Security & compliance basics for data handling and PII.