# Member of Technical Staff, Research Engineer at Crosby

- Company: Crosby
- What the company does: Backed by Index, Sequoia and Lux.
- Company website: http://crosby.ai/
- Type: Startups (AI role)
- Level: Senior
- Location: New York City
- Work setup: On-site
- Pay: $200K to $300K base salary per year (USD)
- Posted: 2026-06-16
- Apply by: 2026-10-08
- Apply: https://jobs.ashbyhq.com/crosby/81acae55-8c8e-40d9-b601-7ba99e22a6e2
- Page: https://www.1752.vc/careers/jobs/crosby-member-of-technical-staff-research-engineer/

## About the role

As a Research Engineer, you'll bridge research and production. You'll turn validated methods, benchmarks, and evaluation infrastructure from our research team into dependable, production-grade features. You’ll be responsible for the entire lifecycle of an AI feature—from building the underlying systems to customizing the models that make them run. Your work will involve both robust system design and the pragmatic application of advanced machine learning techniques, including model fine-tuning when necessary.

## What they're looking for

- Experience: 3+ years of professional software engineering experience building and shipping AI/ML-powered products, with deep proficiency in Python and a proven track record of scalable, production-grade systems
- Post-training expertise: Familiarity with post-training techniques such as SFT and GRPO, plus hands-on experience with the systems and frameworks that run them at scale—distributed model training, VERL, and vLLM
- Practical AI skills: Hands-on experience with LLM APIs (e.g., OpenAI, Anthropic), RAG, agentic workflows, and the full ML project lifecycle
- Analytical and pragmatic: A data-driven approach to problem solving and strong intuition for when to build complex infrastructure versus ship a simple solution
- Product-focused: Driven by user impact and skilled at making smart technical trade-offs to deliver value quickly
- Ownership: You thrive on taking full responsibility for features, from initial concept through deployment and iteration

Tags: Engineering