LLM Platform Engineer

Job Overview

We’re looking for builders–intellectually curious, highly entrepreneurial engineers eager to shape the future of AI and ML ’ll design and scale the core infrastructure that powers large language model applications across the company, working side by side with machine learning scientists to bring cutting‑edge models into production and unlock entirely new product experiences. This means building systems that make AI dependable and fast at scale—from building retrieval systems to more effectively ground LLM responses in Whatnot’s business context to developing scalable LLM evaluation frameworks and human‑in‑the‑loop feedback mechanisms.

• Own the infrastructure powering LLMs across critical business surfaces–supporting growth, recommendations, trust and safety, fraud, seller tooling, and more.
• Create robust and scalable LLM evaluation frameworks to measure model performance, guide iteration, and prevent regression via CI/CD.
• Deploy RAG systems and MCP servers to more effectively ground LLM responses in Whatnot’s business context while enforcing rigorous PII controls.
• Design efficient human‑in‑the‑loop feedback pipelines that can be used to inform scalable LLM evaluation.
• Bridge the gap between research and production, helping to transform experimental ideas into scalable solutions.
• Stretch beyond your comfort zone to take on new technical challenges as we scale AI across Whatnot’s ecosystem.

• 4+ years of professional experience developing machine learning systems and algorithms.
• Bachelor’s degree in Computer Science, Statistics, Applied Mathematics or a related technical field, or equivalent work experience.
• 3+ years of software engineering experience building and maintaining production systems for consumer‑scale loads.
• 1+ year of professional experience developing software in Python.
• Ability to work autonomously and drive initiatives across multiple product areas and communicate findings with leadership and product teams.
• Experience with operational, search, and key‑value databases such as Postgre
  
  SQL, Dynamo
  
  DB, Elasticsearch, Redis.
• Firm grasp of visualization tools for monitoring and logging (e.g., Data Dog, Grafana).
• Familiarity with cloud computing platforms and managed services such as AWS Sagemaker, Lambda, Kinesis, S3, EC2, EKS/ECS, Apache Kafka, Flink.
• Professionalism around collaborating in a remote working environment and well‑tested, reproducible work.
• Exceptional documentation and communication skills.

For U.S.‑based applicants: $225,000 – $320,000 / yr + benefits + stock options. The salary range is inclusive of multiple levels; final salary will depend on level, experience, and expertise. This range is only inclusive of base salary, not benefits or equity.

• Flexible Time off Policy and Company‑wide Holidays (including a spring and winter break)
• Health Insurance options including Medical, Dental, Vision
• Work From Home Support
  • Home office setup allowance
  • Monthly allowance for cell phone and internet
• Care benefits
  • Monthly allowance for wellness
  • Annual allowance towards childcare
  • Lifetime benefit for family planning, such as adoption or fertility expenses
• Retirement; 401k offering for Traditional and Roth accounts in the U.S. (employer match up to 4% of base salary) and pension plans internationally
• Monthly allowance to dogfood the app
  • All Whatnauts are expected to develop a deep understanding of our product. We're passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!).
• Parental Leave
  • 16 weeks of paid parental leave + one month gradual return to work. Company leave allowances run concurrently with country leave requirements which take precedence.

Whatnot is proud to be an Equal Opportunity Employer. We value diversity, and we do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability status, or any other status protected by local law. We believe that our work is better and our company culture is improved when we encourage, support, and respect the different skills and experiences represented within our workforce.

$/yr – $/yr