[Remote] LLM Platform Engineer at WhatNot

San Francisco, California, United States

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$225,000 – $320,000Compensation

Senior (5 to 8 years), Expert & Leadership (9+ years)Experience Level

Full TimeJob Type

UnknownVisa

E-commerce, Technology, MarketplaceIndustries

Requirements

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+ years 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 PostgreSQL, DynamoDB, Elasticsearch, Redis
Firm grasp of visualization tools for monitoring and logging e.g. DataDog, 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
US Based: Must live within commuting distance of New York, Seattle, Los Angeles, or San Francisco hubs

Responsibilities

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

Skills

Key technologies and capabilities for this role

LLMAIMLInfrastructureRetrieval SystemsLLM EvaluationHuman-in-the-LoopScalable SystemsProduction Deployment

Questions & Answers

Common questions about this position

What is the salary range for the LLM Platform Engineer role?

The salary range is $225K - $320K.

Is this position fully remote, or are there location requirements?

The role is remote but requires team members to live within commuting distance of our New York, Seattle, Los Angeles, and San Francisco hubs, with flexibility to work from home or global office hubs and value in-person time.

What experience and skills are required for this position?

Candidates should have 4+ years of professional experience as intellectually curious, highly entrepreneurial engineers with expertise in designing and scaling LLM infrastructure, including RAG systems, evaluation frameworks, and human-in-the-loop feedback.

What is the company culture like at Whatnot?

Whatnot fosters a culture of low ego, growth mindset, leaning into action and high impact, with a remote co-located team inspired by innovation and anchored in values, valuing in-person time for planning and connection.

What makes a strong candidate for this LLM Platform Engineer role?

Strong candidates are builders who are intellectually curious, highly entrepreneurial, with 4+ years of experience, a low ego, growth mindset, and eagerness to take on new technical challenges in AI/ML infrastructure.

WhatNot

Online marketplace for authentic collectibles

About WhatNot

Whatnot.com operates as an online marketplace dedicated to collectibles, particularly focusing on items like Funkos and FiGPiNs. The platform ensures that every collectible listed is 100% authentic through a rigorous verification process that includes hand authentication, providing trust and security for both buyers and sellers. It caters to collectors and enthusiasts who seek a reliable space to buy and sell rare and exclusive items from popular franchises such as Marvel Comics and Star Wars. Whatnot.com distinguishes itself from competitors by charging low fees on sales and offering seller protection, which guarantees prompt and secure payments. The company's goal is to create a trusted environment for the growing community of collectible enthusiasts, facilitating safe and easy transactions for unique items.

Marina del Rey, CaliforniaHeadquarters

2019Year Founded

$728.7MTotal Funding

SERIES_ECompany Stage

Consumer Software, Consumer GoodsIndustries

501-1,000Employees

Benefits

Competitive base salary and stock options

Unlimited Vacation Policy and No Meeting Holidays

Health Insurance options including Medical, Dental, Vision, Life, Short term disability & Long term Disability

Work From Home Support

Up to $500 monthly to spend within Whatnot App

Care benefits

Risks

Increased competition from TikTok Shop may impact Whatnot's market share.

The collectibles market's volatility could affect Whatnot's sales and inventory.

Expansion into new categories may dilute Whatnot's specialized brand identity.

Differentiation

Whatnot offers a unique marketplace for 100% authenticated collectible items.

The platform integrates live shopping with entertainment, enhancing user engagement.

Whatnot's partnerships with major franchises like Marvel boost its market appeal.

Upsides

Whatnot's $265M funding round supports expansion and new product categories.

The platform's collaboration with PSA enhances trust through integrated authentication services.

Rising interest in live shopping among younger demographics drives Whatnot's growth.

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