LLM Applications Engineer

Uncountable Inc.

San Francisco, New York (CA, NY)

Hybrid

USD 130,000 - 175,000

Full time

14 days+

Application generator

An application made for this job — a tailored resume and cover letter that speak straight to the posting.

Get past ATS filters

Benefits offered by this job

Competitive Salary and Equity

Health and Dental Insurance

401K with Employer Contribution

Job summary

A leading tech company in San Francisco is seeking an LLM Applications Engineer to design and scale AI-driven features for their platform. This role requires expertise in full-stack development and LLM orchestration frameworks like LangChain. The successful candidate will implement advanced pipelines and build intuitive user interfaces, enabling scientists to maximize their discovery processes. Competitive salary and benefits package available, including health insurance and 401K with employer contribution.

Qualifications

2+ years of software development experience, especially in full-stack.
Experience with LLM orchestration frameworks like LangChain.
Ability to work across backend and front-end with Python and JavaScript.

Responsibilities

Design, build, and scale LLM infrastructure and AI features.
Implement RAG pipelines, vector databases, and prompt management systems.
Build AI-driven UI for data analysis and visualization.

Skills

Full-stack web development

LLM orchestration frameworks

Python

JavaScript/TypeScript

API design

Performance optimization

Education

B.S. in Computer Science or related field

Tools

Flask

Postgres

React

Redux

Sass

Job description

Thank you for your interest in Uncountable Engineering!

Description

Uncountable is seeking experienced engineers to lead the transformation of our platform into an AI-first R&D ecosystem. We are building the next generation of tools that empower scientists at Fortune 500 companies to accelerate discovery through Generative AI.

As an LLM Applications Engineer, you will be the architect of our LLM infrastructure. You won't just be building interfaces; you will be designing the retrieval systems, agentic workflows, and data pipelines that bridge the gap between complex experimental data and actionable AI insights. Your work will directly modernize how the world’s leading researchers interact with their data.

Primary Responsibility

Your primary responsibility is to design, build, and scale the LLM infrastructure and user-facing AI features of the Uncountable Web Platform. This is a hybrid role requiring a deep understanding of full-stack development and the unique challenges of deploying LLMs in production.

Infrastructure: Implement and optimize RAG (Retrieval-Augmented Generation) pipelines, vector databases, and prompt management systems.
Feature Development: Build intuitive, AI-driven UI components that allow scientists to query, analyze, and visualize complex experimental datasets.
Integration: Connect LLM capabilities with our core SQL databases and data analysis engines to ensure high-fidelity, grounded AI responses.

Salary Range: $130K–$175K + Equity

Requirements

2+ years of software development experience with a focus on full-stack web applications.
Proven experience with LLM orchestration frameworks (e.g., LangChain, LlamaIndex, or Haystack).
Proficiency in Python and JavaScript/TypeScript: Ability to work across the AI backend and the React frontend.
Solid Engineering Fundamentals: Experience with API design, asynchronous processing, and performance optimization.

Preferred Qualifications

B.S. in Computer Science or a related technical field.
Experience with LLM Evaluation: Knowledge of how to measure and mitigate "hallucinations" in a scientific/technical context.
Familiarity with SQL: Specifically optimizing queries that serve as the context for LLM prompts.
Product Mindset: A passion for creating "LLM-first" user experiences that feel seamless rather than bolted-on.

Our Current Stack