Backend Engineer - Python

Quantum Technologies. LLC; Dallas, Northern (TX, KY); Hybrid; USD 140,000 - 210,000; Full time

Job summary

Quantum Technologies LLC in Dallas seeks an experienced backend engineer to design and maintain the systems powering AI agents. You will build APIs, data connectors, and tooling used across the platform.

You will implement orchestration with LangChain and related frameworks, optimize vector-based data pipelines, and ensure secure, scalable cloud deployments. Candidates should have 8+ years in Python, hands-on with FastAPI, Pydantic, Asyncio, and experience with LangChain/LlamaIndex; strong

Qualifications

• 8+ years of professional Python development experience.
• Hands-on with FastAPI, Pydantic, and Asyncio.
• Experience with LangChain or LlamaIndex.
• Proficient in PostgreSQL and vector databases.
• Experience deploying on AWS/Azure/GCP and CI/CD.

Responsibilities

• Develop and maintain backend tools and APIs used by AI agents.
• Implement orchestration with LangChain, LangGraph, or CrewAI.
• Build and optimize RAG data ingestion and retrieval pipelines with vector databases.
• Manage asynchronous tasks using Asyncio, FastAPI, Celery, or Redis.
• Design secure, high-performance REST or GraphQL APIs between backend and frontend.
• Implement backend safety guards and validation to keep autonomous actions within policy.

Skills

Python

FastAPI

Asyncio

LangChain

LlamaIndex

PostgreSQL

Vector Databases

Docker

Kubernetes

AWS

Azure

GCP

REST APIs

GraphQL

Git

CI/CD

Celery

Redis

LangGraph

CrewAI

LangSmith

Arize Phoenix

Security & Guardrails

Tools

Docker

Kubernetes

Git

CI/CD

Pydantic

REST APIs

GraphQL

Celery

Redis

LangChain

LlamaIndex

LangSmith

Arize Phoenix

Job description

• Agent Logic & Tooling:Develop and maintain the backend "tools" (APIs, scrapers, database connectors) that AI agents use to perform tasks.
• Orchestration Implementation:Use frameworks likeLangChain, LangGraph, or CrewAIto implement complex reasoning chains and multi-agent coordination.
• RAG Pipeline Engineering:Build and optimize data ingestion and retrieval systems usingVector Databases, ensuring the agent has the right context at the right time.
• Asynchronous Task Management:Manage long-running AI reasoning cycles using asynchronous Python (FastAPI/Asyncio) and task queues like Celery or Redis.
• API Architecture:Design and implement secure, high-performance REST or GraphQL APIs that serve as the interface between the agentic backend and the frontend.
• Safety & Guardrails:Implement backend-level validation and guardrails to ensure that autonomous agent actions remain within secure and ethical boundaries.

Technical Requirements

• Python Expertise:8+ years of professional experience withPython, specifically withFastAPI, Pydantic, and Asyncio.
• AI Frameworks:Hands-on experience withLangChainorLlamaIndex.
• Database Management:Proficiency inPostgreSQLand experience withVector Databases.
• Cloud & DevOps:Experience deploying containerized applications usingDockerandKuberneteson AWS, Azure, or GCP.
• Scalability:Understanding of distributed systems and how to handle the high latency and compute requirements of LLM-based applications.
• Version Control:Mastery of Git and CI/CD best practices.

Preferred Qualifications

• Knowledge ofPrompt Engineeringfrom a programmatic perspective (dynamic prompt templating).
• Familiarity with observability tools for AI, such asLangSmithorArize Phoenix.

QUANTUM TECHNOLOGIES LLC is an equal opportunity employer inclusive of female, minority, disability and veterans, (M/F/D/V). Hiring, promotion, transfer, compensation, benefits, discipline, termination and all other employment decisions are made without regard to race, color, religion, sex, sexual orientation, gender identity, age, disability, national origin, citizenship/immigration status, veteran status or any other protected status. QUANTUM TECHNOLOGIES LLC will not make any posting or employment decision that does not comply with applicable laws relating to labor and employment, equal opportunity, employment eligibility requirements or related matters. Nor will QUANTUM TECHNOLOGIES LLC require in a posting or otherwise U.S. citizenship or lawful permanent residency in the U.S. as a condition of employment except as necessary to comply with law, regulation, executive order, or federal, state, or local government contract