Backend Engineer - Python

Valiant Technologies LLC; Dallas (TX); On-site; USD 140,000 - 190,000; Full time

Job summary

VALIANT TECHNOLOGIES LLC in Dallas is seeking a senior backend engineer to develop and maintain the AI agent infrastructure, including APIs, scrapers, and data connectors. You will implement orchestration using LangChain and similar frameworks, and build robust RAG pipelines with vector databases.

You will manage asynchronous workloads with FastAPI/Asyncio and contribute to secure REST/GraphQL APIs, while enforcing guardrails and secure deployment practices on AWS/Azure/GCP.

Qualifications

• 8+ years of professional Python experience with FastAPI, Pydantic, and asyncio.
• Hands-on experience with LangChain or LlamaIndex.
• Proficient in PostgreSQL and vector databases.
• Experience deploying containerized apps with Docker and Kubernetes on cloud platforms.
• Understanding of distributed systems and high latency / compute needs of LLM apps.
• Mastery of Git and CI/CD practices.

Responsibilities

• Develop and maintain backend tools, APIs, scrapers, and data connectors used by AI agents.
• Implement orchestration with LangChain, LangGraph, or CrewAI for complex reasoning and multi-agent coordination.
• Build and optimize RAG pipelines with vector databases to ensure context availability.
• Handle asynchronous task management using FastAPI/Asyncio and task queues like Celery or Redis.
• Design secure, high-performance REST/GraphQL APIs connecting backend to frontend.
• Implement backend safety guardrails to ensure autonomous agent actions stay within policy/ethics.

Skills

Python

FastAPI

Asyncio

Pydantic

LangChain

LlamaIndex

PostgreSQL

Vector Databases

Docker

Kubernetes

AWS

Azure

GCP

Git

CI/CD

Distributed Systems

Tools

LangChain

LlamaIndex

PostgreSQL

Vector Databases

Docker

Kubernetes

AWS

Azure

GCP

Git

CI/CD

FastAPI

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.

VALIANT 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. VALIANT 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 VALIANT 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