Backend Engineer - Python

Ethereum Technologies LLC; Dallas (TX); On-site; USD 120,000 - 190,000; Full time

Job summary

Ethereum Technologies LLC in Dallas seeks a senior backend engineer to build and maintain the tools and APIs powering AI agents. You will focus on reliability, performance, and scalable orchestration using LangChain or LangGraph, while optimizing data ingestion with vector databases.

You will implement secure REST/GraphQL interfaces and ensure guardrails for autonomous agent actions, leveraging FastAPI, asyncio, and modern cloud deployments.

Qualifications

• 8+ years of professional experience with Python, specifically FastAPI, Pydantic, and Asyncio.
• Hands-on experience with LangChain or LlamaIndex.
• Proficiency with PostgreSQL and Vector Databases.
• Experience deploying containerized apps using Docker and Kubernetes on AWS, Azure, or GCP.
• Understanding of distributed systems and high latency/compute needs of LLM-based apps.
• Mastery of Git and CI/CD best practices.
• Knowledge of Prompt Engineering and AI observability tools is a plus.

Responsibilities

• Develop and maintain backend tools, APIs, scrapers, and database connectors for AI agents.
• Implement orchestration using LangChain, LangGraph, or CrewAI for multi-agent coordination.
• Build and optimize RAG pipelines with vector databases for proper context retrieval.
• Manage asynchronous tasks with FastAPI/Asyncio and Redis/Celery.
• Design secure, high-performance REST or GraphQL APIs between backend and frontend.
• Implement backend safety guards and governance for autonomous agent actions.

Skills

Python

FastAPI

Pydantic

Asyncio

LangChain

LlamaIndex

PostgreSQL

Vector Databases

Docker

Kubernetes

AWS

Azure

GCP

Git

CI/CD

Tools

PostgreSQL

Vector Databases

Docker

Kubernetes

AWS

Azure

GCP

Git

CI/CD

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.

ETHEREUM 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. ETHEREUM 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 ETHEREUM 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