Founding Backend Engineer — AI for Life Sciences

Praxis, Inc.; New York (NY); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Equity package

Health insurance

Unlimited PTO

Learning stipend

Job summary

Atrix is building AI-powered life sciences infrastructure in NYC. As a Backend Engineer, you will design and own major modules of our backend architecture, APIs, and AI-enabled workflows.

You'll work on scalable data pipelines, real-time inference systems, and secure, multi-tenant backends while collaborating across product and AI teams. We’re an early team, offering equity and a fast-growth environment with remote-friendly days.

Qualifications

• 5+ years backend engineering experience in fast-paced product teams
• 2+ years of Python experience, including async programming
• Expertise with one or more frameworks: FastAPI, Flask, Django
• Strong experience with SQL (PostgreSQL) and ORMs (SQLAlchemy or equivalent)
• Experience building APIs, background workers, and distributed systems
• Understanding of how LLMs, embeddings, or RAG workflows function
• Startup experience or demonstrated ownership in complex backend projects

Responsibilities

• Design and own major modules of our backend architecture (APIs, workers, orchestration)
• Optimize performance and reliability of data processing and AI inference systems
• Build and maintain LLM-powered backend features and multi-step workflows
• Collaborate with product and AI teams to launch production-grade AI features
• Improve observability, traceability, and modularity of backend systems
• Lead customer-focused feature delivery with high attention to security and compliance

Skills

Backend engineering

Python (async)

FastAPI

PostgreSQL

SQLAlchemy

APIs

LLMs

RAG workflows

Startup experience

Celery

LangChain

LlamaIndex

AWS

Terraform

Kafka

PyTorch

Tools

Celery

LangChain

LlamaIndex

AWS

Terraform

Kafka

PyTorch

Job description

Atrix is building AI-powered life sciences infrastructure in NYC. As a Backend Engineer, you will design and own major modules of our backend architecture, APIs, and AI-enabled workflows.

You'll work on scalable data pipelines, real-time inference systems, and secure, multi-tenant backends while collaborating across product and AI teams. We’re an early team, offering equity and a fast-growth environment with remote-friendly days.