Senior Backend Engineer (AI Platform)
AZX · Remote · United States ·
COMPENSATION
$140k – $230k
Listed on the employer's job board (Ashby)
- Senior Backend Engineer
- Fully remote (US)
- Python + Postgres
- LLM Infrastructure
- No visa sponsorship
You will engineer the backend services powering AZX's physics-informed ML and enterprise AI solutions. The work centers on LLM infrastructure, including governed access to models, cost tracking, and compliance. You will support internal client-facing engineers with concrete requirements and rapid feedback loops.
What you'll do
- Own the LLM gateway including routing, metering, budgets, and provider adapters
- Manage retrieval and knowledge services with hybrid search and reranking
- Build evaluation harnesses to turn tuning into evidence with confidence intervals
- Develop async framework APIs, rate-limiting, and durable execution for agents
- Design authorization systems with token hierarchies and per-tenant isolation
- Define completion standards including evals, traces, and cost accounting dashboards
What you'll need
- 5+ years of production experience with async Python and streaming lifecycles
- Deep knowledge of Postgres infrastructure including MVCC and advisory locks
- Experience shipping API surfaces with versioning and migration discipline
- Expertise in LLM gateway concerns or retrieval engineering and RAG methodology
- Proficiency with Python 3.12+, FastAPI, Pydantic v2, and asyncpg/SQLAlchemy
- Familiarity with OpenTelemetry, SSE, and job frameworks like Celery or Prefect
- Must be authorized to work in the United States full-time
Nice to have
- Previous work in energy, real estate, utilities, or climate sectors
- Experience working in both startup and enterprise environments
- Knowledge of Redis or Dragonfly with Lua scripting
Stack
- Python 3.12+
- FastAPI
- Starlette
- Pydantic v2
- Postgres
- pgvector
- Redis
- Dragonfly
- OpenTelemetry
How you'll work
- Fully remote culture with team cluster in Seattle
- Must travel to Seattle for final interview
- Travel twice yearly for company summits
- No visa sponsorship available
What you get
- Competitive early-stage startup compensation
- Bonus eligibility
- Health insurance with dependent coverage
- Flexible paid time off
- Equity package
Hiring process
- Apply to a maximum of two roles at a time
- Final interview requires travel to Seattle area