Principal Backend Engineer

About the role

We are hiring a Principal Engineer to take full, hands-on ownership of Blitzy's most critical production-grade systems and to deliver high-leverage features that materially improve customer outcomes and engineering velocity. This is the most senior individual contributor role at the company today. This is not a Senior-plus role, an architecture-only role, or a promotion-track role.

What you'll do

• Own mission-critical production systems end-to-end, ensuring correctness, scalability, performance, reliability, and operational excellence
• Design, build, and ship high-impact backend systems and features that improve product reliability, performance, and customer value
• Architect scalable services and cloud infrastructure using technologies such as Python, REST, gRPC, Kubernetes, and Terraform
• Identify and resolve complex technical bottlenecks that limit engineering quality, system performance, or organizational velocity
• Build and operate LLM-powered systems and validation loops that evaluate correctness, consistency, durability, and production performance

What you need

• 12–22 yrs of experience
• Python
• Node.js
• SQL
• JavaScript
• Kubernetes
• AWS
• Any graduate

Good to have

• PostgreSQL
• MongoDB
• Microservices
• LLMs
• gRPC
• NoSQL