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Principal Engineer (Backend / Platform)

Blitzy

$300,000 - $500,000
Jan 2, 2026
Cambridge, MA, US
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Blitzy is looking to solve the problem of enabling thousands of AI Agents to 'think' and cooperate for hours to generate high-quality code at scale for enterprises, specializing in working with large-scale enterprise codebases and executing large-scale changes, aiming to deliver 3x-5x engineering velocity improvements to their enterprise customers.

Requirements

  • Python (primary language)
  • Backend frameworks and microservices architectures
  • RPC-based services (REST, gRPC)
  • Node.js and JavaScript (supporting languages)
  • Expertise across at least two of AWS, GCP, and Azure, with GCP mandatory
  • Expert-level Kubernetes experience for container orchestration in production environments
  • Terraform for infrastructure as code

Responsibilities

  • End-to-end ownership of production-grade backend systems used by enterprise customers
  • Correctness, scalability, performance, and operational reliability in real environments
  • Delivery and stewardship of high-impact features, not just incremental improvements
  • Building and improving Blitzy using Blitzy, holding the platform to real-world standards
  • Designing, operating, and evolving LLM validation loops to ensure correctness, consistency, and durability in production
  • Setting engineering quality and durability expectations across teams without direct reports
  • You independently own mission-critical production systems end-to-end

Other

  • 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.
  • We are looking for someone who has already operated at Principal / Staff+ scope in a highly technical environment and expects to spend their time writing, reviewing, and shipping production code.
  • This role is 100% hands-on.
  • You are a self-directed learner requiring minimal supervision