Principal Software Engineer

Cambridge, MA. Posted a month ago

The role

The Principal Engineer will take full, hands-on ownership of critical production-grade systems. This role involves designing, building, and shipping high-impact backend systems and LLM-powered systems.

What you will do

Own mission-critical production systems end-to-end
Design, build, and ship high-impact backend systems and features
Architect scalable services and cloud infrastructure
Identify and resolve complex technical bottlenecks
Build and operate LLM-powered systems and validation loops
Design and evolve data architectures
Modernize and improve complex enterprise systems
Set and uphold engineering quality standards

Required qualifications

Direct experience with Python as a primary programming language, backend frameworks, and microservices architectures
Expertise in REST and gRPC, with proficiency in Node.js and JavaScript
Proficiency in AWS, along with experience using at least one additional cloud platform such as GCP or Azure
Advanced knowledge of Kubernetes and Terraform in production environments
Experience operating highly available production systems
Strong knowledge of SQL and NoSQL databases, including PostgreSQL, MySQL, MongoDB, Cassandra, or DynamoDB
Familiarity with graph databases such as Neo4j and vector databases or embedding infrastructure for semantic search and retrieval
Hands-on experience building and operating LLM-powered systems in production
Ability to contribute across the full stack
Understanding of large-scale enterprise software systems
Proven track record of operating at Staff+, Principal Engineer, or comparable scope

Nice to have

Working knowledge of LangSmith or comparable LLM observability and evaluation tools
Familiarity with OpenAI, Anthropic, or similar model providers

About the company

Blitzy is a Cambridge, MA based AI software development platform. It uses an agentic software development platform to autonomously build custom software for enterprises.