Principal Software Engineer

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

This role demands strong, hands-on experience across the full technology stack. You should have deep expertise in most of the following:

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

Production systems: monitoring, reliability, scalability, and operational tooling

Strong expertise across both SQL and NoSQL databases

SQL: PostgreSQL, MySQL, or similar relational databases

NoSQL: MongoDB, Cassandra, DynamoDB, or similar

Graph databases (Neo4j) for modeling and searching complex relationships

Vector databases / embeddings infrastructure for semantic search and retrieval

Experience building and operating LLM-powered systems in production

Designing and implementing LLM validation loops (evaluation, feedback, regression testing, and failure analysis)

LangSmith (or equivalent tooling) for tracing, evaluation, and debugging

Familiarity with specific models or vendors (e.g., OpenAI, Anthropic) is a plus

Strong understanding of frontend frameworks and architecture

Ability to evaluate and contribute to frontend technical decisions

Demonstrated technical expertise across the full stack — you can debug, design, and ship across frontend, backend, infrastructure, and AI layers

Core understanding of how large-scale enterprise systems are designed, integrated, deployed, and operated

Experience working within — or modernizing — complex, long-lived production environments

Prior experience operating at Principal Engineer / Staff+ scope at a highly technical company

Deep understanding of how enterprise software systems are built and evolved at scale, including tradeoffs around reliability, change management, and long-term maintainability

Clear ownership of complex systems that you designed, built, and supported in production

Hands-on ownership of LLM validation loops used to ensure correctness and durability in real environments

Experience designing systems that combine graph, vector, and traditional data models to support reasoning over complex domains

Proven ability to deliver outsized impact through the right features, not just more code

Track record of being a self-learner who requires minimal supervision and gets things done without compromising on quality

Competitive salary and equity

Paid medical, dental, and vision insurance for you and your dependents

4% 401(k) match

Flexible vacation days, sick days, and work-from-home days

Technology (hardware, software, reading materials, etc.) equipment and/or allowance

The opportunity to re-shape an entire industry and create a platform that changes the future of software creation

A beautiful office environment with adjacent offices shared by other startups — an energizing community

Unlimited snacks, fizzy water, coffee, espresso, and whatever else you need to perform at your best

Led by two pioneering co-founders we are one of the fastest growing companies in the U.S., creating our own category of enterprise autonomous software development. We automate thousands of hours of software development for our customers, which includes strong representation within the Fortune 500.

We move Blitzy Fast: Time is both our company's and our clients' most precious asset. We move quickly and decisively to innovate internally and deliver exceptional software externally.

Championship Mindset: We operate like a professional sports team. We win as a team by holding ourselves and each other to high standards, collaborating in-person, and remaining focused on the mission.

Passion for Invention: We're pushing the frontier of what's possible, requiring constant innovation and iteration.

We Work for the Customer: We focus on delivering outsized value to the customers we work with and expanding those relationships into deep, meaningful partnerships.

We believe in being 'everyday athletes'—taking care of ourselves so we can bring our best minds to work. We promote great sleep, movement, and restorative activities for optimal mental performance. It makes for a happier and more productive team.