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Blitzy is an AI software development platform headquartered in Cambridge, MA, on a mission to revolutionize the software development lifecycle by autonomously building custom software. The company is backed by tier-1 investors and has proven founder pedigree, operating as one of the fastest-growing companies in the U.S. and creating a new category of enterprise autonomous software development.
You will take full, hands-on ownership of Blitzy's most critical production-grade systems and deliver high-leverage features that materially improve customer outcomes and engineering velocity. This is the most senior individual contributor role at the company—not a management track, architecture-only role, or promotion path, but rather a position for someone who has already operated at Principal/Staff+ scope and expects to spend their time writing, reviewing, and shipping production code.
Key responsibilities include:
- 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 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
- Design and evolve data architectures incorporating relational, NoSQL, graph, and vector databases to support complex enterprise applications and semantic retrieval
- Modernize and improve complex enterprise systems while balancing reliability, maintainability, scalability, and delivery speed
- Set and uphold engineering quality standards through hands-on technical leadership, sound technical judgment, and ownership of long-term technical decisions
The company culture emphasizes moving fast, operating with a championship mindset, passion for invention, and deep customer focus. This is a 100% hands-on role where leverage comes from system ownership, execution quality, and durable technical decisions—not people management or process.
REQUIREMENTS:
- 12+ years of 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 (GCP or Azure)
- Advanced knowledge of Kubernetes and Terraform in production environments
- Experience operating highly available production systems, including monitoring, scalability, reliability, performance optimization, and operational tooling
- Strong knowledge of SQL and NoSQL databases (PostgreSQL, MySQL, MongoDB, Cassandra, DynamoDB)
- Familiarity with graph databases (Neo4j) and vector databases or embedding infrastructure for semantic search and retrieval
- Hands-on experience building and operating LLM-powered systems in production, including evaluation, validation, regression testing, tracing, and failure analysis
- Working knowledge of LangSmith or comparable LLM observability and evaluation tools; familiarity with OpenAI, Anthropic, or similar model providers is a plus
- Ability to contribute across the full stack, with strong understanding of frontend architecture and ability to debug, design, and ship across frontend, backend, infrastructure, and AI systems
- Understanding of large-scale enterprise software systems, including architecture, integration, deployment, modernization, and long-term maintainability
- Proven track record of operating at Staff+, Principal Engineer, or comparable scope, independently driving complex technical initiatives and delivering high-impact outcomes with minimal supervision
