Principal/ Sr Principal Backend Engineer

AI coding is the largest use case of enterprise AI adoption today, as is evident from the success of Anthropic on Claude Code, Cursor’s $60B exit to SpaceX, and Cognition’s $48B valuation.
The bottleneck now has moved from code generation to security and safety - AI agents write code faster than any team can review it, and over 65% of the lines of code produced by them are insecure. Vulnerabilities are piling up 16x faster than companies can fix them, and adversaries are able to exploit these new vulnerabilities within hours.
AURI by Endor Labs closes that gap. It runs inside the harness where coding agents work, through hooks, skills and MCP, so the controls sit outside the model and every agent action is visible. Underneath is our patented code context graph, which maps code, open source, containers and infrastructure. It shows which vulnerabilities can actually be reached and exploited, then delivers fixes that won’t break the application. Security teams get evidence instead of noise, and developers get fixes instead of tickets.
The companies building AI trust us to secure it - our customers include OpenAI, SpaceX, DoorDash, Dropbox, Atlassian, MongoDB, Snowflake, Robinhood and Peloton to name a few.
Endor Labs is the third company from Founder & CEO Varun Badhwar, who built Prisma Cloud, the platform that helped define cloud security, from $0 to $300M ARR at Palo Alto Networks. We’ve raised $163M from Lightspeed, Coatue, DFJ Growth, Salesforce Ventures and Dell Technologies Capital.
Software runs everything around our lives today - banking, hospitals, airports and power grids. AI now writes more of it every day, and our mission is to make sure the world can trust that software. Come build that future with us.

• You will play a pivotal role in architecting and building the core backend infrastructure for our SaaS products.
• You will lead and contribute to large-scale technical projects, ensuring the scalability, reliability, and performance of our systems.
• Design, architect, and build features end-to-end while working closely with Product Management, and our distributed Engineering team
• Play a significant role in driving innovation, making critical architectural decisions, and leading the implementation of cutting-edge technologies.
• We encourage and support active participation in external technical forums, conferences, and open-source communities, allowing you to contribute to the broader tech community and stay at the forefront of industry trends.
• Mentor and coach team members by sharing your expertise, and promoting best practices within the team to foster a culture of continuous learning and growth.

If you are interested in helping to define and build a product and culture at an early-stage company, and the list below matches your background, we would love to talk to you!

• Bachelor's degree in engineering with at least 18+ years of experience building scalable backends for product/SaaS companies, with a strong track record of leading and delivering complex technical projects.
• Proficiency in Golang is strongly preferred; experience with other modern backend languages, microservices/distributed architecture, and frameworks is a plus.
• Practical experience in designing APIs with one or more frameworks (gRPC [preferred], ReST, GraphQL, Thrift, etc.).
• Excellent problem-solving and debugging skills, and effective communication and leadership abilities are a must.
• Scalable Distributed System Experience - understand micro-services and domain-driven design, load balancing, horizontal/vertical scaling, and stateless architectures.
• Architecture - knowledge of data structures and a keen eye for building architectures that scale and extend easily for longevity. Apply data-driven techniques to evaluate and propose architectural choices. 
• Ability to discuss tradeoffs between architecture’s choice to influence groups to move in the right direction.
• Able to enjoy working in a fast-moving environment with evolving requirements.
• Ability to solve problems creatively and independently when in uncharted or unfamiliar territory.
• Practical experience in troubleshooting distributed systems and ability to solve root causes.

We’re building at the intersection of developer productivity and security — one of the fastest-growing spaces in software. Our dev-loved platform has real ROI, strong momentum, and customers who care about doing things right.

At Endor Labs, we think big, start small, and learn fast. We take ownership, move with purpose, and always start with the customer’s success. We debate with data, make the complex simple, and challenge each other with kindness and candor. We celebrate wins, learn from misses, and have fun along the way — because when our customers win, we all win.

Endor Labs is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. Even if you don't fit every requirement above, we believe in the power of diverse perspectives and experiences, so we encourage all talented individuals to apply—there's no one-size-fits-all here.