Senior Engineer, Backend

About Linero Linero is building the operational infrastructure that ensures the world's most sensitive technologies reach the right hands, and never the wrong ones. Our customers include some of the most consequential companies in the world: leading AI labs, aerospace and defense primes, semiconductor giants, quantum computing pioneers, and companies pushing the frontier in chemicals, advanced manufacturing, and robotics. We are an AI-native, venture-backed company creating a new category of software at the intersection of national security, industrial infrastructure, and enterprise AI. The Role As a Senior Engineer, Backend, you will own significant pieces of the core infrastructure: designing and shipping systems that power deep enterprise integrations, complex data workflows, and a product that operates under the most stringent security requirements in the industry. This is a high-ownership role. You will drive significant architectural decisions, influence platform choices that will shape how Linero scales, and work closely with the founding engineering team to shape the architecture and trajectory of the product. What You'll Own Design, build, and maintain core backend services and APIs that power Linero's platform at scale Contribute to the design and implementation of multi-tenant architecture with strict data isolation requirements Build scalable, high-performance data pipelines that operate reliably under demanding latency and volume requirements Collaborate closely with AI/ML, infrastructure, and frontend teams to ship cohesive, production-grade product Establish backend engineering standards: code quality, testing practices, and deployment patterns that the team can build on Participate in code reviews, architectural discussions, and the continuous raising of engineering standards across the team What we're looking for 5+ years of backend engineering experience with a proven track record of designing and shipping complex, high-scale systems Demonstrated experience with software architecture; you have designed systems, not just built to spec, and you can articulate the trade-offs behind your decisions Deep proficiency in at least one backend language: Python, Go, or Java preferred Strong experience with API design, distributed systems, and data modeling, including multi-tenant SaaS architectures with strict data isolation requirements Experience building enterprise integrations across heterogeneous systems - ERPs, SaaS platforms, or internal tooling - with fluency in enterprise integration patterns Familiarity with zero-trust security models and experience operating in high-security or regulated environments You take ownership seriously; you don't wait to be told what needs fixing Based in or willing to relocate to New York City What we offer Competitive compensation commensurate with experience Meaningful equity in a company at an early and critical stage of growth Comprehensive benefits including health, dental, and vision The opportunity to shape the core architecture of one of the most consequential platforms being built today Direct access to leadership and genuine influence over how Linero is built Equal Opportunity & Eligibility Linero is an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. This role requires access to export-controlled information, as a result, applicants must be U.S. persons (citizens, lawful permanent residents, refugees, or asylees) as defined under applicable U.S. law. Start date is immediate, with flexibility for the right candidate. If you are not based in New York, we can accommodate remote work for an initial period and offer relocation assistance on a case-by-case basis.