About the job
Lexsi Labs is one of the leading frontier labs focused on building aligned, interpretable, and safe Superintelligence. Our work spans efficient alignment methods, interpretability-led system design, and scalable AI platforms that operate reliably across enterprise and regulated environments. As a Senior Infrastructure Software Engineer, you will architect, build, and operate the core backend and deployment systems that power the Lexsi AI platform. You will own multi-cloud, serverless, and stateless AI deployments, ensuring our systems scale seamlessly across environments of any size while maintaining correctness, reliability, and cost efficiency. Responsibilities • Design and build Python-based backend services that power core platform functionality and AI workflows. • Architect and operate AI/LLM inference and serving infrastructure at production scale. • Build stateless, serverless, and horizontally scalable systems that can run across environments of varying sizes. • Design multi-cloud infrastructure across AWS, Azure, and GCP with portability and reliability as first-class goals. • Deploy and manage containerized workloads using Docker, Kubernetes, ECS, or equivalent systems. • Build and operate distributed compute systems for AI workloads, including inference-heavy and RL-style execution patterns. • Implement Infrastructure as Code using Terraform, CloudFormation, Pulumi, or similar tools. • Own CI/CD pipelines for backend services, infrastructure, and AI workloads. • Optimize GPU and compute usage for performance, cost, batching, and autoscaling. • Define and enforce reliability standards targeting 99%+ uptime across critical services. • Build observability systems for latency, throughput, failures, and resource utilization. • Implement security best practices across IAM, networking, secrets, and encryption. • Support compliance requirements (SOC 2, ISO, HIPAA) through system design and evidence-ready infrastructure. • Lead incident response, root cause analysis, and long-term reliability improvements. • Collaborate closely with ML engineers, product, and leadership to translate AI requirements into infrastructure design.
About the company
Lexsi Labs is one of the leading frontier labs focused on building aligned, interpretable, and safe Superintelligence. Our work spans efficient alignment methods, interpretability-led system design, and scalable AI platforms that operate reliably across enterprise and regulated environments.
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