Staff Build Engineer, SandboxAQ

• As our engineering team scales, waiting for builds is not an option. We are looking for an expert who treats the Build System and CI as a Product
• In this role, you will own the end-to-end delivery pipeline, migrating our services to a hermetic Bazel monorepo backed by a massive, Kubernetes-native remote execution cluster (e.g., BuildBarn/EngFlow)
• We are looking for a systems engineer who can dig into the details of build issues and the high-level design of distributed systems. If you are passionate about eliminating "it works on my machine" forever, this role is for you
• 5+ years of Software Engineering experience with a focus on Developer Infrastructure, Build Engineering, or SRE
• Deep expertise in Bazel. You can write custom Starlark rules/macros, debug toolchain hermeticity issues, and explain the difference between input pruning and output caching
• Systems Programming Proficiency (Go/Kotlin/Python). You can write high-performance CLI tools, indexers, or sidecars to augment the build experience
• Experience with Remote Execution. You have operated RBE systems (BuildBarn, EngFlow, or RBE) at scale and understand the underlying gRPC protocols
• Kubernetes Fluency. You understand how to schedule ephemeral build workloads on K8s and have experience with auto-scaling based on queue depth

Desirable

• The Cybersecurity Group at SandboxAQ is looking for a Staff Build Infrastructure Engineer to build the engineering platform for AQtive Guard, our groundbreaking Cryptographic Posture Management and AI Security Posture Management products
• As we deploy globally with major organizations like top-tier financial institutions and government agencies, the speed, quality, and security of our software delivery are critical to our success
• You will engineer a distributed compilation platform that makes builds instantaneous and reproducible. You will write the Starlark rules, the control planes, and the Kubernetes operators that allow hundreds of engineers to ship code safely and rapidly
• Architect the Build Plane: Lead the design and implementation of a high-performance, hermetic build system using Bazel. You will optimize the graph for massive concurrency and incremental correctness
• Scale Remote Execution: Design, deploy, and tune a Remote Build Execution (RBE) cluster (e.g., BuildBarn) running on Kubernetes. You will manage the distributed cache and worker pools to handle spikes in compilation demand across thousands of cores
• Engineer Developer Tooling: Write custom CLI tools and IDE plugins that abstract the complexity of the build system. You will create the "Golden Path" that allows product engineers to spin up hermetic test environments with a single command
• Modernize CI/CD: Move beyond brittle shell scripts. You will treat pipelines as software, using GitOps (ArgoCD) to orchestrate testing workflows that are dynamic, testable, and versioned
• Optimize the Inner Loop: Obsessively profile and reduce build latency. You will analyze critical paths, debug cache misses, and write custom Bazel rules to ensure that feedback loops remain under seconds, not minutes
• Drive Technical Culture: Mentor the wider engineering team on monorepo best practices, dependency management, and hermeticity. You will set the standard for how code is built, tested, and released