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We are seeking an experienced Go (Golang) Open-Source Software Engineer to drive the modernization and maintenance of large-scale third-party package ecosystems. The engineer will be responsible for performing version upgrades of open-source Go packages, resolving dependency conflicts, fixing code breaks introduced by package updates, and ensuring successful validation through build, test, and presummit pipelines. The ideal candidate will possess deep expertise in Go modules, dependency management, build systems, CI/CD pipelines, and OSS package maintenance. This role requires hands-on engineering ownership across package migration, compatibility remediation, Copy bara workflows, build/test stabilization, local patch management, and upstream contribution activities. Key Responsibilities: - Open-Source Package Upgrade Management Perform version upgrades of Go open-source packages across large codebases. Analyze package dependencies and transitive dependency chains. Assess compatibility impact of package upgrades on consuming applications. Drive package modernization and retirement of obsolete dependencies. Manage end-to-end package migration activities. Dependency Analysis & Remediation Investigate dependency conflicts and version incompatibilities. Resolve issues arising from indirect and nested dependencies. Analyze API deprecations and breaking changes introduced by package upgrades. Create remediation plans for application and library compatibility issues. Develop dependency migration strategies for large package ecosystems. Go Development & Debugging Troubleshoot and resolve code breaks resulting from package version migrations. Modify Go applications and libraries to align with updated package APIs. Perform root cause analysis of runtime, functional, and integration failures. Develop and maintain fixes for OSS-related defects. Contribute improvements and fixes to upstream open-source projects where appropriate. Build & Test Engineering Diagnose and resolve build failures triggered by package upgrades. Investigate and fix unit, integration, and regression test failures. Ensure successful execution of CI/CD validation pipelines. Resolve failures identified during global pre submit validation processes. Improve build reliability and automation around package migration workflows. Copy bara & Source Synchronization Manage Copy bara configurations and synchronization workflows. Troubleshoot repository synchronization and code migration issues. Resolve merge conflicts and code integration challenges. Support source movement between internal and external repositories. Patch Management Create and maintain local patches for package compatibility. Track upstream fixes and assess opportunities to retire local patches. Manage patch lifecycle and release readiness. Maintain upgrade documentation and remediation records. Engineering Automation Develop automation for: Dependency discovery Version analysis Impact assessment Upgrade validation Failure triage Build tooling to improve migration velocity and engineering productivity. Required Technical Skills: - Go Programming Expertise Strong software engineering experience in Go (Golang). Deep understanding of: Goroutines Channels Concurrency patterns Memory management Context propagation Error handling strategies Experience developing and maintaining production-grade Go applications. Go Ecosystem Knowledge Extensive experience with: Go Modules GOPROXY Dependency resolution Semantic versioning Package publishing Open-source package maintenance Build & CI/CD Strong experience with: Bazel Go Build Go Test GitHub Actions Jenkins Build kite GitLab CI Ability to troubleshoot large-scale build environments. Dependency & Migration Engineering Experience performing: Package upgrades Framework migrations Dependency conflict resolution Version compatibility analysis API migration and refactoring Source Control & Repository Management Git expertise. Experience with monorepos and large-scale codebases. Familiarity with Copy bara or equivalent repository synchronization tools. Code review and branching strategy experience. Platform & Infrastructure Linux systems expertise. Container technologies: Docker Kubernetes Familiarity with cloud-native development practices
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In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.