Senior Software Engineer – Go (Golang) OSS Package Ecosystem

About the Role

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 presubmit pipelines.

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 presubmit validation processes.
  • Improve build reliability and automation around package migration workflows.
• Copybara & Source Synchronization:
  • Manage Copybara 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, and failure triage.
  • Build tooling to improve migration velocity and engineering productivity.

Requirements

• Go Programming Expertise:
  • Strong software engineering experience in Go (Golang).
  • Deep understanding of goroutines, channels, concurrency patterns, memory management, context propagation, and 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, and open-source package maintenance.
• Build & CI/CD:
  • Strong experience with Bazel, Go Build, Go Test, GitHub Actions, Jenkins, Buildkite, and GitLab CI.
  • Ability to troubleshoot large-scale build environments.
• Dependency & Migration Engineering:
  • Experience performing package upgrades, framework migrations, dependency conflict resolution, version compatibility analysis, and API migration/refactoring.
• Source Control & Repository Management:
  • Git expertise.
  • Experience with monorepos and large-scale codebases.
  • Familiarity with Copybara 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.

Qualifications

• 7+ years of experience in software engineering, with a focus on Go (Golang) and open-source ecosystems.

Preferred Qualifications

• Experience managing large-scale OSS upgrade programs.
• Contributions to public Go open-source projects.
• Experience with supply-chain security and dependency governance.
• Familiarity with vulnerability remediation practices.
• Experience with SBOM generation and management.
• Understanding of modern software release engineering practices.

Skills

Mandatory Skills: Golang

Location: Redmond, WA (Hybrid)