Golang Developer

Role: Senior Software Engineer – Go (Golang)Term: ContractLocation: Bellevue, WA (hybrid)JOB DESCRIPTION: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.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, Copybara workflows, build/test stabilization, local patch management, and upstream contribution activities.Key ResponsibilitiesOpen Source Package Upgrade ManagementPerform 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 & RemediationInvestigate 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 & DebuggingTroubleshoot 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 EngineeringDiagnose 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 SynchronizationManage 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 ManagementCreate 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 AutomationDevelop automation for:Dependency discoveryVersion analysisImpact assessmentUpgrade validationFailure triageBuild tooling to improve migration velocity and engineering productivity.Required Technical SkillsGo Programming ExpertiseStrong software engineering experience in Go (Golang).Deep understanding of:GoroutinesChannelsConcurrency patternsMemory managementContext propagationError handling strategiesExperience developing and maintaining production-grade Go applications.Go Ecosystem KnowledgeExtensive experience with:Go ModulesGOPROXYDependency resolutionSemantic versioningPackage publishingOpen-source package maintenanceBuild & CI/CDStrong experience with:BazelGo BuildGo TestGitHub ActionsJenkinsBuildkiteGitLab CIAbility to troubleshoot large-scale build environments.Dependency & Migration EngineeringExperience performing:Package upgradesFramework migrationsDependency conflict resolutionVersion compatibility analysisAPI migration and refactoringSource Control & Repository ManagementGit expertise.Experience with monorepos and large-scale codebases.Familiarity with Copybara or equivalent repository synchronization tools.Code review and branching strategy experience.Platform & InfrastructureLinux systems expertise.Container technologies:DockerKubernetesFamiliarity with cloud-native development practices.