Golang developer

Senior Golang DeveloperOur client is seeking a senior Golang developer to support a large-scale engineering environment focused on open-source package upgrades, dependency remediation, and build/test stabilization. This role is ideal for a hands-on engineer with strong Go/Golang development experience, expertise in dependency management, and experience working in complex monorepo or enterprise build environments.Job Title: Golang DeveloperLocation: Bellevue, WA (Day 1 Onsite – Hybrid, 3 days onsite per week)Duration: 5 monthsEmployment Type: W2 ContractPay Range: $47-52 per hourStart Date: TBD — Candidates must be available to start within 1–2 weeksJob DescriptionWe are seeking a senior Go engineer to support complex third-party open-source package upgrades within a large monorepo environment. You will own the engineering process from package assessment and version changes through dependency remediation, build and test stabilization, validation, and change submission.This is a highly hands-on engineering role focused primarily on upgrading existing packages and ensuring the existing test suites and applicable presubmits continue to pass. Creation of new unit or integration test suites is not required.Key ResponsibilitiesGolang Development & Package UpgradesAssess assigned packages, dependency trees, API changes, build impact, and upgrade complexityUpgrade Go modules and package versions while managing version changes and local patchesReapply, update, or safely retire local patches as requiredResolve breaking API changes introduced by upgraded librariesUpdate downstream callers directly affected by package upgradesAnalyze complex dependency relationships and package compatibility issuesBuild & Test TroubleshootingDiagnose and remediate Go and Bazel build failuresTroubleshoot existing test failures related to package upgradesInvestigate compiler, linker, build, test, and runtime failuresTroubleshoot applicable CI and presubmit failuresValidate that upgraded packages successfully build and existing tests passIsolate issues introduced by dependency or version changesEngineering Tools & AutomationMaintain and troubleshoot Copybara configurations and source synchronization issuesUse approved internal tools and reusable automation to accelerate dependency analysis and failure triageDevelop repeatable approaches for investigation, validation, and evidence collectionSupport efficient engineering workflows for large-scale package migration activitiesChange Management & DocumentationSubmit review-ready change lists with clear technical rationale and validation evidenceDocument package versions, dependency remediation, validation results, and patch statusMaintain traceable migration records throughout the upgrade processDocument and escalate material package deviations and external blockersIdentify cross-product dependency impacts and communicate them to appropriate stakeholdersCollaboration & DeliveryPartner with reviewers, engineering teams, and language subject-matter expertsCommunicate technical issues and blockers clearly and proactivelyProvide actionable evidence when escalating complex issuesMaintain predictable progress against assigned upgrade prioritiesEnsure clean handoffs and capture reusable technical learningsQualifications7+ years of software engineering experienceStrong hands-on Golang/Go development and debugging experienceStrong understanding of Go modules and semantic versioningExperience with transitive dependency resolution and package compatibilityStrong knowledge of idiomatic Go and API refactoringHands-on experience with Go build and Go testExperience with Bazel and large-scale or monorepo-based build environmentsProven ability to troubleshoot compiler, linker, build, test, and runtime failuresExperience with Git-based development, code reviews, and change managementExperience resolving merge conflicts and managing local patchesStrong Linux and scripting skillsStrong analytical and problem-solving abilitiesExcellent written and verbal communication skillsStrong documentation and collaboration skillsAbility to work independently in a complex engineering environmentMust-Have SkillsGolang/Go — Mandatory7+ years of software engineering experienceGo modules and dependency managementGo build/Go testBazelGitTroubleshooting large-scale build and test environmentsAPI compatibility and dependency remediationNice to HaveCopybara or comparable source-synchronization toolingLarge-scale open-source dependency upgrade experienceVulnerability remediation or package maintenance programsExperience with complex dependency graphsGenerated code and multi-target changesHigh-impact API migrationsBuilding reusable upgrade playbooks or engineering automationExperience working within large enterprise monoreposCI/presubmit infrastructure experienceAdditional InformationGolang is the highest-priority skill for this positionCandidates should be able to start within 1–2 weeksRelocation candidates are welcome, but must provide confirmation of their ability to work onsiteDay 1 onsite in Bellevue, WAHybrid schedule with 3 days onsite per weekTwo rounds of technical interviewsNo additional client interviewHands-on engineering role; candidates should demonstrate recent practical Go development experienceTarget profile: 7–12 years of experienceStrong preference for candidates authorized to work in the U.S.Fast-moving hiring process with an expected profile-closing window of approximately 15–20 days