Our 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.
Apply today for consideration!
Job Title: Golang Developer
Location: Bellevue, WA (Day 1 Onsite – Hybrid, 3 days onsite per week)
Duration: 5 months
Employment Type: W2 Contract
Pay Range: $47-52 per hour
Start Date: TBD — Candidates must be available to start within 1–2 weeks
Job Description
We 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 Responsibilities
Golang Development & Package Upgrades
Assess assigned packages, dependency trees, API changes, build impact, and upgrade complexity
Upgrade Go modules and package versions while managing version changes and local patches
Reapply, update, or safely retire local patches as required
Resolve breaking API changes introduced by upgraded libraries
Update downstream callers directly affected by package upgrades
Analyze complex dependency relationships and package compatibility issues
Build & Test Troubleshooting
Diagnose and remediate Go and Bazel build failures
Troubleshoot existing test failures related to package upgrades
Investigate compiler, linker, build, test, and runtime failures
Troubleshoot applicable CI and presubmit failures
Validate that upgraded packages successfully build and existing tests pass
Isolate issues introduced by dependency or version changes
Engineering Tools & Automation
Maintain and troubleshoot Copybara configurations and source synchronization issues
Use approved internal tools and reusable automation to accelerate dependency analysis and failure triage
Develop repeatable approaches for investigation, validation, and evidence collection
Support efficient engineering workflows for large-scale package migration activities
Change Management & Documentation
Submit review-ready change lists with clear technical rationale and validation evidence
Document package versions, dependency remediation, validation results, and patch status
Maintain traceable migration records throughout the upgrade process
Document and escalate material package deviations and external blockers
Identify cross-product dependency impacts and communicate them to appropriate stakeholders
Collaboration & Delivery
Partner with reviewers, engineering teams, and language subject-matter experts
Communicate technical issues and blockers clearly and proactively
Provide actionable evidence when escalating complex issues
Maintain predictable progress against assigned upgrade priorities
Ensure clean handoffs and capture reusable technical learnings
Qualifications
7+ years of software engineering experience
Strong hands-on Golang / Go development and debugging experience
Strong understanding of Go modules and semantic versioning
Experience with transitive dependency resolution and package compatibility
Strong knowledge of idiomatic Go and API refactoring
Hands-on experience with Go build and Go test
Experience with Bazel and large-scale or monorepo-based build environments
Proven ability to troubleshoot compiler, linker, build, test, and runtime failures
Experience with Git-based development, code reviews, and change management
Experience resolving merge conflicts and managing local patches
Strong Linux and scripting skills
Strong analytical and problem-solving abilities
Excellent written and verbal communication skills
Strong documentation and collaboration skills
Ability to work independently in a complex engineering environment
Must-Have Skills
Golang / Go — Mandatory
7+ years of software engineering experience
Go modules and dependency management
Go build / Go test
Bazel
Git
Linux
Troubleshooting large-scale build and test environments
API compatibility and dependency remediation
Nice to Have
Copybara or comparable source-synchronization tooling
Large-scale open-source dependency upgrade experience
Vulnerability remediation or package maintenance programs
Experience with complex dependency graphs
Generated code and multi-target changes
High-impact API migrations
Building reusable upgrade playbooks or engineering automation
Experience working within large enterprise monorepos
CI/presubmit infrastructure experience
Additional Information
Golang is the highest-priority skill for this position
Candidates should be able to start within 1–2 weeks
Relocation candidates are welcome, but must provide confirmation of their ability to work onsite
Day 1 onsite in Bellevue, WA
Hybrid schedule with 3 days onsite per week
Two rounds of technical interviews
No additional client interview
Hands-on engineering role; candidates should demonstrate recent practical Go development experience
Target profile: 7–12 years of experience
Strong 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
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