Senior Software Engineer, Developer Experience

Block

. Lead and execute large-scale codebase changes, including framework upgrades, language migrations, and dependency updates, with minimal disruption to product teams .

Posted 11/4/2026full-timeRemote • California • United StatesSenior💰 $185,200 - $326,800 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in leading large-scale codebase changes, including framework upgrades and language migrations, while ensuring minimal disruption to product teams. Proficient in improving developer workflows and build tooling, with a strong focus on mentoring and setting technical direction.

Highest-signal resume keywords

Large-Scale Codebase ManagementFramework UpgradesMigration Strategy LeadershipAgentic Loops UnderstandingBuild Tooling Improvement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Codebase RefactoringApplication FrameworksDependency UpdatesAutomated RefactoringCI/CDTest InfrastructureDeveloper Productivity MetricsContext ManagementVerification TechniquesFailure Handling

Soft Skills

Strong Communication SkillsTeam Trust Building

Tools & Technologies

BazelBuckPantsNxGradleCodemodsAST-Based Tooling

Industry Keywords

Developer Workflow FrictionBuild System PerformanceOpen Source ContributionsEngineering Workflows

Tech Stack

Tools & technologies

GradleOpen Source

About the role

Key responsibilities & impact

Lead and execute large-scale codebase changes, including framework upgrades, language migrations, and dependency updates, with minimal disruption to product teams
Design and evolve agentic loops for AI agents to perform engineering work safely and reliably
Identify and resolve root causes of developer workflow friction, including slow builds, flaky tests, and confusing abstractions
Improve build tooling and CI performance, including work with Bazel or a comparable build system
Build guardrails, tests, and automation that make large automated changes safe to land
Partner with product engineering teams to understand pain points and measure impact
Set technical direction and mentor engineers on migration strategy, tooling, and codebase health

Requirements

What you’ll need

Significant experience, typically 7+ years for Senior, 10+ for Staff, working in large, complex codebases
Deep experience with application or platform frameworks, including upgrading them and managing their evolution over time
Track record of leading migrations or large refactors, from planning through rollout
Comfort navigating unfamiliar code quickly and making sound changes across many teams’ areas
Solid understanding of agentic loops, including tool use, context management, verification, and failure handling
Genuine willingness to keep investing in and evolving agentic loops as the field changes
Strong communication skills and ability to build trust with teams whose code you’re changing
Nice to have: hands-on experience with Bazel or similar build systems, such as Buck, Pants, Nx, or Gradle
Nice to have: experience with codemods, AST-based tooling, or automated refactoring at scale
Nice to have: background in CI/CD, test infrastructure, or developer productivity metrics
Nice to have: experience building or integrating LLM-based coding tools into engineering workflows
Nice to have: open source contributions to build tools, frameworks, or developer tooling

Benefits

Comp & perks

Remote work
Medical insurance
Flexible time off
Retirement savings plans
Modern family planning