Senior Developer Experience Engineer - Remote & Flexible PTO

Block; Los Angeles (CA); Remote; USD 218,000 - 327,000; Full time

Benefits offered by this job

Remote work options

Medical insurance

Retirement plan

Flexible time off

Job summary

Block is seeking a Developer Experience Engineer to optimize our monorepos, lead large-scale codebase updates, and build robust tooling for safer AI-driven engineering work. You will mentor teams, shape migration strategies, and improve build/test infrastructure across multiple domains.

You will drive framework upgrades, language migrations, and dependency updates, ensuring minimal disruption to product teams while maintaining high-quality code health and developer productivity.

Qualifications

• 7+ years in large, complex codebases.
• Experience upgrading frameworks and managing their evolution.
• Led migrations or large refactors from planning to rollout.
• Ability to navigate unfamiliar code quickly and influence multiple teams.

Responsibilities

• Lead and execute large-scale changes across the codebase, including framework upgrades, language migrations, and dependency updates, with minimal disruption to product teams
• Design and evolve agentic loops: the plan, act, verify, and iterate cycles that let AI agents do real engineering work safely and reliably
• Identify friction in the developer workflow (slow builds, flaky tests, confusing abstractions) and fix the root causes
• Improve build tooling and CI performance, including work with Bazel or a comparable build system
• Build the guardrails, tests, and automation that make large, automated changes safe to land
• Partner with product engineering teams to understand their pain points and measure the impact of your work
• Set technical direction and mentor other engineers on migration strategy, tooling, and codebase health

Skills

Large codebases

Framework upgrades

Code migrations

Code exploration

Agentic loops

Communication skills

Tools

Bazel

Buck

Pants

Nx

Gradle

Codemods tooling

CI/CD tooling

LLM tools

Job description

Block is seeking a Developer Experience Engineer to optimize our monorepos, lead large-scale codebase updates, and build robust tooling for safer AI-driven engineering work. You will mentor teams, shape migration strategies, and improve build/test infrastructure across multiple domains.

You will drive framework upgrades, language migrations, and dependency updates, ensuring minimal disruption to product teams while maintaining high-quality code health and developer productivity.