Senior DevEx Engineer

Responsibilities

• Maintain and evolve our codebase structure — a complex TypeScript monorepo, Go services, npm packages, and internal Agentic tooling.
• Own the build and test pipelines and optimize them to minimize build times and improve developer iteration speed.
• Drive code generation and type-safe interfaces across service boundaries (e.g., GraphQL, Protocol Buffers, gRPC, OpenAPI).
• Set the standards for code quality using automation tools such as TypeScript, ESLint, Prettier, and Go linters/formatters — building custom rules and plugins to enforce Replit-specific requirements.
• Streamline development setup and the onboarding experience.
• Work with platform teams to improve deployment processes, infrastructure integrations, and external tooling.
• Keep things fresh and modern in our codebase by adopting and leading migrations to better and faster tools.
• Partner with the AI team on our internal AI platform (which generates >60% of all merged PRs at Replit) to improve the Agent's output and shape strategy around its default stack.
• Help manage dependencies both internal (public and private) and external, including being the face of the company when interfacing with open-source libraries (e.g., sponsorships, upstream contributions).

Requirements

• Experienced software engineer (senior through staff) with a track record of improving developer productivity at scale.
• Strong proficiency in TypeScript and/or Go and/or Nix.
• Expertise in modern build systems and toolchains (e.g., Vite, webpack, esbuild, Go's build/module system).
• Proficiency with linters, formatters, testing frameworks, and code generation tools.
• Experience managing monorepos or large-scale codebases.

Nice to Haves

• Experience building self-service developer platforms (CI/CD, infra, or tooling) used by many engineering teams.
• Experience with AI-native development workflows — e.g., OpenCode, Claude Code, Cursor, custom agent skills.
• Open-source leadership or community contributions.
• Prior tech lead experience.