Senior Software Engineer (Frontend, Platform & Developer Experience)

TL;DR

Senior Software Engineer (Frontend, Platform & Developer Experience): Designing and maintaining shared UI libraries, build pipelines, design systems, and developer tooling with an accent on improving reliability, performance, and engineering velocity at scale. Focus on shaping how frontend code is written, tested, and shipped company-wide and solving complex developer experience challenges.

Location: This is a hybrid role based in Lisbon, Portugal.

Company

Datadog is a global SaaS business focused on breaking down silos and solving complexity in the cloud age by enabling digital transformation and infrastructure monitoring.

What you will do

• Design and implement core frontend platform components, including shared UI libraries, build systems, and performance tooling.
• Develop and maintain internal developer tools that accelerate engineering workflows and promote consistency.
• Lead architectural decisions for frontend infrastructure with a focus on scalability and developer experience.
• Establish and promote best practices for testing, accessibility, performance, and frontend standards.
• Build CI/CD tooling, local development environments, and automation that support fast and reliable code delivery.
• Mentor engineers and serve as a technical leader for frontend tooling and platform design.

Requirements

• 6+ years of experience building large-scale frontend systems, ideally in platform or developer experience roles.
• Expertise in JavaScript/TypeScript and modern frontend frameworks such as React.
• Deep experience with modern frontend build tools, bundlers (e.g., Rspack, esbuild, Lage), and CI/CD workflows.
• Experience building internal tools, component libraries, or design systems for large engineering organizations.
• Ability to lead cross-team initiatives and influence adoption of platform standards.
• Focus on reliability, performance, and enabling efficient developer workflows via thoughtful developer experience.

Culture & Benefits

• Operates as a hybrid workplace to ensure work-life harmony.
• Generous and competitive benefits package.
• New hire stock equity (RSUs) and employee stock purchase plan.
• Continuous career development and pathing opportunities.
• Friendly and inclusive workplace culture.