Senior Frontend Developer

Job Title:	Senior Frontend Developer
Job ID:	61303172
Job published:	Wednesday November 4, 2026
Job Type:	Permanent
Employment type:	Full-time
Industry:	IT
Expertise:	Software Development
Salary Type:	annual
Location:	Ireland

Job Description

GemPool Recruitment is partnered with a global, data-driven B2B SaaS organization to hire a Senior Frontend Developer (React / TypeScript).

Joining a newly formed New Products team, you will build modern web applications and help modernize an existing, high-scale analytics platform. The engineering culture emphasizes rigorous automated testing and agentic AI-assisted development (Claude Code / Codex).

What You Will Do:

• Architect and build modern web applications for a new product suite.
• Guide the modernization of a large React SPA, including upgrading React across major versions and converting remaining JavaScript to TypeScript.
• Build data-heavy interfaces featuring configurable reports, drag-and-drop layouts, and virtualized tables.
• Work with real-time streaming data over WebSockets alongside REST APIs using Redux Toolkit and RTK Query.
• Maintain high quality standards targeting comprehensive test coverage using Jest, MSW, Storybook, and Playwright.
• Leverage agentic developer tools (Claude Code / Codex) to accelerate refactoring, framework upgrades, and test generation.

What You Bring:

• 5+ years building production web applications in React, including 3+ years of TypeScript.
• Strong experience with Redux Toolkit, RTK Query, or similar client caching/data-fetching libraries.
• Experience upgrading large React codebases across major versions without halting feature delivery.
• High testing discipline with TDD, Jest, React Testing Library, and Playwright.
• Experience designing performance-tuned, data-dense interfaces and dashboards.
• Hands-on familiarity using agentic coding tools (Claude Code or Codex) within day-to-day engineering workflows.

Nice to Have:

• Storybook and component design-system experience.
• Experience with real-time WebSocket UIs.
• Modern build tooling exposure (e.g., Vite).

If you feel like this role may be suitable please apply via LinkedIn or email sean.whelan@gempool.ie