Senior Frontend Developer (React)

TL;DR

Senior Frontend Developer (React): Maintaining and enhancing existing React/TypeScript UIs and building new features, with an accent on stability, code quality, and collaboration with cross-functional teams. Focus on proactively refactoring fragile parts of the codebase, resolving critical bugs, and mentoring teammates to maintain high standards.

Location: Onsite in Valencia, Spain. Relocation package to Spain is offered, including tickets and a 2-week hotel stay, with official employment under Spanish/EU laws.

Company

hirify.global is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing.

What you will do

• Maintain and enhance existing React/TypeScript UIs, emphasizing stability and performance.
• Build new features on top of an established system, adhering to defined architecture and design patterns.
• Drive stability efforts by resolving critical bugs and proactively refactoring fragile parts of the codebase.
• Collaborate closely with Product, Design, and Backend teams to deliver frontend features on schedule.
• Actively participate in code reviews and mentor teammates.
• Help maintain high standards for code hygiene, CI quality, and technical documentation.

Requirements

• 5+ years of professional front-end development.
• 3+ years using React (16.8+) in production environments.
• Strong proficiency in TypeScript, including strict-mode.
• Hands-on experience writing unit tests (Jest) and E2E tests (Cypress or Playwright).
• Experience with TanStack Query (or similar) for REST/GraphQL data-fetching.
• Experience with React Hook Form (or equivalent) and schema-based validation for complex forms.
• Knowledge of modern state management patterns using Zustand, Redux, or equivalent.
• Familiarity with modern build tooling like Vite (preferred) or Webpack 5.
• English: B2 (Intermediate) required.

Nice to have

• Proven ability to refactor large front-end codebases—optimising data-fetch patterns, state management, and component architecture.
• Deep familiarity with modern data-grid libraries, preferably TanStack React Table 8.
• Experience building UIs with Chakra UI or equivalent component libraries with custom theming.
• Familiarity with Storybook.
• Experience designing and implementing infrastructure for AI agent systems.

Culture & Benefits

• Official employment following the laws of Spain/EU, with registration for family members.
• Learning and development opportunities with interesting and challenging tasks.
• Company fitness corner in the office for employees.
• Opportunity to develop language skills and partial compensation for language classes.
• Birthday celebration present.
• 23 working days of Annual Vacation.
• Partially paid breakfasts and lunches in the office.