Senior Frontend Developer
Definity FirstUnited States
Posted December 24, 2025
Full Time
About the Company
Definity was founded in 2004 with the vision of delivering technology that makes a difference.
Job Description
We are looking for a Senior Frontend Developer to join our team. This role will focus on owning and evolving a high-performance modern website built with Javascript/Typescript/Astro, ensuring strong performance, reliability, and maintainability, deployed on Vercel.
Requirements
- Experience building modern web applications and production websites with Javascript/Typescript/Astro
- Strong proficiency with React and modern JavaScript/TypeScript.
- Experience owning the deployment lifecycle on Vercel (deployments, previews, environment management).
- Solid understanding of modern technical SEO fundamentals (not keyword strategy), including: SSR and SSG, metadata management, Core Web Vitals, sitemap generation and robots configuration, page speed optimization and performance monitoring.
- Accessibility basics (semantic HTML, performance-friendly components).
- Comfort integrating with third-party systems and APIs.
- Secure handling of API keys, webhooks, and environment variables.
- Familiarity with Git and modern version control workflows.
- CI/CD concepts.
- Advanced English.
Benefits
- Opportunity to take end-to-end ownership of a production-grade web platform
- Collaboration with product, marketing, and operations teams
- Chance to continuously improve build, deploy, and development workflows
