Senior Frontend Developer

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.

It’s a great opportunity to take end-to-end ownership of a production-grade web platform while collaborating with product, marketing, and operations teams when integrations or data flows are involved.

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.

Nice to have

• Experience using AI-assisted development tools to accelerate delivery.
• Familiarity with headless CMS patterns and content pipelines.
• Experience with edge functions or serverless APIs.
• Prior work on marketing or product-led websites with real traffic and conversions.

Main Activities

• Design and build a high-performance website using Next.js.
• Own the frontend architecture and deployment lifecycle on Vercel.
• Implement best practices for performance, accessibility, and discoverability.
• Integrate external systems such as billing, CRM, and content platforms.
• Work independently, making technical decisions with minimal oversight.
• Collaborate with product, marketing, and operations when integrations or data flows are involved.
• Continuously improve build, deploy, and development workflows.
• Ensure secure handling of credentials, webhooks, and environment variables.
• Monitor performance and reliability, improving Core Web Vitals and overall site health.

Education

Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience).

About Us

Founded in Monterrey, Mexico, Definity is a nearshore technology partner specializing in custom digital solutions, AI innovation, and business applications. With over two decades of expertise and a strong focus on client success, Definity empowers organizations worldwide to achieve real business results through modern technology.

Definity is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, pregnancy, veteran status, or disability status.

www.definityfirst.com