Senior Frontend Developer (Next.js)

We are looking for a Senior Frontend Developer (Next.js) to join our team. This role will focus on owning and evolving a high-performance modern website built with Next.js, 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 Next.js (App Router and/or Pages Router).
• 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

Definity was founded in 2004 with the vision of delivering technology that makes a difference. Today, with six offices across the US and Mexico, we’re proud to partner with world-class organizations like Tesla, Harvard, Berkeley, and Flowserve.

We believe diverse perspectives make stronger teams. That’s why inclusion is part of our DNA. We welcome all individuals regardless of gender, orientation, religion, or origin and provide an environment where talent and passion are what matter most.

Join Definity and help shape technology that grows with businesses, people, and communities.