Senior Full Stack Engineer - Team Web

Fin is the AI Customer Agent company on a mission to help businesses provide perfect customer experiences.

Our AI Agent Fin is the highest‑performing AI Customer Agent on the market today, enabling businesses to deliver impeccable, always‑on customer support across the customer journey – from service, to sales, to ecommerce. Powered by our own AI models, Fin resolves complex customer issues end‑to‑end across every channel, with minimal set‑up and integration. Fin can also be combined with our natively integrated Intercom help desk for one single system that is designed to meet the needs of modern day support teams.

Founded in 2011, Fin became one of the fastest growing companies and remains one of the largest private software companies in the world with nearly 30,000 global businesses using our products to transform their customer support. Driven by our core values, we push boundaries, build with speed and intensity, and relentlessly deliver incredible value to our customers.

Our company website is the centerpiece of our brand — the public source of truth about Fin's products and the number one driver of leads for our demand generation team. Fin.ai sits at the intersection of awareness, product marketing, demand, and support, requiring robust, performant, and reliable infrastructure as much as polished user‑facing interfaces.

We’re looking for a Senior Full Stack Engineer to join Team Web, who is passionate about crafting intuitive front‑end experiences and building the backend systems and tools that power them. You’ll play a key role in shaping the future of our website across the full stack, from UI to infrastructure, while collaborating with product marketers, designers, and engineers across the business.

• Design, build, and maintain end‑to‑end web solutions — from modern UIs to backend services, APIs, and infrastructure.
• Collaborate with design, brand, marketing, and content teams to deliver seamless, performant experiences across web and mobile.
• Develop backend logic and APIs, manage data flows, and implement systems that integrate with third‑party platforms.
• Optimize website performance by applying best practices in front‑end development, including lazy loading, and efficient asset management.
• Set up and manage infrastructure using tools like Vercel, AWS, Cloudfront, Terraform, and CI/CD pipelines (e.g., Circle
  
  CI).
• Implement and maintain web analytics, and support A/B testing for data‑driven decisions.
• Stay current with emerging technologies and trends to continually improve our development processes and user experience.
• Be comfortable writing backend software. We look for engineers to be able to unblock themselves end to end.
• Build using the best tools in the industry. We invest heavily in AI‑powered developer tools that remove friction and help you focus on solving meaningful problems.

• Expert in front‑end frameworks such as React, Next.js, Tailwind.
• Experience in CMS platforms (such as Contentful and Sanity) and marketing tools (e.g., Google Tag Manager, Marketo).
• Experience in CI/CD tools (such as Circle
  
  CI) to streamline and automate development workflows.
• Familiarity with infrastructure as code tools such as Terraform, and cloud platforms like AWS (Vercel, Cloud Front, S3, etc.).
• Experience with A/B testing and familiarity with analytics tools to drive data‑informed design and development decisions.
• Knowledge of performance optimization techniques and best practices for fast‑loading, responsive websites.
• Experience in writing tests for front‑end components, with familiarity in testing frameworks (e.g., Jest, Mocha, Cypress).
• Strong problem‑solving skills and the ability to work independently and as part of a team.
• Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience).

We are a well treated bunch, with awesome benefits! If there’s something important to you that’s not on this list, talk to us!

• Competitive salary and equity in a fast‑growing startup
• We serve lunch every weekday, plus a variety of snack foods and a fully stocked kitchen
• Pension scheme & match up to 4%
• Peace of mind with life assurance,…