Senior Full-Stack Engineer - AI-Driven Web & Infra

intercom; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

Fin, now part of Salesforce, is on a mission to help businesses provide perfect customer experiences. As a Senior Full Stack Engineer in Team Web, you’ll craft intuitive front-end experiences and build backend systems that power them, collaborating with product marketers, designers, and engineers across the business.

You’ll work across UI, APIs, and infrastructure, leveraging modern frameworks and cloud tooling to deliver fast, scalable web experiences while staying current with new technologies.

Qualifications

• 8+ years in full-stack development with JavaScript, HTML, and CSS.
• Proficiency with React, Next.js, and Tailwind for modern UIs.
• Experience with Contentful/Sanity CMS and marketing tools like GTM/Marketo.
• CI/CD experience with CircleCI; IaC with Terraform; AWS cloud services.
• Familiar with A/B testing, performance optimization, and front-end tests (Jest/Mocha/Cypress).
• Bachelor’s degree in CS/SE or equivalent practical experience.

Responsibilities

• Design, build, and maintain end-to-end web solutions from UI to backend services.
• Collaborate with design, brand, marketing, and content teams to deliver seamless experiences.
• Develop backend logic and APIs; manage data flows and integrations with third parties.
• Optimize performance and implement lazy loading, asset management, and testing.
• Set up infrastructure with Vercel, AWS, CloudFront, Terraform and CI/CD pipelines.

Skills

JavaScript

HTML

CSS

React

Next.js

Tailwind

Contentful

Sanity

Google Tag Manager

Marketo

CircleCI

Terraform

AWS

Vercel

CloudFront

S3

A/B testing

Performance optimization

Jest

Mocha

Cypress

Education

Bachelor’s degree in Computer Science, Software Engineering, or a related field

Tools

CircleCI

Terraform

AWS

Vercel

CloudFront

S3

Contentful

Sanity

Google Tag Manager

Marketo

Jest

Mocha

Cypress

Job description

Fin, now part of Salesforce, is on a mission to help businesses provide perfect customer experiences. As a Senior Full Stack Engineer in Team Web, you’ll craft intuitive front-end experiences and build backend systems that power them, collaborating with product marketers, designers, and engineers across the business.

You’ll work across UI, APIs, and infrastructure, leveraging modern frameworks and cloud tooling to deliver fast, scalable web experiences while staying current with new technologies.