Senior Full-Stack Engineer — AI-Powered Web & Platform

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

Benefits offered by this job

Hybrid work model

Job summary

Fin, now part of Salesforce, is seeking a Senior Full Stack Engineer to join Team Web. You’ll craft intuitive front-end experiences and build the backend systems that power them across the full stack, from UI to infrastructure.

You’ll collaborate with product marketers, designers, and engineers to shape the website’s future. You’ll work on APIs, data flows, and third‑party integrations, optimize performance, and contribute to analytics, A/B testing, and CI/CD.

Qualifications

• 8+ years of experience in full stack development with JS/HTML/CSS.
• Strong front-end with React, Next.js, Tailwind.
• Experience with CMS (Contentful, Sanity) and marketing tools (GTM, Marketo).
• CI/CD with CircleCI; IaC (Terraform); AWS ecosystem; serverless/backend APIs.
• A/B testing, analytics, performance optimization, and testing (Jest/Mocha/Cypress).
• Bachelor’s degree 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 for seamless experiences.
• Develop backend logic, APIs, data flows, and integrations with third-party platforms.
• Optimize performance and manage infrastructure (Vercel, AWS, CloudFront, Terraform).
• Implement analytics, support A/B testing, and stay current with new tech.

Skills

Full stack development

JavaScript

HTML

CSS

React

Next.js

Tailwind

Contentful

Sanity

Google Tag Manager

Marketo

CircleCI

Terraform

AWS

Vercel

CloudFront

S3

Jest

Mocha

Cypress

Education

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

Tools

CircleCI

Terraform

AWS

Contentful

Sanity

Vercel

CloudFront

S3

Jest

Mocha

Cypress

Job description

Fin, now part of Salesforce, is seeking a Senior Full Stack Engineer to join Team Web. You’ll craft intuitive front-end experiences and build the backend systems that power them across the full stack, from UI to infrastructure.

You’ll collaborate with product marketers, designers, and engineers to shape the website’s future. You’ll work on APIs, data flows, and third‑party integrations, optimize performance, and contribute to analytics, A/B testing, and CI/CD.