Senior Full-Stack Engineer — Team Web (Hybrid, Equity)

Fin. The highest performing Customer Agent; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Competitive salary and equity

Lunch provided and snack-rich office

Pension scheme & match

Health and dental insurance

Paid time off

Cycle-to-Work

MacBooks provided

Job summary

Fin is seeking a Senior Full Stack Engineer to join Team Web, crafting intuitive front-end experiences and scalable backend systems. You’ll collaborate with product marketers, designers, and engineers across the business to shape the future of our website, from UI to infrastructure, across web and mobile.

Ideal candidates have 8+ years in full stack development, expert JS/React, and experience with CI/CD, cloud infra, and analytics. This is a hybrid role in the United Kingdom.

Qualifications

• 8+ years of experience in full stack development with JavaScript, HTML, and CSS.
• Expert in front-end frameworks (React, Next.js, Tailwind).
• Experience with CMS platforms (Contentful, Sanity) and marketing tools (Google Tag Manager, Marketo).
• Experience in CI/CD tools (CircleCI) to streamline development workflows.
• Familiarity with infrastructure as code tools (Terraform) and AWS.
• Experience with A/B testing and analytics.
• Knowledge of performance optimization for fast-loading websites.
• Experience in writing tests for front-end components (Jest, Mocha, Cypress).
• Bachelor’s degree in CS/SE or related field or equivalent practical experience.

Responsibilities

• 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 integrate with third-party platforms.
• Optimize website performance and asset management.
• Set up and manage infrastructure using Vercel, AWS, CloudFront, Terraform, and CI/CD pipelines (e.g., CircleCI).
• Implement and maintain web analytics, and support A/B testing for data-driven decisions.
• Stay current with emerging technologies and trends to improve development processes and UX.
• Be comfortable writing backend software end to end.
• Build using AI-powered developer tools to remove friction and solve meaningful problems.

Skills

JavaScript

React

Next.js

Tailwind

CMS Contentful

Google Tag Manager

Marketo

CircleCI

Terraform

AWS

A/B testing

Testing: Jest

Testing: Mocha

Testing: Cypress

CI/CD

Education

Bachelor's degree in Computer Science/Software Engineering or related field

Tools

Vercel

CloudFront

S3

Terraform

CircleCI

Job description

Fin is seeking a Senior Full Stack Engineer to join Team Web, crafting intuitive front-end experiences and scalable backend systems. You’ll collaborate with product marketers, designers, and engineers across the business to shape the future of our website, from UI to infrastructure, across web and mobile.

Ideal candidates have 8+ years in full stack development, expert JS/React, and experience with CI/CD, cloud infra, and analytics. This is a hybrid role in the United Kingdom.