Senior Full Stack Engineer - Team Web

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 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, giving modern support teams one single system.

Together with Salesforce, the #1 AI CRM, where humans with agents drive customer success, we're building the future of customer experience. Here, ambition meets action. Tech meets trust. And innovation isn't a buzzword, it's a way of life. The world of work as we know it is changing, and we're looking for Trailblazers who are passionate about bettering business and the world through AI.

Ready to level up your career at the company leading workforce transformation in the agentic era? You're in the right place. Agentforce is the future of AI, and you are the future of Salesforce.

What's the opportunity?

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.

See the teams most recent work here

What will I be doing?

• 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., CircleCI) .
• 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.

What skills do I need?

• 8+ years of experience in full stack development, with expertise in JavaScript, HTML, and CSS.
• 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 CircleCI) to streamline and automate development workflows.
• Familiarity with infrastructure as code tools such as Terraform , and cloud platforms like AWS (Vercel, CloudFront, 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).

LI-Hybrid

Unleash Your Potential

When you join Salesforce, you’ll be limitless in all areas of your life. Our benefits and resources support you to find balance and be your best, and our AI agents accelerate your impact so you can do your best. Together, we’ll bring the power of Agentforce to organizations of all sizes and deliver amazing experiences that customers love.

In the United States, compensation offered will be determined by factors such as location, job level, job-related knowledge, skills, and experience. Certain roles may be eligible for incentive compensation, equity, and benefits. At Fin, we want to give …