Webflow Developer / Front-End Engineer London

SLAMcore; Greater London; On-site; GBP 50,000 - 70,000; Full time

Job summary

SLAMcore is seeking a Webflow Developer / Front-End Engineer in Greater London to create high-performance experiences on the marketing site. Responsibilities include building components in Webflow, implementing JavaScript functionality, and supporting technical SEO systems. A strong background in Webflow, HTML, CSS, and JavaScript is essential, along with knowledge of technical SEO principles. This is a unique opportunity to grow within a fast-paced AI company, offering a blend of front-end engineering and backend tooling.

Qualifications

• Strong experience working with Webflow in a production environment.
• Solid fundamentals in HTML, CSS, and JavaScript.
• Comfortable working outside Webflow when needed (custom JS, embeds, APIs).
• Experience with technical SEO concepts (page speed, structured data, indexing basics).

Responsibilities

• Building and maintaining pages and components in Webflow.
• Implementing custom front-end functionality using JavaScript.
• Supporting technical SEO and automation tools running on AWS.
• Working with Lambda functions, APIs, and backend services as needed.
• Improving performance, accessibility, and technical SEO.

Skills

Webflow experience

HTML fundamentals

CSS fundamentals

JavaScript fundamentals

Technical SEO concepts

Tools

AWS

Node.js

Job description

About the Role

This role sits within our Marketing Website team, responsible for how Synthesia shows up to millions of users globally.

As a Webflow Developer / Front-End Engineer, you’ll work across Webflow, front-end code, and supporting tooling. You’ll collaborate closely with Design, SEO, Growth, and Engineering, and you’ll have real ownership over what ships to production.

Your mission is simple: build fast, reliable, and high-performing experiences on our marketing site, and help maintain the systems that support SEO, experimentation, and growth.

What you’ll be working on

• Building and maintaining pages and components in Webflow (CMS, localization, integrations)
• Implementing custom front-end functionality (JavaScript, animations, interactive widgets, forms, experiments)
• Supporting and extending internal SEO and automation tools (currently running on AWS)
• Working with Lambda functions, APIs, and simple backend services where needed
• Improving performance, accessibility, and technical SEO
• Collaborating closely with Design, SEO, Growth, and Engineering
• Shipping fast, iterating often, and keeping quality high

Skills and requirements

Must-have skills/experience

• Strong experience working with Webflow in a production environment
• Solid fundamentals in HTML, CSS, and JavaScript
• Comfortable working outside Webflow when needed (custom JS, embeds, APIs)
• Experience with technical SEO concepts (page speed, structured data, indexing basics)

Some extra skills that would be awesome

• Experience with AWS (Lambda, basic infrastructure, scripts, cron jobs)
• Familiarity with Node.js or similar backend runtimes
• Experience building or maintaining SEO tooling, scrapers, generators, or automation
Knowledge of analytics and tracking setups (GA4, GTM, events)
• Experience working in a product-led or growth-focused environment

How we work

• Small team, high ownership, and meaningful impact
• Webflow is our main platform — but we regularly extend it with custom code and build custom tooling
• We care deeply about performance, maintainability, and clean implementations
• You’ll have real influence over technical decisions, tooling, and how things are built

This role is not for you if

• You only want to design in Webflow Designer and avoid code
• You’re uncomfortable touching JavaScript or backend logic
• You prefer rigid specs over solving open-ended problems

Why this role is unique

• Production traffic at real scale
• A role that spans Webflow, front-end engineering, and backend tooling
• Ownership over both UI and the systems behind it
• Room to grow inside one of the fastest-growing AI companies