Square One Resources
Senior Optimisation Engineer - CRO
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Job Title: Senior Front End Developer - Optimisation/CRO
Location: London - 2 days per week in the office
Salary/Rate: £650 inside IR35
Start Date: 20/07/26
Company Introduction
We have an exciting opportunity now available with one of our sector-leading telecommunications clients! They are currently looking for a skilled Front End Developer with optimisation experience to join their team for an initial 2-month contract to be extended.
We are looking for an experienced Senior Optimisation Engineer to work in our Optimisation team to help build out the web UI campaigns for our new services and applications.
This is a role for an experienced frontend web application developer to optimise our current UI to achieve OKR’s set by the business and improve our customer usage and enjoyment metrics. You will be a strong front-end coder with experience of working in experimentation, optimisation & personalisation. In this role you will be working with optimisation tools in an Agile squad, ultimately responsible for and further evolving the engineering quality, design, implementation, and operation of your product.
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You will work with business partners, engineers, data scientists, and UX designers to design, implement, test, deliver, and document complex applications, tools, systems and services.
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The must haves:
- Strong experience developing A/B / MVT optimisation campaigns
- Excellent knowledge of Vanilla JavaScript, CSS/Sass, HTML, jQuery
- Front end development experience in either REACT or Angular framework
- Technical expertise in A/B testing platforms like Optimizely, Adobe Target etc.
- A passion for great online experience and an understanding of end-to-end user journeys and customer experience/CX
- Solid experience of website personalisation and audience targeting
- Solid experience of working with fully responsive websites and ability to deliver experiences for desktop and mobile devices
- Solid experience of working with/building experiments for SPAs
- Advanced understanding of Data analytics and Tag management systems (GTM) – integrations and custom event tracking
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