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We are a fast-growing e-commerce business looking for an experienced front-end web developer to work with us on an ongoing contract basis. The role will focus on building custom JavaScript and CSS for A/B testing and conversion rate optimisation (CRO) using [login to view URL], as well as supporting email marketing development. This is a hands-on role suited to someone who understands how clean, efficient front-end code directly impacts conversion, user experience, and revenue. Key Responsibilities Develop custom JavaScript and CSS for A/B and multivariate tests using [login to view URL] Translate CRO briefs, wireframes, and hypotheses into production-ready test code Implement front-end changes such as: Layout and UX experiments CTA, copy, and visual variations Pricing, product, and checkout experiments Ensure all test code is: Performant Cross-browser compatible Mobile-first and responsive Debug and troubleshoot experiments in live environments Support email marketing development, including: HTML/CSS email templates JavaScript enhancements where appropriate Cross-client compatibility testing Collaborate with our internal marketing and CRO team to iterate, test, and optimise continuously Maintain clean, reusable, and well-documented code Required Skills & Experience Strong experience with JavaScript (ES6+) and CSS Proven experience building custom A/B test code for live e-commerce websites Hands-on experience with [login to view URL] (or similar tools such as VWO, Optimizely, AB Tasty) Solid understanding of: DOM manipulation Event handling Performance optimisation Experience working with high-traffic e-commerce environments Strong attention to detail and ability to test thoroughly before deployment Comfortable working independently and managing multiple experiments concurrently Nice to Have Experience with CRO methodology and statistical testing Familiarity with analytics tools (GA4, GTM, etc.) Experience coding for email marketing platforms (e.g. Klaviyo, Mailchimp, Salesforce Marketing Cloud) Understanding of accessibility and UX best practices
Projekt-ID: 40058729
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109 Freelancer bieten im Durchschnitt $37 USD/Stunde für diesen Auftrag

Hi Direct, I’ve developed multiple A/B testing tools and integrated them with platforms like Google Optimize and VWO, so I understand the nuances of creating effective tests. I also have extensive experience with JavaScript and CSS, and I’ve worked with email marketing tools like Mailchimp and Klaviyo. In addition to A/B testing, I can help with broader conversion rate optimization (CRO) strategies. I’ve worked with several startups as a dedicated front-end developer, where I learned to prioritize fast, clean code that directly impacts user experience and conversion rates. Let’s schedule a quick 10-minute call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. Best regards, Adil
$47,34 USD in 40 Tagen
7,2
7,2

Dear Hiring Team, I am an expert in Shopify, WordPress, and various web development technologies, ready to start RIGHT AWAY. I am equipped to take on your e-commerce project, with experience in custom JavaScript, CSS, A/B testing, and CRO. Let's optimize your conversions together! Regards, Pooja
$25 USD in 1 Tag
7,0
7,0

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ===>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam
$43 USD in 40 Tagen
5,9
5,9

Greetings! I’ve reviewed your project and see that you’re looking for —"an experienced front-end web developer to work with you on an ongoing contract basis "—and I’m genuinely excited to bring your vision to life. I’m a software engineer with over five years of experience in full-stack development and also a Web & Mobile App Trainer at Saylani Mass IT Training (International Trust), where I mentor and train aspiring developers. I build clean, responsive, and performance-driven websites and applications that not only look great but also function seamlessly. Let’s connect and create something impactful together! You can also check out my portfolio: freelancer.com/u/afsahfarooqui119 Best regards, Afsah Farooqui
$27 USD in 40 Tagen
5,4
5,4

Greetings, I appreciate the opportunity to apply for this front-end developer role with a focus on A/B testing and conversion rate optimization. It looks like you're in need of someone who can effectively create custom JavaScript and CSS for your e-commerce site, ensuring that every detail contributes to a seamless user experience and improved revenue. I can help by translating your CRO briefs into high-quality, efficient code while also supporting your email marketing needs. With strong expertise in JavaScript and CSS, I have successfully built A/B test code for live e-commerce platforms. I prioritize clean, responsive design and thorough testing to ensure optimal performance across devices and browsers. Collaboration with your marketing and CRO team would be key in refining our strategies. What specific goals do you have in mind for your upcoming A/B tests? Best regards,
$53 USD in 7 Tagen
4,8
4,8

Hello Direct, I am Vishal Maharaj, a seasoned front-end developer with 20 years of expertise in JavaScript and HTML. I have carefully reviewed your project requirements and am confident in my ability to deliver exceptional results for your e-commerce business. In approaching this project, I will focus on developing custom JavaScript and CSS for A/B testing and CRO using Convert.com. I will translate CRO briefs into production-ready test code, ensuring performance, cross-browser compatibility, and responsiveness. Additionally, I will support email marketing development by creating HTML/CSS email templates and conducting cross-client compatibility testing. I am keen to discuss how I can contribute to your team and help drive conversion, user experience, and revenue. Please initiate a chat to further explore this opportunity. Cheers, Vishal Maharaj
$60 USD in 40 Tagen
5,6
5,6

✨ Let's make your front-end web development seamless and stress-free. Hello directsight, I see you need custom JavaScript and CSS for A/B testing and CRO to impact conversions and revenue directly. I understand how crucial it is to have performant and cross-browser compatible code without compromising user experience. I've built similar solutions for e-commerce businesses, with 5 years of hands-on experience in front-end development. I'll deliver production-ready test code for layout and UX experiments, CTA variations, and more — fully performant and responsive. Successfully delivered 10+ similar projects with 5-star ratings. Available to start immediately — first milestone ready in 2 weeks. I'd love to discuss your vision. When works best for a quick 10-minute call? Worst case, you'll get free insights to guide your project. Looking forward to collaborating, Piyush Gupta Front-End Developer | 5+ Years
$50 USD in 2 Tagen
4,3
4,3

With my nuanced skillset as a full-stack developer, comprising over 8 years of experience working on high-end conversion-focused projects, I bring a unique perspective to the e-commerce landscape. Not only am I proficient in JavaScript and CSS, but I also possess an extensive understanding of front-end design and its impact on user experience and conversion. This expertise aligns impeccably with your need for A/B testing and CRO with Convert.com. Throughout my career, I have regularly built custom A/B test code for live e-commerce websites. This hands-on experience, coupled with my meticulousness, ensures that all test codes are performant, cross-browser compatible, mobile-first and responsive - crucial for successful CRO. Moreover, I can adeptly navigate high-traffic e-commerce environments while delivering clean, reusable code consistently. Finally, I'm well-versed in working collaboratively with cross-functional teams and utilizing analytics tools like GA4 and GTM effectively to validate and iterate my work. Your project would benefit greatly from my strong problem-solving skills and the capacity to manage multiple experiments concurrently. Together we can create an enhanced user experience that maximizes your business's revenue.
$30 USD in 40 Tagen
4,1
4,1

Hello Direct S. Hope you are doing well! This is Efan , I checked your project detail carefully. I am pretty much experienced with A/B Testing, Mailchimp, Klaviyo, Analytics, Website Design, Email Marketing, HTML, Debugging, JavaScript and CSS for over 8 years, I can update you shortly. Cheers Efan
$50 USD in 30 Tagen
4,6
4,6

Hey Direct S., How are you! I've carefully checked your requirements and really interested in this job. I'm a full stack Javascript developer working at large-scale apps as a lead developer with U.S. and European teams. I'm offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I'm well versed in React/Redux, Angular JS, VueJS, Node JS, Python, html/css as well as javascript and jquery. Simply, I have rich experienced in JavaScript, Website Design, CSS, HTML, Debugging, Analytics, Email Marketing, Mailchimp, A/B Testing, Klaviyo as you enumrated. For more information about me, please refer to my portfolios. I'm ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details. Best Regards, Dragan M.
$25 USD in 90 Tagen
2,0
2,0

Hello Direct, I am excited about the opportunity to collaborate on your project 'Front-End Developer (A/B Testing & CRO)'. With over ten years of solid experience in web and mobile app development, I am well-positioned to bring your vision to fruition. My focus is on understanding your unique requirements and delivering tailored solutions that drive tangible results. Clear and consistent communication is paramount to our success. I am committed to keeping you informed and involved throughout the project journey, ensuring we achieve our goals together. Let's talk to you about how I can contribute to your project's success.
$43 USD in 40 Tagen
1,4
1,4

Hi Direct S., I am an expert web computer programmer with skills including Mailchimp, HTML, Website Design, Debugging, JavaScript, Klaviyo, Analytics, A/B Testing, Email Marketing and CSS. Please contact me to discuss more regarding this project. Thank you for your attention
$70 USD in 21 Tagen
1,0
1,0

Hey Direct S., I just finished reading the job description and I see you are looking for someone experienced in Email Marketing, JavaScript, CSS, Mailchimp, Debugging, Klaviyo, A/B Testing, Website Design, HTML and Analytics. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Haseeb.
$25 USD in 24 Tagen
1,8
1,8

Hello, Greetings Direct S., Good morning! I am an expert mobile engineer with skills including HTML, JavaScript, CSS, Klaviyo, Debugging, Analytics, Mailchimp, A/B Testing, Website Design and Email Marketing. Please contact me to discuss more regarding this project. I await your immediate response
$50 USD in 30 Tagen
0,0
0,0

Hi Direct S., Good morning! I am an expert mobile engineer with skills including Email Marketing, Website Design, Mailchimp, Analytics, HTML, JavaScript, A/B Testing, CSS, Debugging and Klaviyo. Please send a message to discuss more about this project. Thanks and Regards
$50 USD in 19 Tagen
0,0
0,0

Hello,? I build rock-solid APIs that keep your systems connected ? Having successfully built, optimized, and maintained numerous high-performance WordPress websites, I believe I am the right fit for your project. My proficiency in HTML, CSS, JavaScript aligns perfectly with your requirements for A/B testing using Convert.com. I have an excellent grasp of DOM manipulation, event handling, and performance optimization to ensure that your tests run smoothly in live environments and deliver insightful results. Moreover, my experience working with high-traffic e-commerce environments has instilled in me a strong sense of attention to detail and thoroughness. I prioritize clean, reusable code and emphasize documentation for future reference and easy maintenance. This meticulous approach combined with my comfort in managing multiple experiments concurrently makes me efficient and effective for meeting project goals on time. Being well-versed in other areas such as website design and SEO optimization means I bring holistic expertise to the table. A clean layout and streamlined user experience are vital for driving conversions - something I'm deeply committed to achieving. Finally, offering post-delivery support means our partnership will be long-term-oriented as we work together to continuously iterate, test and optimize for better conversion rates and business growth. Thanks!
$50 USD in 18 Tagen
0,0
0,0

I’m ready to kick off a fresh collaboration—bringing a bold mix of creativity, precision, and skill to achieve your goals with style. Your focus on clean, efficient front-end code for A/B testing and CRO aligns perfectly with my approach to delivering polished, intuitive, and effortless solutions that keep experiences cohesive, connected, and streamlined. I offer strong expertise in JavaScript (ES6+), CSS, and hands-on experience crafting custom test code for live e-commerce sites. While I am new to Freelancer, I bring extensive experience and have successfully completed numerous projects off site. Because I am focused on building my reputation here, I am open to negotiating pricing, provided a review is given upon successful completion. This way, you benefit from professional, high quality work at flexible terms, while I continue establishing credibility on the platform. How do you currently prioritize feature testing to optimize conversion and ensure code performance on mobile? I would love to chat more about your project! Regards, Lionel R
$25 USD in 14 Tagen
0,0
0,0

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