Web Developer - 12 Month Fixed Term Contract

Box Box · Enterprise · Poland · Remote · Marketing

Box is seeking a Web Developer for a 12-month fixed-term contract to support front-end experimentation and optimization. The role involves coding and implementing A/B tests, ensuring high-performance UIs, and collaborating with CRO, web, and marketing teams. Responsibilities include A/B test development, implementation of winning variations, QA, user-centered design using tools like Figma, and collaboration for data analysis.

What you'd actually do

  1. Create, code, and deploy variations for A/B, multivariate, and split-URL tests.
  2. Implement winning test variations into the live product code, ensuring clean, optimized HTML, CSS, and JavaScript, including CSS preprocessors (Less/Sass).
  3. Perform rigorous Quality Assurance (QA) on experiments across devices and browsers before launch to verify functionality and data accuracy.
  4. Create wireframes, prototypes, and high-fidelity mockups for new design iterations using tools like Figma, Sketch, or Adobe XD.
  5. Work closely with CRO team, web team and marketing teams to analyze test results and translate data into actionable insights.

Skills

Required

  • Proficiency in HTML5, CSS3, and JavaScript
  • Experience with Optimizely, VWO, Adobe Target, or similar A/B testing platforms
  • Strong portfolio demonstrating UI design, user journey mapping, and wireframing
  • 2+ years of experience in front-end development, with a specific focus on UI/UX development or conversion rate optimization (CRO)
  • Familiarity with key performance indicators (KPIs) like conversion rate, bounce rate, and click-through rate
  • Experience with server-side testing methodologies

Nice to have

  • Drupal experience
  • React/Nextjs