What is Box?

Box (NYSE:BOX) is the leader in Intelligent Content Management. Our platform enables organizations to fuel collaboration, manage the entire content lifecycle, secure critical content, and transform business workflows with enterprise AI. We help companies thrive in the new AI-first era of business. Founded in 2005, Box simplifies work for leading global organizations, including JLL, Morgan Stanley, and Nationwide. Box is headquartered in Redwood City, CA, with offices across the United States, Europe, and Asia.

By joining Box, you will have the unique opportunity to continue driving our platform forward. Content powers how we work. It’s the billions of files and information flowing across teams, departments, and key business processes every single day: contracts, invoices, employee records, financials, product specs, marketing assets, and more. Our mission is to bring intelligence to the world of content management and empower our customers to completely transform workflows across their organizations. With the combination of AI and enterprise content, the opportunity has never been greater to transform how the world works together and at Box you will be on the front lines of this massive shift.

Why Box needs you:

We are seeking a Web Developer to support our front-end experimentation and optimization efforts. The ideal candidate blends design skills with strong HTML/CSS/JS expertise to code, run, and implement A/B tests, ensuring seamless, high-performance, and responsive user interfaces. This will be a 1 year fixed term contract, working remotely from our Warsaw office. 

What you'll do:

• A/B Test Development: Create, code, and deploy variations for A/B, multivariate, and split-URL tests.

• Implementation & Coding: Implement winning test variations into the live product code, ensuring clean, optimized HTML, CSS, and JavaScript, including CSS preprocessors (Less/Sass).

• QA & Optimization: Perform rigorous Quality Assurance (QA) on experiments across devices and browsers before launch to verify functionality and data accuracy.

• User-Centered Design: Create wireframes, prototypes, and high-fidelity mockups for new design iterations using tools like Figma, Sketch, or Adobe XD.

• Collaboration: Work closely with CRO team, web team and marketing teams to analyze test results and translate data into actionable insights.

Who you are:

• Technical Expertise: Proficiency in HTML5, CSS3, and JavaScript, experience with Drupal is a plus

• A/B Tool Proficiency: Hands-on experience with platforms such as Optimizely, VWO, Adobe Target, or similar.

• Design Skills: Strong portfolio demonstrating UI design, user journey mapping, and wireframing.

• Experience: 2+ years of experience in front-end development, with a specific focus on UI/UX development or conversion rate optimization (CRO).

• Understanding of Metrics: Familiarity with key performance indicators (KPIs) like conversion rate, bounce rate, and click-through rate.

• Experience with server-side testing methodologies.

• Experience in e-commerce or B2B SaaS industry.

• React/Nextjs - nice-to-have skill

Tech Stack

• CMS: Drupal 10

• Repository: Github Cloud

• A/B Tool: Adobe Target

• Design tool: Figma

BENEFITS
Check out the overview of Life at Box which include general perks and benefits.

Box lives its values, with community and in-person collaboration being a core part of our culture. Boxers are expected to work from their assigned office a minimum of 3 days per week. Your Recruiter will share more about how we work and company culture during the hiring process.

At Box, we believe unique and diverse experiences benefit our culture, our products, our customers, our company, and our world. We aim to recruit a passionate, high-performing workforce that reflects the world we live in. If you are head-over-heels about this role but unsure if you meet all the requirements, we encourage you to apply!

EQUAL OPPORTUNITY

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability, and any other protected ground of discrimination under applicable human rights legislation.

For details on how we protect your information when you apply, please see our Personnel Privacy Notice.

For more details on how Box Poland protects your information, please see our Supplemental Personnel and Candidate Privacy Notice.

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❗️ Important – On-Site Role in Poland, Warsaw❗️
⚡ We are looking for an experienced Senior HTML/Markup Developer to join our development team in Lisbon and help build and style high-quality iGaming websites. You will play a key role in crafting visually engaging and responsive interfaces by focusing on markup and CSS styling, turning Figma designs into fully functional, high-performance web experiences.

🎯 Your Mission:
Contribute to the creation and customization of new iGaming brand websites. You will be responsible for translating design specifications into pixel-perfect, responsive layouts while ensuring consistency, performance, and maintainability across multiple platforms. Collaboration with designers, developers, QA, and product teams will be central to your role.

✅ Responsibilities:
• Set up and customize new brand websites based on design specifications
• Implement and style interfaces following Figma layouts and branding guidelines
• Work closely with designers to fine-tune and resolve design nuances
• Customize and style key website components, including login and registration pages, dashboards, game halls, sports pages, and navigation elements
• Update and manage core framework versions across brands
• Ensure code quality through code reviews and release management
• Support live brands, handling styling updates, fixes, and feature rollouts
• Collaborate with cross-functional teams to deliver seamless user experiences
• Introduce creative ideas and contribute to continuous improvements in design implementation and performance

✅ Requirements:
• 5+ years of professional experience as an HTML/Markup Developer
• Excellent knowledge of HTML (Pug) and CSS (SCSS)
• Strong understanding of UI/UX design principles, responsive design, and cross-browser compatibility
• Proven experience building adaptive layouts and maintaining pixel-perfect visual quality across devices
• Solid knowledge of CSS/JS animations, transitions, and motion best practices
• Experience working with Figma / Sketch / Photoshop for translating design systems into production-ready interfaces
• Familiarity with CSS preprocessors (Sass/Less) and version control tools such as Git
• Understanding of web performance optimization and accessibility standards
• Strong collaboration skills with designers, QAs, and developers in multi-brand or large-scale environments
• Attention to detail, with an eye for visual precision and consistency
• Intermediate or higher level of English

✅ Nice to Have:
• Experience with frontend build tools (Gulp, Webpack, etc.)
• Knowledge of template engines (Pug, Handlebars, etc.)
• Experience working with CSS frameworks (Bootstrap, Tailwind, etc.)
• Understanding of HTML email templates
• Familiarity with Canvas API, WebGL, ThreeJS, or GSAP for advanced visual effects
• Basic knowledge of Angular (for integration purposes only)

✅ Recruitment Process:

1. Interview with the Recruiter: An introductory conversation to get to know you better, discuss your background, and align expectations about the role and the company.
2. Technical Assessment (HackerRank): A short coding challenge designed to evaluate your technical skills and problem-solving abilities.
3. Technical Interview: An in-depth discussion about your technical expertise, hands-on experience, and approach to solving real-world problems.
4. Final Interview with the Hiring Team: A conversation with team members and leadership to assess cultural fit, collaboration style, and alignment with the team’s goals.
5. Offer: If everything goes well, we’ll move forward with a formal offer to join our team.