What you will be doing We are seeking a skilled Senior Freelance Web Developer to create with us a new website using a headless CMS over a 2–3 month period. You'll collaborate with our design and marketing teams to implement multi-language content, robust editorial workflows, SEO optimisation, and high performance. Responsibilities Develop a high-performance, accessible website. Model CMS content types to support multi-language and localised content. Implement editorial controls, such as role-based permissions, draft/publish workflows, preview environments, versioning, and scheduled publishing. Ensure strong SEO, including clean URLs, redirects, canonical tags, metadata, and adherence to multilingual SEO best practices. Integrate with external systems. Optimise for performance and accessibility. Manage operations, including secure hosting. Conduct testing and QA. We need you to have 5 years of professional web development experience with successful delivery of production websites. Proficiency in React, with significant experience in Next.js strongly preferred for SEO and internationalisation capabilities. Expertise with Strapi and/or Contentful, focusing on localisation, editorial workflows, and preview configurations. Strong skills in TypeScript, HTML5, CSS (Tailwind or CSS Modules), and version control via Git/GitHub. Experience with API integration (REST/GraphQL), authentication, and state management. Demonstrated expertise in website optimisation for Core Web Vitals, accessibility (WCAG 2.1 AA), and SEO. Experience customising CMS (Strapi plugins, Contentful GraphQL/SDK, webhooks) and conducting data migrations. Proficiency in internationalisation libraries and applying regional content rules. Employment Type Freelance/contractor Start Date: asap, no later than beginning of December Duration: 2–3 months, depends on capacity Location: CET /-2h Capacity: 25–35h per week Benefits If you are based in Berlin, join our lovely office at BackFabrik. About us We are Berlin Bytes. As a creative software development and consulting agency, we help businesses navigate the complexities of the digital landscape and unlock lasting value. Together with our clients we design, build, and scale innovative digital solutions & enterprise applications that deliver tangible results.