We're seeking a Senior Software Engineer (JavaScript) who is passionate about clean code, modern tools, and building new products 🤖Create an innovative solution powered by Artificial Intelligence and Large Language Models as a:Senior Software Engineer💻 Company: A European MarTech, delivering cutting-edge solutions to over 2,500 brands worldwide, including BMW, Nestlé, and L’Oréal. ​🔧Tech Stack: JavaScript (React/Typescript), HTML5, CSS3✨ Nice to have: GitHub Copilot or VS Code📍 Work location: Poland, remote​ What will your daily tasks look like?​​📌​Build & maintain scalable applications with JavaScript (design/architecture, development, implementation, testing, and maintenance)​📌​ Collaborate with Product designers, PMs & support to bring features to life.📌​ Implement new features and maintain the existing database while owning code quality. (unit, integration, and other QAs tests)📌​Create, maintain, and own code and application documentation. 📌Assist the Support and Engineering team in debugging and troubleshooting software defects. 📌​​Coach and mentor junior devs and help shape the processes and selection of tools. 📌​Dive into architecture & contribute to research and specification phases with Product Managers while exploring new product ideas with the team. We’re looking for​:✅ ​6+ years of practical experience in the development of commercial-grade web-based software applications using JavaScript and front-end technologies: HTML5, CSS3.✅ Proficiency in data-driven web applications. ✅ ​Good understanding of vanillaJS and JavaScript framework libraries (e.g., React, Vue.js).✅ Familiarity with REST and modern tools: Webpack, Node.js, Yarn​.✅ Strong communication & team spirit.✅ Practical use of SOLID programming principles and SCRUM/KANBAN/AGILE workflows.✅ Advanced English skills (spoken and written).✨ Nice to have: GitHub Copilot or VS Code What do we offer?🎖️​ ​Supportive company culture – flat structure, strong teamwork and openness to new ideas.🎖️ ​Remote-first setup. Do you prefer slippers instead of shoes or maybe you are expecting Amazon delivery? No worries, we’ve got you covered.🎖️ ​Private medical packages (Luxmed or Medicover) and Benefits System (multi-sport) will be covered🎖️Freedom to influence tools, architecture, and processes. Hello! I’m Olga and I am responsible for this recruitment process. If you have any questions, please feel free to reach out. I will be happy to meet you!Ref. no: SSEJ/12/2025/P Contact details:👩‍💻 Olga Kamińska,📧 e-mail:[email protected]