At Gradion, we consult businesses with Digital and Deep Tech. With over 23 years of experience and a global team of 300+ experts across 7 countries, we’ve delivered measurable technology solutions across E-commerce, retail, mobility, travel & logistics, and intralogistics.Powered by the AI-first foundation, our journey is defined by customer stories of bold transformations in Business, Technology and People. We have partnered with ambitious companies to shape the strategies, systems, and technologies that support their growth. From large-scale platforms to AI, data, cybersecurity, and robotics, Gradion delivers practical, future-ready solutions for the next generation of Billion Dollar Companies. Our key values:🔹 Fairness – We treat our colleagues, clients, shareholders, and the environment with integrity and respect.🔹 Entrepreneurship – We think like entrepreneurs, taking smart risks and turning ideas into real impact.🔹 Excellence – We go beyond expectations to deliver results that truly make a difference At GRADION, we don’t just hire great developers - we empower and support them to create impactful, high-quality experiences. If you're passionate about Shopify development, performance optimization, and delivering world-class eCommerce solutions, we’d love to meet you for the Senior Fullstack Developer position. What You’ll DoWe are looking for a Senior Fullstack Developer to join our team and play a key role in building and optimizing high-performing e-commerce solutions for scaling businesses.Frontend Development: Implement UI/UX improvements with a mobile-first approach (90% mobile traffic).Manage multi-currency & multi-language Shopify storefronts (Shopify Translate App, Localize).Develop new features to enhance store performance and user experience.Optimize the subscription model UX (reduce clicks, improve conversion rates).Conduct A/B testing & tracking to refine user interactions.Enhance the Shopify Admin interface for a smoother backend experience.Backend Development: Maintain & update payment gateway integrations (Apple Pay, Google Pay, Credit Card, PayPal, Stripe, Klarna, etc.).Develop Klarna payment integration, including monitoring & logging error webhooks.Maintain & improve Recharge subscription tracking, including API updates and webhook event logging.Implement robust monitoring & error tracking for better system stability.