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Senior Full-Stack Developer, UK-based at Jobgether. This position is posted by Jobgether on behalf of IONA. We are currently looking for a Senior Full-Stack Developer in United Kingdom.. We are seeking a hands-on and experienced Senior Full-Stack Developer to join a dynamic international team working on next-generation commerce solutions. In this role, you will design and build scalable applications, drive architectural decisions, and take ownership from concept through to deployment and long-term maintenance. You will collaborate directly with clients, providing technical leadership while ensuring quality, performance, and security. This is an opportunity to work with modern technologies in a consultative environment, contribute to innovative digital commerce platforms, and mentor other developers in a supportive, growth-driven culture.. . Accountabilities:. . Design, develop, and implement new applications while maintaining and improving existing ones.. . Write, test, and debug code while ensuring quality through automated testing and CI/CD pipelines.. . Troubleshoot issues across multiple platforms, environments, and cloud architectures.. . Build integrations between internal systems, third-party services, and client platforms.. . Ensure application performance, scalability, and security at all stages of development.. . Provide technical leadership in projects, working closely with client stakeholders in a consultative role.. . Mentor and support other developers, reviewing code and promoting best practices.. . . Senior-level programming experience, with strong knowledge of modern API-based SaaS and responsive web solutions.. . Solid understanding of the full software development lifecycle and experience with headless ecommerce platforms (commercetools preferred).. . Experience with headless CMSs such as Contentful, Sanity, or ContentStack.. . Strong expertise in JavaScript technologies (Next.js, React, Node), SaaS services, and cloud platforms (AWS, Azure, GCP).. . Skilled in CI/CD workflows, automated testing frameworks, and version control systems.. . Strong knowledge of integrations, APIs, and cloud-based data pipelines.. . Excellent communication skills in written and spoken English, able to explain technical concepts to diverse audiences.. . Experience working in cross-functional teams with designers, product managers, and developers.. . Nice to Have:. . Knowledge of application and cloud security practices.. . Interest or skills in project management, UX design, or quality assurance.. . Experience with advanced ecommerce integrations such as payment gateways, ERP systems, or marketing automation.. . Company Location: United Kingdom.