We are looking for a Senior Full Stack Developer to help build scalable web applications, improve system performance, and deliver a seamless user experience. The role sits at the intersection of technical architecture, backend performance, and user-centric feature development. It suits a developer with a balanced technical and product mindset. Tech stack: SvelteKit · TypeScript · Node.js · PostgreSQL · AWS · SST · Vitest · Playwright WHAT YOU’LL DO

Technical Architecture & Development

Design and implement scalable, efficient features with a focus on maintainable architecture Lead technical discussions and make strategic architectural decisions for new and existing features Build full-stack solutions with SvelteKit, TypeScript and Node.js, keeping code clean, modular and optimized Balance user experience and technical performance to deliver high-quality solutions System Maintenance & Debugging

Diagnose and resolve technical issues to keep the system stable and minimize downtime Implement robust logging, error handling and monitoring to catch issues proactively Refactor and optimize code for performance and scalability, especially on PostgreSQL and AWS Infrastructure & Deployment

Manage and optimize AWS infrastructure with SST,



keeping it scalable and reliable as usage grows Build and maintain CI/CD pipelines for automated testing and deployment Streamline deployment processes for smooth rollouts with minimal user disruption AI-Driven Solutions

Design and build AI-powered tools and features that automate workflows and improve the user experience Experiment with new technologies to integrate AI solutions that scale manual processes and expand product capabilities YOU’LL ALSO

Code Quality & Standards

Lead code reviews focused on edge cases, security and performance Set and enforce coding standards, including error handling, input validation and security best practices Ensure high test coverage with Vitest and Playwright, including edge cases and exceptional scenarios Mentor junior developers and foster continuous learning Security & Compliance

Apply secure coding practices in line with OWASP guidelines Regularly assess and fix security vulnerabilities Respond quickly and effectively to security incidents Performance & Innovation

Monitor system and database performance, identifying and resolving bottlenecks Stay current with new tools and technologies and propose improvements to the platform Collaboration & Client Support

Work closely with product managers and designers to align development with business goals Provide technical insights and answers on client queries and requirements Collaborate with clients and stakeholders to resolve technical issues Contribute to a collaborative team culture built on knowledge sharing

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📌 Full Stack Developer (Barcelona)
🏢 Pack
📍 Barcelona