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
· PlaywrightWHAT YOU’LL DOTechnical Architecture & DevelopmentDesign and implement scalable, efficient features with a focus on maintainable architectureLead technical discussions and make strategic architectural decisions for new and existing featuresBuild full-stack solutions with SvelteKit, TypeScript and Node.js, keeping code clean, modular and optimizedBalance user experience and technical performance to deliver high-quality solutionsSystem Maintenance & DebuggingDiagnose and resolve technical issues to keep the system stable and minimize downtimeImplement robust logging, error handling and monitoring to catch issues proactivelyRefactor and optimize code for performance and scalability, especially on PostgreSQL and AWSInfrastructure & DeploymentManage and optimize AWS infrastructure with SST,



keeping it scalable and reliable as usage growsBuild and maintain CI/CD pipelines for automated testing and deploymentStreamline deployment processes for smooth rollouts with minimal user disruptionAI-Driven SolutionsDesign and build AI-powered tools and features that automate workflows and improve the user experienceExperiment with new technologies to integrate AI solutions that scale manual processes and expand product capabilitiesYOU’LL ALSOCode Quality & StandardsLead code reviews focused on edge cases, security and performanceSet and enforce coding standards, including error handling, input validation and security best practicesEnsure high test coverage with Vitest and Playwright, including edge cases and exceptional scenariosMentor junior developers and foster continuous learningSecurity & ComplianceApply secure coding practices in line with OWASP guidelinesRegularly assess and fix security vulnerabilitiesRespond quickly and effectively to security incidentsPerformance & InnovationMonitor system and database performance, identifying and resolving bottlenecksStay current with new tools and technologies and propose improvements to the platformCollaboration & Client SupportWork closely with product managers and designers to align development with business goalsProvide technical insights and answers on client queries and requirementsCollaborate with clients and stakeholders to resolve technical issuesContribute to a collaborative team culture built on knowledge sharing

📌 Full Stack Developer (Barcelona)
🏢 Pack
📍 Barcelona