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Full Stack Developer

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Summary

Senior full-stack developer at Pack in Barcelona building scalable web applications with SvelteKit, TypeScript, and Node.js on PostgreSQL and AWS (managed via SST). Day-to-day spans architecture decisions, performance tuning, CI/CD, testing with Vitest/Playwright, OWASP-grade security, and building AI-powered features.

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

Skills

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See also

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