Senior Frontend Developer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Frontend Developer based in Spain.

This is a senior frontend engineering opportunity focused on building a high-performance web experience from the ground <up.You> will shape the frontend architecture using SvelteKit, Svelte, Tailwind CSS, and modern TypeScript.The role has a strong emphasis on speed, accessibility, SEO, and measurable Core Web Vitals <performance.You> will establish scalable engineering standards, reusable components, testing practices, and frontend developer experience.Working closely with product, design, and backend teams, you will turn complex requirements into clean, maintainable <interfaces.You> will also embrace agentic AI development workflows and use AI coding tools as an integral part of your engineering process.This is a fully remote European role offering significant ownership within a modern, fast-moving technology environment.

Accountabilities

• As a senior frontend engineer, you will own key technical decisions while establishing a strong foundation for a scalable and performance-focused frontend.
• Architect and develop a new web frontend from the ground up using SvelteKit and Tailwind CSS.
• Define appropriate rendering strategies across SSR, SSG, ISR, and edge computing.
• Establish and maintain performance targets, including LCP below 2.0 seconds, INP below 200ms, and CLS below 0.1 based on real-user data.
• Build and maintain a reusable Svelte component library and scalable design system.
• Translate product requirements and design specifications into clean, composable, responsive, and accessible components.
• Own frontend SEO fundamentals, including semantic HTML, metadata, structured data, sitemaps, and canonicalization.
• Establish frontend testing standards using Vitest for unit testing and Playwright for end-to-end testing.
• Define development tooling and developer experience practices, including linting, formatting, type checking, pre-commit hooks, and CI quality gates.
• Lead code reviews and continuously improve frontend engineering quality and standards.
• Drive technical planning, architecture decisions, ADRs, and broader frontend discussions.
• Integrate frontend applications with backend APIs and contribute to API contract design when relevant.
• Support CI/CD workflows and deployments across AWS infrastructure.
• Monitor, analyze, and optimize frontend performance using tools such as Lighthouse, WebPageTest, and real-user monitoring.
• Incorporate agentic AI development tools into day-to-day engineering workflows to improve delivery speed and effectiveness.

Requirements

• The ideal candidate combines strong frontend engineering expertise with architectural ownership, performance awareness, and a modern approach to software development.
• Strong professional experience building production applications with Svelte and SvelteKit.
• Expert-level knowledge of TypeScript and modern JavaScript.
• Deep experience with Tailwind CSS, including design tokens and scalable approaches that prevent utility sprawl.
• Strong command of HTML5, CSS3, responsive design, and web accessibility.
• Proven experience developing high-performance web applications measured against Core Web Vitals.
• Demonstrated ability to design scalable frontend architectures in greenfield environments.
• Experience creating and maintaining reusable component libraries and design systems.
• Strong understanding of Svelte state management patterns, including stores, context, and runes.
• Hands-on experience with Vitest and Playwright.
• Strong Git and GitHub workflow knowledge, including pull requests, code reviews, and CI/CD.
• Experience with frontend performance monitoring, profiling, and optimization.
• Practical experience implementing agentic development workflows with tools such as Claude Code, Cursor, or equivalent.
• Experience with edge runtimes such as Cloudflare Workers or AWS Lambda@Edge is a plus.
• Experience deploying applications to AWS services such as CloudFront, S3, or ECS is advantageous.
• Experience building CI/CD pipelines and implementing design systems end to end is beneficial.
• Experience integrating AI-powered functionality into production web applications is a plus.
• Previous experience migrating applications from React/Next.js to Svelte/SvelteKit is advantageous.

Benefits

• Fully remote position within Europe.
• Full-time employment with a daytime working schedule.
• Opportunity to build and scale a B2B technology platform from the ground up.
• Up to 28 days of annual leave, in addition to public holidays.
• Truly global remote environment with colleagues working across different regions.
• Significant ownership over frontend architecture, engineering standards, and product performance.
• Opportunity to work with modern technologies including SvelteKit, Tailwind CSS, TypeScript, AWS, and AI-assisted development tools.
• Exposure to greenfield architecture, performance engineering, design systems, accessibility, SEO, and modern testing practices.
• Collaborative environment working closely with product, design, backend, and other technical stakeholders.
• Opportunity to influence the long-term technical direction of a growing platform