Top Front End Developer Jobs in Seville

Build and evolve Synthesia’s marketing website platform, including Astro components, Sanity schemas, design tokens, rendering, SEO, localization, and AI-assisted development tooling. Own features end to end across frontend, server-side systems, APIs, databases, and deployment infrastructure. Translate Figma designs into responsive, accessible experiences, maintain performance and analytics standards, and guide technical direction, code quality, and adoption across website stakeholders.

Lead front-end development for partner-facing financial web products, including embeddable onboarding modules, partner dashboards, and self-service workflows. Build complex multi-step forms and data-heavy interfaces with React and TypeScript, contribute to Node.js server layers, collaborate on API contracts, and work closely with product, design, and backend teams. Own features from design handoff through production release while maintaining multiple codebases and upgrading business-account APIs.

Owns growth engineering initiatives across acquisition and conversion journeys, including landing pages, signup, checkout, subscriptions, and product launches. Builds fast, accessible front-end experiences using TypeScript, React, and Next.js, while contributing to Kotlin or Python backend services. Partners with marketing, CRM, product, design, and analytics teams; runs A/B tests; measures conversion outcomes; contributes to the design system; and ships continuously with monitoring and testing.

Build and ship healthcare software across the frontend, API, and database using React, TypeScript, Next.js, tRPC, Prisma, and related technologies. Own features end to end, prototype with AI tools, test with patients and care teams, and improve performance, accessibility, reliability, and scalability. Collaborate closely with company leadership in a fast-paced startup environment while developing trustworthy automation for healthcare delivery.

Lead two distributed frontend engineering squads responsible for Grafana’s frontend platform and navigation. Manage and develop senior engineers, oversee hiring and planning, shape technical direction, partner with Product and Design, and own delivery from discovery through rollout. Improve engineering productivity through AI and automation, uphold quality and security standards, support customer and community discovery, and participate in engineering management on-call while driving reliability improvements.

Develop scalable, responsive web applications with React.js, translating designs into accessible, high-quality interfaces. Responsibilities include frontend architecture, state management, performance optimization, API integration, automated end-to-end and unit testing, code reviews, troubleshooting, documentation, and collaboration with backend developers. The role also requires staying current with frontend technologies and contributing to architectural and development best practices.

Own the frontend architecture and production delivery of a multi-brand consumer platform built with React, Next.js, and TypeScript. Responsibilities include creating a configurable multi-brand system, owning a design system and component library, converting AI-built prototypes into production features, using AI coding agents, and ensuring high UI quality, performance, accessibility, and Core Web Vitals. The role requires autonomous end-to-end ownership and daily production coding.

Leads and mentors a frontend engineering team while remaining hands-on with coding, architecture, code reviews, and technical delivery. Owns migration to Nuxt.js and server-side rendering, performance engineering, Core Web Vitals, and technical SEO. Manages team performance, career development, and work allocation while collaborating with product, backend, and cross-functional stakeholders to deliver scalable, high-quality software.

Develop frontend interfaces and A/B experiments for a health-focused AI product using Vue 3, TypeScript, and Vite. Improve design systems and AI-assisted development workflows, own features from concept through production, collaborate across engineering, design, product, and analytics, and optimize performance, reliability, and development velocity using user data and experimentation results.

Develop and maintain responsive frontend applications using TypeScript, integrate APIs and services, implement UI/UX designs, optimize performance and scalability, apply frontend security and data protection practices, troubleshoot issues, participate in code reviews, and contribute to open-source privacy-focused projects.

Own end-to-end frontend delivery for AI-powered healthcare products across patient, clinician, and administrative applications. Develop and maintain a large Angular codebase, design scalable architectures, write tested code, improve performance and platform health, and contribute to Nx monorepo, CI/CD, and framework upgrades. Build interfaces for AI features while using agentic development tools. Collaborate cross-functionally and work across API, backend, and SQL layers when needed.

Build and own complex, high-performance frontend experiences for observability products using Angular or another major frontend framework. Lead frontend architecture, translate complex data into intuitive interfaces, collaborate cross-functionally, write tested production code, review code, mentor engineers, and drive features from concept through production.

Lead the frontend architecture and migration from Svelte to React, evolve the design system, improve performance, accessibility, testing, developer experience, and technical quality across teams. The role requires staff-level technical leadership, cross-functional influence, mentoring, strong product judgment, and practical use of AI coding and agentic development tools.

Lead and mentor frontend software engineers, guide frontend platform architecture, contribute to code and technical design, and build scalable, performant web experiences. Partner with Product and Design to translate business needs into technical solutions, improve engineering standards and tooling, and drive enhancements in quality, reliability, developer experience, and delivery.

Build and improve high-quality web products and reusable design-system components. Own frontend performance, including data loading, caching, server rendering, and streaming. Apply strong product judgment to complex UX problems and collaborate with designers, engineers, and product leaders. Work autonomously across products, establish frontend quality standards, and help elevate team practices through technical leadership and craftsmanship.

Lead frontend architecture and development for high-traffic, real-time booking interfaces. Build reusable UI systems, shared data-access layers, and real-time synchronization features. Drive frontend migrations into a monorepo, improve TypeScript and CI tooling, establish testing and monitoring practices, ensure reliable releases, and mentor engineers across product squads.

Verify the front end of high-performance RISC-V CPU cores, including instruction fetch, branch prediction, decode, dispatch, and speculative execution. Develop verification strategies, SystemVerilog/UVM testbenches, constrained-random tests, assertions, and functional coverage. Debug RTL and simulation failures using waveforms and collaborate with CPU architects, RTL designers, and software teams to identify root causes and ensure correctness across workloads and corner cases.

Own complex frontend features across web and mobile, design React and React Native systems, improve rendering and runtime performance, and build maintainable shared abstractions. Collaborate with product, backend engineering, and QA to deliver simple user experiences. Maintain quality through code reviews and unit, end-to-end, and visual-regression testing while mentoring colleagues and improving frontend engineering standards.

Shape frontend architecture and technical direction across React, React Native, and an Nx monorepo. Own shared libraries, platform capabilities, design-system foundations, developer tooling, performance, testing, migrations, and developer experience. Diagnose systemic web and mobile issues, remain hands-on with implementation and investigation, influence cross-team decisions, partner with product and engineering, and mentor senior engineers while improving reliability and product quality.

Build and maintain user-facing features and interfaces for Restream web services. Design and implement UI and business logic, collaborate with product designers and engineers, perform code reviews, improve reliability and scalability, and evaluate emerging technologies.

Design and implement complex customer-facing frontend features using TypeScript and React. Provide technical leadership, mentor junior engineers, drive frontend architecture and best practices, improve performance and accessibility, partner with product/design, integrate with backend APIs, and manage technical debt and scalability.

As a Senior Front-End Software Engineer, you'll design and implement services, contributing to the architecture and product strategy in a fast-paced environment.

The Senior Frontend Engineer will optimize and refine existing code, implement UX/UI improvements, and maintain high code quality, working autonomously and collaboratively with designers and engineers.

SynergyOS seeks software engineers for backend, frontend, and DevOps roles to build a productivity platform for enterprises, enhancing office workflows.

The role involves designing, building, and implementing new services, working closely with the product team, and taking ownership of projects from 0 to 1.