Top Front End Developer Jobs in Valencia

Build and maintain scalable, performant, testable user interfaces and product features using React and TypeScript. Lead major frontend components, improve software architecture, and ensure consistent experiences across devices, browsers, and settings. Collaborate with backend, Android, iOS, product, and design teams to deliver consumer-facing products. Own engineering projects, define success metrics, validate decisions, and prioritize privacy and user experience.

Build and optimize ZOE’s customer-facing website using TypeScript, React, and Next.js, with a strong focus on accessibility, performance, responsive design, and design-system development. Collaborate with designers, analysts, and product teams on user experiences and A/B testing. Contribute to backend services using Kotlin or Python, support API development, write maintainable code, and ship production improvements regularly.

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.

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.

Own frontend architecture and development for customer onboarding, private-area, billing, savings, and marketing products. Collaborate with international engineering and internal stakeholder teams, deliver customer-facing features, and adapt across business areas in an agile environment. Required expertise includes TypeScript, React, Next.js, GraphQL, CSS-in-JS, testing, and monorepo development. Backend experience with Python, Django, GraphQL, and PostgreSQL is advantageous.

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.

Build and maintain full-stack product features with a strong frontend focus. Responsibilities include evolving frontend architecture, backend services, tooling, and the custom design system; improving performance, reliability, and developer experience; writing unit and end-to-end tests; and collaborating with product, design, QA, and engineering teams. Senior engineers also influence architecture, own design-system development, guide performance decisions, shape UX solutions, and mentor teammates.

Build and maintain scalable full-stack product features with a frontend focus. Contribute to frontend architecture, backend services, design systems, testing, performance, reliability, and developer experience. Collaborate with product, design, QA, and engineering teams to shape solutions. Senior engineers also influence architecture, own the design system, guide performance decisions, and mentor teammates.

Own Restate’s frontend product experience, building fast, accessible, secure interfaces for monitoring durable workflows and distributed systems. Develop data-intensive timelines, charts, filtering, search, live updates, client state, and shared components. Collaborate directly with design, engineering, and founders from concept through production. Improve performance, usability, testing, information design, and safe handling of untrusted content while contributing to API and backend discussions when needed.

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.

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.

Lead the technical vision, architecture, and delivery of high-performance frontend applications, including real-time 2D/3D geospatial visualizations. Build and optimize WebGL rendering pipelines, integrate REST APIs and complex spatial datasets, establish coding and testing standards, troubleshoot performance issues, and mentor frontend engineers. Collaborate with product and executive stakeholders, guide multi-team initiatives, document technical solutions, and oversee software rollouts and improvements.

Develop and maintain scalable frontend web applications and data visualization platforms using React, Redux Toolkit, and Vite. Collaborate with cross-functional teams, implement features, write tests, conduct code reviews, troubleshoot issues, and support RESTful APIs. Contribute to agile processes, accessibility, user experience improvements, and continuous development while using AI tooling responsibly and staying current with modern web technologies.

Lead and grow a Valencia-based cross-platform frontend team (web, iOS, Android). Hire and develop engineers, define engineering operating model (CI/CD, testing, security, accessibility, observability), coordinate with Product/Design/Backend, drive delivery of card-management features to production, set quality thresholds, and establish predictable planning, release cadence and incident learning.

Design, architect, implement, and maintain React and TypeScript web applications. Develop responsive HTML/CSS pages and email templates optimized for SEO and Core Web Vitals. Write unit and integration tests, solve technical challenges, collaborate with the team, and take ownership of project delivery. Preferred experience includes Redux, React Query, Jest, Cypress, and SSR/SSG frameworks such as Next.js, Astro, or Remix.

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 modernize Productboard’s frontend platform, migrating its legacy design system to Spark UI. Design AI-ready module boundaries, API contracts, documentation, and agent workflows involving tool use and autonomous execution. Develop high-performance React applications, validate experiments with users, collaborate with product and design teams, own features through production, mentor engineers, and share engineering knowledge across the organization.

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.