Senior Frontend Engineer (React & SSR)

Description

Job Summary: We are seeking an experienced Frontend/Full-Stack Developer to join our team, contributing to digital transformation and delivering value through innovation and sustainable development. Key Highlights: 1. Development of complex digital products in modern environments 2. Focus on code quality, best practices, and automated testing 3. Collaboration in multidisciplinary teams with a high degree of autonomy and ownership We are knowmad mood! We are a leading digital transformation company, continuously evolving and at the forefront of technology. We were founded to drive real change through innovation and sustainable development, with a mission to deliver value to our clients and empower our talent. Comprising over 3\.000 creative, digital, and innovative individuals connected by purpose and capable of building connections with people worldwide. A responsible, flexible team with strong adaptability to our clients’ and the market’s needs—while consistently delivering value, vision, creativity, expertise, professionalism, and passion for technology in every project. The values guiding us toward excellence are collaboration, innovation, commitment, fun, and trust. **What We Value:** At least **5 years of experience as a Frontend / Full-Stack Developer**, actively involved in developing **complex digital products** within modern environments. * Solid experience with **React** and current frontend ecosystems. * In-depth knowledge of **Server-Side Rendering (SSR)**, hydration, and caching strategies. * Experience building **backend layers or BFFs** using **Node.js, Python, or Kotlin**. * Emphasis on **code quality**, best practices, and automated testing. * Ability to work in multidisciplinary teams with **a high degree of autonomy and ownership**. * Strong technical communication skills and sound judgment in decision-making. **Your Responsibilities:** * **Advanced Frontend Development:** Design and implement complex interfaces using **React**, ensuring production-grade quality, maintainability, and scalability. * **SSR and Performance:** Apply **Server-Side Rendering** strategies, performance optimization, **Core Web Vitals**, and **technical SEO**. * **Backend & APIs (BFF):** Develop and maintain business logic and data orchestration layers using **Node.js, Python, or Kotlin**. * **Testing and Quality:** Implement **unit and E2E testing** (Jest, Vitest, Playwright, Cypress) and integrate them into **CI/CD pipelines**. * **Observability:** Configure and maintain **monitoring, logging, and error management** solutions (Datadog, Sentry, New Relic). * **Technical Collaboration:** Work closely with other developers, product, and business stakeholders—providing technical insight and supporting informed decisions. **Additionally, we highly value experience and/or knowledge in:** * **CI/CD** with integration of automated tests and deployments. * **Scalable frontend architectures** and engineering principles (SOLID, design patterns). * **Optimizing Time to Market**, balancing technical quality and pragmatism. * Technical documentation and **code reviews** as standard practice. * Agile environments and distributed teams. * Strong **technical and conversational English**. And with us, you’ll enjoy: Permanent Contract **100% REMOTE** Internal training and access to certifications. View our calendar here: https://www.knowmadmood.com/es/talento/formacion Flexible compensation plan (health insurance, transportation, childcare vouchers, meal vouchers) Become a brand ambassador through our friend referral program Refer your friends and earn a bonus! Events, meetups, tech days, talks… and much more! 26 days of leave (22 vacation days, 2 personal days, and December 24th and 31st as default holidays) Working hours: 8\.30–18:00 (flexible) Monday–Thursday; Friday 8:00–15:00; Summer intensive schedule (July & August): 8:00–15:00 Stay updated on our news by following us here \-\> knowmad mood *At ***knowmad mood***, we are committed to equal opportunities and respect for diversity. We apply our Equality Plan and the principle of non-discrimination across all recruitment processes.*