Senior Frontend Engineer in Quinta de Portugal, Castelo Branco at Jobgether

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Frontend Engineer in Portugal.

You will join a fast-growing product engineering environment focused on building scalable, high-performance frontend systems for modern SaaS infrastructure. In this role, you will take ownership of a complex frontend application used by high-profile companies and contribute directly to the evolution of a critical developer-facing product. You will work closely with Product and Backend Engineering teams to design, build, and ship robust features that combine usability, performance, and long-term maintainability. The environment is highly autonomous and requires strong ownership, proactive decision-making, and the ability to navigate ambiguity. You will also play a key role in shaping frontend architecture, improving observability, and maintaining design system consistency across the platform. This is a high-impact role for an experienced engineer who thrives in fast-paced, technically demanding, and collaborative product teams.

• Own and evolve a complex frontend application, ensuring high standards of performance, reliability, scalability, and usability across all features.
• Collaborate with Product and Backend Engineering teams to design and implement new features from concept through to production delivery.
• Build, maintain, and scale a robust design system to ensure UI consistency and efficient development across the product.
• Improve frontend observability by implementing monitoring, logging, and debugging practices to proactively identify and resolve issues.
• Drive frontend architecture decisions, ensuring long-term maintainability and technical excellence.
• Work autonomously in a fast-paced environment, taking full ownership of tasks and delivering them end-to-end.
• Contribute to continuous improvement of engineering practices, code quality, and development workflows.

• 5+ years of professional experience in frontend engineering with strong expertise in modern JavaScript frameworks.
• Expert-level proficiency in React and its ecosystem.
• Proven experience building and scaling design systems in production environments.
• Strong understanding of frontend performance optimization, monitoring, and observability practices.
• Comfortable working in autonomous, fast-moving, and ambiguous environments.
• Strong communication skills, with the ability to collaborate effectively across Product, Engineering, and Design teams.
• Ownership-driven mindset with a proactive and solution-oriented approach.
• Commitment to high-quality engineering, including maintainability, scalability, and performance.

Nice to have:

• Experience with GraphQL.
• Exposure to developer tools, infrastructure products, or open-source ecosystems.
• Background in fintech, billing systems, or data-intensive frontend applications.
• Contributions to or participation in open-source projects.

• Competitive salary ranging from €60,000 to €90,000 per year.
• Stock options as part of the compensation package.
• Fully remote work across Europe.
• Opportunity to work on a widely adopted open-source billing platform used by leading global companies.
• High level of autonomy and ownership over core frontend systems.
• Collaborative, high-performance engineering culture focused on excellence and continuous improvement.
• Exposure to complex, large-scale SaaS and fintech-related technical challenges.
• Opportunity to shape the frontend of a fast-scaling developer-first product.