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Senior Full Stack Engineer at FYXER. Remote | Full-time. About Our Client. Our client is a fast-growing, mission-driven fintech company building technology that enables more meaningful financial decision-making at scale. Their platform supports the movement of funds into high-impact causes globally, helping millions of users engage with giving in more intentional and accessible ways.. Since launching, the business has facilitated tens of millions in transactions and continues to scale rapidly across international markets. With a strong product-led approach, they are focused on building reliable, high-performance systems that power impactful user experiences.. About the Role. As a Senior Full Stack Engineer, you’ll play a key role in building and evolving the systems that power a suite of impactful digital products. You’ll take ownership of delivering high-quality features end-to-end, working across the stack to solve meaningful, real-world problems.. You’ll contribute to platform-level architecture, building core services, APIs, and integration layers that enable multiple products to scale reliably. Working closely with product and design, you’ll help define clean system boundaries and make pragmatic decisions that balance speed with long-term resilience.. You’ll join a small, remote-first, product-focused team where engineers have real ownership and influence over technical direction.. Key Responsibilities. Own features end-to-end, from concept through to production, including performance, reliability, and security . Balance speed and quality, making pragmatic trade-offs to support both short-term delivery and long-term scalability . Strengthen core user journeys by improving reliability, reducing friction, and supporting growth . Contribute to system design across APIs, event-driven architecture, and shared services . Build scalable, reusable backend services and clean integration layers . Maintain high engineering standards through testing, code quality, and thoughtful reviews . Mentor and support other engineers, helping unblock delivery and share context . Collaborate cross-functionally with product and design to deliver meaningful outcomes . Work autonomously while communicating clearly and surfacing risks early . About You. You’re an experienced full stack engineer (typically 4–7+ years) who thrives in fast-paced, collaborative environments. You:. Take ownership and deliver meaningful outcomes end-to-end . Contribute thoughtfully to technical decisions and trade-offs . Balance delivery speed with system reliability and maintainability . Are curious, pragmatic, and comfortable learning new domains . Collaborate effectively in remote, cross-functional teams . Your Experience. You’ll bring strong experience across several of the following areas:. Building and shipping full stack applications in production . Backend development (ideally Node.js / TypeScript or similar) . Frontend development using modern frameworks (e.g. React) . Designing and maintaining APIs and integration layers . Working with cloud infrastructure (e.g. AWS, serverless, containers) . Event-driven systems (queues, background jobs, webhooks) . Infrastructure as code (e.g. Terraform, CI/CD tooling) . Bonus experience:. Payments or financial systems . Notifications and messaging systems . Distributed systems and microservices . Identity and authentication flows . Mobile-first backend design considerations . Working in regulated or compliance-heavy environments . Company Location: Spain.