Senior Full Stack Engineer (React & Java)

Senior Full Stack Engineer (React & Java)We build and operate Connect, a SaaS platform for the beauty & wellness industry that helps entrepreneurs run their businesses more effectively, built by Treatwell . Our web products are used daily by tens of thousands of people across 13 European countries. Our teams own their areas from initial idea and design through deployment and operations. We focus on writing maintainable, scalable code while balancing legacy and modern technologies. We encourage engineers to experiment with new ideas, learn from mistakes, and improve our systems continuously. You will be responsible for: Take ownership of features across the stack, from database schema and backend services to the UI, from design through deployment and operations. Pair with engineers, designers, and PMs to ship features every cycle, iterating based on real usage and feedback. Participate in design and code discussions, making trade-offs and decisions that affect the product and the team. Maintain a strong focus on automated testing, applying the testing pyramid to ensure unit, integration, and end-to-end coverage. Improve observability across services and the frontend by adding metrics, dashboards, and alerts with tools like Datadog, Sentry, and web vitals, so issues are caught before they impact users. Design and build backend services and APIs in Java and Spring Boot, including event-driven flows with RabbitMQ. Own your services end-to-end, with a DevOps mindset, from