About the role

At Moss, we give finance professionals the power to automate their day-to-day and make forward-thinking decisions. Our culture is what makes that possible: we play to win, we obsess over quality, and we win as One Moss, and it works. Moss closed a €35 million Series C in August 2026, crossing a €1 billion valuation, and became one of Europe's fintech unicorns. Join us for what's next. We are looking for a Senior Backend Engineer (f/m/d) for our Accounting tribe in Tallinn. Collaborating closely with designers, product managers and frontend engineers, you will bring innovative ideas to life, ensuring our product helps business automate and simplify everyday tasks with intuitive and efficient tools. Your responsibilities Here's a bit more on what you can expect to be doing day-to-day: - Backend Development: Lead the development of the application, ensuring it aligns with the product requirements and meets performance and usability standards. Proactively provide regular updates on work progress, achievements and challenges to product managers (PMs) and designers. - Collaborative Planning: Partner with PMs and designers during project kick-offs to gain a comprehensive understanding of the overall vision, user needs, and goals. Provide valuable insights to refine UI/UX concepts and contribute to the planning of backend development. - Frontend Collaboration: Collaborate closely with frontend engineers to determine required APIs and frontend functionality. Maintain clear communication channels to ensure smooth integration of frontend and backend components. - Testing and Quality Assurance: Produce well tested and reliable code. Writing unit and functional (end-to-end) tests. - Rollout and Performance Monitoring: Collaborate with product managers to devise efficient rollout strategies for new features. Monitor performance and user feedback to identify areas for improvement and proactively address potential issues. About you We think you’ll need the following experience and qualifications to succeed in this role:  - Proven experience as a Backend Engineer, leading projects end-to-end to launch.  - Proficiency in Java development technologies (incl. Spring framework), as well as latest features and best practices such as microservices, message queue, alerting, reliability and feature flags. - Understanding of development design patterns and techniques, incl. Rest API design principles. - Hands-on experience with testing approaches and libraries (unit testing, integration testing). - You are fluent in English. In addition, here are the skills and attributes we are looking for: - Pragmatic Tech Enthusiast: You have the theoretical and practical background to engineer our product. You pursue quality and scalability and follow industry and company best practices. You build systems that are easy to maintain and to understand by others. - Delivery Focused: You understand and focus on what is important to deliver the most impact. This means accurate development and delivery estimations, ruthless prioritization and saying no to less important things. You are driven to deliver tangible outcomes within estimated timelines, and you swiftly tackle challenges, and provide clear direction to others. - Collaborative Communicator: You convey information effectively to a variety of audiences, and actively participate in daily meetings, keeping others informed about your progress and status. You’re able to form trustworthy connections by creating and maintaining open communication with colleagues throughout the development process. - Inquisitive Mindset: You’re detail-oriented and seek to develop a deep domain knowledge by proactively seeking to understand workflows and technical intricacies. You’re curious and unafraid to question assumptions and propose alternative approaches, ensuring the product is tailored to meet customer needs. - Team Player: You bring a team together to work towards a shared goal, as we