Senior Backend Engineer (f/m/d)

## About the role At Moss, we give finance professionals the power to automate their day-to-day and make forward-thinking decisions. Our team and culture make us unique — we're driven by impact and growth, where every one of us strives to learn and excel. Recognised by Sifted's Rising 100 and LinkedIn's Top Startups, we're here to help propel your career and together, make Moss a lasting success. Our Engineering teams are seeking Senior Backend Engineers (f/m/d) for a variety teams in Warsaw. The following teams have open positions: - Sales Enablement - Pricing & Billing - Acquisition - Spend Management - Activation & Card Spend 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. - Deliver