--- title: "Backend Engineer (f/m/d)" company: "Moss" company_url: "https://www.remjobs.works/companies/moss" url: "https://www.remjobs.works/job/moss-backend-engineer-f-m-d-030ea0c7-dd74-476d-be4a-73778a55ed2b" apply_url: "https://jobs.ashbyhq.com/moss/53d46420-3605-4f98-85e5-7d1a4f3cd979" workplace: hybrid location: "Warsaw" employment_type: full-time seniority: mid role: software-engineering region: europe skills: ["java"] date_posted: 2026-07-13T08:51:55.824Z first_seen_by_remjobs: 2026-08-27T09:27:30.871Z --- # Backend Engineer (f/m/d) **Moss** — Warsaw Apply: https://jobs.ashbyhq.com/moss/53d46420-3605-4f98-85e5-7d1a4f3cd979 ## About Moss Moss is building the real-time semantic search runtime for conversational and multimodal AI. Our system enables voice agents, copilots, and chat interfaces to retrieve, reason, and respond in sub-10 ms, delivering the responsiveness that makes AI interactions feel truly natural. If you’ve ever built a conversational or voice AI product, you’ve felt the lag. That moment when an agent pauses and the illusion of intelligence breaks. The bottleneck is almost always retrieval. Each query hops across networks and databases, adding delay and cost. Moss eliminates that gap by keeping retrieval close to where the agent runs. Moss runs natively across browsers, mobile devices, and servers with an optimized vector index built in Rust and WebAssembly. It enables teams to build AI products that feel instant, contextual, and adaptive. The experiences that sustain engagement and unlock new kinds of interaction. For our customers, this translates into tangible business value: stronger user retention, higher conversion, and entirely new product categories made possible by real-time understanding. Moss is already powering production pilots across voice AI and developer platforms, achieving sub-10 ms retrieval and 70–90% token savings compared to traditional pipelines. ## 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](https://sifted.eu/rankings/b2b-saas-rising-100-2024)** and **[LinkedIn's Top Startups](https://www.linkedin.com/pulse/linkedin-top-startups-2024-20-aufstrebende-unternehmen-bjd0c/)**, we’re here to help propel your career and together, make Moss a lasting success.** Our **Engineering teams** are seeking Mid-level Backend Engineers (f/m/d) for a variety of different 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. - 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 well as support individuals throughout all phases of a project.**About Moss** Moss is the Finance AI platform for Europe's mid-sized businesses, giving companies real-time visibility and full control over their spend. By automating card issuing, invoice management and expenses, Moss simplifies financial workflows and frees finance and accounting teams from manual, administrative work. Founded in Berlin and used by more than 5,000 businesses including Flink, Schufa, Gusto and Auto1, Moss has raised €200+ million to date and operates in Germany, the Netherlands, the UK and further EU markets. Moss is backed by the most renowned tech investors including Valar Ventures, Tiger Global, Global Founders Capital, Cherry Ventures, A-Star and Portage. We have a team of 300+ people from 50+ nationalities in 5 offices across Europe. Be part of a culture that thrives on impact and speed, where you can take bold moves, learn fast and accomplish more. We’re a place where you can fast track your career - here's **what else to expect:** - Top-of-market compensation package, including equity. - Our vibrant offices are at the heart of our culture, where in-person time fuels collaboration and connection over weekly breakfasts and Friday demos. - Additional benefits include: 20 days “work from abroad”, 600EUR/GBP Learning & Development Budget, and other local benefits.*Unless stated otherwise, benefits apply to full-time positions (interns and working students receive a tailored package).* ***By applying for the above position, you will confirm that you have reviewed and agreed to our ***[Data Privacy Policy](https://www.getmoss.com/privacy-policy)***.*** --- Source: Moss's own career page, read by RemJobs. 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