# Senior Full-Stack Engineer \(Berlin\) - Company: [Kadmos3]() - Location: Berlin, UK, Remote - Remote: Yes - Team: Engineering - Posted: October 27, 2025 ## Job description ### About the opportunity # About the opportunity We are looking for a Senior Full-Stack Engineer who will take ownership of crucial engineering activities at Kadmos. As a regulated salary payment provider in the shipping industry, we are building secure, reliable, and scalable financial solutions that empower seafarers and shipping companies worldwide. You will play a central role in shaping both the backend infrastructure and frontend experience of our platform, driving innovation in a highly regulated environment. ### What you can expect * **Own the full stack**. You will be responsible for developing and maintaining core backend systems and frontend applications, building reusable libraries, implementing complex financial components, and integrating with external service providers. * **Work with independence**. You’ll be trusted to take full ownership of your responsibilities, while collaborating closely with product, compliance, and engineering teams. * **Impact at scale**. You will contribute directly to a platform serving the global shipping industry, with the opportunity to design systems that handle secure financial transactions and deliver exceptional user experiences. * **Collaborative environment.** We value diversity, transparency, and teamwork. You’ll join an open and supportive culture where everyone’s input matters. # **What you bring along** * **5+ years of professional experience** in full-stack development with **Java** Spring Boot and **React**. * Master’s degree in Computer Science, Mathematics, or Physics. * **Backend Proficiency**: Expertise in Java with strong knowledge of Spring Boot and modern frameworks, SDKs, API standards, and libraries. * **Frontend Proficiency**: Expertise in React with a strong emphasis on TypeScript. Experience with Redux, React Query, styled-components, MUI Component Library, or similar tech stack. * Extensive hands-on experience in developing **scalable and testable high-quality solutions** in an agile environment. * Solid experience with **unit, integration, and performance testing** (JUnit, Spock, Testcontainers on the backend; React Testing Library and Cypress on the frontend). * Strong understanding of building secure, reliable, and scalable systems, ideally in a regulated or financial services context. * Proactive, ambitious, and collaborative mindset with a track record of delivering high-quality solutions. * Fluency in English. # Why us * 🌱 Opportunity to work in a company with direct social impact * 💰 Attractive compensation * 🇺🇦 Open & International environment * 🏛️ Fantastic location in the heart of Berlin & flexible WFH policy * 🥘 Free lunch at the office * 💻 Latest equipment, to ensure you have everything needed ### About the company *Kadmos is on an ambitious mission to revolutionise salary payments to migrant workers. The Berlin-based startup was founded in 2021 by MIT graduates Justus Schmueser and Sasha Makarovych to bring fintech, low margins, and transparent FX to industries riddled with opaque mark-ups, kickbacks, and physical cash transactions.* *Backed by renowned VCs Addition and Atlantic Labs, Kadmos has raised more than $39 million since 2021. The company intends to use the funding for expanding across industries and further accelerating product development. For more information, visit * ## Apply [Apply on Kadmos3]() Canonical job page: