Senior Full Stack Engineer (Kotlin) - B2B

We’ve signed up to an ambitious journey. Join us! As Arrive, we guide customers and communities towards brighter futures and more livable cities, it isn’t a challenge just anyone could take on. Luckily, we have something to help us make it happen. Our people and our values. We Arrive Curious, Focused and Together. Just as our entire brand is inspired by the North Star, the shining light leading travelers to their destinations since time began, our values guide us. They help us be at our best. For our customers. For the cities and communities we serve. For ourselves. As a global team, we are transforming urban mobility. Let’s grow better, together. As a Senior Full Stack Engineer within our B2B team, you will join a stable yet evolving department that serves a massive global client base of over 80 million users. Team Responsibilities Partner with Product Managers and engineers to define, prioritize, and deliver work Actively participate in team ceremonies such as stand-ups, refinements, retrospectives, and quarterly planning Contribute to improving team processes and ways of working Develop a strong understanding of user needs, internal stakeholders, and business goals Share ownership of delivery quality and outcomes Mentor and support other engineers when needed Collaborate with global teams to build shared system knowledge Tech Stack Core technologies Kotlin Spring Boot PostgreSQL Kafka Gradle Infrastructure & tooling Docker AWS GitHub Nice to have Java JavaScript What You’ll Do Design and deliver backend features and technical improvements aligned with company goals Build and maintain RESTful APIs using a microservices architecture Perform thoughtful peer code reviews and contribute to a strong feedback culture Use automated testing to improve quality and speed of delivery Release features safely using feature flags and progressive rollouts Define success metrics and monitor the performance of new releases Participate in an on-call rotation to help respond to and resolve incidents Collaborate closely with product, engineering, and cross-functional teams across time zones What We’re Looking For 4+ years of experience in a backend engineering role Strong experience designing and integrating REST APIs into production systems Solid understanding of microservice-based architectures Experience with stream processing technologies such as Kafka or RabbitMQ Familiarity with containerization tools like Docker Strong problem-solving skills and the ability to work independently and as part of a team Excellent written and verbal communication skills Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience) Why Join Us? A standout perk of this role is the opportunity to heavily upskill in AI; Arrive invests deeply in AI initiatives and trainings to boost engineering workflows. *** While this position is located in Łódź, we are open to candidates based anywhere in Poland who are available to travel to the office as needed to meet business requirements.