Salary range: B2B - 40-45 E/h + VAT 💰Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Poland.We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.About the role:As a Senior Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. Responsibilities: Support and ensure the operational reliability of the KUREPO invoicing solution Design and implement scalable, resilient, and maintainable systems for our applications Drive technical decisions and promote best practices in coding, testing, and deployment Collaborate closely with Product and Design to translate business requirements into robust technical solutions Proactively identify and address technical debt, performance bottlenecks, and areas for system improvement Mentor and guide team members, fostering a culture of technical excellence and continuous improvement Requirements:  5+ years of professional experience in full-stack web development Proven experience in designing and architecting scalable, distributed systems Strong PL/SQL knowledge Experience with Node.js and React Experience with Oracle databases Hands-on experience with containerization using Docker and orchestration (e.g., ECS, Kubernetes) Proficient with CI/CD practices and tools (e.g., Jenkins, GitLab CI, GitHub Actions) Skilled in working with both NoSQL (e.g., MongoDB, DynamoDB) and relational databases (e.g., PostgreSQL) Strong problem-solving skills and a passion for code quality and technical excellence Upper-intermediate or higher level of spoken and written English Desirable:  Experience with Java, including Spring and SpringBoot Experience with Kafka Proficiency in German Familiarity with event-driven architectures and microservices Familiarity with Infrastructure as Code (e.g., CloudFormation, Terraform) Experience with GCP and services like BigQuery What`s in it for you? Strong community: Work alongside top professionals in a friendly, open-door environment Growth focus: Take on large-scale projects with a global impact and expand your expertise Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies Flexibility: Enjoy flexibility – full remote working possibilities Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations  About us:At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.With delivery centers in Wroclaw and Gdansk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions.Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn. Explore, empower, engineer with Ciklum!Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.