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, you will be part of a cross-functional team with full ownership of the product and codebase. You will participate in all stages of the development lifecycle — from ideation and design to architecture, implementation, deployment, and maintenance. This project enhances trust and transparency on a global consumer review platform by detecting and preventing fraudulent activities, such as fake reviews, and ensuring policy compliance through AI, data analysis, and scalable fraud detection systems.Responsibilities:  Collaborate closely with Product, Design, and Data Science in a full ownership team Drive system design and technical decision-making Use TypeScript to develop scalable backend services and clean, reusable frontend components Build and maintain RESTful APIs and distributed cloud services Contribute to planning, implementing, and releasing new features Troubleshoot and resolve issues across the tech stack Write clean, maintainable, and testable code Actively participate in code reviews and team discussions Support and inspire the team with your technical expertise and problem-solving mindset  Requirements:  5+ years of hands-on experience in full stack web development Strong knowledge of TypeScript Experience with AWS services (e.g., ECS, Lambda, SQS, SNS) Skilled in building and consuming RESTful APIs Experience working with NoSQL databases (e.g., MongoDB, DynamoDB) and relational databases (e.g., PostgreSQL) Familiarity with containerization using Docker Hands-on experience with DevOps practices and CI/CD pipelines Experience with monitoring and logging tools (e.g., CloudWatch, Datadog) Understanding of cloud infrastructure as code (e.g., CloudFormation) Strong problem-solving skills and attention to code quality Upper-intermediate or higher level of spoken and written English Desirable:  Experience with GCP and services like BigQuery Exposure to Python and Node.js Hands-on experience with .NET on the backend Frontend experience with React, Next.js, CSS Modules, SASS, or Styled Components Familiarity with event-driven architectures and microservices Experience in data analysis or fraud detection solutions Personal skills:  Accountability: You take ownership and follow through on your responsibilities Drive: You're proactive and results-oriented, always seeking better ways to solve problems Self-development: You stay curious, seek feedback, and aim for continuous improvement Effective communication: You communicate your ideas clearly and collaborate effectively in a team Mentoring: You're open to helping less experienced team members and sharing knowledge 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.