Salary range: B2B - 25-28 E/h + VAT 💰Ciklum is looking for a Senior QA 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:Ciklum is looking for a Senior QA Engineer to join our team full-time in Poland to work on Boerse Stuttgart’s trading applications.The project focuses on maintaining and extending mission-critical trading systems ensuring stability, scalability, and real-time data integrity. You will work in a cross-functional agile team, closely collaborating with developers, analysts, and DevOps to validate trading workflows, and ensure consistent quality across high-availability environments.This role requires strong analytical and technical skills, experience with manual testing of backend and UI components, and a proactive approach to process improvement and test design in complex financial systems.Responsibilities: Design, plan, and execute manual test cases for backend services and trading modules Ensure end-to-end system validation across multiple components and data flows Review and verify RESTful APIs using tools such as Postman, Swagger, or custom scripts Build and maintain regression test suites (e.g., with XUnit, NUnit, or similar frameworks) Collaborate with developers to ensure proper test coverage and defect resolution Participate in sprint planning, backlog grooming, and release validation activities in Jira Maintain and improve test documentation and procedures in Confluence / AsciiDoc Perform functional, regression, smoke, and integration testing in complex environments (multiple configurations and components) Validate network communication (TCP/IP) and ensure correct message flow between trading modules Support continuous improvement by identifying gaps in processes, documentation, and tooling Work closely with the QA Lead and product teams to ensure stable, compliant, and high-performing releases Requirements: 5+ years of experience in QA / Testing, preferably in financial or trading systems Strong knowledge of software testing principles, including regression, integration, and system testing Experience with API testing (Postman, Swagger, REST clients) Solid understanding of SQL and ability to validate data consistency in MSSQL databases Familiarity with TCP/IP, socket communication, and message-based architectures Proficiency in Jira (issue tracking, reporting) and Confluence for documentation Strong analytical mindset and attention to detail Excellent communication skills and ability to collaborate in a distributed team Desirable: Experience with CI/CD integration for testing pipelines (GitLab, Jenkins) Familiarity with Docker and containerized test environments Knowledge of performance and load testing tools (JMeter, k6, etc.) Understanding of message brokers (Solace, Kafka, RabbitMQ) Experience in financial/trading domain testing and regulatory compliance validation Basic knowledge of monitoring tools for QA in microservice environments 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 Wrocław and Gdańsk, 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.