Non-Functional Tester

About the project We are looking for an experienced Non Functional Tester to join a team working on the expansion and development of a modern payment transaction processing platform. The solution is based on a microservices architecture, and the project offers the opportunity to work with advanced technologies while influencing the system architecture and the overall product development.     Location: 100 % remote  Responsibilities • Define, own, and continuously improve end‑to‑end non‑functional testing strategies, covering areas such as performance, scalability, reliability, and resilience. • Design, develop, and maintain automated test scenarios, scripts, and traffic simulations reflecting real‑world usage patterns. • Execute non‑functional test suites and ensure test environments are correctly prepared, stable, and representative of production. • Analyse and interpret test results, identify bottlenecks, risks, and improvement areas, and translate findings into clear action items. • Prepare clear and structured reports, presenting metrics, conclusions, and practical recommendations to technical and non‑technical stakeholders. • Work in close cooperation with development teams, DevOps engineers, and architects to align performance expectations, technical constraints, and quality goals across the delivery lifecycle. Requirements Must have • 7+ years of professional experience in software testing, quality engineering, or related technical roles, with a strong focus on non‑functional testing. • Ability to write production‑quality code using an object‑oriented language, ideally Java or another JVM‑based technology. • Solid hands‑on experience with containerized and cloud‑native environments, including platforms such as Kubernetes and OpenShift. • Proven expertise in defining, owning, and executing non‑functional testing strategies, including planning, coordination, and reporting. • Strong background in automated testing, particularly in the areas of performance, resilience, and stability. • Demonstrated experience delivering non‑functional test types such as load, stress, endurance, soak, resilience, and chaos testing. • Good understanding of software architecture, distributed systems, and modern infrastructure components. • Practical experience with at least one performance or test automation framework, e.g. JMeter, Gatling, or Spock. • Comfortable working with version control systems, preferably Git. • Experience executing non‑HTTP or non‑API performance tests, such as file‑based or protocol‑level testing. • Hands‑on knowledge of monitoring and observability solutions, including Grafana and Prometheus. • Ability to design and build custom testing tools or utilities when standard solutions are insufficient. • Fluent spoken and written English. Nice to have • Previous hands‑on experience working as a Software Developer or DevOps Engineer. • Experience with scripting languages such as Groovy or Linux shell. • Knowledge of CI/CD pipelines and build tooling, including Jenkins and Maven, as well as configuration and deployment tools like Kustomize or Helm. • Experience testing microservice‑based and distributed architectures. • Exposure to complex enterprise environments involving technologies such as container platforms, relational and NoSQL databases, messaging systems, in‑memory data grids, or hardware security modules. • Ability to analyze and troubleshoot JVM memory issues, including heap dumps, profiling, and performance tuning recommendations. • Understanding of database performance concepts, including execution plans and query optimization techniques. • Knowledge of networking fundamentals and communication protocols, such as SSL/TLS, HTTPS, TCP/IP, and gRPC. We offer • Ongoing support from a dedicated agent, taking care of your project continuity, client contact, necessary formalities, work comfort and development,  • Consultant Development Program – advice on growth planning based on the latest trends and market needs in IT, including consultations with agents and growth mentors,  • Access to 7N Learning & Development – a development and educational platform with webinars, a library of articles and industry reports, and regular invitations to one-time and recurring development events – technical, business, and lifestyle,  • Spectacular integration events, both for you (e.g., annual Kick-Off trip, Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g., family picnics, movie premieres),  • Professional development not only during the project – you can get involved in knowledge transfer to others within the 7N Services offering directed at 7N clients,  • Relationships and access to the knowledge of the most experienced IT experts in the market – the average professional tenure of our consultants in Poland is over 10 years,  • A complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad.