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.