Performance Tester with Gatling (f/m/x)

Senior • Remote

1,000 - 1,200 PLN

Bialystok, Poland

We are looking for a Performance Engineer with Gatling for a project in the fueling & EV retail industry.

You’ll join a small but experienced team that supports various internal projects and helps teams build fast and stable systems. A big advantage is the well-structured testing strategy and ongoing collaboration with developers. You’ll work on solutions related to EV charging, loyalty systems, mobile applications, and retail — in an environment where performance and scalability truly matter.

Your tasks

Developing, maintaining, and deploying performance testing scripts, load generators, and executing performance tests
Defining performance testing scope, goals, and success criteria
Gathering and refining performance requirements with stakeholders
Analyzing performance results on both the client and server sides
Identifying bottlenecks using observability tools like Azure Application Insights, Amazon CloudWatch, and Grafana
Preparing clear reports with insights and recommendations
Supporting and guiding development teams on performance best practices while promoting a shift-left approach to performance testing
Helping define and improve performance engineering standards

Requirements

Minimum 5 years of professional experience in software testing, including performance testing
Solid understanding of performance engineering concepts and optimization (architectural patterns, databases, microservices, queues, JVM tuning)
Solid understanding of performance testing methodologies, strategies, and workload profiles
Hands-on experience with Gatling (must-have) and programming skills in Java, including a good understanding of OOP principles and best practices (SOLID, DRY, YAGNI, KISS)
Previous work with cloud platforms such as Azure or AWS
Practical experience with containerization and orchestration tools, especially Docker
Familiarity with observability and monitoring tools such as Grafana, Kibana, InfluxDB, Prometheus, Azure Application Insights, and Amazon CloudWatch
Experience working with CI/CD pipelines (e.g., GitHub Actions, Azure DevOps) and version control systems such as Git
English proficiency at a minimum B2 level
Fluent Polish required
Residing in Poland required

Nice-to-have requirements

Performance testing experience (JMeter, Python, Kubernetes), including mobile apps
Familiarity with GitHub Copilot

Sii

Sii is a company recognized as a "Great Place to Work" since 2015, thanks to employee feedback and the implementation of new ideas. Established in 2006, Sii has demonstrated financial stability with a revenue of 2.1 billion PLN and no debts. The company shares its profits with employees, having allocated over 76 million PLN for this purpose since 2022. Sii offers a rich benefits package, including private healthcare, a cafeteria platform, and discounts on cars. Employees can work in comfortable A-class offices or remotely. Sii is involved in numerous fascinating projects for prestigious global brands and invests 1 million PLN annually to support employee passions and volunteer actions. The company emphasizes personal development through meetups, webinars, a training platform, and a technology blog. Sii is characterized by a fantastic atmosphere created by its "Sii Power People."

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