Performance Tester with Gatling (f/m/x)

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

What we offer 

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas 

• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market 

• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 

• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more 

• Comfortable workplace – class A offices or remote work 

• Dozens of fascinating projects for prestigious brands from all over the world 

• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers 

• Investment in your growth – meetups, webinars, training platform and technology blog – you choose 

• Fantastic atmosphere created by all Sii Power People 

If you want to work on systems with high operational significance — apply now!