Software Engineer (Performance)​ (f/m)

🏢 Summary: The offer focuses on driving load and performance testing for a connected home IoT platform, ensuring scalability, reliability, and resilience of backend and web systems. The role involves designing, automating, and maintaining performance tests, analyzing bottlenecks, and improving system performance in collaboration with agile development teams. It also includes building and maintaining dedicated performance testing infrastructure and applying performance engineering and SRE practices. 🗂️ Requirements: 5+ years of experience in software engineering or performance engineering, Experience in load testing and system scaling, Experience with backend and web application scaling, Knowledge of messaging infrastructure and asynchronous IO, Experience with Infrastructure as Code, Experience with observability and monitoring tools, Understanding of SRE concepts, Experience with REST load testing tools, Experience working in agile methodologies, English proficiency 📃 Skills: Java, Scala, Go, Python, TypeScript, Terraform, Ansible, Prometheus, ELK, APM, REST, Jenkins, GitHub, Bitbucket, Confluence, Jira, SAFe, Scrum, Kanban 🏢 Description: As part of the development team, you will drive load and performance testing for connected home applications, designing, executing, and evaluating performance tests to ensure scalability, reliability, and resilience of the Home Connect IoT Platform. You will also contribute to the implementation and continuous improvement of services with a strong focus on performance engineering. Your responsibilities: Develop and conduct load and performance tests within an agile team as a core part of the Home Connect IoT Platform, in alignment with system architects and program management. Analyze performance bottlenecks and identify root causes across various system components. Evaluate existing and new components from a performance and reliability perspective. Create, enhance, and maintain automated load tests, reports, and dashboards. Develop and maintain the infrastructure of dedicated load and performance testing environments. Collaborate with dev teams in the continuous assessment and improvements of the Home Connect IoT platform's performance Expectations: 5+ years of experience in software engineering, performance engineering, or related areas. Strong willingness to continuously learn new technologies, tools, and engineering practices. Experience in load testing and scaling. Tech Stacks experience: Java; additional experience with Scala, Go, Python, or TypeScript is a plus Experience with scaling backends and web applications, messaging infrastructure, asynchronous IO, reactive programming, databases Infrastructure as Code (IaC), e.g., Terraform, Ansible. Observability tools (such as Prometheus, ELK, and APMs). REST load testing tools/frameworks Tools experience Confluence Jira Bitbucket/GitHub Jenkins/GitHub Actions Strong analytical skills: creating hypotheses, designing experiments to test them, defining and communicating metrics and chosen methods, presenting findings, and translating them into actionable improvements. Understanding of Site Reliability Engineering (SRE) concepts. Agile development practices, including SAFe, Scrum, Kanban, and Pair Programming. Excellent verbal and written communication skills in English; German language skills are a strong plus. We offer: Opportunities for continuous self-development in the latest technology stacks Participate in the concept creation and software architecture for new use cases in Home Connect Platform Stable employment in a professional work environment Private healthcare and sport package Flexible working hours with the possibility of remote work on selected days

🏢 Summary: The role focuses on driving load and performance testing for a connected home IoT platform, ensuring scalability, reliability, and resilience. You will design, execute, and automate performance tests, analyze bottlenecks, and improve system components within an agile environment. The position also involves maintaining testing infrastructure and collaborating with development teams to continuously enhance platform performance. 🗂️ Requirements: 5+ years experience in software or performance engineering, Proven experience in load testing and scaling systems, Experience with backend and web application scaling, Knowledge of messaging infrastructure and asynchronous processing, Experience with Infrastructure as Code, Experience with observability and monitoring tools, Understanding of SRE concepts, Experience working in Agile environments, Strong analytical and performance troubleshooting skills, Professional English proficiency 📃 Skills: Java, Scala, Go, Python, TypeScript, Terraform, Ansible, Prometheus, ELK, APM, REST, Jenkins, GitHub, Bitbucket, Confluence, Jira, Kafka, SQL 🏢 Description: Software Performance Engineer (f/m) As part of the development team, you will drive load and performance testing for connected home applications, designing, executing, and evaluating performance tests to ensure scalability, reliability, and resilience of the Home Connect IoT Platform. You will also contribute to the implementation and continuous improvement of services with a strong focus on performance engineering. Your responsibilities: Develop and conduct load and performance tests within an agile team as a core part of the Home Connect IoT Platform, in alignment with system architects and program management. Analyze performance bottlenecks and identify root causes across various system components. Evaluate existing and new components from a performance and reliability perspective. Create, enhance, and maintain automated load tests, reports, and dashboards. Develop and maintain the infrastructure of dedicated load and performance testing environments. Collaborate with dev teams in the continuous assessment and improvements of the Home Connect IoT platform's performance Expectations: 5+ years of experience in software engineering, performance engineering, or related areas. Strong willingness to continuously learn new technologies, tools, and engineering practices. Experience in load testing and scaling. Tech Stacks experience: Java; additional experience with Scala, Go, Python, or TypeScript is a plus Experience with scaling backends and web applications, messaging infrastructure, asynchronous IO, reactive programming, databases Infrastructure as Code (IaC), e.g., Terraform, Ansible. Observability tools (such as Prometheus, ELK, and APMs). REST load testing tools/frameworks Tools experience Confluence Jira Bitbucket/GitHub Jenkins/GitHub Actions Strong analytical skills: creating hypotheses, designing experiments to test them, defining and communicating metrics and chosen methods, presenting findings, and translating them into actionable improvements. Understanding of Site Reliability Engineering (SRE) concepts. Agile development practices, including SAFe, Scrum, Kanban, and Pair Programming. Excellent verbal and written communication skills in English; German language skills are a strong plus. We offer: Opportunities for continuous self-development in the latest technology stacks Participate in the concept creation and software architecture for new use cases in Home Connect Platform Stable employment in a professional work environment Private healthcare and sport package Flexible working hours with the possibility of remote work on selected days

🏢 Summary: Development of a microservices-based IoT platform focused on backend and full-stack solutions using a TypeScript stack. The role involves building and optimizing Node.js services, integrating REST APIs, contributing to infrastructure as code, and maintaining automated tests in a cloud environment. The position includes active participation in architectural decisions and AI-related engineering tasks. 🗂️ Requirements: 3+ years of experience with TypeScript, Strong experience with Node.js backend development, Experience with React, Experience with Terraform and infrastructure as code, Experience with RESTful APIs, Knowledge of microservices architecture, Experience with PostgreSQL, Experience with MongoDB, Experience with GitHub and pull requests, Experience with AWS cloud services, Experience with unit and integration testing, Hands-on experience in AI software engineering 📃 Skills: TypeScript, Node.js, React, Terraform, REST, Microservices, PostgreSQL, MongoDB, GitHub, AWS, UnitTesting, IntegrationTesting, AI 🏢 Description: Your responsibilities Participate in further development of microservices-oriented architecture in the context of Home Connect IoT-Platform. Participate in the selection of proper and well-suited technologies for the project (your voice matters). Continuously work on optimizing the code to achieve a solid software architecture. Collaborate with team by focusing on delivering value for users. Create, enhance and maintain automated Unit- and Integration tests. Analyze software problems and work on bug fixes. Your profile 3+ years of experience in software development focused on TypeScript tech-stack (as backend- or full stack-developer). Extensive experience in building backend applications with Node.js. Experience with building front-end solutions - React. Experience with "infrastructure as a code" tools (Terraform) Extensive experience working with RESTful APIs and integrating with complex backend systems. Understanding of microservice architecture and ability to implement its best practices. Experience in working with relational databases (PostgreSQL) and NoSQL databases (MongoDB). Managing code repositories (like Github), handling Pull Requests, collaborating on code versions. Experience in working with cloud solutions (AWS). Know-how of methods and tools for automated testing (Unit-/UI-Testing). Agile development, supported by practices (Scrum, Kanban) and related tools. Comfortable in working with English - verbal and written communication skills. Open to work on tasks not directly about coding new features, such as research, testing, feedback the UX design etc. Proactive posture – active in finding topics to work on, willingness to find and work on improvements. Focused on user value. Team player and open for effective remote cooperation (distributed team). AI : Hands-on interest & experience in AI SW Engineering Nice to have: Experience in smart home solutions. Experience in event-driven architecture - Apache Kafka or similar. Knowledge of CI/CD (especially Artifactory, Jenkins), project management tools (Confluence, JIRA) Strong communication skills including ability to present results in front of a bigger audience (sprint review, system demo). German would be a plus. Your benefits Dynamic International Environment: Collaborate with diverse teams globally, enriching your experience and expanding your professional network Collaborative Team Culture: Join a supportive team that values your contributions and encourages your growth Professional Development Opportunities: Expand your skills through engaging projects and responsibilities that challenge and inspire you Flexible hybrid work arrangements: Enjoy a mix of remote work and office collaboration, with a minimum of one day per week in our modern offices Comprehensive Benefits Package: Enjoy private health care, a Lunchpass card, a sports card, group insurance options and employee discounts

🏢 Summary: Development of a microservices-based IoT platform (Home Connect) using a TypeScript stack, focused on backend and full-stack features, cloud infrastructure, and code quality. The role involves building and optimizing Node.js services, integrating complex systems, and contributing to architecture and technology decisions. Strong emphasis on automated testing, cloud deployment, and scalable microservice design. 🗂️ Requirements: 3+ years TypeScript development experience, Strong Node.js backend development experience, Experience with React, Experience with Terraform (Infrastructure as Code), Experience with RESTful APIs, Knowledge of microservices architecture, Experience with PostgreSQL, Experience with MongoDB, Experience with AWS, Experience with automated testing (Unit, Integration, UI), Experience with Git and Pull Requests, Experience working in Agile (Scrum or Kanban), English proficiency (written and spoken) 📃 Skills: TypeScript, Node.js, React, Terraform, REST, Microservices, PostgreSQL, MongoDB, AWS, Git, JUnit, Jest, CI/CD, Jenkins, Artifactory, Kafka, Docker, AI 🏢 Description: Your responsibilities Participate in further development of microservices-oriented architecture in the context of Home Connect IoT-Platform. Participate in the selection of proper and well-suited technologies for the project (your voice matters). Continuously work on optimizing the code to achieve a solid software architecture. Collaborate with team by focusing on delivering value for users. Create, enhance and maintain automated Unit- and Integration tests. Analyze software problems and work on bug fixes. Your profile 3+ years of experience in software development focused on TypeScript tech-stack (as backend- or full stack-developer). Extensive experience in building backend applications with Node.js. Experience with building front-end solutions - React. Experience with "infrastructure as a code" tools (Terraform) Extensive experience working with RESTful APIs and integrating with complex backend systems. Understanding of microservice architecture and ability to implement its best practices. Experience in working with relational databases (PostgreSQL) and NoSQL databases (MongoDB). Managing code repositories (like Github), handling Pull Requests, collaborating on code versions. Experience in working with cloud solutions (AWS). Know-how of methods and tools for automated testing (Unit-/UI-Testing). Agile development, supported by practices (Scrum, Kanban) and related tools. Comfortable in working with English - verbal and written communication skills. Open to work on tasks not directly about coding new features, such as research, testing, feedback the UX design etc. Proactive posture – active in finding topics to work on, willingness to find and work on improvements. Focused on user value. Team player and open for effective remote cooperation (distributed team). AI : Hands-on interest & experience in AI SW Engineering Nice to have: Experience in smart home solutions. Experience in event-driven architecture - Apache Kafka or similar. Knowledge of CI/CD (especially Artifactory, Jenkins), project management tools (Confluence, JIRA) Strong communication skills including ability to present results in front of a bigger audience (sprint review, system demo). German would be a plus. Your benefits Dynamic International Environment: Collaborate with diverse teams globally, enriching your experience and expanding your professional network Collaborative Team Culture: Join a supportive team that values your contributions and encourages your growth Professional Development Opportunities: Expand your skills through engaging projects and responsibilities that challenge and inspire you Flexible hybrid work arrangements: Enjoy a mix of remote work and office collaboration, with a minimum of one day per week in our modern offices Comprehensive Benefits Package: Enjoy private health care, a Lunchpass card, a sports card, group insurance options and employee discounts

🏢 Summary: Senior Engineer role focused on architecting and building a scalable, event-driven IoT platform, bridging high-concurrency backend systems with high-performance web applications. The position involves designing microservices, real-time streaming pipelines, robust APIs, and responsive React-based frontends to support millions of IoT events globally. Strong emphasis on system reliability, testing excellence, and low-latency distributed architecture. 🗂️ Requirements: 5+ years of software engineering experience, Deep expertise in Node.js and TypeScript, Strong knowledge of Event-Driven Architecture, Experience with asynchronous programming patterns, Proven experience designing and maintaining complex, versioned APIs, Expert-level proficiency in React and Next.js, Experience with Unit, Integration, and E2E testing, Experience with NoSQL and SQL databases, Experience with search engines such as OpenSearch or Elasticsearch, Professional-level English 📃 Skills: Node.js, TypeScript, Kafka, RabbitMQ, React, Next.js, Jest, Vitest, Playwright, NoSQL, SQL, OpenSearch, Elasticsearch, Python, Microservices, APIs 🏢 Description: Your responsibilities Join the Home Connect team to architect the core of our global IoT ecosystem. We are looking for a Senior Engineer who can bridge the gap between high-concurrency distributed systems and intuitive, high-performance user-facing web applications. You will play a pivotal role in designing the backbone of our platform - ensuring that millions of real-time IoT events translate into a seamless, reliable experience for our users. System Architecture: Design and implement scalable microservices using Node.js and TypeScript. You’ll be responsible for the "heavy lifting" - ensuring high availability and low latency across a global infrastructure. Backend & Streaming: Master our Event-Driven Architecture . You will build and optimize asynchronous workflows using Kafka/RabbitMQ to handle massive data streams from IoT sensors with precision. API Leadership: Take full ownership of API Design . You’ll create the high-performance, type-safe contracts that connect our hardware, cloud services, and frontend applications. Frontend Mastery: Build sophisticated, responsive web applications using React and Next.js . You’ll focus on state management and performance to ensure the UI feels instantaneous, even when dealing with complex backend states. Testing & Reliability: Drive a "zero-regression" culture. You will design and implement comprehensive testing strategies—covering Unit, Integration, and E2E (Jest, Vitest, Playwright) —to ensure our system remains rock-solid Your profile Experience: 5+ years in software engineering, with deep expertise in Node.js and TypeScript . Backend & Messaging: Strong command of Event-Driven Architecture and advanced asynchronous programming patterns. API Design Mastery: Proven ability to design and maintain complex, versioned APIs and move toward contract-driven development . Frontend Proficiency: Expert-level React and Next.js , with a deep understanding of browser performance and modern state management. Testing Excellence: A "test-first" mindset with hands-on experience in building resilient testing suites (Unit, Integration, E2E). Data & Search: Solid experience with NoSQL/SQL databases and search engines like OpenSearch or Elasticsearch . AI & Python (Nice to Have): Hands-on interest in AI development, Vector Databases , or building microservices with Python . Communication: Professional-level English and the ability to mentor engineers on complex architectural trade-offs. Your benefits If you are passionate about delivering high-quality, user-centric applications and have a strong background in TypeScript, React, and Node.js, we would love to hear from. you. Join us in creating the next generation of connected home experiences. Contribute to the architectural design of innovative use cases within the Home Connect ecosystem, with a particular focus on guided cooking, while seamlessly incorporating the latest technological advancements. Engaged community of developers and knowledge sharing events (e.g. Techdays). Stable employment in a professional and collaborative work environment. Flexible working hours, with the option for remote work on selected days. Comprehensive benefits package, including private health care, Lunchpass card, sport card, group insurance options, and fresh fruit offerings.

🏢 Summary: Senior Engineer role focused on architecting and developing a scalable IoT platform, combining high-concurrency backend systems with high-performance web applications. The position involves designing microservices, event-driven architectures, and type-safe APIs while ensuring seamless integration between IoT devices, cloud services, and frontend applications. The role also emphasizes comprehensive testing and system reliability across a global infrastructure. 🗂️ Requirements: 5+ years of experience in software engineering, Strong expertise in Node.js and TypeScript, Experience with Event-Driven Architecture, Advanced asynchronous programming skills, Proven experience designing and maintaining versioned APIs, Expert-level knowledge of React and Next.js, Experience with Unit, Integration, and E2E testing, Experience with SQL and NoSQL databases, Experience with search engines such as OpenSearch or Elasticsearch, Professional-level English 📃 Skills: Node.js, TypeScript, React, Next.js, Kafka, RabbitMQ, Jest, Vitest, Playwright, SQL, NoSQL, OpenSearch, Elasticsearch, Python, AI 🏢 Description: Join the Home Connect team to architect the core of our global IoT ecosystem. We are looking for a Senior Engineer who can bridge the gap between high-concurrency distributed systems and intuitive, high-performance user-facing web applications. You will play a pivotal role in designing the backbone of our platform - ensuring that millions of real-time IoT events translate into a seamless, reliable experience for our users. System Architecture: Design and implement scalable microservices using Node.js and TypeScript. You’ll be responsible for the "heavy lifting" - ensuring high availability and low latency across a global infrastructure. Backend & Streaming: Master our Event-Driven Architecture . You will build and optimize asynchronous workflows using Kafka/RabbitMQ to handle massive data streams from IoT sensors with precision. API Leadership: Take full ownership of API Design . You’ll create the high-performance, type-safe contracts that connect our hardware, cloud services, and frontend applications. Frontend Mastery: Build sophisticated, responsive web applications using React and Next.js . You’ll focus on state management and performance to ensure the UI feels instantaneous, even when dealing with complex backend states. Testing & Reliability: Drive a "zero-regression" culture. You will design and implement comprehensive testing strategies—covering Unit, Integration, and E2E (Jest, Vitest, Playwright) —to ensure our system remains rock-solid Wymagania: Experience: 5+ years in software engineering, with deep expertise in Node.js and TypeScript . Backend & Messaging: Strong command of Event-Driven Architecture and advanced asynchronous programming patterns. API Design Mastery: Proven ability to design and maintain complex, versioned APIs and move toward contract-driven development . Frontend Proficiency: Expert-level React and Next.js , with a deep understanding of browser performance and modern state management. Testing Excellence: A "test-first" mindset with hands-on experience in building resilient testing suites (Unit, Integration, E2E). Data & Search: Solid experience with NoSQL/SQL databases and search engines like OpenSearch or Elasticsearch . AI & Python (Nice to Have): Hands-on interest in AI development, Vector Databases , or building microservices with Python . Communication: Professional-level English and the ability to mentor engineers on complex architectural trade-offs. Oferujemy: If you are passionate about delivering high-quality, user-centric applications and have a strong background in TypeScript, React, and Node.js, we would love to hear from. you. Join us in creating the next generation of connected home experiences. Contribute to the architectural design of innovative use cases within the Home Connect ecosystem, with a particular focus on guided cooking, while seamlessly incorporating the latest technological advancements. Engaged community of developers and knowledge sharing events (e.g. Techdays). Stable employment in a professional and collaborative work environment. Flexible working hours, with the option for remote work on selected days. Comprehensive benefits package, including private health care, Lunchpass card, sport card, group insurance options, and fresh fruit offerings.

🏢 Summary: Senior Performance Test Engineer role focused on building and integrating performance testing practices for digital fleet management platforms in an Agile environment. The position involves designing automated performance test strategies, analyzing system scalability and reliability, and embedding performance testing into CI/CD pipelines. Hybrid work model based in Warsaw. 🗂️ Requirements: 5+ years of experience in performance engineering or testing, Experience with LoadRunner, Experience with Apache JMeter, Experience with Gatling, Knowledge of performance testing methodologies, Knowledge of workload modeling, Knowledge of capacity planning, Experience analyzing application logs and system metrics, Experience identifying performance bottlenecks, Experience with Dynatrace, Experience with Elasticsearch, Experience integrating performance testing into CI/CD pipelines, Fluent Polish, Fluent English 📃 Skills: LoadRunner, JMeter, Gatling, Dynatrace, Elasticsearch, Grafana, Prometheus, CI/CD, APM, Agile 🏢 Description: We are looking for an experienced Senior Performance Test Engineer to join a dynamic Agile team responsible for developing and supporting digital fleet management platforms used across multiple countries. In this role you will ensure the scalability, reliability, and efficiency of digital platforms throughout the entire software delivery lifecycle. You will collaborate closely with Product Teams, Cloud Engineering, and QA communities to embed performance best practices into delivery teams and support the industrialization and standardization of performance testing across the organization. The role is based in Warsaw and offers a hybrid working model. Your tasks - Designing and implementing performance testing strategies aligned with product architecture - Integrating performance testing into CI/CD pipelines to enhance delivery efficiency - Defining performance acceptance criteria and non-functional requirements (NFRs) - Developing and maintaining automated load, stress, endurance, and scalability test scenarios - Analyzing application and infrastructure behavior under load to identify performance bottlenecks - Collaborating with engineering teams to improve system scalability, resilience, and overall performance - Defining, measuring, and monitoring key performance indicators (KPIs), including latency, throughput, response times, and resource utilization - Partnering with Operations and Site Reliability Engineering (SRE) teams to validate system stability and production readiness - Developing reusable test assets, datasets, CI/CD pipelines, and automation templates Requirements - Minimum 5 years of experience in performance engineering or testing - Hands-on experience with performance testing tools such as LoadRunner, Apache JMeter, and Gatling - Strong understanding of performance testing methodologies, workload modeling, and capacity planning - Experience analyzing application logs, system metrics, and identifying performance bottlenecks - Familiarity with application performance monitoring (APM) tools such as Dynatrace and Elasticsearch - Experience integrating performance testing into CI/CD pipelines is a strong advantage - Fluent Polish and English Nice-to-have requirements - Familiarity with Grafana and Prometheus

🏢 Summary: Remote (later hybrid in Warsaw) Senior Load Test Engineer role focused on designing, executing, and automating performance testing for large-scale production systems. The position involves identifying bottlenecks, analyzing metrics, and integrating load tests into CI/CD pipelines to ensure platform stability and scalability. You will work closely with backend teams to maintain high performance under heavy user traffic. 🗂️ Requirements: 5+ years performance and load testing experience, Experience with large production systems, Proficiency with k6, Gatling, JMeter, or Locust, Ability to create complex load testing scripts from scratch, Strong understanding of backend systems and databases, Knowledge of infrastructure behavior under heavy load, Ability to analyze metrics from monitoring tools, Knowledge of HTTP, WebSockets, real-time protocols, Experience testing APIs under load, Experience with CI/CD pipeline integration, Proficiency with Git 📃 Skills: k6, Gatling, JMeter, Locust, Grafana, Datadog, NewRelic, HTTP, WebSockets, CI/CD, Git, APIs, Databases 🏢 Description: Please note: Remote mode but later hybrid in Warsaw Position Overview We are looking for a Senior Load Test Engineer who is passionate about performance testing. You understand how systems work when many users use them at the same time. You know how to find problems before real users experience them. You can clearly explain what is wrong and why it needs to be fixed. You work independently, manage your testing process from start to finish, and care about keeping our platform fast and stable as it grows. Key Responsibilities Plan and run load, stress, spike, and long-running tests on important parts of our platform. Study the results and find exactly where and why performance becomes worse. Work closely with backend engineers to understand the system and identify the real bottlenecks. Create and maintain performance test scripts that can be reused, stored in version control, and easily updated when the product changes. Add performance tests to CI/CD pipelines so problems can be detected early. Set performance goals and limits together with engineering and product teams. Watch how the platform behaves under load using monitoring tools and connect metrics with test results. Write clear reports and give practical recommendations to engineering teams. Qualifications 5+ years of practical experience with performance and load testing for large production systems. Strong experience with tools such as k6, Gatling, JMeter, or Locust, including creating complex scripts from the beginning. Good understanding of backend systems, databases, and how infrastructure behaves under heavy load. Ability to read and understand metrics from tools like Grafana, Datadog, New Relic, or similar. Good knowledge of HTTP, WebSockets, and real-time communication protocols. Experience testing APIs under load, including authentication flows, many users at the same time, and stateful scenarios. Familiar with CI/CD pipelines and adding performance tests to automated build processes. Comfortable using Git and working in agile engineering teams. Soft Skills Naturally curious — you like to understand why a system behaves in a certain way under pressure. Strong analytical thinking — you can review many metrics and quickly find the most important problem. Good communication — you can explain complex performance issues clearly to both developers and product managers. Self-motivated — you do not wait for someone to tell you there is a problem; you actively look for it.

🏢 Summary: Performance Engineer role focused on designing and executing performance testing for EV charging, retail, and mobile solutions in a cloud-based environment. The position involves building and maintaining Gatling test scripts, analyzing system performance, and optimizing scalability in collaboration with development teams. You will drive performance engineering standards and support a shift-left approach to ensure fast and stable systems. 🗂️ Requirements: Minimum 5 years of experience in software testing including performance testing, Hands-on experience with Gatling, Strong programming skills in Java, Understanding of OOP principles and SOLID, DRY, YAGNI, KISS practices, Knowledge of performance engineering concepts and optimization (architectural patterns, databases, microservices, queues, JVM tuning), Experience with performance testing methodologies and workload modeling, Experience with Azure or AWS cloud platforms, Practical experience with Docker, Experience with observability and monitoring tools, Experience with CI/CD pipelines, Experience with Git version control, English proficiency at B2 level minimum, Fluent Polish, Residing in Poland 📃 Skills: Gatling, Java, Azure, AWS, Docker, Grafana, Kibana, InfluxDB, Prometheus, CloudWatch, ApplicationInsights, GitHub, Actions, AzureDevOps, Git, JVM, OOP, SOLID, DRY, YAGNI, KISS, Microservices, Databases, Queues, CI/CD 🏢 Description: 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!

🏢 Summary: The offer is for a software engineer role focused on designing and optimizing high-performance, low-latency systems handling over 24 million queries per second. The position involves building scalable and reliable distributed components, improving performance, and developing monitoring and testing tools in a production environment. The role emphasizes high availability, scalability, and working with modern cloud and data technologies. 🗂️ Requirements: Proficiency in programming, Strong understanding of complex IT systems from hardware to algorithms, Knowledge of Internet protocols (DNS, HTTP, cookies), Knowledge of concurrent programming and distributed systems, Experience with monitoring and analyzing production systems, Ability to optimize system performance and resolve performance issues, Knowledge of high scalability and high availability concepts, C1 level English, C1 level Polish 📃 Skills: Java, Python, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite, DNS, HTTP 🏢 Description: You Will: Design and programming of a wide range of modules and components as part of a system that supports over 24M queries per second and low latency. Work on the optimization of the developed software in terms of response time and resource consumption Ensure the reliability and scalability of the solutions built Create performance and correctness tests for new system components Analyse new technologies in terms of their applicability in production conditions Develop tools for monitoring and analysing the operation of the production system Continuous optimization of existing tools and processes Desired Experience: Proficiency in programming Excellent understanding of how complex IT systems work (from the hardware level, through software, to algorithmics) Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others) Good knowledge of basic methods of creating concurrent programs and distributed systems (from thread level to continent level) Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it) The ability to critically analyze the solutions created in terms of performance (from estimating the theoretical performance of the designed systems to detecting and removing actual performance problems in production) General knowledge of issues (typical problems and methods of solving them) in the areas of 'high scalability' and 'high availability' C1 level in English and Polish Selected Technologies: Java, Python Aerospike, Memcached Google Cloud Platform, BigQuery, MinIO Kafka, Clickhouse PostgreSQL Elasticsearch Kubernetes, Prometheus Jenkins, Graphite We Offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow. Apply now! You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.