Quality Assurance Engineer

🏢 Summary: Senior-level role focused on designing and leading high-performance, scalable frontend and full-stack solutions for global ad delivery and tracking systems. The position emphasizes web performance optimization, observability (RUM and Synthetic), and architectural excellence across performance-critical features. You will drive measurable improvements in user metrics while maintaining top coding standards and technical leadership. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong understanding of frontend development and internal mechanisms, Proven experience in web performance optimization and advanced loading strategies, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks (React), Experience with build tools (Webpack or Vite), Knowledge of Internet protocols and technologies (DNS, HTTP, cookies), Experience monitoring and analyzing production systems, Understanding of full-stack concepts and backend APIs (Node.js, Python, or Java), Experience with deployment and CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, Cookies, RUM, Synthetic, CICD, Caching, Monitoring 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: Lead the design and implementation of high-performance, scalable frontend and full-stack solutions for globally distributed ad systems, with a strong focus on web performance and observability. The role involves optimizing critical user metrics, building monitoring systems, and ensuring robust architecture and code quality across performance-sensitive features. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong expertise in frontend development and internal browser mechanisms, Proven experience in web performance optimization and advanced loading strategies, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks such as React, Experience with build tools such as Webpack or Vite, Solid understanding of Internet protocols including DNS and HTTP, Ability to monitor, analyze, and diagnose production system performance, Understanding of full-stack concepts and backend API integration, Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, RUM, CICD, Caching 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: Senior engineer role focused on designing and implementing high‑performance, scalable frontend and full‑stack solutions for global ad delivery systems. The position emphasizes web performance optimization, observability, and monitoring (RUM and Synthetic) to improve critical user metrics. You will lead technical initiatives, build performance‑critical features, and ensure high code quality across JavaScript/TypeScript-based systems. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong understanding of frontend development and internal browser mechanisms, Practical experience with web performance optimization techniques, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks (React), Experience with build tools (Webpack or Vite), Knowledge of Internet protocols (DNS, HTTP, cookies), Experience monitoring and analyzing production systems, Understanding of full-stack architecture and backend APIs (Node.js, Python, or Java), Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, cookies, CI/CD, RUM, Synthetic, caching, observability, APIs 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: QA Engineer role focused on automated and manual testing in a Scrum environment, with strong emphasis on Java-based test automation, CI/CD integration, and quality assurance processes. The position involves building and maintaining UI and API automation frameworks, executing functional and exploratory testing, and collaborating closely with development and DevOps teams. The offer includes on-site work in Warsaw and benefits such as private healthcare, insurance, and an e-learning platform. 🗂️ Requirements: 5+ years of experience as QA Engineer or Test Automation Engineer, Strong hands-on experience with Java, Experience with Playwright and Selenium, Experience with RestAssured and Postman/Newman, Experience with CI/CD tools, Ability to design test cases, Experience with Jira and Xray/Zephyr, Proficiency with Git, Understanding of testing methodologies, Knowledge of ISTQB Foundation principles 📃 Skills: Java, Playwright, Selenium, RestAssured, Postman, Newman, GitLab, GitHub, Azure, Jenkins, Jira, Xray, Zephyr, Git, ISTQB, Python, C#, JavaScript, TypeScript, Docker, Kubernetes, AWS, GCP, Cucumber 🏢 Description: Location: Warsaw – 100% on-site Responsibilities: Automated Testing •    Design, implement, and maintain automated tests (UI, API, regression, integration). •    Develop and enhance automation frameworks following best practices. •    Integrate automated tests into CI/CD pipelines and monitor their stability. •    Analyze test results, identify issues, and report defects. •    Collaborate closely with Development, DevOps, and Product Owners. •    Optimize test execution time, reliability, and coverage. Manual Testing •    Design and execute functional and exploratory tests. •    Create and maintain test cases based on user requirements and acceptance criteria. •    Validate features delivered in each sprint. •    Support end-to-end (E2E), UAT, and ad hoc testing activities. Working in a Scrum Team •    Participate in Agile ceremonies: daily stand-ups, refinements, sprint planning, reviews, and retrospectives. •    Contribute to sprint-level testing and quality planning. •    Co-define and maintain Definition of Done (DoD) and Definition of Ready (DoR) from a QA perspective. •    Identify quality risks and propose mitigation strategies. Requirements Technical Skills •    Minimum 5 years of experience as a QA Engineer or Test Automation Engineer. •    Strong hands-on experience with Java. •    Experience with automation tools/frameworks: o    UI: Playwright, Selenium o    API: RestAssured, Postman/Newman •    Experience working with CI/CD tools (GitLab CI, GitHub Actions, Azure DevOps, Jenkins). •    Ability to design test cases and work with test management tools (e.g., Jira + Xray/Zephyr). •    Proficiency with Git version control. •    Solid understanding of testing methodologies and ISTQB Foundation principles (certification is a plus). Nice to Have •    Knowledge of additional languages: Python, C#, JavaScript/TypeScript. •    Experience in performance testing. •    Familiarity with Docker/Kubernetes and containerized test environments. •    Experience with cloud platforms (Azure, AWS, GCP). •    Exposure to modern QA practices: o    Shift-left testing o    Contract testing o    BDD (e.g., Cucumber) Our offer: •    MultiSport Plus •    Group insurance •    Medicover Premium •    e-learning platform

🏢 Summary: The role is for a Senior QA/Test Automation Engineer responsible for designing and maintaining automated and manual tests within a Scrum team, fully on-site in Warsaw. The position focuses on building automation frameworks, integrating tests into CI/CD pipelines, and ensuring high product quality across UI and API layers. The engineer collaborates closely with development and DevOps teams while contributing to Agile quality processes. 🗂️ Requirements: Minimum 5 years of experience as QA Engineer or Test Automation Engineer, Strong hands-on experience with Java, Experience with UI automation tools: Playwright or Selenium, Experience with API automation tools: RestAssured or Postman/Newman, Experience with CI/CD tools: GitLab CI, GitHub Actions, Azure DevOps or Jenkins, Ability to design test cases and use test management tools such as Jira with Xray or Zephyr, Proficiency with Git version control, Solid understanding of testing methodologies and ISTQB Foundation principles 📃 Skills: Java, Playwright, Selenium, RestAssured, Postman, Newman, GitLab, GitHub, Azure, Jenkins, Jira, Xray, Zephyr, Git, ISTQB 🏢 Description: Location: Warsaw – 100% on-site Responsibilities: Automated Testing •    Design, implement, and maintain automated tests (UI, API, regression, integration). •    Develop and enhance automation frameworks following best practices. •    Integrate automated tests into CI/CD pipelines and monitor their stability. •    Analyze test results, identify issues, and report defects. •    Collaborate closely with Development, DevOps, and Product Owners. •    Optimize test execution time, reliability, and coverage. Manual Testing •    Design and execute functional and exploratory tests. •    Create and maintain test cases based on user requirements and acceptance criteria. •    Validate features delivered in each sprint. •    Support end-to-end (E2E), UAT, and ad hoc testing activities. Working in a Scrum Team •    Participate in Agile ceremonies: daily stand-ups, refinements, sprint planning, reviews, and retrospectives. •    Contribute to sprint-level testing and quality planning. •    Co-define and maintain Definition of Done (DoD) and Definition of Ready (DoR) from a QA perspective. •    Identify quality risks and propose mitigation strategies. Requirements Technical Skills •    Minimum 5 years of experience as a QA Engineer or Test Automation Engineer. •    Strong hands-on experience with Java. •    Experience with automation tools/frameworks: o    UI: Playwright, Selenium o    API: RestAssured, Postman/Newman •    Experience working with CI/CD tools (GitLab CI, GitHub Actions, Azure DevOps, Jenkins). •    Ability to design test cases and work with test management tools (e.g., Jira + Xray/Zephyr). •    Proficiency with Git version control. •    Solid understanding of testing methodologies and ISTQB Foundation principles (certification is a plus). Nice to Have •    Knowledge of additional languages: Python, C#, JavaScript/TypeScript. •    Experience in performance testing. •    Familiarity with Docker/Kubernetes and containerized test environments. •    Experience with cloud platforms (Azure, AWS, GCP). •    Exposure to modern QA practices: o    Shift-left testing o    Contract testing o    BDD (e.g., Cucumber) Our offer: •    MultiSport Plus •    Group insurance •    Medicover Premium •    e-learning platform

🏢 Summary: The offer is for a senior DevOps/Cloud Engineer to lead and support enterprise cloud migration initiatives in Azure, focusing on CI/CD automation, infrastructure as code, and secure, scalable cloud environments. The role involves managing Azure-based platforms, optimizing performance and security, and collaborating with cross-functional teams to modernize and support business-critical systems. It also includes working with hybrid cloud environments and leveraging AI-powered tools to enhance software delivery processes. 🗂️ Requirements: 5+ years in DevOps, Cloud Engineering, or Platform Engineering, Strong hands-on experience with Microsoft Azure in production environments, Experience building and maintaining Azure DevOps CI/CD pipelines (YAML), Hands-on experience with Azure App Services, WebJobs, and Azure Functions, Knowledge of Azure API Management, Application Gateway, and WAF, Experience with Terraform and Infrastructure as Code practices, Understanding of .NET application hosting environments (.NET 4.8–.NET 8+), Experience with hybrid or multi-cloud environments (Azure and AWS), Experience with secrets management and identity solutions, Experience in enterprise migration or modernization programs, English proficiency minimum B2, Work permit and residence in the European Union 📃 Skills: Azure, AzureDevOps, CI/CD, YAML, Terraform, .NET, APIM, WAF, AppServices, WebJobs, AzureFunctions, ApplicationGateway, KeyVault, ManagedIdentity, AWS, IaC 🏢 Description: 🟣 You will be: supporting and driving cloud migration initiatives across business-critical systems, designing, building, and maintaining CI/CD pipelines in Azure DevOps, managing and optimizing Azure-based infrastructure and application environments, automating infrastructure provisioning and configuration using Infrastructure as Code practices, collaborating with development and architecture teams to ensure reliable and scalable deployments, improving platform security, performance, and operational efficiency, supporting application services and cloud-native solutions throughout the software delivery lifecycle. 🟣 Your profile: 5+ years of experience in DevOps, Cloud Engineering, or Platform Engineering roles, strong hands-on experience with Microsoft Azure, including production-grade environments, proven experience building and maintaining Azure DevOps CI/CD pipelines (YAML-based), hands-on experience with Azure App Services, WebJobs, and Azure Functions, strong knowledge of Azure API Management (APIM), Application Gateway, and WAF, experience with Terraform (azurerm provider) and Infrastructure as Code practices, understanding of .NET-based application hosting environments (.NET 4.8–.NET 8+), experience working with hybrid or multi-cloud environments (Azure + AWS), familiarity with secrets management and identity solutions (Key Vault, Managed Identity), experience working in enterprise migration or modernisation programmes, strong analytical, troubleshooting, and problem-solving skills, good communication skills and ability to work in cross-functional teams, good command of English (min. B2), practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery. 🟣 Nice to have: experience with AWS migration programmes (e.g. MAP or similar initiatives), familiarity with React, Node.js, or EventStoreDB in hybrid architectures, exposure to FinOps practices and cloud cost optimisation initiatives, experience integrating AI tools into engineering workflows (CI/CD, IaC, automation), experience with enterprise-scale policy governance (Azure Policy, guardrails), experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work, interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. Work from the European Union region and a work permit are required 🟣 Recruitment Process: CV review – HR Interview – Technical Interview - Client Interview – Decision 🎁 Benefits 🎁 ✍ Development: development budgets of up to 6,800 PLN, we fund certifications e.g.: AWS, Azure, access to Udemy, O'Reilly (formerly Safari Books Online) and more, events and technology conferences, technology Guilds, internal training, Xebia Upskill. 🩺 We take care of your health: private medical healthcare, multiSport card - we subsidise a MultiSport card, mental Health Support. 🤸‍♂️ We are flexible: B2B or employment contract, contract for an indefinite period.

🏢 Summary: Design and lead the implementation of high-performance, scalable and observable systems for global ad serving and tracking. The role focuses on building and optimizing HTTP/gRPC services and batch jobs in Java and Python, ensuring production reliability and measurable performance improvements. You will provide hands-on technical leadership while maintaining high engineering and code quality standards. 🗂️ Requirements: Strong knowledge of Java and Python, Experience building and maintaining HTTP and gRPC services, Experience with batch processing systems, Understanding of distributed systems and concurrency, Knowledge of Internet protocols (DNS, HTTP, cookies), Ability to design for high scalability and high availability, Experience monitoring and analyzing production systems, Ability to optimize system performance at scale, Experience deploying and maintaining production environments, Understanding of complex systems from hardware to algorithms 📃 Skills: Java, Python, HTTP, gRPC, DNS, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite, Concurrency, DistributedSystems, Scalability, Availability, Monitoring, Performance 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement, test, deploy, monitor and maintain (in all aspects, including setting up environment, writing configuration code, monitor production) HTTP / gRPC services and batch jobs in Java and Python, ensuring adherence to the high engineering standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Desired experience: Excellent understanding of how complex IT systems work - from the hardware level, through software, to algorithms. 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 geo-distributed clusters 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. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: 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 – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering, send us your CV, and we'll review it.

🏢 Summary: Design and lead the implementation of highly scalable, high‑performance ad serving and tracking systems, building and optimizing HTTP/gRPC services and batch jobs in Java and Python. The role combines hands-on development with technical leadership, focusing on observability, reliability, and measurable performance improvements in distributed production environments. You will work on globally distributed systems handling large-scale traffic with strong engineering and code quality standards. 🗂️ Requirements: Experience designing and implementing high-performance, scalable distributed systems, Strong knowledge of Java and Python, Experience building and maintaining HTTP and gRPC services, Understanding of Internet protocols (DNS, HTTP, cookies), Knowledge of concurrency and distributed systems concepts, Ability to monitor, analyze and optimize production systems, Experience with high scalability and high availability architectures, Fluent English and Polish (C1) 📃 Skills: Java, Python, HTTP, gRPC, DNS, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement, test, deploy, monitor and maintain (in all aspects, including setting up environment, writing configuration code, monitor production) HTTP / gRPC services and batch jobs in Java and Python, ensuring adherence to the high engineering standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Desired experience: Excellent understanding of how complex IT systems work - from the hardware level, through software, to algorithms. 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 geo-distributed clusters 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. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: 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 – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering, send us your CV, and we'll review it.

🏢 Summary: Senior Fullstack Engineer role focused on designing and building scalable digital products in cross-functional teams, combining frontend (React/Vue/Angular) and backend (Node.js/Python) development. The position involves microservices architecture, API-driven solutions, CI/CD automation, cloud environments, and high standards of quality, security, and accessibility. Strong impact on technical decisions, architecture, and engineering practices is expected. 🗂️ Requirements: Minimum 8 years of experience in application development, Strong knowledge of JavaScript and TypeScript, Commercial experience with Node.js and/or Python, Experience with modern frontend framework: React, Vue or Angular, Knowledge of component-based architecture and state management (Redux, Zustand or Vuex), Experience with REST and GraphQL APIs, Experience with microservices architecture, Knowledge of build tools (Vite, Webpack, Babel), Experience with CI/CD tools (GitHub Actions, GitLab, Azure DevOps), Experience with automated testing (unit, integration, e2e), Understanding of WCAG, security, observability and performance principles, Experience with cloud platforms (AWS, Azure or GCP), Experience with Salesforce, Experience in technical mentoring and driving technical decisions, Fluent English 📃 Skills: JavaScript, TypeScript, Node.js, Python, React, Vue, Angular, Redux, Zustand, Vuex, REST, GraphQL, Microservices, Vite, Webpack, Babel, GitHub, GitLab, Azure, Jest, Cypress, Playwright, WCAG, AWS, GCP, Salesforce, CI/CD 🏢 Description: W tej roli odegrasz kluczową rolę w przyspieszeniu transformacji organizacji. Będziesz pracować w środowisku o dużym wpływie biznesowym, w cross-funkcyjnych zespołach produktowych, współtworząc nowoczesne, skalowalne rozwiązania cyfrowe. To idealna rola dla osoby, która lubi łączyć development z realnym wpływem na produkt, architekturę i sposób pracy zespołów. Zakres obowiązków: Projektowanie i rozwój aplikacji front-end (React, Vue lub Angular) oraz back-end (Node.js lub Python) Tworzenie skalowalnych rozwiązań w oparciu o architekturę mikroserwisową oraz API (REST, GraphQL, event-driven) Budowanie i rozwijanie komponentów UI, bibliotek współdzielonych oraz systemów designowych Zapewnienie wysokiej jakości kodu, wydajności, bezpieczeństwa i dostępności (WCAG) Wdrażanie testów automatycznych (unit, integracyjne, e2e) oraz dbanie o niezawodność systemów Rozwijanie i optymalizacja pipeline’ów CI/CD oraz automatyzacja procesów developerskich Współpraca z Product Managerami, designerami i architektami przy definiowaniu rozwiązań Mentoring innych inżynierów oraz udział w podejmowaniu decyzji technicznych Identyfikowanie ryzyk technologicznych i proponowanie rozwiązań na wczesnym etapie rozwoju produktu Współtworzenie nowoczesnej, zautomatyzowanej platformy cyfrowej Wymagania: Minimum 8 lat doświadczenia w rozwoju aplikacji Bardzo dobra znajomość JavaScript i TypeScript Doświadczenie w backendzie (Node.lub/i Python) Praktyczna znajomość nowoczesnych frameworków front-end'owych (React, Vue lub Angular) Znajomość architektury komponentowej i zarządzania stanem (Redux, Zustand, Vuex itp.) Doświadczenie w pracy z API (REST, GraphQL) oraz architekturą mikroserwisową Znajomość narzędzi buildowych (Vite, Webpack, Babel) i CI/CD (GitHub Actions, GitLab, Azure DevOps) Doświadczenie z frameworkami CSS (Tailwind, MUI, Chakra, Bulma) Dobra znajomość testów automatycznych (Jest, Cypress, Playwright) Zrozumienie obszarów: dostępność (WCAG), bezpieczeństwo, obserwowalność, performance Doświadczenie z chmurą (AWS, Azure lub GCP) Doświadczenie w pracy z Salesforce Doświadczenie w mentoringu i prowadzeniu decyzji technicznych Bardzo dobra znajomość języka angielskiego Mile widziane Doświadczenie z AI (np. agentic AI, narzędzia developerskie oparte o AI) Praca z design systems / Storybook Znajomość systemów rozproszonych i architektur event-driven Doświadczenie z zaawansowanymi praktykami bezpieczeństwa

🏢 Summary: The offer is for a QA Engineer responsible for manual and automated testing of web and mobile applications in a cloud-based environment. The role involves preparing test documentation, maintaining regression tests, reporting issues, and collaborating with cross-functional teams within CI/CD-driven processes. It provides opportunities to develop in test automation, API testing, performance testing, and test management. 🗂️ Requirements: Minimum 2 years of experience in testing web and mobile applications, Basic knowledge of GIT, Basic knowledge of SQL, Basic knowledge of JIRA or DevOps, Knowledge of CI and CD processes, Understanding of web applications and microservices, Ability to create effective test cases, Experience with manual testing, Ability to participate in test automation processes, Good command of English, Good command of Polish 📃 Skills: GIT, SQL, JIRA, DevOps, CI, CD, SOAP, REST, GraphQL, SoapUI, Postman, Selenium, Jmeter, C# 🏢 Description: We build innovative digital products for the modern workplace in the Cloud, and we need your help. Our products are being used by hundreds of thousands of employees worldwide, so it’s our top priority to deliver the best and bug-free experiences. The QA-friendly processes such as Continuous Integration, Continuous Delivery, and Code Review will help you at every step. You will always have direct contact with a Team Leader, UX Designer, and Product Owner, and access to all the resources you need to make your work efficient and fun. Responsibilities: prepare product and test documentation (case study, scenario, reports, etc.), prepare and maintain regression scenario tests, register requests/issues and report work results, coordinate the process of handling requests, clarify any possible concerns with analysts, developers and clients, participate in manual testing and test automation processes. Apply if you: have at least 2 years of experience in testing web and mobile applications, have at least basic knowledge of GIT, SQL, JIRA or Devops, know Software development process with CI and CD, have knowledge of how web applications and microservices work, are meticulous and able to creatively find solutions for any possible problems, are able to create effective test cases, can think creatively and skillfully find out-of-the-box solutions, are interested in modern technologies, have a good command of spoken and written English, have a good command of written and spoken Polish, are able to work in a team (everyday communication with testers, programmers, analysts and clients), are focused on long-term cooperation, development and expanding responsibilities (promotion to higher positions). Nice to have: knowledge of: SOAP/REST/GraphQL, SoapUI, Postman, Selenium, Jmeter, C#, higher technical education degree (including final year students). We offer: hybrid or on-site model of working, possible development towards: project test management and planning, planning and preparation of automated tests, planning and preparing API tests, planning and preparing performance tests, certifications and knowledge transfer, the latest technologies, which you will be working with, fully equipped workplace, benefits package (private medical care, Multisport card).