Senior Frontend Developer

🏢 Summary: The role is for a Senior Frontend Developer responsible for designing, developing, testing, deploying, and maintaining Angular-based frontend systems used in production across multiple European countries. The position involves working with modern frontend technologies, integrating with APIs, and collaborating in Agile teams to deliver new features and maintain high-quality applications. 🗂️ Requirements: 5+ years of production experience with Angular, Strong expertise in TypeScript, Experience with reactive programming using RxJS, Understanding of software engineering principles and testing practices, Experience with REST or GraphQL APIs, Familiarity with PostgreSQL or DynamoDB, Experience maintaining production systems, Degree in Computer Science, Experience working with Agile methodologies (SCRUM or Kanban), Proficiency in English 📃 Skills: Angular, TypeScript, JavaScript, RxJS, HTML, CSS, Cypress, Playwright, Node.js, REST, GraphQL, AWS, Terraform, PostgreSQL, DynamoDB 🏢 Description: About the role You will need to be an expert in frontend development with a thorough understanding of the technologies involved. Strong frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: Angular, TypeScript, JavaScript, RxJS, HTML, CSS, Cypress, Playwright, Node.js, REST/GraphQL APIs, AWS, Terraform Responsibilities: Designing, writing, testing functionalities for a frontend system written in Angular & TypeScript Deploying and maintaining frontend / backend applications Maintaining system on production used by consumers from several European countries Debugging issues Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Required qualifications: 5+ years of production software development experience in Angular Skilled within reactive programming patterns (RxJS) Strong understanding of software engineering principles, testing, design systems Solid hands-on experience in TypeScript Know-how of REST/GraphQL APIs Familiarity with DBMS like PostgreSQL, DynamoDB AI Tooling usage Computer Science degree Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Exposure to backend development (can be in TypeScript) Some experience or interest in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc.

🏢 Summary: Senior Frontend Developer role focused on designing, building, testing, deploying, and maintaining a React and TypeScript-based frontend system integrated with backend services and mobile apps. The position involves frontend architecture design, production support, and working within Agile teams to deliver scalable solutions used across multiple countries. 🗂️ Requirements: 5+ years of production experience with React, Strong hands-on experience with TypeScript, Strong understanding of software engineering principles, Experience with testing and design systems, Knowledge of REST APIs, Familiarity with DBMS such as PostgreSQL or DynamoDB, Degree in Computer Science, Experience working with Agile methodologies (SCRUM or Kanban), Experience using AI tooling 📃 Skills: React, TypeScript, JavaScript, HTML, CSS, REST, PostgreSQL, DynamoDB, Testing, DesignSystems, Agile, SCRUM, Kanban, AI 🏢 Description: About the role You will need to be an expert in frontend development with a thorough understanding of the technologies involved. Strong frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: React, TypeScript, JavaScript, HTML, CSS, Cypress, Playwright, Node.js, REST APIs, AWS, Terraform Responsibilities: Designing, writing, testing functionalities for a frontend system written in React & TypeScript Design frontend software architecture with connection to backend services and mobile apps Deploying and maintaining frontend / backend applications Maintaining system on production used by consumers from several European countries Debugging issues Scoping and assessing the complexity of features Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Recruiting and mentoring new team members Required qualifications: 5+ years of production software development experience in React Strong understanding of software engineering principles, testing, design systems Solid hands-on experience in TypeScript Know-how of REST APIs Familiarity with DBMS like PostgreSQL, DynamoDB Computer Science degree AI Tooling usage Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Exposure to backend development (can be in TypeScript) Some experience or interest in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc.

🏢 Summary: Frontend Developer role focused on building and evolving a large-scale, high-performance administrative web platform using React. The position emphasizes scalable architecture, code quality, automated testing, and integration with backend services. You will contribute to architectural decisions and maintain robust, maintainable frontend solutions in an enterprise environment. 🗂️ Requirements: 5+ years frontend development experience, Strong commercial experience with React, Expert knowledge of modern JavaScript (ES2024+), Advanced TypeScript proficiency, Experience integrating REST APIs, Hands-on experience with Webpack and Babel, Proficient with npm or yarn, Strong Git experience, Experience designing scalable frontend architectures, Experience with automated testing (unit, component, E2E) using Jest, React Testing Library, Cypress 📃 Skills: React, JavaScript, TypeScript, REST, Webpack, Babel, npm, yarn, Git, Jest, Cypress, GraphQL 🏢 Description: We are looking for an experienced Frontend Developer passionate about building scalable, high-performance user interfaces. In this role, you will contribute to the development and evolution of a large-scale administrative web platform, ensuring high code quality, maintainability, and performance. Key Requirements 5+ years of experience in frontend development, preferably in complex or enterprise-scale environments Strong commercial experience with React (state management, hooks, component lifecycle, application architecture) Expert knowledge of modern JavaScript (ES2024+) , including asynchronous programming and modular architecture Solid hands-on experience with TypeScript (advanced typing, generics, large-scale React integration) Experience integrating frontend applications with REST APIs (HTTP methods, authentication, data handling) Practical knowledge of build tools such as Webpack, Babel, npm/yarn Strong experience with Git (branching strategies, code reviews, conflict resolution) Experience designing and implementing scalable and high-performance frontend architectures Ability to write automated tests using Jest, React Testing Library, and Cypress Nice to Have Experience working with GraphQL in React-based applications Understanding and practical use of software design patterns Responsibilities Develop and enhance a complex React-based administrative platform Contribute to frontend architecture decisions and scalability improvements Maintain high standards of code quality (Clean Code, SOLID principles) Write and maintain unit, component, and end-to-end tests Collaborate with cross-functional teams in an agile delivery environment

🏢 Summary: Frontend Developer role focused on designing, developing, testing, deploying, and maintaining React and TypeScript applications used across multiple European markets. The position involves working with modern frontend technologies, integrating with REST/GraphQL APIs, and supporting production systems. The role requires strong software engineering expertise and collaboration within Agile teams. 🗂️ Requirements: 5+ years of production experience with React, Strong proficiency in TypeScript, Strong understanding of software engineering principles, Experience with testing and design systems, Experience with REST APIs, Experience with GraphQL APIs, Familiarity with PostgreSQL or DynamoDB, Computer Science degree, Experience with AI tooling, Experience working in Agile (SCRUM or Kanban) environments 📃 Skills: React, TypeScript, JavaScript, HTML, CSS, Cypress, Playwright, Node.js, REST, GraphQL, AWS, Terraform, PostgreSQL, DynamoDB, Docker, Kubernetes, Jenkins, CircleCI, GitlabCI, Datadog 🏢 Description: About the role You will need to be an expert in frontend development with a thorough understanding of the technologies involved. Strong frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: React, TypeScript, JavaScript, HTML, CSS, Cypress, Playwright, Node.js, REST/GraphQL APIs, AWS, Terraform Responsibilities: Designing, writing, testing functionalities for a frontend system written in React & TypeScript Deploying and maintaining frontend / backend applications Maintaining system on production used by consumers from several European countries Debugging issues Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Required qualifications: 5+ years of production software development experience in React Strong understanding of software engineering principles, testing, design systems Solid hands-on experience in TypeScript Know-how of REST/GraphQL APIs Familiarity with DBMS like PostgreSQL, DynamoDB Computer Science degree AI Tooling usage Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Exposure to backend development (can be in TypeScript) Some experience or interest in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc.

🏢 Summary: Offer for a Frontend Angular Developer to build and scale modern, high-performance web applications, including frontend development and partial backend work in Node.js. The role involves implementing UI based on UX/UI designs, integrating with APIs, and ensuring code quality and performance optimization. 🗂️ Requirements: Minimum 5 years of Frontend development experience, Commercial experience with Angular, Strong knowledge of JavaScript, Strong knowledge of HTML5, Strong knowledge of CSS3, Experience with Node.js, Experience with NPM, Experience with API integration, English level B2 or higher 📃 Skills: Angular, JavaScript, HTML5, CSS3, Node.js, NPM, REST 🏢 Description: About the project Poszukujemy Frontend Angular Developera do tworzenia i skalowania nowoczesnych, wydajnych aplikacji frontendowych. Our expectations Minimum 5 lat doświadczenia w pracy na stanowisku programisty Frontend; Znajomość technologii i doświadczenie w pracy z HTML5, CSS3; Znajomość technologii i doświadczenie w pracy z JavaScript; Znajomość technologii i doświadczenie w pracy z Angular; Znajomość technologii i doświadczenie w pracy z Node.js, NPM; Znajomość języka angielskiego na poziomie umożliwiającym swobodną komunikację (B2). Key tasks Tworzenie i rozwój aplikacji frontendowych; Implementacja interfejsów użytkownika zgodnie z wymaganiami biznesowymi i projektami UX/UI; Współpraca z backendem oraz integracja z API; Udział w tworzeniu i rozwoju części backendowej (Node.js); Zarządzanie zależnościami i środowiskiem projektu przy użyciu NPM; Dbanie o jakość kodu oraz stosowanie dobrych praktyk programistycznych; Współpraca z zespołem (developerzy, testerzy, designerzy); Udział w code review oraz rozwiązywaniu problemów technicznych; Optymalizacja wydajności aplikacji.

🏢 Summary: Full-stack C#/.NET engineer role focused on building, deploying, and maintaining backend microservices and modern frontend applications in React or Angular. The position involves designing system architecture, developing REST APIs, and managing cloud infrastructure on AWS using Terraform. You will work on production systems used across multiple European countries within an Agile environment. 🗂️ Requirements: 5+ years production experience as C# engineer, Strong frontend experience with React or Angular, Hands-on experience with .NET Core and .NET Framework, Experience with AWS and Terraform or CloudFormation, Experience with MS SQL, PostgreSQL, or DynamoDB, Expertise in REST APIs, Strong experience with CI/CD processes, Knowledge of OOP, SOLID principles, Clean Code, Experience in software architecture design, Computer Science degree, Experience with AI tooling, Experience working in Agile (SCRUM or Kanban) 📃 Skills: C#, .NET, .NETCore, TypeScript, JavaScript, Node.js, REST, React, Angular, AWS, Terraform, CloudFormation, MSSQL, PostgreSQL, DynamoDB, CICD, OOP, SOLID, CleanCode, Microservices, SCRUM, Kanban 🏢 Description: About the role You will need to be proficient in backend and frontend development with a thorough understanding of the technologies involved. Strong backend and frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: C#, .NET Core, .NET Framework, Typescript, JavaScript, Node.js, REST APIs, React, Angular, AWS, Terraform Responsibilities: Designing, writing, testing functionalities for a backend system written in C# and a frontend system written in React or Angular & TypeScript Design software architecture between backend, frontend and mobile apps Deploying and maintaining microservices in AWS using Terraform Maintaining system on production used by consumers from several European countries Debugging issues Scoping and assessing the complexity of features Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Recruiting and mentoring new team members Required qualifications: 5+ years of production software development experience in C# engineer role Exposure and experience in frontend development in React or Angular frameworks Solid hands-on experience in .NET Core and .NET Framework technologies Experience in working with AWS and Terraform / CloudFormation Strong knowledge of DBMS like MS SQL / PostgreSQL / DynamoDB Expertise of REST APIs Strong hands-on experience of CI&CD processes Proficiency in OO design patterns, SOLID principles, Clean Code and solving architectural problems Computer Science degree AI Tooling usage Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Working experience with one of the object-oriented and/or functional languages such as Java, Elixir, C++, Golang, Erlang, Python, Kotlin.

🏢 Summary: Full-stack software engineering role focused on building, deploying, and maintaining backend systems in C#/.NET and frontend applications in React or Angular. The position involves designing system architecture, developing microservices in AWS, and working within Agile teams to deliver scalable production solutions. Strong emphasis on cloud infrastructure, CI/CD, and clean architectural practices. 🗂️ Requirements: 5+ years of production experience in C# development, Hands-on experience with .NET Core and .NET Framework, Experience with React or Angular, Experience designing and consuming REST APIs, Experience with AWS and Terraform or CloudFormation, Experience with CI/CD processes, Knowledge of MS SQL, PostgreSQL, or DynamoDB, Understanding of OO design patterns and SOLID principles, Computer Science degree, Experience working in Agile (SCRUM or Kanban), Proficiency in English 📃 Skills: C#, .NET, TypeScript, JavaScript, Node.js, React, Angular, AWS, Terraform, CloudFormation, REST, SQL, PostgreSQL, DynamoDB, CI/CD, SCRUM, Kanban 🏢 Description: About the role You will need to be proficient in backend and frontend development with a thorough understanding of the technologies involved. Strong backend and frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with: C#, .NET Core, .NET Framework, Typescript, JavaScript, Node.js, REST APIs, React, Angular, AWS, Terraform Responsibilities: Designing, writing, testing functionalities for a backend system written in C# and a frontend system written in React or Angular & TypeScript Design software architecture between backend, frontend and mobile apps Deploying and maintaining microservices in AWS using Terraform Maintaining system on production used by consumers from several European countries Debugging issues Scoping and assessing the complexity of features Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams who depend on functionalities that you develop Recruiting and mentoring new team members Required qualifications: 5+ years of production software development experience in C# engineer role Exposure and experience in frontend development in React or Angular frameworks Solid hands-on experience in .NET Core and .NET Framework technologies Experience in working with AWS and Terraform / CloudFormation Strong knowledge of DBMS like MS SQL / PostgreSQL / DynamoDB Expertise of REST APIs Strong hands-on experience of CI&CD processes Proficiency in OO design patterns, SOLID principles, Clean Code and solving architectural problems Computer Science degree AI Tooling usage Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Working experience with one of the object-oriented and/or functional languages such as Java, Elixir, C++, Golang, Erlang, Python, Kotlin

🏢 Summary: Oferta dotyczy rozwoju nowoczesnych aplikacji frontendowych opartych o Angular, w tym tworzenia i utrzymania design systemu UI oraz integracji z backendem. Rola obejmuje projektowanie skalowalnych i bezpiecznych rozwiązań webowych, testowanie aplikacji oraz pracę w środowisku Agile. Kandydat będzie współpracować z zespołami produktowymi, UX/UI i technicznymi przy rozwijaniu nowych funkcjonalności. 🗂️ Requirements: Minimum 5 lat doświadczenia z Angular, Bardzo dobra znajomość TypeScript, Doświadczenie z NgRx, Znajomość RxJS, Doświadczenie w testowaniu aplikacji Angular, Znajomość optymalizacji wydajności frontend, Znajomość bezpieczeństwa aplikacji webowych, Doświadczenie z REST API, Doświadczenie z GraphQL, Doświadczenie z autoryzacją użytkowników, Znajomość Docker, Znajomość Webpack, Znajomość Git, Znajomość wzorców projektowych, Doświadczenie w Agile, Znajomość języka angielskiego min. B2, Umiejętność pracy zespołowej 📃 Skills: Angular, TypeScript, NgRx, RxJS, REST, GraphQL, Docker, Webpack, Git, Agile, Scrum, Kanban, E2E 🏢 Description: O projekcie Projekt obejmuje rozwój i wdrażanie nowych funkcjonalności w aplikacjach frontendowych, w tym rozwój design systemu oraz implementację rozwiązań opartych o Angular. Zakres obejmuje tworzenie skalowalnych, wydajnych i bezpiecznych aplikacji webowych z integracją z backendem. Twój zakres obowiązków rozwijanie i utrzymywanie design systemu UI we współpracy z projektantami UX/UI projektowanie oraz implementacja nowoczesnych aplikacji frontendowych tworzenie i utrzymywanie testów jednostkowych oraz integracyjnych współtworzenie backlogu produktu wraz z zespołem produktowym integracja aplikacji z usługami backendowymi współpraca z zespołami projektowymi i technicznymi tworzenie dokumentacji projektowej i technicznej udział w code review praca zgodnie z metodykami zwinnymi Nasze wymagania minimum 5 lat doświadczenia w programowaniu z wykorzystaniem Angular bardzo dobra znajomość TypeScript doświadczenie z NgRx i zarządzaniem stanem aplikacji praktyczna znajomość RxJS oraz programowania reaktywnego doświadczenie w testowaniu aplikacji Angular (testy jednostkowe i E2E) znajomość technik optymalizacji wydajności aplikacji frontendowych znajomość zagadnień bezpieczeństwa aplikacji webowych doświadczenie w integracji z backendem poprzez REST API oraz GraphQL doświadczenie w implementacji mechanizmów autoryzacji użytkowników praktyczna znajomość Docker, Webpack oraz Git znajomość wzorców projektowych i dobrych praktyk programistycznych doświadczenie w pracy w metodykach Agile, Scrum lub Kanban znajomość języka angielskiego na poziomie umożliwiającym pracę z dokumentacją techniczną (min. B2) bardzo dobre umiejętności komunikacyjne i współpracy zespołowej Mile widziane wykształcenie wyższe techniczne (informatyka, automatyka, robotyka, elektronika, teleinformatyka lub kierunki pokrewne)

🏢 Summary: Offer for a Senior Angular Developer focused on building and enhancing scalable, secure frontend applications and developing a UI design system. The role includes implementing modern Angular solutions, integrating with backend services, and ensuring high code quality through testing and code reviews. Work is carried out in an Agile environment with strong collaboration across product and technical teams. 🗂️ Requirements: Minimum 5 years of experience with Angular, Very good knowledge of TypeScript, Experience with NgRx and state management, Practical knowledge of RxJS and reactive programming, Experience in Angular unit and E2E testing, Knowledge of frontend performance optimization techniques, Knowledge of web application security, Experience with REST API and GraphQL integration, Experience implementing user authorization mechanisms, Practical knowledge of Docker, Practical knowledge of Webpack, Practical knowledge of Git, Knowledge of design patterns and programming best practices, Experience working in Agile, Scrum or Kanban, English proficiency at minimum B2 level 📃 Skills: Angular, TypeScript, NgRx, RxJS, REST, GraphQL, Docker, Webpack, Git, Agile, Scrum, Kanban 🏢 Description: O projekcie Projekt obejmuje rozwój i wdrażanie nowych funkcjonalności w aplikacjach frontendowych, w tym rozwój design systemu oraz implementację rozwiązań opartych o Angular. Zakres obejmuje tworzenie skalowalnych, wydajnych i bezpiecznych aplikacji webowych z integracją z backendem. Twój zakres obowiązków rozwijanie i utrzymywanie design systemu UI we współpracy z projektantami UX/UI projektowanie oraz implementacja nowoczesnych aplikacji frontendowych tworzenie i utrzymywanie testów jednostkowych oraz integracyjnych współtworzenie backlogu produktu wraz z zespołem produktowym integracja aplikacji z usługami backendowymi współpraca z zespołami projektowymi i technicznymi tworzenie dokumentacji projektowej i technicznej udział w code review praca zgodnie z metodykami zwinnymi Nasze wymagania minimum 5 lat doświadczenia w programowaniu z wykorzystaniem Angular bardzo dobra znajomość TypeScript doświadczenie z NgRx i zarządzaniem stanem aplikacji praktyczna znajomość RxJS oraz programowania reaktywnego doświadczenie w testowaniu aplikacji Angular (testy jednostkowe i E2E) znajomość technik optymalizacji wydajności aplikacji frontendowych znajomość zagadnień bezpieczeństwa aplikacji webowych doświadczenie w integracji z backendem poprzez REST API oraz GraphQL doświadczenie w implementacji mechanizmów autoryzacji użytkowników praktyczna znajomość Docker, Webpack oraz Git znajomość wzorców projektowych i dobrych praktyk programistycznych doświadczenie w pracy w metodykach Agile, Scrum lub Kanban znajomość języka angielskiego na poziomie umożliwiającym pracę z dokumentacją techniczną (min. B2) bardzo dobre umiejętności komunikacyjne i współpracy zespołowej Mile widziane wykształcenie wyższe techniczne (informatyka, automatyka, robotyka, elektronika, teleinformatyka lub kierunki pokrewne)

🏢 Summary: Fullstack engineering role focused on designing, developing, deploying, and maintaining backend services in TypeScript and frontend applications in React. The position involves building and operating microservices in AWS using Terraform, ensuring production stability, and contributing to architecture and feature planning. You will work in an Agile environment with strong emphasis on code quality, testing, and CI/CD practices. 🗂️ Requirements: 5+ years fullstack production experience, Strong TypeScript or C# experience, Experience with React development, Knowledge of PostgreSQL or DynamoDB, Experience building and consuming REST APIs, Hands-on experience with CICD pipelines, Understanding of data structures and algorithms, Knowledge of OOP, SOLID and CleanCode principles, Experience with AWS and infrastructure as code, Computer Science degree, Experience with Scrum or Kanban 📃 Skills: TypeScript, JavaScript, NodeJS, React, REST, AWS, Terraform, CSharp, PostgreSQL, DynamoDB, CICD, Docker, Kubernetes, Jenkins, CircleCI, GitLabCI, Datadog, Microservices, SOLID, CleanCode, OOP, Algorithms, DataStructures, Scrum, Kanban 🏢 Description: About the role You will need to be an expert in backend and frontend development with a thorough understanding of the technologies involved. Strong backend and frontend skills where you can demonstrate your ability to apply these technologies, as well as deploy and maintain them will be crucial to success. Technologies we work with:Typescript, JavaScript, Node.js, React, REST APIs, React, AWS, Terraform, C# Responsibilities: Designing, writing, testing functionalities for a backend system written in TypeScript and a frontend system written in React & TypeScript Deploying and maintaining microservices in AWS using Terraform Maintaining system on production used by consumers from several European countries Debugging issues Scoping and assessing the complexity of features Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Recruiting and mentoring team members Collaborating with other team members and teams that depend on the functionalities that you develop Required qualifications: 5+ years of production software development experience in a fullstack role Strong understanding of software engineering principles, testing, data structures and algorithms Solid hands-on experience in technologies such as Typescript or C# Strong knowledge of DBMS like PostgreSQL, DynamoDB Expertise of REST APIs Strong hands-on experience of CI&CD processes Proficiency of OO design patterns, SOLID principles and Clean Code Computer Science degree Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Self-motivation, proactive attitude Proficiency in English Nice to have: Some experience or interest in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc. Working experience with one of the object-oriented and/or functional languages such as C#, Elixir, C++, Java, Golang, Erlang, Python, Kotlin