Mid .NET Developer

🏢 Summary: 6-month fully remote contract for a Mid Front-End Developer to build and enhance a modern EdTech web application. The role focuses on implementing accessible, high-quality UI components in React 18 with TypeScript and integrating them with a .NET REST API. You will contribute to a scalable, testable frontend architecture aligned with established project standards. 🗂️ Requirements: 5+ years experience as a Frontend React Developer, Commercial experience with React 18, Strong proficiency in TypeScript, Experience with Redux Toolkit for state management, Experience integrating REST APIs using Axios, Experience with SCSS for styling, Practical knowledge of WCAG 2.2 AA accessibility standards, Experience writing unit or component tests, Experience integrating frontend with .NET REST APIs, Ability to ensure responsive and cross-browser compatibility 📃 Skills: React, TypeScript, Redux, Axios, SCSS, WCAG, HTML, ARIA, REST, .NET 🏢 Description: About the Project We are looking for a Mid Front-End Developer to join us on a web application project in the EdTech industry - an educational platform being delivered for our client. The product is a modern, user-facing web application aimed at an end-user audience that expects a polished, accessible experience. Tech context Frontend : React 18 with TypeScript Backend : .NET (REST API) Design source : Figma Make Engagement Duration : 6 months - project runs through October 2026 Start date : ASAP Capacity : 140 hours/month up to full-time, depending on your availability Work mode : fully remote Equipment : your own hardware Responsibilities Implement UI views and components in React 18 with TypeScript based on designs delivered via Figma Make, adapting them to the existing project structure and libraries in use. Build reusable, testable, and maintainable components that follow the conventions already established in the codebase. Manage application state using Redux Toolkit . Integrate the frontend with the .NET REST API using Axios - handle requests, responses, error states, and loading states. Style components with SCSS , keeping the styling layer consistent and scalable. Deliver interfaces that comply with WCAG 2.2 AA standards: semantic HTML, correct ARIA usage, full keyboard navigation, sufficient color contrast, accessible forms, proper focus management, and screen reader compatibility. Write unit and/or component tests to protect critical flows and keep the codebase safe to change. Participate in code reviews - both as an author and as a reviewer - and contribute to raising the quality bar of the project. Collaborate daily with designers, backend developers, QA, and the Project Manager to scope, estimate, and deliver features. Support cross-browser and responsive behavior across target devices. Communicate blockers and risks early so we can replan together. Technical Requirements Required 5+ years of relevant experience as a Frontend React Developer Solid commercial experience with React 18 and TypeScript (this is the most important criterion). Redux Toolkit for state management. Axios for API integration. SCSS for styling. Working knowledge of WCAG accessibility requirements and experience applying them in production code. English - sufficient for written and spoken communication within the team. Nice to have Ant Design component library. Vitest for unit/component testing. Storybook for component development and documentation. Recruitment Process CV screening Technical interview Decision If this sounds like a fit, we'd love to see your CV.

🏢 Summary: The role involves developing and maintaining scalable full-stack web applications using .NET and modern frontend frameworks. You will design robust Web APIs, optimize databases, and implement clean, testable code within CI/CD-driven environments. The position requires active participation in the full software development lifecycle for international projects. 🗂️ Requirements: Minimum 3 years commercial experience with .NET (C#, Web API, Entity Framework), Proficiency in Angular or React, Strong knowledge of JavaScript, HTML, CSS, Experience with SQL Server or PostgreSQL, Understanding of Unit Testing, Experience with Git, Experience with CI/CD pipelines, Knowledge of design patterns, Knowledge of software development best practices, Fluent English (min. B2), Availability for hybrid work mode 📃 Skills: .NET, C#, WebAPI, EntityFramework, Angular, React, JavaScript, HTML, CSS, SQL, SQLServer, PostgreSQL, UnitTesting, Git, CI/CD 🏢 Description: As a member of our development team, you will be responsible for building scalable web applications, designing robust APIs, and creating intuitive user interfaces. We value clean code, analytical thinking, and a proactive approach to technology. Our expectations: Minimum 3 years of commercial experience in .NET (C#, Web API, Entity Framework). Proficiency in Angular or React, along with JavaScript, HTML, CSS, and modern frontend libraries. Strong experience with relational databases such as SQL Server or PostgreSQL. Solid understanding of Unit Testing, Git, and CI/CD pipelines. Practical knowledge of design patterns and software development best practices. A collaborative mindset and the ability to explain complex technical issues clearly. Strong analytical skills and a "get it done" attitude. Fluent English (min. B2) for smooth collaboration with international partners. Open to work in hybrid mode. Main responsibilities: You will design, develop, and maintain scalable full-stack applications using .NET and modern frontend frameworks (Angular/React) for diverse client projects. You will be responsible for writing clean, testable code and implementing unit tests to ensure the highest software performance and reliability. You will work closely with cross-functional teams to architect robust Web APIs and optimize database schemas while following industry best practices and design patterns. You will actively participate in the full software development life cycle, including CI/CD processes and version control management, to ensure seamless project delivery.

🏢 Summary: The role involves developing and maintaining an enterprise-grade web application within the .NET ecosystem, with a strong focus on backend development and system architecture. You will design and enhance REST APIs, implement business logic, and integrate modern .NET Core solutions with legacy .NET Framework components. The position emphasizes scalable architecture, database optimization, and high code quality through comprehensive testing. 🗂️ Requirements: 5+ years of experience in .NET development, Strong expertise in .NET Core and backend systems, Experience designing and building REST APIs, Hands-on experience with Entity Framework Core, Experience with relational databases, especially SQL Server, Understanding of software architecture and design patterns, Experience working with .NET Framework 4.8, Experience with unit, integration, and end-to-end testing, Ability to integrate and maintain backend services, Basic knowledge of React or experience collaborating with frontend teams 📃 Skills: .NET, C#, ASP.NET, REST, Swagger, OpenAPI, EntityFramework, SQLServer, SQLite, React, xUnit, NUnit, AI, Copilot, ChatGPT 🏢 Description: Additional information The project focuses on the development and maintenance of an enterprise-grade web application built on the .NET ecosystem, with a strong emphasis on backend and system architecture. The main responsibility is to design and enhance REST APIs and business logic , including integration with existing components based on .NET Framework 4.8. The system relies on relational databases (SQL Server) and ORM solutions such as Entity Framework Core, with a strong focus on quality through multi-level testing. The role also involves collaboration with the frontend layer (React), although it is not the primary focus. The environment requires a high level of autonomy, technical decision-making, and a proactive approach to improving the existing architecture. You’re ideal for this role if you: Have 5+ years of experience in .NET development, with strong expertise in .NET Core and backend systems Are confident in designing and building REST APIs, including architecture and best practices (e.g., Swagger/OpenAPI) Have hands-on experience with Entity Framework Core and relational databases such as SQL Server Understand software architecture, design patterns, and how to build scalable, maintainable systems Are familiar with legacy environments, including .NET Framework 4.8, and can work across modern and existing solutions Have solid experience with testing (unit, integration, end-to-end) and care about code quality Have basic knowledge of React or are comfortable working closely with frontend teams Use AI tools (e.g., Copilot, ChatGPT) to improve development efficiency Take ownership of your work and proactively identify improvements rather than waiting for tasks Your day-to-day responsibilities include:​ Designing, developing, and maintaining backend services using .NET Core Building and enhancing REST APIs, ensuring performance, scalability, and clear documentation (Swagger/OpenAPI) Integrating new features with existing systems based on .NET Framework 4.8 Implementing business logic and ensuring consistency across application layers Working with databases (SQL Server, SQLite) and optimizing data access with Entity Framework Core Writing and maintaining tests (unit, integration, end-to-end) to ensure high code quality Collaborating with frontend developers (React) to ensure smooth end-to-end functionality Participating in architectural discussions and contributing to technical decisions Identifying areas for improvement and proactively proposing enhancements Using AI tools to streamline development and increase productivity

🏢 Summary: Fullstack Developer role focused on building and enhancing dynamic web applications using .NET on the backend and React on the frontend. The position involves developing robust, high-performance solutions, integrating APIs, and resolving complex technical issues within a collaborative team environment. Strong emphasis is placed on delivering seamless end-to-end functionality. 🗂️ Requirements: 5+ years of fullstack development experience, .NET backend expertise, Strong React knowledge, Experience with WCF and REST APIs, Database management experience, Proficiency in HTML, JavaScript, CSS, Understanding of message queues, Fluent English communication 📃 Skills: .NET, C#, React, REST, WCF, SQL, HTML, JavaScript, CSS, Databases, MessageQueues, English 🏢 Description: Summary: The ideal candidate is expected to function as a Fullstack Developer, contributing both front-end and back-end functionalities with a strong focus on .NET and React technologies. The primary goal is to enhance the team's capabilities in developing seamless, robust applications. Main Responsibilities: Engage in full-stack development to create dynamic web applications. Implement the front-end components using React. Develop back-end services using .NET. Communicate effectively with team members and stakeholders in English. Investigate and resolve complex technical problems proactively. Collaborate with team members to enhance application performance and usability. Key Requirements: 5+ years of experience in fullstack development. Expertise in .NET for backend development. Strong understanding of React for frontend development. Fluent communication skills in English. Knowledge of Web APIs (WCF and REST APIs). Familiarity with database management. Competence in HTML, JavaScript, and CSS. Understanding of message queues. Nice to Have: Experience with cloud services or platforms. Familiarity with CI/CD practices. Exposure to Agile methodologies.

🏢 Summary: Fullstack Developer role focused on building and enhancing dynamic web applications using .NET on the backend and React on the frontend. The position involves developing robust services, implementing responsive UI components, and resolving complex technical issues. The goal is to strengthen the team’s capability to deliver high-performance, scalable applications. 🗂️ Requirements: 5+ years of fullstack development experience, .NET expertise for backend development, Strong React knowledge for frontend development, Experience with Web APIs (WCF, REST), Database management experience, Proficiency in HTML, JavaScript, CSS, Understanding of message queues 📃 Skills: .NET, React, WCF, REST, WebAPI, HTML, JavaScript, CSS, SQL, Databases, MessageQueues 🏢 Description: Summary: The ideal candidate is expected to function as a Fullstack Developer, contributing both front-end and back-end functionalities with a strong focus on .NET and React technologies. The primary goal is to enhance the team's capabilities in developing seamless, robust applications. Main Responsibilities: Engage in full-stack development to create dynamic web applications. Implement the front-end components using React. Develop back-end services using .NET. Communicate effectively with team members and stakeholders in English. Investigate and resolve complex technical problems proactively. Collaborate with team members to enhance application performance and usability. Key Requirements: 5+ years of experience in fullstack development. Expertise in .NET for backend development. Strong understanding of React for frontend development. Fluent communication skills in English. Knowledge of Web APIs (WCF and REST APIs). Familiarity with database management. Competence in HTML, JavaScript, and CSS. Understanding of message queues. Nice to Have: Experience with cloud services or platforms. Familiarity with CI/CD practices. Exposure to Agile methodologies.

🏢 Summary: The offer is for a .NET Developer responsible for building and enhancing scalable backend systems and REST APIs for global travel platforms. The role involves contributing to architecture, optimizing performance, and collaborating in an agile environment to deliver reliable, high-quality software. It includes hybrid work, international projects, and professional development opportunities. 🗂️ Requirements: Minimum 3 years of commercial experience with .NET development, Strong knowledge of ASP.NET MVC, Experience developing REST APIs, Experience working in agile software development teams, Good knowledge of MS SQL, Good knowledge of Elasticsearch, Experience with CI/CD tools (Git, TeamCity or similar), Experience writing unit and integration tests, Ability to write clean, maintainable, and well-tested code, Very good English communication skills 📃 Skills: .NET, ASP.NET, MVC, REST, MS SQL, Elasticsearch, Git, TeamCity, CI/CD, UnitTesting, IntegrationTesting, Umbraco, Angular, AWS 🏢 Description: We are looking for a .NET Developer to join our team and help build scalable, high-quality solutions that power our global travel platforms. In this role, you will work on the development and enhancement of backend systems, contribute to architectural decisions, and collaborate with cross-functional teams to deliver reliable and efficient software used by customers worldwide. Your responsibilities Design, develop, and maintain applications using .NET technologies Translate business requirements into scalable and maintainable technical solutions Develop and enhance REST APIs and backend services Maintain, troubleshoot, and improve existing applications Refactor and optimize code to improve performance, scalability, and maintainability Write clean, well-structured, and testable code following best practices Participate in code reviews and contribute to improving development standards Identify and resolve performance bottlenecks and system issues Contribute to application architecture, technical design, and system documentation Collaborate closely with developers, QA engineers, Product Owners, and other stakeholders in an agile environment Our requirements At least 3 years of commercial experience with .NET development Strong knowledge of ASP.NET MVC and REST APIs Experience working within agile software development teams Good knowledge of MS SQL and Elasticsearch Experience with CI/CD tools and practices (Git, TeamCity or similar) Experience writing unit and integration tests Ability to write clean, maintainable, and well-tested code Very good English communication skills Nice to have Experience with Umbraco CMS Experience with Angular Knowledge of AWS services and cloud-based solutions How we work Clean Code principles Design patterns and software engineering best practices Code reviews and knowledge sharing Static code analysis Continuous Integration and Continuous Deployment (CI/CD) Agile and collaborative development environment What we offer Hybrid work model (1–2 days per week in our Katowice office) Opportunity to work on international, large-scale projects Attractive remuneration paid in EUR Flexible working hours Individual development budget Partially or fully funded training and certifications English lessons Mentoring and support from experienced technical leaders Participation in conferences in Poland and abroad A culture focused on learning, collaboration, and knowledge sharing Space to innovate and bring your own ideas to life Support for IT community initiatives

🏢 Summary: Backend developer role in an agile team working on a .NET 8 system built with Clean Architecture and a modular monolith approach. The position involves developing and maintaining backend services, managing Azure integrations, supporting CI/CD in Azure DevOps, and ensuring high quality through automated testing. Close collaboration with business stakeholders and preparation of technical designs are required. 🗂️ Requirements: Experience with .NET 8 development, Practical knowledge of Clean Architecture, Experience with Modular Monolith architecture, Backend service development experience, Experience with Azure integrations, Experience with Azure DevOps CI/CD, Knowledge of Entity Framework Core, Experience with Azure SQL, Experience with unit testing, Experience with end-to-end testing, Ability to prepare technical design documentation, Experience working in Agile teams 📃 Skills: .NET, C#, Azure, MassTransit, ServiceBus, EntraID, APIM, Redis, KeyVault, Storage, EntityFramework, SQL, xUnit, Playwright, AzureDevOps, React, LogicApps 🏢 Description: Role Overview We are looking for a developer to join an established project team. The system is built on .NET 8 using Clean Architecture and a modular monolith approach. Candidates must have practical experience working within these patterns and maintaining clear domain boundaries. The role is delivered in an agile team and requires close cooperation with the business side, including technical analysis and short technical design preparation. Engineers will also maintain the backend architecture, handle Azure integrations, and support CI/CD processes in Azure DevOps. Key Responsibilities Develop and maintain backend services in .NET 8 Collaborate closely with Business Analysts by performing technical analysis and translating requirements into implementations. Prepare concise technical designs and documentation for delivered solutions. Maintain and evolve the backend architecture with strict domain boundaries. Manage complex Azure integrations Contribute to CI/CD and release workflows in Azure DevOps. Ensure high quality through unit and end-to-end testing (xUnit, Playwright). Support full-stack delivery with React or workflow automation using Azure Logic Apps. Tech Stack .NET 8 Clean Architecture & Modular Monolith Azure ecosystem: MassTransit, Service Bus, Entra ID, APIM, Redis Cache, Key Vault, Storage Accounts Entity Framework Core & Azure SQL MI Testing: xUnit, Playwright Optional: React, Azure Logic Apps

🏢 Summary: Full-stack freelance role focused on building scalable, cloud-native applications using .NET and Angular within the Azure ecosystem. The position involves translating complex business requirements into high-quality software solutions while applying modern architectural patterns and Agile delivery practices. The contract is project-based B2B for an initial 12-month period. 🗂️ Requirements: 4+ years experience with .NET technologies (C#, .NET Core, EF/ORM, WCF), 3+ years experience with Angular or strong React background with recent Angular experience, 2+ years hands-on experience with Azure services (Functions, Logic Apps, Web Apps), Advanced knowledge of architectural and design patterns, Experience with SOAP and REST web services, Experience with SQL and SQL Server, Experience with Git and CI/CD pipelines, Experience with Unit Testing, Fluent English 📃 Skills: .NET, .NETCore, C#, EntityFramework, ORM, WCF, Angular, React, Azure, Functions, LogicApps, WebApps, SQL, SQLServer, Git, CI/CD, SOAP, REST, Agile, UnitTesting 🏢 Description: Join an international team of experts delivering high-impact software solutions for global clients. In this role, you will work in a full-stack capacity, translating complex business requirements into scalable, cloud-native applications. You will collaborate with top-tier professionals to design and implement innovative solutions that address real-world engineering challenges while ensuring the highest industry standards. Form of cooperation: freelance project-specific B2B contract for an initial period of approximately 12 months. Tech stack: Backend: .NET / .NET Core, C#, Entity Framework (or other ORM), WCF, SOAP/REST APIs. Frontend: Angular (primary), React. Cloud: Azure (Functions, Logic Apps, Web Apps, SQL Server). Data: SQL Server. DevOps/Tools: Git, CI/CD, Agile, Unit Testing. Requirements: 4+ years of professional experience with .NET technologies (C#, .NET Core, EF/ORM, WCF) 3+ years of experience in Angular (or strong React background with recent Angular experience) 2+ years of hands-on experience with Azure services (e.g., Functions, Logic Apps, Web Apps) Advanced knowledge of Architectural and Design Patterns Proficiency in Web Services (SOAP/REST) and SQL Experience with Git, Continuous Integration, and Continuous Delivery pipelines Fluent English (written and spoken) for effective international communication Ideally, you’ll also have: Azure Cloud certifications Main responsibilities: Full-Stack Development: Address complex software engineering problems using both object-oriented and functional programming styles. Quality Assurance: Maintain high standards of code quality and testing through Clean Code and Unit Testing practices. Cloud Engineering: Design and develop scalable solutions utilizing a wide range of Azure-hosted services and tools. Agile Delivery: Implement Agile methodologies and modern software delivery techniques, including CI/CD and automated deployment. Professional Growth: Proactively adopt new technologies and frameworks within the Azure Cloud ecosystem to drive project success.

🏢 Summary: The offer is for a Senior .NET Developer with 5+ years of experience to design, develop, and maintain scalable backend applications using modern .NET technologies. The role focuses on building high-quality APIs, contributing to architectural decisions, and ensuring application reliability in cloud-based environments. It involves close collaboration with cross-functional teams and strong engagement in testing, CI/CD, and production support. 🗂️ Requirements: Minimum 5 years of experience with .NET development, Strong experience with C# and .NET Core, Solid understanding of REST APIs, Experience with Entity Framework Core, Strong knowledge of SQL, Experience with cloud platforms (Azure or AWS), Experience with CI/CD pipelines, Experience with Git version control, Experience with unit and integration testing, Experience with message broker systems, Familiarity with agile development practices 📃 Skills: C#, .NET, .NETCore, REST, EntityFramework, SQL, Azure, AWS, CI/CD, Git, UnitTesting, IntegrationTesting, MessageBroker, Angular, Docker, Kubernetes, Microservices 🏢 Description: Summary: We’re looking for a highly skilled .NET Developer with a minimum of 5 years of experience. This role focuses on solving complex problems, building high-quality software, and contributing to a collaborative engineering culture. The candidate should be passionate about clean architecture, modern .NET development, and delivering impactful solutions. Responsibilities: Analyze, design, develop, and maintain applications using .NET / .NET Core. Build scalable backend services (APIs). Collaborate with cross-functional teams (Business, Dev, Infra, etc.). Participate in code reviews to elevate engineering standards. Contribute to architectural decisions and technical roadmaps. Provide business support and monitor applications (level 2 support, incident resolution, and troubleshooting). Key Requirements: Strong experience with C# and .NET Core. Solid understanding of REST APIs, Entity Framework Core, and SQL. Familiarity with cloud platforms (Azure or AWS). Experience with CI/CD pipelines and version control (Git). Strong testing culture: unit tests, integration tests, and production validation. Familiarity with agile development practices. A mindset focused on quality, performance, and maintainability. Experience with a message broker. Nice to Have: Knowledge of microservices architecture. Experience with front-end frameworks (Angular). Background in distributed systems or high-availability environments. Knowledge of Docker & Kubernetes. Experience with Azure functions. Other Details: This position allows for flexibility and may accommodate remote work arrangements. Candidates should be prepared for collaborative team engagements with a focus on delivering high-quality software solutions.

🏢 Summary: Fullstack Developer role focused on designing, developing, and maintaining web applications using Angular and .NET within an NX monorepo architecture. The position involves building RESTful APIs, microservices, and responsive front-end interfaces while ensuring high code quality, performance, and security. The role also includes working with relational databases, automated testing, and CI/CD pipelines in Azure DevOps. 🗂️ Requirements: Minimum 5 years of full-stack development experience with Angular and .NET, Strong proficiency in C# and .NET Core/Framework, Experience with Entity Framework and LINQ, Solid experience with Angular (v12+) and TypeScript, Strong knowledge of RxJS, Hands-on experience with NX monorepo, Experience writing unit and integration tests with Jest, Experience with DevExtreme, Proficiency with Visual Studio, Hands-on experience with Git, Experience with Azure DevOps Services, Experience with SQL Server and query optimization, Knowledge of REST API design and HTTP standards, Understanding of software design patterns and SOLID principles, Bachelor's degree in Computer Science, Engineering, or equivalent experience 📃 Skills: Angular, TypeScript, RxJS, NgRx, .NET, C#, EntityFramework, LINQ, NX, Jest, DevExtreme, VisualStudio, Git, AzureDevOps, SQLServer, PostgreSQL, REST, HTTP 🏢 Description: We’re looking for Fullstack developer The primary objective of this role is to design, develop, and maintain full-stack web applications using Angular and .NET technologies while adhering to modern architectural best practices. Main Responsibilities: Design, develop, and maintain full-stack web applications using Angular and .NET in an NX monorepo architecture. Develop RESTful APIs and microservices using .NET Core/Framework, following Clean Architecture principles. Build responsive, user-friendly interfaces with Angular, incorporating modern patterns like RxJS and NgRx. Work with relational databases like SQL Server and PostgreSQL, designing efficient data models. Write comprehensive unit and integration tests using Jest for maintaining high code quality. Manage version control with Git and oversee CI/CD pipelines in Azure DevOps Services. Participate in code reviews to improve code quality and team practices. Collaborate with product managers, UX designers, and other developers to deliver solutions on time. Contribute to optimizing application performance and ensuring security best practices. Key Requirements: Minimum 5 years of experience in full-stack development with Angular and .NET. Strong proficiency in C#, .NET Core/Framework, Entity Framework, and LINQ. Solid experience with Angular (v12+), TypeScript, and RxJS. Hands-on experience with NX monorepo structure. Proficiency with Jest for writing unit and integration tests. Experience with the DevExtreme component library. Proficiency with Visual Studio for .NET development. Hands-on experience with Git and Azure DevOps Services. Experience with SQL Server and optimized queries. Knowledge of REST API design and HTTP standards. Understanding of software design patterns and SOLID principles. Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience). Nice to Have: Experience in agile methodologies. Familiarity with cloud services like Azure or AWS. Exposure to frontend testing frameworks like Jasmine.