.NET Developer

🏢 Summary: Full-time remote B2B role for a .NET Developer to maintain and enhance an existing ASP.NET self-service portal in the debt collection industry. The position focuses on stabilizing legacy code, managing IIS hosting, and ensuring secure authentication, with occasional development of new features. Project runs until the end of 2026 with possible extension. 🗂️ Requirements: Proficiency in ASP.NET Web Forms / classic .NET, Experience with IIS hosting and configuration, Strong understanding of legacy authentication methods, Ability to read and stabilize poorly documented codebases 📃 Skills: ASP.NET, WebForms, .NET, IIS, Authentication 🏢 Description: Industry: debt collection Remote work: 100% Project language: English FTE: full-time (if you are interested in part-time, it’s also ok) Project length: until the end of 2026 + prolongations Start: ASAP Assignment type: B2B Remuneration: up to 180 PLN/h Job Summary: The .NET Developer will be primarily responsible for maintaining and developing an existing self-service portal used by customers and clients, which incorporates legacy code as well as newer components. Responsibilities: Maintain and stabilize an existing ASP.NET application, ensuring uptime and functionality. Perform IIS hosting and configuration for the application. Understand legacy authentication patterns to facilitate secure access. Work with poorly documented codebases, improving clarity and stability. Periodically develop new features as required by the project. Must Haves: Proficient in ASP.NET Web Forms / classic .NET technology (e.g., client_login.aspx). Experience with IIS hosting and configuration. Strong understanding of legacy authentication methods. Ability to read and stabilize poorly documented codebases. Nice to Have: Familiarity with newer development practices and components (e.g., ASP.NET MVC Core). Experience with MS SQL, including queries and stored procedures. Knowledge of application maintenance workflows.

🏢 Summary: Long-term B2B contract for a .NET Developer to remotely develop, maintain, and enhance a multi-country web self-service portal. The role focuses on building new features, supporting production environments, and increasing self-service adoption through Azure-based solutions. 🗂️ Requirements: Experience with ASP.NET Core, Experience with Azure services: Application Insights, Log Analytics, Key Vault, API Management, RBAC, Managed Identity, Experience with Azure DevOps: Boards, Pipelines, Experience in maintaining production (PROD) environments, Ability to analyze and resolve issues based on logs, Experience working in Lean approach with high-level requirements 📃 Skills: C#, .NET, ASP.NET, Azure, ApplicationInsights, LogAnalytics, KeyVault, APIManagement, RBAC, ManagedIdentity, AzureDevOps, Boards, Pipelines, Docker, Kubernetes, ArgoCD, IdentityServer, OpenIddict, OIDC, PostgreSQL, AzureStorage 🏢 Description: Stanowisko: .NET Developer Miejsce pracy: 100% zdalnie Start: asap Forma współpracy: B2B z ITFS, współpraca długofalowa Stawka: 100-135 PLN netto + VAT/h Zadania: ·        Rozwój nowych funkcjonalności, wsparcie oraz utrzymanie webowego portalu self-service dla wszystkich jednostek klienta ·        Współpraca przy realizacji celu klienta polegającego na zwiększeniu liczby klientów obsługiwanych przez self-service poprzez rozwój i rozbudowę grupowego portalu self-service używanego przez klientów w wielu krajach Wymagania: ·        ASP .NET Core ·        Azure (Application Insights, Log Analytics, Key Vault, API Management, RBAC + Managed Identity) ·        Azure DevOps (Boards, Pipelines) ·        Utrzymanie środowiska produkcyjnego (PROD) oraz analiza i rozwiązywanie problemów na podstawie logów ·        Praca w podejściu Lean, w tym realizacja nieprecyzyjnych, wysokopoziomowych zadań (vague, high-level stories) Mile widziany: ·        Docker / Kubernetes / ArgoCD ·        Identity Server / OpenIddict / OIDC flow ·        Doświadczenie w integracjach z dostawcami płatności ·        Doświadczenie z PostgreSQL oraz Azure (Storage Account Tables) ·        Doświadczenie w projektowaniu komunikacji między usługami na poziomie architektury ·        Umiejętność prowadzenia dyskusji i doradzania zarówno na poziomie technicznym, jak i użytkownika końcowego Oferujemy: ·        Przejrzyste warunki współpracy w firmie o pewnej i stabilnej pozycji rynkowej oraz możliwość rozwoju ·        Możliwość skorzystania z benefitów (dofinansowanie do pakietu medycznego Enel-med i Multisport oraz podstawowy pakiet księgowy - darmowy do trzech faktur miesięcznie)

🏢 Summary: Remote Senior .NET Developer role in the banking sector focused on developing and scaling banking systems, integrating securities and banking operations, and supporting cloud-based applications. The position requires strong full-stack .NET and Angular expertise, experience with testing and event-driven systems, and familiarity with banking environments. The recruitment process includes a skills assessment and technical interview. 🗂️ Requirements: 5+ years of .NET development experience, Angular proficiency, Full-stack development experience, Hands-on code testing experience, Knowledge of SOLID principles, Experience with document-based databases, MongoDB experience, Unit testing experience, Integration testing experience, Experience with event-based messaging frameworks, Banking industry experience 📃 Skills: .NET, Angular, MongoDB, SOLID, Testing, Messaging, Cloud, Containers 🏢 Description: Work model: This is a remote opportunity within the banking sector, Start date: ASAP Rate: up to 180 zl/h under a B2B arrangement. Recruitment process : The recruitment process includes a skills assessment and a technical interview. Introduction & Summary: We are seeking a highly skilled Senior .NET Developer with a strong background in developing and extending systems for the banking industry. The ideal candidate will possess at least 7 years of experience in .NET development along with proficiency in front-end technologies, particularly Angular. This is a 100% remote position requiring a proactive approach towards scaling applications and supporting cloud-based solutions. Main Responsibilities: Develop and extend systems to support additional entities. Merge securities and banking operations seamlessly. Provide support for 17 applications including product control and risk management. Utilize in-house development frameworks. Scale systems for cloud-based operations to onboard new entities. Key Requirements: 5+ years of experience in .NET development. Proficiency in front-end technologies, specifically Angular. Full-stack development experience with hands-on code testing. Solid understanding of SOLID design principles. Experience with document-based databases. Familiarity with MongoDB. Integrated experience with unit and integration testing. Experience with event-based messaging frameworks. Background in the banking industry. Nice to Have: Advanced cloud computing skills. Experience with containerized solutions.

🏢 Summary: Long-term project for a Senior/Expert .NET Developer focused on backend and API development within enterprise banking systems. The role involves developing and optimizing software solutions, working with legacy code, and providing technical leadership and mentorship. The position emphasizes high-quality standards, collaboration, and code excellence in a complex financial environment. 🗂️ Requirements: Strong knowledge of C#, Strong knowledge of .NET framework, Expertise in ASP.NET Core, Experience in API development, Experience with SQL Server design and development, Ability to analyze and troubleshoot legacy code, Solid understanding of OOP principles, Knowledge of software engineering best practices 📃 Skills: C#, .NET, ASP.NET, SQL, T-SQL, Git, Jenkins, Angular, HTML, CSS, JavaScript, Visual Studio, Postman, Swagger, Bitbucket, Bootstrap, SQL Server 🏢 Description: We’re looking for an Expert/Senior .NET Developer to join a long-term project for a leading client in the banking industry. Project Type: Enterprise banking systems – backend & API development, code optimization, and mentorship Responsibilities: Design, develop, and maintain software solutions Analyze, refactor, and troubleshoot legacy code Conduct code reviews and uphold high-quality standards Collaborate with QA and Business Analysts Mentor junior developers and provide technical leadership Must-Have Experience: Strong knowledge of C# and the .NET framework Expertise in ASP.NET Core and API development Experience with SQL Server (design & development) Ability to work with and troubleshoot legacy code Solid understanding of OOP and software engineering best practices Nice-to-Have: Familiarity with Git, Jenkins, and testing frameworks Understanding of cloud concepts & web security best practices Knowledge of frontend technologies (Angular, HTML, CSS, JavaScript) Tools & Tech Stack:Visual Studio, Postman, Swagger, Bitbucket, SQL Server Management Studio, T-SQL, Bootstrap (or similar)

🏢 Summary: The offer is for a .NET Developer to design, develop, and maintain modern web applications and RESTful APIs using Microsoft technologies. The role focuses on ASP.NET Core development, API-first design, Optimizely CMS customization, and ensuring performance, security, and scalability. It also involves contributing to CI/CD processes and reusable component development. 🗂️ Requirements: Strong experience with C# and .NET, Hands-on experience with ASP.NET Core MVC, Experience with Web APIs, Experience designing and consuming REST APIs, Knowledge of OpenAPI/Swagger, Experience with NuGet package management, Experience with Optimizely CMS, Knowledge of JavaScript, Knowledge of TypeScript, Knowledge of HTML, Knowledge of CSS, Experience with Git 📃 Skills: C#, .NET, ASP.NET, MVC, WebAPI, REST, OpenAPI, Swagger, NuGet, Optimizely, Episerver, JavaScript, TypeScript, HTML, CSS, Git, Azure, Docker, React, Angular 🏢 Description: Summary: We are looking for a skilled .NET Developer to support our engineering team in the development and maintenance of modern web applications and APIs. This role is vital for enhancing digital experiences, leveraging Microsoft technologies, and ensuring optimal performance of our systems. Responsibilities: Design, develop, test, and maintain applications using .NET and ASP.NET Core. Develop and enhance RESTful APIs following API-first design principles. Create, maintain, and consume OpenAPI (Swagger) specifications. Build web applications utilizing ASP.NET Core MVC and Web API frameworks. Customize solutions using Optimizely (Episerver) CMS and Commerce platforms. Implement content models and components within Optimizely. Design reusable libraries and manage package publishing through NuGet. Collaborate with architects, product owners, and UX designers to provide quality solutions. Participate in code reviews, testing, and performance optimization. Contribute to CI/CD pipelines and deployment automation. Ensure security, scalability, and reliability in applications. Must Haves: Strong experience with C# and .NET development. Hands-on experience with ASP.NET Core MVC and Web APIs. Experience designing and consuming REST APIs. Strong knowledge of OpenAPI/Swagger specifications. Experience with NuGet package management. Experience with Optimizely (Episerver) CMS. Good knowledge of JavaScript, TypeScript, HTML, and CSS. Experience with Git. Nice to Haves: Experience with Optimizely Commerce and its features. Experience with Azure Cloud Services. Knowledge of Docker. Experience with automated testing frameworks. Understanding of microservices architecture. Familiarity with frontend frameworks like React or Angular.

🏢 Summary: The offer is for a .NET Developer to develop, enhance, and maintain a web self-service platform used across multiple countries. The role involves building new features, supporting production environments, and collaborating with cross-functional teams in a cloud-based Azure environment. The position emphasizes modern DevOps practices and continuous improvement of a customer-facing portal. 🗂️ Requirements: Experience with ASP.NET Core, Proficiency in Azure services, Experience with Azure DevOps Boards and Pipelines, Experience in production environment support and log analysis, Ability to work with high-level or ambiguous user stories, Knowledge of Lean methodologies 📃 Skills: C#, .NET, ASP.NET, Azure, ApplicationInsights, LogAnalytics, KeyVault, APIM, RBAC, ManagedIdentity, AzureDevOps, Docker, Kubernetes, ArgoCD, IdentityServer, OpenIddict, OIDC, PostgreSQL, AzureStorage 🏢 Description: We are seeking a skilled .NET Developer to contribute to the development, support, and maintenance of a web self-service platform utilized by multiple entities of our client. This role focuses on enhancing the Group’s self-service portal, aiming to increase customer engagement across various countries. Responsibilities Develop new features and maintain the existing web self-service portal to meet client requirements. Provide ongoing support and troubleshooting for production environments, analyzing logs to track and resolve issues effectively. Collaborate with cross-functional teams to implement solutions aligned with technical and business objectives. Work with high-level, sometimes ambiguous, user stories using Lean methodologies to deliver valuable outcomes. Participate in technical discussions and provide recommendations both at the technical and end-user level. Qualifications Proven experience with ASP .NET Core development. Proficiency in Azure services, including Application Insights, Log Analytics, Key Vault, API Management, Role-Based Access Control (RBAC), and Managed Identity. Experience with Azure DevOps tools such as Boards and Pipelines. Knowledge of production environment maintenance and issue tracking based on logs. Familiarity with Lean work principles, particularly handling vague or high-level task descriptions. Desirable skills include experience with Docker, Kubernetes, ArgoCD, Identity Server, OpenIddict, OIDC flow, payment provider integrations, PostgreSQL, and Azure Storage Account Tables. Strong communication skills to discuss and provide advice on both technical matters and end-user considerations. Benefits Opportunity to work on a high-impact self-service portal used by customers across multiple countries. Engagement in a technically diverse environment with exposure to modern cloud and DevOps technologies. Collaborative and structured project stages including preliminary acceptance, telephone and formal interviews, assessment, and offer phases. Remote work. Unique TEAL culture, relationship- and respect-driven community, non-corporate atmosphere. Agile approach and no bureaucracy. Outstanding integration trips to various places in Europe for all employees. Activities to support your well-being and health. Luxmed Gold Extended medical care and Multisport Plus benefit.

🏢 Summary: Offer for an experienced .NET Developer to design, develop and maintain modern banking and financial systems based on microservices architecture and Microsoft Azure cloud. The role focuses on high-quality software development using DDD and CQRS principles in Agile environments. 🗂️ Requirements: 3–4 years of commercial experience as .NET Developer, Very good knowledge of .NET Core, Experience with DDD and CQRS, Practical experience with Entity Framework, Experience with MS SQL Server and T-SQL, Knowledge of Microsoft Azure cloud services, Experience with Apache Kafka or RabbitMQ, Knowledge of design patterns and coding best practices, Experience working in Agile/Scrum, English level B2–C1 📃 Skills: .NET, .NETCore, C#, DDD, CQRS, EntityFramework, MSSQL, T-SQL, Azure, Kafka, RabbitMQ, Microservices, ASP.NET, Oracle, PostgreSQL, Angular, TypeScript, RxJS, CSS, Docker, Kubernetes, Scrum 🏢 Description: O projekcie Poszukujemy doświadczonego .NET Developera do realizacji projektów dla sektora bankowego i finansowego. Osoba na tym stanowisku będzie odpowiedzialna za projektowanie, rozwój oraz utrzymanie nowoczesnych systemów opartych o architekturę mikroserwisową i rozwiązania chmurowe. Jeżeli cenisz wysoką jakość kodu, nowoczesne podejście do tworzenia oprogramowania oraz chcesz pracować przy rozwoju systemów o kluczowym znaczeniu biznesowym – zapraszamy do aplikowania. Twój zakres obowiązków Projektowanie, rozwój i utrzymanie aplikacji opartych o platformę .NET Tworzenie i rozwijanie rozwiązań zgodnych z zasadami DDD oraz CQRS Implementacja i rozwój usług oraz integracji systemowych Projektowanie i optymalizacja baz danych Współpraca z zespołami analitycznymi, testerskimi oraz DevOps Tworzenie dokumentacji technicznej Udział w code review oraz dbanie o wysoką jakość dostarczanego oprogramowania Współpraca w środowisku Agile/Scrum Nasze wymagania Minimum 3–4 lata doświadczenia komercyjnego na stanowisku .NET Developer Bardzo dobra znajomość .NET Core Doświadczenie w projektowaniu aplikacji zgodnie z podejściem DDD (Domain-Driven Design) oraz CQRS Praktyczna znajomość Entity Framework Doświadczenie w pracy z MS SQL Server oraz T-SQL Znajomość usług chmurowych Microsoft Azure Doświadczenie w integracji systemów z wykorzystaniem Apache Kafka i/lub RabbitMQ Znajomość dobrych praktyk programistycznych oraz wzorców projektowych Umiejętność pracy zespołowej i samodzielnego rozwiązywania problemów Znajomość języka angielskiego na poziomie B2–C1 Mile widziane Doświadczenie w pracy z ASP.NET MVC Znajomość baz danych Oracle oraz PostgreSQL Doświadczenie frontendowe z Angular Znajomość TypeScript, RxJS oraz CSS Doświadczenie w pracy z Docker Znajomość Kubernetes Doświadczenie w projektach dla sektora bankowego lub finansowego Znajomość architektury mikroserwisowej i systemów rozproszonych Oferujemy Udział w zaawansowanych projektach dla sektora bankowego i finansowego Możliwość pracy zdalnej lub hybrydowej Elastyczne godziny pracy Stabilną współpracę przy długoterminowych projektach Możliwość rozwoju kompetencji w obszarze architektury systemów, chmury i nowoczesnych technologii .NET Dostęp do nowoczesnych narzędzi i technologii Współpracę z doświadczonym zespołem ekspertów IT Atrakcyjne wynagrodzenie adekwatne do doświadczenia i kompetencji Jeżeli chcesz rozwijać nowoczesne rozwiązania technologiczne, pracować z architekturą opartą o DDD, CQRS i chmurę Azure oraz realizować projekty o dużej skali biznesowej – zapraszamy do aplikowania.

🏢 Summary: Long-term fully remote B2B contract for a .NET Developer focused on maintaining and developing applications based on .NET Framework 4.7 and WinForms. The role involves designing, optimizing, deploying, and supporting software solutions in production environments. The position emphasizes system improvement, code quality, and close collaboration within cross-functional teams. 🗂️ Requirements: Experience with .NET Framework (preferably 4.7), Experience with WinForms, Strong knowledge of SQL, Strong knowledge of Entity Framework, Experience in application deployment, Experience in production support, Ability to maintain and optimize existing systems, Experience in code refactoring and code quality improvement, Experience with technical documentation, Familiarity with Jira or similar issue-tracking tools, Strong debugging skills 📃 Skills: .NET, WinForms, SQL, EntityFramework, Jira, Debugging, Refactoring 🏢 Description: We are looking for a .NET Developer : Key Details: Long-term B2B contract (140–170 PLN/hour) Fully remote work Tech stack: .NET Framework (mainly 4.7), WinForms, SQL, Entity Framework Requirements: Experience with .NET Framework (preferably version 4.7) and WinForms Strong knowledge of SQL and Entity Framework Ability to design and develop software solutions aligned with user needs Experience with deploying applications and supporting them in production environments Skills in maintaining, improving, and optimizing existing systems (performance, security, functionality) Ability to collaborate effectively with cross-functional teams (engineers, designers, analysts, Product Managers) Experience in writing and maintaining technical documentation Familiarity with Jira or similar tools for tracking issues and feedback Experience with refactoring code and improving code quality Willingness to share knowledge and support team development Strong debugging and problem-solving skills to ensure application stability and reliability

🏢 Summary: Hybrid Regular .NET Developer role focused on building and maintaining IT solutions for the financial sector, including Oracle-based systems and web applications. The position involves software development, system design, testing, documentation, and collaboration with business users and external vendors. Candidates should have strong experience with .NET technologies, SQL, web development, and enterprise-scale financial systems. 🗂️ Requirements: Very good knowledge of .NET framework, Ability to work with LLMs, Minimum 3 years of experience with C# and .NET, Experience with WCF, Experience with SQL and SSIS, Knowledge of ASP.NET MVC, Proficiency in JavaScript, Proficiency in jQuery, Proficiency in HTML5 and CSS3, Experience with Visual Studio Ultimate 2013, Knowledge of unit testing and test automation, Experience developing web applications, Understanding of OOP principles and design patterns, Experience designing IT systems for financial institutions or enterprise environments, Ability to analyze business and system requirements, English proficiency for technical documentation 📃 Skills: .NET, C#, WCF, SQL, SSIS, HTML, HTML5, ASP.NET, MVC, JavaScript, jQuery, CSS3, VisualStudio, OOP, LLM, Oracle, PLSQL, UML, ITIL, AGILE, XP 🏢 Description: .NET Developer (Regular) Financial Technology Sector | Hybrid Work (Łódź, Poland) Work Model: Hybrid (On-site 2 times a month in Łódź) Role Overview & Responsibilities We are seeking a skilled Regular .NET Developer to join our team and build high-quality IT solutions for the financial sector. In this role, you will be responsible for: Conducting design and implementation work in IT systems (including Oracle-based technologies). Collaborating with end/business users to gather and analyze data requirements for new solutions, specifically detailing general tasks and business concepts. Actively participating in internal software testing. Creating and updating technical and functional system documentation. Cooperating in the development of new solutions and defining technical directions. Implementing actions to improve data quality in systems and applications exporting data to the data warehouse. Supporting the review of technical specifications, as well as project, technical, and administrative documentation prepared by third-party vendors. Key Requirements Absolute Must-Haves: Very good knowledge of the .NET framework. Ability to work with Large Language Models (LLMs) . Strong teamwork skills combined with high independence. Experience & Technical Skills: Minimum 3 years of programming experience in IT projects using C#, .NET (including v4.5), WCF, SQL, SQL Server Integration Services (SSIS), HTML, and ASP.NET MVC. Proficiency in JavaScript, jQuery, jQuery UI, HTML5, and CSS3. Familiarity with Visual Studio Ultimate 2013. Knowledge of unit testing and the test automation process. Proven experience in developing web applications. Strong understanding of Object-Oriented Programming (OOP) principles and design patterns. Practical experience designing and programming IT systems for financial institutions (or similar enterprise environments in terms of scale, complexity, and quality standards). Soft Skills & Competencies: High degree of independence, goal orientation, and consistency in task execution. Excellent work organization, fast learning ability, and teamwork skills. Knowledge of business and system requirements analysis, specifically analytical thinking and precise communication. Ability to effectively cooperate with business clients, internal stakeholders, and external suppliers. High communication skills, natural inquisitiveness, and negotiation abilities. English proficiency sufficient for freely working with technical documentation and literature. Nice to Have Understanding of basic UX design principles. Familiarity with AGILE and XP methodologies. Knowledge of PL/SQL and Oracle databases. Practical knowledge of at least one CASE tool (e.g., Sparx Systems Enterprise Architect) and UML. Experience working in a matrix organizational structure. Familiarity with ITIL best practices.

🏢 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