Senior Backend .NET Developer

🏢 Summary: Backend Developer (.NET) role focused on building secure, scalable backend services, APIs, integrations, and digital portals for an insurance platform. The position includes authentication and authorization management, Azure API Management, OutSystems support, and production troubleshooting in a cross-functional team. 🗂️ Requirements: 4+ years of commercial .NET and C# development experience, REST API and backend-service development and integration experience, Hands-on Auth0 configuration and support experience, Authentication and authorization knowledge: OAuth 2.0, OpenID Connect, JWT, roles, permissions, Microsoft Azure experience, Azure API Management experience: routing, policies, authentication, integrations, Internal-system and third-party-service integration experience, Upper-Intermediate English or higher 📃 Skills: .NET, C#, REST, Auth0, OAuth, OpenID, JWT, Azure, OutSystems, Okta 🏢 Description: Andersen is hiring a Backend Developer (.NET) for a project developing scalable digital insurance platforms and delivering secure backend services and system integrations. The customer is an international insurance company operating across multiple countries, known for expertise in niche markets and commitment to high-quality service. With strong governance and transparent practices, it promotes a culture of innovation, diversity, and continuous learning. Recent achievements, including record financial results and recognition for customer service, highlight its resilience and long-term value creation. The project is focused on developing and enhancing customer- and agent-facing digital portals using .NET, OutSystems, and Azure technologies. It includes backend services, system integrations, API management, and secure authentication to deliver reliable and scalable digital experiences. Responsibilities: Developing, maintaining, and enhancing backend services and APIs using .NET. Configuring and supporting authentication and authorization flows using Auth0 and Okta. Maintaining Auth0 applications, APIs, connections, roles, permissions, rules, actions, and identity-provider integrations. Developing and supporting customer- and agent-facing functionality built with OutSystems. Configuring and maintaining API routing and policies in Azure API Management. Integrating portal applications with internal core systems and external services. Troubleshooting authentication, integration, API, and application issues across the technology stack. Collaborating with business analysts, architects, QA engineers, and other developers to translate business requirements into technical solutions. Participating in technical design discussions, code reviews, testing, deployment, and production support. Ensuring that solutions follow security, scalability, maintainability, and performance best practices. Contributing to improving development standards, documentation, and engineering processes. Must-haves: Strong commercial software development experience with .NET and C# for 4+ years. Experience developing and integrating REST APIs and backend services. Hands-on experience configuring and supporting Auth0. Good understanding of authentication and authorization concepts, including OAuth 2.0, OpenID Connect, JWT, roles, and permissions. Experience working with Microsoft Azure services. Practical knowledge of Azure API Management, including API routing, policies, authentication, and integrations. Experience integrating applications with internal systems and third-party services. Strong troubleshooting and problem-solving skills. Ability to work across different parts of the application stack. Good communication skills and the ability to collaborate with both technical and non-technical stakeholders. Level of English – from Upper-Intermediate and above. Nice-to-haves: Commercial experience developing applications with OutSystems; or a strong interest in learning OutSystems and willingness to work with it as a core part of the project. Experience with low-code application development platforms will be considered an advantage. Experience with Okta administration or integration. Experience with Azure Functions, App Services, Application Insights, or other Azure services. Knowledge of CI/CD pipelines and automated deployment processes. Experience working with customer-facing or agent-facing portals. Experience in the insurance or financial-services domain. Understanding of secure software development practices. Experience supporting production applications and investigating incidents. Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 EUR per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies). Certification compensation (AWS, PMP, etc). Referral program. Private health insurance and sports compensation, depending on the type of employment. Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy/pl Join us!

🏢 Summary: Senior Backend Software Engineer role focused on designing, building, and operating secure, scalable .NET microservices for cloud and hybrid environments. The position delivers backend features end to end using Azure services, SQL Server, Cosmos DB, asynchronous messaging, automated testing, and CI/CD practices. 🗂️ Requirements: 5+ years of backend or distributed systems engineering experience, Proficiency in C#, .NET 8/10, ASP.NET Core, and Azure Functions, Experience with SQL Server, T-SQL, EF Core, RLS, and NoSQL databases, Practical Azure services experience, Knowledge of OAuth2, JWT, and identity-provider integrations, Experience with multi-tenant SaaS architectures, Knowledge of asynchronous message-driven systems, Experience with CI/CD, Terraform, and Docker/Kubernetes, Strong unit and integration testing practices 📃 Skills: C#, .NET, ASP.NET, Azure, SQL, T-SQL, EF, CosmosDB, OAuth2, JWT, SaaS, CI/CD, Terraform, Docker, Kubernetes, xUnit, Moq, FluentAssertions, GitHub, Azurite 🏢 Description: We are looking for an experienced Senior Backend Software Engineer to design, build, and operate backend services within a modern, scalable microservices environment. The role involves working with ASP .NET Core, Azure Functions, SQL Server, and Azure CosmosDB to deliver high‑performance, secure solutions for cloud and hybrid environments. Key Responsibilities: ·       End‑to‑end development of backend features using ASP .NET Core APIs, Azure Functions, SQL Server, and CosmosDB ·       Building and extending .NET services in a microservices architecture ·       Implementing resilient, asynchronous workflows using Azure Service Bus ·       Designing secure and efficient data access patterns (SQL Server, CosmosDB) ·       Ensuring multi‑tenant data isolation and compliance with security standards ·       Using Azure services such as Service Bus, Blob Storage, App Configuration, Application Insights, and Entra ID ·       Writing unit and integration tests (xUnit, Moq, FluentAssertions) ·       Contributing to CI/CD pipelines (GitHub Actions, Azure DevOps) ·       Working with Terraform, Docker Compose, and Azurite ·       Identifying and resolving performance, security, and reliability issues ·       Independently delivering backend features from design to production ·       Participating in architecture discussions and code reviews ·       Collaborating with product and frontend teams on API design ·       Mentoring junior engineers and promoting AI‑driven development practices. Qualifications: ·       Minimum 5  years of experience in backend or distributed systems engineering ·       Strong proficiency in C# / .NET 8/10, ASP .NET Core, Azure Functions ·       Experience with SQL Server (T‑SQL, EF Core, RLS) and NoSQL databases (CosmosDB preferred) ·       Practical knowledge of Azure services (Functions, Service Bus, Blob Storage, App Configuration, App Insights) ·       Understanding of OAuth2, JWT, and identity provider integrations ·       Experience with multi‑tenant SaaS architectures ·       Familiarity with asynchronous, message‑driven systems ·       Knowledge of CI/CD, Terraform, Docker/Kubernetes ·       Strong testing discipline and communication skills. Benefits: ·       Health benefits & insurance ·       Multisport card ·       Learning and development opportunities ·       Flexible work schedule ·       Innovative work in cybersecurity and AI-native environment ·       Opportunities for career growth. Apply now!

🏢 Summary: Oferta dotyczy rozwoju backendu platformy telemetrycznej opartej na .NET Core i Azure Cloud, przetwarzającej dane flotowe w czasie rzeczywistym. Rola obejmuje tworzenie usług chmurowych i integracji IoT/API, rozwój API, wpływ na architekturę oraz usuwanie błędów, z codziennym wykorzystaniem narzędzi AI. 🗂️ Requirements: Minimum 2 lata komercyjnego doświadczenia w środowisku .NET, Efektywna praca z Claude Code, Cursor i GitHub Copilot, Umiejętność oceny i poprawy kodu generowanego przez AI, Język angielski na poziomie B2 📃 Skills: .NET, C#, Claude, Cursor, Copilot, Azure, TCP/IP, IoT, API 🏢 Description: W związku z dynamicznym rozwojem naszej firmy poszukujemy osoby na stanowisko Backend Developer (.NET/C#) with AI Mindset , dla której narzędzia AI (Claude Code, Cursor, Copilot) są naturalnym elementem codziennej pracy, a nie dodatkiem. Projekt dotyczy prężnie rozwijającej się platformy telemetrycznej , opartej w pełni o .NET Core oraz chmurę Azure Cloud . 🏗️ NAD CZYM PRACUJEMY Nasza platforma pokazuje operatorom flot pełny obraz tego, co dzieje się z ich pojazdami - na żywo i z dowolnego momentu w przeszłości. Brzmi prosto. W praktyce oznacza to strumień danych przychodzący bez przerwy, interfejs mapowy, który musi zostać płynny przy dużej liczbie obiektów, odtwarzanie wideo zsynchronizowane z resztą widoku i aplikację działającą w kilkunastu językach dla organizacji o złożonej strukturze. Druga strona produktu to konfiguracja i zgodność. Setki ustawień na poziomie organizacji, pojazdu, urządzenia i użytkownika, rozbudowany system ról i uprawnień, ślad audytowy każdej zmiany. Projektowanie formularzy, tabel i przepływów konfiguracyjnych to u nas realna praca inżynierska, a nie dodatek. To dojrzały produkt w aktywnym rozwoju. Nie zaczynasz od pustego repo, ale nie wchodzisz też w zamrożony legacy. ⚙️ PLATFORMA POZWOLI CI POZNAĆ Video streaming · Analizę video (AI) · Komunikację TCP/IP (IoT) · Big data · Azure Cloud 🛠️ GŁÓWNE ZADANIA • Tworzenie nowych serwisów procesujących dane w chmurze • Tworzenie integracji z usługami zewnętrznymi (urządzenia IoT / API) • Rozwój platformy po stronie API • Wpływ na architekturę systemu • Bug fixing ✅ WYMAGANIA • Efektywna praca z narzędziami AI ( Claude Code, Cursor, GitHub Copilot ) jako naturalny element workflow - rozumiesz architekturę na tyle, by ocenić i poprawić to, co generuje model • Przynajmniej 2 lata doświadczenia komercyjnego w środowisku .NET • Znajomość języka angielskiego na poziomie B2 (zespół międzynarodowy) 💡 MILE WIDZIANE • Znajomość Git • Znajomość Microsoft Azure • Doświadczenie z tworzeniem i użytkowaniem lokalnych modeli AI • Umiejętność automatyzacji procesów (np. CI/CD, automatyzacja zadań/skryptów) 📩 Chcesz dołączyć do zespołu? Wyślij swoje CV - czekamy na Ciebie!

🏢 Summary: Senior .NET Developer role on a long-term, fully remote B2B project for an insurance and reinsurance client. The position focuses on developing and modernizing business-critical applications for migration to Microsoft Azure, using .NET, Blazor, SQL Server, Azure Functions, and Azure DevOps. 🗂️ Requirements: 5+ years of commercial .NET development experience, Commercial C# and .NET experience, Commercial Blazor experience or strong Full Stack experience with willingness to learn Blazor, SQL Server experience, Microsoft Azure experience, Azure Functions experience, Azure DevOps experience, English proficiency at B2 level or higher, Independent, proactive work in an Agile environment, Strong problem-solving and ownership mindset 📃 Skills: C#, .NET, Blazor, SQLServer, Azure, AzureFunctions, AzureDevOps, Agile 🏢 Description: We are looking for an experienced Senior .NET Developer to join a long-term project delivered for a well-established UK-based client from the insurance and reinsurance sector. You will become part of an international delivery team responsible for developing and modernizing business-critical applications as part of the client's ongoing migration to the Microsoft Azure ecosystem. 📍 100% Remote (Poland) 🚀 Start: Beginning of August 📅 6-month contract with possible extension 💼 B2B Requirements: Minimum 5 years of commercial experience as a .NET Developer Strong hands-on experience with C# and .NET Commercial experience with Blazor (or strong Full Stack experience with willingness to learn Blazor) Experience working with SQL Server Practical experience with Microsoft Azure Experience developing Azure Functions Experience working with Azure DevOps Very good English communication skills (minimum B2 ) Ability to work independently and proactively in an Agile environment Strong problem-solving skills and ownership mindset Nice to have: Experience in the insurance or financial services industry Experience working in distributed international teams Knowledge of Scrum or Kanban Experience with application modernization or cloud migration projects Familiarity with legacy application modernization Responsibilities: Design, develop, and deliver software solutions based on business and technical requirements Develop and maintain applications using .NET, Blazor, SQL Server, and Microsoft Azure Build and maintain Azure Functions and cloud-based services Participate in technical discussions and contribute to solution design Collaborate closely with developers, testers, architects, Product Owners, and business stakeholders Ensure high-quality, maintainable, and scalable code Take ownership of assigned user stories from development through delivery Support the modernization of legacy applications into the Azure ecosystem Participate in Agile ceremonies and work closely with distributed international teams We offer: Up to 110 PLN/h net on B2B 100% remote work 14-day invoice payment terms Private healthcare package Access to the MyBenefit cafeteria platform (including MultiSport and gift cards) Long-term cooperation with an international UK client Opportunity to work on large-scale Azure modernization projects Collaborative environment with experienced engineering teams and modern development practices

🏢 Summary: Senior .NET Developer role focused on building and maintaining scalable back-end services for an electronic-component selection system and manufacturer database integrations. The position involves Azure and CosmosDB development, test automation, AI-assisted engineering, and close Agile collaboration with a US-based team. 🗂️ Requirements: 8+ years of .NET development experience, Senior-level problem-solving capabilities, C# experience, Azure cloud experience, CosmosDB experience, Practical use of AI development tools, Fluent English, Availability for daily meetings between 17:00 and 19:00 CET, Residence in Poland or eligibility to work in Poland 📃 Skills: .NET, C#, Azure, CosmosDB, Playwright, Selenium, GitHub, Copilot, ChatGPT, Cursor, Agile 🏢 Description: We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards. We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions. Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth. Join us as Senior .NET Developer Grow in an environment that cares about your development as much as you do. Your responsibilities Designing, developing, and maintaining high-performance back-end services using .NET and C# for an established, scalable system used for selecting electronic components and integrating with manufacturer databases. Working extensively with Azure cloud services and CosmosDB to build, maintain, and monitor resilient solutions. Setting up test automation structures and frameworks from scratch using tools like Playwright or Selenium . Actively leveraging AI coding assistants such as GitHub Copilot , ChatGPT , or Cursor to enhance productivity and troubleshooting, while proactively sharing AI-assisted development practices with the team. Collaborating directly with the US-based team in an Agile environment, actively participating in code reviews, sprint planning, and architectural discussions. Communicating with business stakeholders to understand requirements and translate them into effective technical solutions. Requirements Minimum 8 years of professional experience in .NET development, demonstrating a senior-level mindset and problem-solving capabilities. Experience with C# , the Azure cloud ecosystem, and CosmosDB . Practical experience in using modern AI tools in daily software development and a willingness to promote these practices. Fluency in English to ensure seamless communication with US managers and developers. Flexibility to align with US working hours, specifically attending daily meetings between 17:00 and 19:00 CET. You need to live in Poland and/or be eligible to work here. Nice to have: Background or interest in Electrical Engineering. General understanding of testing practices, CI/CD pipelines, and Git version control. Knowledge in TypeScript or JavaScript. What we offer 100% remote work Work in a Scandinavian culture built on logic and dialogue. Health and sports benefits tailored to your needs. Speed Coaching – short sessions that provide new perspectives and solutions. Sports training, an internal team, and opportunities to take part in competitions. Team events and development-focused meetups.

🏢 Summary: Backend .NET role focused on building and evolving a scalable digital real estate platform for property investment, financing, ownership, and management. The position involves designing service-oriented backend systems, improving performance and reliability, and collaborating across engineering teams in an agile environment. Remote, office, and hybrid work options are available, with professional development, certification support, and health-related benefits. 🗂️ Requirements: 4+ years of .NET development experience, Docker and Kubernetes experience, Azure services experience: Key Vault, App Configuration, queues, Azure AD B2C, RESTful APIs, microservices, and serverless computing knowledge, SQL and NoSQL database design experience, Caching strategies experience, Codebase architecture, code organization, and design patterns expertise, English proficiency: Intermediate+ 📃 Skills: C#, .NET, Docker, Kubernetes, Azure, KeyVault, AppConfiguration, ADBC2, REST, Microservices, Serverless, SQL, NoSQL, Caching, Debugging, Testing, Observability 🏢 Description: Andersen is hiring a Backend Developer (.NET) for a project developing a digital real estate platform and delivering scalable solutions for property management and investment. The customer is a technology company developing digital solutions that modernize complex business processes and improve customer experiences. Its integrated platform brings together multiple digital services into a seamless online experience, helping users manage a wide range of activities more efficiently. By leveraging innovative technologies, automation, and strategic partnerships, the company drives digital transformation while enhancing efficiency, transparency, and accessibility. The project is focused on developing a digital real estate platform that simplifies property investment, financing, and ownership. It combines fractional ownership, mortgage services, and property management capabilities into a single solution, making real estate more accessible and easier to manage throughout the entire ownership journey. Responsibilities: Designing and developing high-performance, scalable backend systems using C# and .NET technologies. Leading the design discussions and implementing best practices for service-oriented architectures and microservices. Driving the evolution of our existing platform to the next level by leveraging cutting-edge technologies and strategies to ensure a future-proof and scalable infrastructure. Ensuring high quality unit/integration tests where required. Identifying, troubleshooting, and resolving complex technical issues, with a strong emphasis on debugging skills. Optimizing system performance through proactive analysis, code reviews, and continuous improvement initiatives along with observability tooling. Mentoring junior engineers and sharing your deep technical expertise across teams. Collaborating with cross-functional teams including frontend developers, DevOps, QA, and product managers to deliver high-quality solutions. Contributing to agile processes and driving continuous improvement in development methodologies and practices. Staying updated with emerging technologies and industry trends, recommending new tools and practices to enhance the technical stack. Contributing to the technical strategy and roadmap of backend services. Must-haves: Experience with .NET development for 4+ years. Experience with containerization technologies such as Docker and orchestration platforms like Kubernetes. Experience with Azure cloud services like key vault, app config, various queueing products and ADB2C. Familiarity with RESTful APIs, microservices architecture, and serverless computing. Extensive database design experience with SQL and NoSQL. Extensive caching strategies and related experience. Command over codebase architecture and code organization with relevant design patterns. Level of English – from Intermediate+ and above. Nice-to-haves: Previously worked in a fintech/proptech industry. Knowledge of additional programming languages or frameworks is a plus. Certification(s) related to Azure or cloud technologies. Programming experience in a related language such as Golang, Typescript, etc AWS cloud native experience. Reasons why this job would be interesting to you: Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc.. The opportunity to change the project and/or develop expertise in an interesting business domain. Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant. Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee. The opportunity to earn up to an additional 1,000 EUR per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities. Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated. Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies). Certification compensation (AWS, PMP, etc). Referral program. Private health insurance and sports compensation, depending on the type of employment. Join us! Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy/pl

🏢 Summary: Senior .NET Developer role focused on building secure, scalable, cloud-native enterprise solutions on Azure. The position involves developing serverless applications, backend APIs, data integrations, and CI/CD-enabled delivery in an Agile, hybrid team environment. 🗂️ Requirements: 7+ years of professional software development experience, Hands-on C# and .NET Core/.NET 6+ experience, Azure Functions development and deployment experience, Azure Storage Accounts and Blob Storage expertise, Azure Key Vault expertise, Event-driven and asynchronous processing knowledge, OOP, design patterns, and SOLID principles knowledge, CI/CD pipeline experience with Azure DevOps or GitHub Actions, Agile/Scrum team experience, English communication skills 📃 Skills: C#, .NET, Azure, Functions, Blob, KeyVault, ServiceBus, AppServices, SQL, CosmosDB, CI/CD, DevOps, GitHub, ARM, Bicep, Terraform, OOP, SOLID, Agile, Scrum 🏢 Description: Location: Wroclaw, hybrid 3 days/week About the Role We are looking for an experienced and passionate Senior .NET Developer with strong Azure expertise to join our engineering team. In this role, you will design, develop, and enhance scalable digital products and technology services used by clients and internal teams worldwide. You will work in a modern cloud-native environment, contribute to high-impact projects, and collaborate with cross-functional teams to build secure, reliable, and highly available enterprise solutions. Key Responsibilities Design, develop, and deploy serverless applications using Azure Functions Build and optimize integrations with Azure Blob Storage for large-scale data handling Implement secure access and secrets management using Azure Key Vault Develop scalable backend services and APIs using .NET 6+ / .NET Core Apply software engineering best practices: code reviews, automated testing, and CI/CD Ensure security, reliability, and performance across all delivered solutions Troubleshoot production issues and contribute to system improvements Collaborate closely with cross-functional teams in an Agile environment Advocate for clean code, maintainable architecture, and technical excellence Required Skills & Experience 7+ years of professional software development experience Strong hands-on experience with C# and .NET Core / .NET 6+ Proven experience building and deploying Azure Functions (Durable Functions is a plus) Deep experience with Azure Storage Accounts and Blob Storage (containers, lifecycle management, access tiers) Strong experience with Azure Key Vault (secrets, certificates, access policies) Experience with other Azure services : Azure Service Bus Azure App Services / Web Apps Azure SQL / Cosmos DB (nice to have) Solid understanding of event-driven and async processing patterns Strong knowledge of OOP, Design Patterns, and SOLID principles Experience with CI/CD pipelines (Azure DevOps or GitHub Actions) Working knowledge of Infrastructure as Code (ARM / Bicep / Terraform) – nice to have Experience working in Agile / Scrum teams Strong analytical and problem-solving skills Excellent communication skills in English (Polish is a plus)