Senior .NET (Web) (m/f/n)

🏢 Summary: Long-term remote contract for a Senior .NET Web Developer combining system development, maintenance, and flexible after-hours/weekend support for a CRM system built on AWS. The role focuses primarily on coding and maintaining existing functionalities, with additional monitoring and on-call duties aligned with US team hours. The position requires night shifts and weekend availability after the onboarding period. 🗂️ Requirements: Senior-level experience in .NET Web development, Strong experience with ASP.NET Web API, Experience with AWS (CDK, Lambda), Experience with SQL databases (SQL Server, PostgreSQL), Experience with Kafka, Experience with Docker, Experience with GitHub Actions, Experience with Terraform, Knowledge of design patterns, Fluent English (minimum B2), Availability for night shifts and weekend on-call support 📃 Skills: .NET, ASP.NET, WebAPI, AWS, CDK, Lambda, SQL, SQLServer, PostgreSQL, Kafka, Docker, GitHubActions, Terraform, DesignPatterns 🏢 Description: Senior .NET (Web) Developer (Night Shifts & Support) Dla naszego Klienta poszukujemy doświadczonego Senior .NET Developer do pracy w modelu łączącym rozwój oprogramowania, utrzymanie oraz elastyczne wsparcie po godzinach / w weekendy. Kluczowe informacje o projekcie: Start: ASAP (od zaraz) Długość współpracy: Kontrakt 12+ miesięcy (długofalowa współpraca) Model pracy: Maintenance + Development + Flexible after-hours/weekend support Lokalizacja: 100% zdalnie Tech Stack .NET (Web), ASP.NET Web API AWS (CDK, Lambdas) SQL, SQL Server, PostgreSQL Kafka Docker GitHub Actions Terraform Design Patterns (Wzorce projektowe) Model pracy i kluczowe oczekiwania Elastyczny grafik po godzinach: Gotowość do pracy w niestandardowych godzinach, w tym częściowe pokrycie czasu pracy z zespołem z USA (dokładne godziny do ustalenia indywidualnie). Dostępność weekendowa: Praca w weekendy w mieszanym systemie monitoringu oraz dyżurów (on-call) – ostateczna struktura zostanie dopasowana wspólnie z wybranym kandydatem. Rozwój systemu to podstawa: Monitoring i dyżury (on-call) nie są Twoim głównym obowiązkiem. Do Twoich kluczowych zadań należeć będzie regularne pisanie kodu (development) oraz utrzymanie systemu (maintenance). Przykładowy grafik: Poniedziałek – Piątek: 20:00 – 03:00 czasu polskiego (odpowiednik 2 pm – 9 pm ET) – aktywny monitoring rozłożony w ramach zmian zespołu. Sobota: 15:00 – 23:00 czasu polskiego (9 am – 5 pm ET): aktywny monitoring, 23:00 – 03:00 czasu polskiego (5 pm – 9 pm ET): dyżur pod telefonem (on-call) na wypadek pilnych awarii. Niedziela: 15:00 – 23:00 czasu polskiego (9 am – 5 pm ET): dyżur pod telefonem (on-call). *Pierwszy miesiąc wdrożenia (onboarding) odbywa się w standardowych godzinach: 9:00 – 17:00 czasu polskiego. Dostępność weekendowa wchodzi w życie dopiero po kilku miesiącach współpracy. Uwaga: Ostateczny harmonogram zostanie dostosowany i elastycznie dopasowany do potrzeb Twoich oraz zespołu po zakończeniu okresu wdrożenia. Twoje zadania Rozwój oraz bieżące utrzymanie istniejących funkcjonalności w systemie CRM. Rozszerzenie okna wsparcia technicznego dla systemów Klienta. Obsługa zgłoszeń po godzinach (after-hours) oraz szybkie reagowanie na krytyczne i pilne awarie (urgent issues). Praca z nowoczesną architekturą chmurową opartą o AWS. Wymagania i oczekiwania Bardzo dobra znajomość języka angielskiego (minimum B2) – warunek konieczny (płynna komunikacja w mowie i piśmie, codzienna współpraca z zespołem z USA). Silne kompetencje techniczne (Senior level) i wyjątkowe umiejętności rozwiązywania problemów (problem-solving). Gotowość do pracy w elastycznych godzinach popołudniowych/nocnych oraz w wybrane weekendy (zgodnie z ustalonym grafikiem).

🏢 Summary: Senior .NET (Web) Developer role combining development and maintenance of a CRM system with flexible after-hours and weekend support in a 100% remote model. The position involves working with AWS-based cloud architecture and collaborating with a US team during overlapping hours. Long-term contract focused primarily on coding and system enhancement, with additional on-call responsibilities. 🗂️ Requirements: Senior-level experience in .NET web development, Experience with ASP.NET Web API, Experience with AWS cloud services, Experience with SQL databases, Ability to work flexible evening/night hours, Availability for weekend on-call support, English proficiency at minimum B2 level, Strong problem-solving skills 📃 Skills: .NET, ASP.NET, WebAPI, AWS, CDK, Lambda, SQL, SQLServer, PostgreSQL, Kafka, Docker, GitHubActions, Terraform, DesignPatterns 🏢 Description: co.brick talents — powered by AI, powered by people. Senior .NET (Web) Developer (Night Shifts & Support) Dla naszego Klienta poszukujemy doświadczonego Senior .NET Developer do pracy w modelu łączącym rozwój oprogramowania, utrzymanie oraz elastyczne wsparcie po godzinach / w weekendy. Kluczowe informacje o projekcie: Start: ASAP (od zaraz) Długość współpracy: Kontrakt 12+ miesięcy (długofalowa współpraca) Model pracy: Maintenance + Development + Flexible after-hours/weekend support Lokalizacja: 100% zdalnie Tech Stack .NET (Web), ASP.NET Web API AWS (CDK, Lambdas) SQL, SQL Server, PostgreSQL Kafka Docker GitHub Actions Terraform Design Patterns (Wzorce projektowe) Model pracy i kluczowe oczekiwania Elastyczny grafik po godzinach: Gotowość do pracy w niestandardowych godzinach, w tym częściowe pokrycie czasu pracy z zespołem z USA (dokładne godziny do ustalenia indywidualnie). Dostępność weekendowa: Praca w weekendy w mieszanym systemie monitoringu oraz dyżurów (on-call) – ostateczna struktura zostanie dopasowana wspólnie z wybranym kandydatem. Rozwój systemu to podstawa: Monitoring i dyżury (on-call) nie są Twoim głównym obowiązkiem. Do Twoich kluczowych zadań należeć będzie regularne pisanie kodu (development) oraz utrzymanie systemu (maintenance). Przykładowy grafik: Poniedziałek – Piątek: 20:00 – 03:00 czasu polskiego (odpowiednik 2 pm – 9 pm ET) – aktywny monitoring rozłożony w ramach zmian zespołu. Sobota: 15:00 – 23:00 czasu polskiego (9 am – 5 pm ET): aktywny monitoring, 23:00 – 03:00 czasu polskiego (5 pm – 9 pm ET): dyżur pod telefonem (on-call) na wypadek pilnych awarii. Niedziela: 15:00 – 23:00 czasu polskiego (9 am – 5 pm ET): dyżur pod telefonem (on-call). *Pierwszy miesiąc wdrożenia (onboarding) odbywa się w standardowych godzinach: 9:00 – 17:00 czasu polskiego. Dostępność weekendowa wchodzi w życie dopiero po kilku miesiącach współpracy. Uwaga: Ostateczny harmonogram zostanie dostosowany i elastycznie dopasowany do potrzeb Twoich oraz zespołu po zakończeniu okresu wdrożenia. Twoje zadania Rozwój oraz bieżące utrzymanie istniejących funkcjonalności w systemie CRM. Rozszerzenie okna wsparcia technicznego dla systemów Klienta. Obsługa zgłoszeń po godzinach (after-hours) oraz szybkie reagowanie na krytyczne i pilne awarie (urgent issues). Praca z nowoczesną architekturą chmurową opartą o AWS. Wymagania i oczekiwania Bardzo dobra znajomość języka angielskiego (minimum B2) – warunek konieczny (płynna komunikacja w mowie i piśmie, codzienna współpraca z zespołem z USA). Silne kompetencje techniczne (Senior level) i wyjątkowe umiejętności rozwiązywania problemów (problem-solving). Gotowość do pracy w elastycznych godzinach popołudniowych/nocnych oraz w wybrane weekendy (zgodnie z ustalonym grafikiem).

🏢 Summary: Remote B2B opportunity for a Senior .NET Developer to build and maintain scalable enterprise web applications and SaaS platforms using modern Microsoft and cloud technologies. The role involves REST API development, automated testing, Agile collaboration, and participation in architectural and technical planning activities. 🗂️ Requirements: 6+ years of software development experience, Experience building and maintaining large web applications, Experience with SaaS solutions, Strong knowledge of C#, Strong knowledge of .NET Core, Strong knowledge of .NET Framework, Knowledge of REST architecture, Experience creating WebAPI services, Experience with NUnit, Experience with Moq, Experience with Jest, Practical knowledge of Git 📃 Skills: C#, .NET, .NETCore, .NETFramework, REST, WebAPI, NUnit, Moq, Jest, Git, Azure, AzureDevOps, SaaS, CI/CD, DevOps, SAFe, Agile 🏢 Description: Senior .NET Developer 📍 Lokalizacja: Zdalnie 📅 Forma współpracy: B2B - 900-1100 PLN/MD O projekcie Poszukujemy doświadczonych Senior .NET Developerów, którzy dołączą do zespołu rozwijającego skalowalne, bezpieczne i wydajne aplikacje webowe oraz rozwiązania SaaS. To doskonała okazja dla osób, które chcą pracować przy projektach klasy enterprise, wykorzystując nowoczesne technologie Microsoft i rozwiązania chmurowe. Zakres obowiązków Projektowanie, rozwój i utrzymanie dużych aplikacji webowych oraz platform SaaS. Współpraca z zespołami wielofunkcyjnymi w środowisku Agile. Tworzenie i rozwój REST API oraz usług webowych. Pisanie i utrzymywanie testów jednostkowych z wykorzystaniem NUnit, Moq oraz Jest. Udział w code review, dyskusjach architektonicznych oraz planowaniu technicznym. Praca z systemem kontroli wersji Git oraz Azure DevOps. Wymagania Minimum 6 lat doświadczenia w tworzeniu oprogramowania. Doświadczenie w budowie i utrzymaniu dużych aplikacji webowych oraz rozwiązań SaaS. Bardzo dobra znajomość: C# .NET Core .NET Framework Dobra znajomość architektury REST oraz tworzenia WebAPI. Doświadczenie z frameworkami testowymi: NUnit, Moq, Jest. Praktyczna znajomość Git. Mile widziane Doświadczenie w pracy w środowisku SAFe Agile. Znajomość procesów CI/CD oraz praktyk DevOps. Umiejętność rozwiązywania złożonych problemów technicznych. Dobre umiejętności komunikacyjne. Doświadczenie w mentoringu młodszych programistów i wspieraniu rozwoju zespołu.

🏢 Summary: Senior .NET Developer role focused on building and architecting cloud-native backend systems with AWS and CI/CD automation. The position involves designing microservices-based solutions, writing high-quality testable code, and contributing across the full project lifecycle in a spec-driven environment. Fully remote B2B contract with long-term cooperation potential. 🗂️ Requirements: Experience with modern .NET / .NET Core, Experience with AWS or Azure, Knowledge of microservices architecture, Knowledge of distributed systems, Ability to design system architecture, Experience writing integration tests, Experience writing end-to-end tests, Familiarity with BDD approach, Experience with CI/CD automation 📃 Skills: .NET, NETCore, AWS, Azure, CI/CD, Microservices, DistributedSystems, C#, BDD, IntegrationTesting, E2ETesting, Architecture 🏢 Description: Join an international IT company specializing in cloud services, managed services, and digital transformation for enterprises. As a Senior .NET Developer with a focus on AWS and CI/CD automation, you will participate in the project by providing backend support to the Tech Lead and a team. Key responsibilities Designing and architecting system components, Writing high-quality, testable code in .NET, Contributing to the development of modern cloud-native solutions, Working across the full project lifecycle (from discovery to delivery), Participating in planning and analysis (discovery, planning), Working in a “spec-driven” approach (based on specifications), Co-creating and refining specifications, acceptance criteria, and architectural decisions. Ideal candidate profile Experience with . NET (Core / modern .NET), Azure or AWS , Knowledge of architecture: microservices, distributed systems, Ability to translate business requirements into technical architecture, Writing integration and end-to-end tests, Familiarity with BDD (Behavior-Driven Development) approach. Conditions Type of cooperation: B2B contract Initial contract duration: 1st June- End of February 2027, with the intention to extend the cooperation or move top performers to another project. Rate: 130 - 160 PLN/h Benefits: Private healthcare, Multisport card and life insurance Work model: 100% remote from any location in Poland Recruitment steps Phone call with a Recruiter - Oliwia (approx. 20 min.) Interview with Client : Introductory conversation with the delivery team: review of your experience vs project needs, light technical questions, and verification of your comfort in a fully English‑speaking, international environment. Introductory interview : discussion of experience in relation to project requirements, technical questions. Final technical interview with Client : in‑depth technical questions, possibly practical task to see how you think, ask questions, and structure solutions. Decision and feedback

🏢 Summary: Senior .NET Developer role focused on building and maintaining extended functionalities within a distributed, cloud-based system. The position involves working with modern .NET technologies, Angular, cloud platforms, and microservices architecture in an Agile/Scrum environment. The role requires close collaboration with stakeholders while applying clean code and best development practices. 🗂️ Requirements: Bachelor’s degree or Microsoft .NET certification, Strong experience with .NET and C#, Experience with ASP.NET Core and Web API, Experience with Angular (2+), Experience with Azure or AWS, Experience with microservices and distributed systems, Experience with PostgreSQL and SQL Server, Experience with database migrations, Experience with GitHub, Knowledge of SOLID and DRY principles, Fluent English (written and spoken) 📃 Skills: .NET, C#, ASP.NET, Angular, Azure, AWS, Microservices, Kafka, PostgreSQL, SQL, GitHub, WebAPI 🏢 Description: We are looking for a Senior .Net Developer . Responsibility: Develop and maintain extended functionalities Collaborate closely with internal and external consultants, as well as key business stakeholders Work with technologies including Angular (2+), Azure/AWS Cloud, and the .NET stack (.NET 8/9, ASP.NET Core, C#, Web API), along with microservices and distributed systems, Kafka (or similar messaging tools), and databases such as PostgreSQL and SQL Server Actively participate in daily stand-ups, sprint reviews, and planning sessions with Danish colleagues, contributing to continuous improvement of the Scrum process To succeed in this role, you: Hold a relevant bachelor’s degree or a Microsoft certification related to .NET Apply clean code principles and best practices such as SOLID and DRY, with a strong object-oriented mindset Have proven experience in Microsoft .NET (C#), GitHub, PostgreSQL, and database migrations Communicate fluently in English, both written and spoken

🏢 Summary: The offer is for a Senior .NET Developer responsible for improving and refactoring core backend systems to enhance structure, maintainability, and security. The role focuses on reducing technical debt, enabling automation and AI integration, and ensuring high code quality through testing and CI/CD practices. The position involves hands-on development within legacy or monolithic environments and driving system modernization. 🗂️ Requirements: 5+ years experience in .NET / C# backend development, Experience with legacy or monolithic systems, Strong knowledge of clean code principles, Proven experience in refactoring existing codebases, Strong SQL and backend integration experience, Experience with APIs and service-based architecture, Experience with CI/CD pipelines, Experience with automated testing, Familiarity with TDD or BDD practices, Experience with Gherkin, SpecFlow, Cucumber or similar, Experience using AI tools in development workflows, Understanding of code structuring for automation and AI integration 📃 Skills: .NET, C#, SQL, APIs, CI/CD, TDD, BDD, Gherkin, SpecFlow, Cucumber, AI, Git, Docker, .NETCore 🏢 Description: Introduction & Summary: We are seeking a Senior .NET Developer with 5-8+ years of experience in backend development and .NET engineering. The successful candidate will drive improvement in code quality, reduce technical debt, and support system structuring for better predictability. With a focus on future automation and AI capabilities, you will help ensure code understandability, maintainability, and security. Main Responsibilities: Responsible for hands-on development and refactoring of core systems, with the aim of enhancing their structure and predictability. Develop and improve .NET-based systems. Reduce technical debt and increase maintainability. Support safe and efficient delivery. Ensure code is understandable, maintainable, and secure. Make systems testable and observable. Facilitate automation of workflows. Key Requirements: Strong experience with .NET / C#. Experience working with legacy or monolithic systems. Strong understanding of clean code principles. Experience with refactoring and improving existing codebases. Strong SQL and backend integration experience. Experience with APIs and service-based architecture. Experience with CI/CD pipelines. Experience with automated testing. Familiarity with TDD / BDD and security by design thinking. Experience with Gherkin / SpecFlow / Cucumber or similar. AI-related: Experience using AI tools in development workflows. Understanding of code structuring for automation and AI integration. Experience using AI for debugging, testing, or documentation support. Nice to Have: Experience with .NET Core. Experience with containerization. Exposure to AI-assisted testing or development tools. Experience improving system observability.

🏢 Summary: Backend Developer (.NET) role in a long-term enterprise project focused on development and maintenance of large-scale business systems. The position involves designing and implementing new features, optimizing existing solutions, and ensuring high performance and stability. Hybrid work model with strong emphasis on code quality and system reliability. 🗂️ Requirements: Experience with C#, Knowledge of .NET Core / .NET 6+, Experience with ASP.NET / ASP.NET Core (MVC, Web API), Experience with Entity Framework / EF Core (migrations, query optimization), Experience with MS SQL Server (T-SQL, stored procedures, indexes, optimization), Experience with migration scripts and Entity Framework, Experience with SQL Server Agent Jobs, Knowledge of HTML5 and CSS3, Experience with JavaScript and jQuery, Knowledge of Bootstrap, Experience with IIS configuration and manual deployments, Ability to monitor logs and diagnose errors, Knowledge of Windows Server, Experience with REST and SOAP, Knowledge of JSON and XML, Experience with GIT 📃 Skills: C#, .NET, ASP.NET, MVC, WebAPI, EF, SQL, TSQL, MSSQL, HTML5, CSS3, JavaScript, jQuery, Bootstrap, IIS, WindowsServer, REST, SOAP, JSON, XML, GIT 🏢 Description: Dla naszego klienta poszukujemy Backend Developera (.NET) do długoterminowego projektu związanego z rozwojem i utrzymaniem systemów biznesowych o dużej skali. Rola obejmuje projektowanie i rozwój nowych funkcjonalności, optymalizację istniejących rozwiązań oraz współpracę z zespołami frontendowymi i infrastrukturalnymi. Projekt realizowany jest w środowisku enterprise, z naciskiem na jakość kodu, wydajność oraz stabilność systemów. Tryb pracy Praca hybrydowa: 3 dni pracy zdalnej 2 dni pracy w biurze w Warszawie Start Od zaraz (możliwość dopasowania terminu rozpoczęcia dla odpowiedniego kandydata) Wymagane kompetencje Backend / .NET Wymagane: C#, .NET Core / .NET 6+ ASP.NET / ASP.NET Core (MVC, Web API) Entity Framework / EF Core (migracje, optymalizacja zapytań) Mile widziane: .NET Framework 4.8 REST / SOAP Programowanie asynchroniczne i wielowątkowe Znajomość zasad SOLID i wzorców projektowych WCF, WinForms, WPF Office Interop / COM Interop Bazy danych Wymagane: MS SQL Server (T-SQL, procedury składowane, indeksy, optymalizacja) Skrypty migracyjne, praca z Entity Framework SQL Server Agent Jobs (harmonogramowanie i automatyzacja zadań) Mile widziane: SSIS (ETL) SAS, PostgreSQL, Oracle, Teradata Frontend Wymagane: HTML5, CSS3 JavaScript, jQuery Bootstrap DevOps / Utrzymanie Wymagane: IIS (konfiguracja, wdrożenia manualne) Monitorowanie logów i diagnostyka błędów Windows Server Mile widziane: WPF / WinForms (aplikacje desktopowe) Podstawy UNIX Dodatkowe kompetencje Komunikacja międzyserwisowa (REST, SOAP, JSON, XML) GIT

🏢 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: Senior .NET Backend Engineer role focused on building modern API and event-driven integrations for research systems in the pharmaceutical industry. The position involves replacing legacy APIs, implementing cloud-based integration solutions, and supporting event-driven architecture initiatives in a remote or hybrid B2B setup. Long-term contract with English-speaking environment and collaboration with technical and business stakeholders. 🗂️ Requirements: Strong experience with .NET, Experience with ASP.NET Core, Experience building enterprise integration APIs, Knowledge of Azure or AWS, Experience with Infrastructure as Code, Hands-on experience with Entity Framework, Experience with unit testing, Knowledge of software quality practices, Strong analytical and problem-solving skills, Ability to work independently, Excellent communication skills, Confidence working with stakeholders 📃 Skills: .NET, ASP.NET, Azure, AWS, Bicep, EntityFramework, Kafka, Redis, Docker, CI/CD, GitHub, APIs 🏢 Description: 🌍Work mode - fully remote or hybrid - 2 days from the office in Warsaw. 📑 Assignment type : B2B ⏳Contract length >10-12 months + extensions. ⏰Start - ASAP/1 month. 📕Language - English. ⚙️Industry - pharmaceutical. 💼 Recruitment process - 2 interviews with the client. 💻 Workload : Full time. Summary: The Senior .Net Backend Engineer role is focused on building innovative integrations for research systems. The primary objective is to modernize data exchange mechanisms to enhance scientific work and accelerate innovation in research. Main Responsibilities: Build API and event-based integrations between existing and new research systems. Replace current legacy APIs with a new modern greenfield API surface. Assist feature teams with identifying and implementing event-driven architecture. Key Requirements: Strong experience developing backend applications using .NET / ASP.NET Core. Experience building enterprise integration APIs. Knowledge of cloud platforms such as Azure and/or AWS. Experience with Infrastructure as Code (e.g., Bicep). Hands-on experience with Entity Framework. Experience with unit testing and modern software quality practices. Strong analytical and problem-solving skills. Ability to work independently with a high degree of ownership and accountability. Excellent communication skills and confidence working directly with stakeholders. Nice to Have: Experience with Kafka. Knowledge of Electronic Laboratory Notebooks (ELN). Familiarity with Redis. Experience with Docker / Container Apps. Knowledge of CI/CD practices, GitHub Actions. Other Details: Team Context: Works closely with technical and business stakeholders in a collaborative environment.

🏢 Summary: Senior .NET Backend Engineer role focused on building modern API and event-driven integrations for research systems in the pharmaceutical industry. The position involves replacing legacy APIs, supporting event-driven architecture, and working with cloud-based enterprise integrations in a remote or hybrid B2B setup. Long-term full-time contract with English-speaking international collaboration. 🗂️ Requirements: Strong experience with .NET, Experience with ASP.NET Core, Experience building enterprise integration APIs, Knowledge of Azure or AWS, Experience with Infrastructure as Code, Hands-on experience with Entity Framework, Experience with unit testing, Knowledge of modern software quality practices, Strong analytical and problem-solving skills, Ability to work independently, Excellent communication skills, Confidence working with stakeholders 📃 Skills: .NET, ASP.NET, Azure, AWS, Bicep, EntityFramework, Kafka, Redis, Docker, CI/CD, GitHub, API 🏢 Description: 🌍Work mode - fully remote or hybrid - 2 days from the office in Warsaw. 📑 Assignment type : B2B ⏳Contract length >10-12 months + extensions. ⏰Start - ASAP/1 month. 📕Language - English. ⚙️Industry - pharmaceutical. 💼 Recruitment process - 2 interviews with the client. 💻 Workload : Full time. Summary: The Senior .Net Backend Engineer role is focused on building innovative integrations for research systems. The primary objective is to modernize data exchange mechanisms to enhance scientific work and accelerate innovation in research. Main Responsibilities: Build API and event-based integrations between existing and new research systems. Replace current legacy APIs with a new modern greenfield API surface. Assist feature teams with identifying and implementing event-driven architecture. Key Requirements: Strong experience developing backend applications using .NET / ASP.NET Core. Experience building enterprise integration APIs. Knowledge of cloud platforms such as Azure and/or AWS. Experience with Infrastructure as Code (e.g., Bicep). Hands-on experience with Entity Framework. Experience with unit testing and modern software quality practices. Strong analytical and problem-solving skills. Ability to work independently with a high degree of ownership and accountability. Excellent communication skills and confidence working directly with stakeholders. Nice to Have: Experience with Kafka. Knowledge of Electronic Laboratory Notebooks (ELN). Familiarity with Redis. Experience with Docker / Container Apps. Knowledge of CI/CD practices, GitHub Actions. Other Details: Team Context: Works closely with technical and business stakeholders in a collaborative environment.