Senior .Net API Developer

🏢 Summary: Senior .NET API Developer role focused on designing and leading development of secure, scalable REST APIs within a Nordic commercial integration layer for Auto and Consumer Finance. The position involves end-to-end backend ownership, architectural collaboration, and enhancement of existing integration services in a cloud-based environment. Remote B2B contract on an international project. 🗂️ Requirements: Senior-level backend development experience, Proven experience leading development of applications and APIs, Strong architectural design capabilities, Experience with .NET and .NET Core, Hands-on experience with RESTful services, Experience implementing OAuth, Practical experience with Azure, Experience with Azure DevOps 📃 Skills: .NET, .NETCore, REST, OAuth, Azure, AzureDevOps, SQL, NoSQL, AKS, PowerShell, ApplicationInsights, SOLID 🏢 Description: Summary: The Senior .Net API Developer role focuses on developing and maintaining the Nordic commercial integration layer, enhancing secure and scalable integrations within the Auto and Consumer Finance space. The primary goal is to lead initiatives in backend API development while maintaining high standards of quality and technical stability. What we offer: Remote Role B2B Contract Big International project Rate: 160-180 zł/hour +VAT Responsibilities: Design and implement new external partner REST APIs Lead backend development initiatives from idea to production Translate complex business requirements into scalable technical solutions Contribute to architectural decisions in collaboration with the Architect Maintain and enhance existing integration services Improve performance, scalability, and reliability Produce and maintain technical documentation Ensure adherence to architectural guidelines and security standards Participate in agile ceremonies and technical discussions Key Requirements: Senior-level backend development experience Proven ability to lead development of new applications and APIs Strong architectural understanding and design capabilities Experience with .NET / .NET Core Hands-on knowledge of RESTful services and OAuth Technical expertise in Azure and Azure DevOps Nice to Have: Experience with Application Insights Knowledge of PowerShell Familiarity with Azure API Management Understanding of SQL/NoSQL databases Experience with AKS and SOLID principles

🏢 Summary: Senior .Net API Developer role focused on leading backend API development and enhancing secure, scalable integration services within the Nordic commercial integration layer in the Auto and Consumer Finance domain. The position involves designing and implementing REST APIs, contributing to architecture decisions, and ensuring high performance, reliability, and security standards. Remote B2B contract on an international project. 🗂️ Requirements: Senior-level backend development experience, Experience leading development of applications and APIs, Strong architectural design skills, Experience with .NET and .NET Core, Hands-on experience with RESTful APIs, Knowledge of OAuth, Experience with Azure, Experience with Azure DevOps 📃 Skills: .NET, .NET Core, REST, OAuth, Azure, Azure DevOps, SQL, NoSQL, AKS, PowerShell, Application Insights, SOLID 🏢 Description: Summary: The Senior .Net API Developer role focuses on developing and maintaining the Nordic commercial integration layer, enhancing secure and scalable integrations within the Auto and Consumer Finance space. The primary goal is to lead initiatives in backend API development while maintaining high standards of quality and technical stability. What we offer: Remote Role B2B Contract Big International project Rate: 160-180 zł/hour +VAT Responsibilities: Design and implement new external partner REST APIs Lead backend development initiatives from idea to production Translate complex business requirements into scalable technical solutions Contribute to architectural decisions in collaboration with the Architect Maintain and enhance existing integration services Improve performance, scalability, and reliability Produce and maintain technical documentation Ensure adherence to architectural guidelines and security standards Participate in agile ceremonies and technical discussions Key Requirements: Senior-level backend development experience Proven ability to lead development of new applications and APIs Strong architectural understanding and design capabilities Experience with .NET / .NET Core Hands-on knowledge of RESTful services and OAuth Technical expertise in Azure and Azure DevOps Nice to Have: Experience with Application Insights Knowledge of PowerShell Familiarity with Azure API Management Understanding of SQL/NoSQL databases Experience with AKS and SOLID principles

🏢 Summary: Senior .NET Developer role focused on building and enhancing a custom industrial application supporting end-to-end production and logistics processes. The position involves backend development in .NET, frontend development with Angular, and designing microservices-based solutions deployed in AWS. The project emphasizes scalability, traceability, and continuous product improvement. 🗂️ Requirements: Minimum 5 years of commercial experience as a .NET Developer, Strong hands-on experience with .NET in backend development, Practical experience with Angular in frontend development, Experience with microservices-based architecture, Experience with AWS cloud services 📃 Skills: .NET, Angular, AWS, Microservices 🏢 Description: We are looking for a Senior .NET Developer to join a long‑term product development project in the industrial and manufacturing domain. The role focuses on building and maintaining a custom‑built application that supports end‑to‑end production and logistics processes for industrial clients. The project uses modern technologies and follows an innovation‑driven approach, with strong emphasis on process traceability, scalability, and continuous improvement. Your tasks Develop and maintain backend solutions using .NET for a custom industrial application Implement new product functionalities according to business and process requirements Build and extend frontend features using Angular Design and develop solutions based on a microservices architecture Develop, deploy, and maintain solutions in an AWS cloud environment Requirements Minimum 5 years of commercial experience as a .NET Developer Strong hands‑on experience with .NET in backend development Practical experience with Angular in frontend development Experience working with microservices‑based architectures Experience working with AWS cloud services Fluency in English Residing in Poland required

🏢 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: 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: Hands-on Senior .NET / Azure Engineer role focused on designing and delivering scalable, secure integration solutions across enterprise platforms. The position combines architecture design with end-to-end implementation of API-driven and microservices-based systems in a global financial environment. You will own solutions from concept through production, leveraging .NET and Azure technologies. 🗂️ Requirements: Strong experience with .NET (C#) in enterprise environments, Extensive hands-on experience with Microsoft Azure, Experience with Azure Functions, Experience with Service Bus, Experience with API Management (APIM), Experience with Application Insights, Proven experience building API-driven architectures, Proven experience building microservices architectures, Strong understanding of integration patterns, Strong understanding of distributed systems, Experience with unit testing, Ability to deliver solutions from design to production autonomously 📃 Skills: .NET, C#, Azure, AzureFunctions, ServiceBus, APIM, ApplicationInsights, APIs, Microservices, DistributedSystems, UnitTesting, Python, GCP 🏢 Description: Senior .NET / Azure Engineer (Solutions-Focused) Kraków, Poland (6 days per month onsite – flexible scheduling) Up to 1700 PLN/day (B2B) Overview We’re supporting a global financial services organisation in hiring a Senior .NET / Azure Engineer to play a key role in designing and delivering scalable integration solutions across enterprise platforms. This is a hands-on, solutions-focused position where you will operate at the intersection of architecture and engineering — owning designs and driving them through to production. The core focus is firmly on .NET and Azure , with Python considered a nice to have . The Role You’ll take ownership of designing and delivering robust integration solutions across complex systems, working closely with senior stakeholders and architecture leadership. This is not a pure architecture role — you’ll be expected to design, build, and deliver end-to-end solutions. Key Responsibilities Design end-to-end solution architectures for APIs and microservices Build and deliver scalable, secure integration solutions using .NET and Azure Develop low-latency communication between backend systems and UI layers Lead integration work across platforms using Azure Functions, Service Bus, and APIs Collaborate with senior architecture stakeholders on design approvals and improvements Monitor, debug, and optimise applications using Application Insights Contribute to future-state architecture discussions, including multi-cloud considerations Technical Requirements Strong experience with .NET (C#) in enterprise environments Extensive hands-on experience with Microsoft Azure , including: Azure Functions Service Bus API Management (APIM) Application Insights Proven experience building API-driven and microservices architectures Strong understanding of integration patterns and distributed systems Experience with unit testing and quality-first development practices Ability to move from design to production delivery autonomously Nice to Have Exposure to Python (not a core requirement) Experience with GCP or multi-cloud environments Experience integrating with CRM or SaaS platforms Background working in financial services or regulated environments What We’re Looking For A hands-on engineer with strong design capability Someone who can take ownership — from concept through to delivery A proactive problem solver who can unblock integration challenges Strong communicator, comfortable working with senior technical stakeholders Additional Information Flexible hybrid model: 6 days per month in the Kraków office (not fixed weekly) Long-term programme of work within a global enterprise environment Competitive B2B rate up to 1700 PLN/day

🏢 Summary: Oferta dotyczy roli Senior .NET Developera w sektorze bankowym, odpowiedzialnego za rozwój backendu, utrzymanie mikroserwisów oraz integracje systemowe. Praca obejmuje rozwój aplikacji w .NET Core, optymalizację baz danych oraz udział w procesach Agile. Model pracy zakłada obecność w biurze w Warszawie raz w tygodniu. 🗂️ Requirements: Minimum 6 lat doświadczenia w .NET Core/C#, Doświadczenie z SQL Server, Umiejętność tworzenia i optymalizacji zapytań SQL, Doświadczenie z systemami kolejkowymi, Znajomość mikroserwisów, Doświadczenie z integracjami backendowymi 📃 Skills: .NET, C#, SQL, SQLServer, CosmosDB, Azure, AzureServiceBus, EventHub, Kafka, MQ, ElasticSearch, MongoDB, Swagger, OpenAPI 🏢 Description: Informacje o projekcie: Branża: bankowość Stawka: do 180 zł/h netto + VAT, B2B Lokalizacja: Warszawa - raz w tygodniu praca z biura Język projektu: polski, angielski Rola Senior .NET Developera koncentruje się na projektowaniu i implementacji funkcji backendowych, utrzymaniu mikroserwisów oraz optymalizacji procesów bazodanowych. Obowiązki: Projektowanie i implementacja nowych funkcjonalności backendowych platformy w technologii .NET Core. Rozwój i utrzymanie mikroserwisów oraz integracja z zewnętrznymi partnerami. Implementacja i rozwój wyszukiwarek treści. Tworzenie i optymalizacja zapytań do baz danych (SQL Server, Cosmos DB). Udział w analizie wymagań, refinementach backlogu i planowaniu sprintów. Dbanie o jakość kodu poprzez testy jednostkowe, code review i zgodność z dobrymi praktykami. Wymagania: Minimym 6-letnie doświadczenie w programowaniu w .Net Core/C# Tworzenie i optymalizacja zapytań do baz danych (SQL Server). Praca z systemami kolejkowymi (preferowane Azure Service Bus, Event Hub, ale może być też Kafka lub MQ). Mile widziane: Doświadczenie w pracy z search engines, preferowany Azure AI Search, ale też inne, np. ElasticSearch. Zna Azure Cosmos DB lub inne bazy NoSQL (np. MongoDB) i wie, kiedy je stosować. Doświadczenie w tworzeniu aplikacji uruchamianych w chmurze Azure (AppServices, Functions, Storage, Application Insights/Log analytics). Tworzenie dokumentacji API (Swagger/OpenAPI). Doświadczenie w tworzeniu backendu dla aplikacji mobilnych.

🏢 Summary: Oferta dotyczy roli Senior .NET Developera w sektorze bankowym, odpowiedzialnej za rozwój backendu, utrzymanie mikroserwisów oraz optymalizację baz danych w środowisku Azure. Praca obejmuje integracje z zewnętrznymi systemami, rozwój wyszukiwarek treści oraz udział w procesach agile. Model współpracy B2B z pracą hybrydową w Warszawie. 🗂️ Requirements: Minimum 5 lat doświadczenia w .NET Core/C#, Doświadczenie w projektowaniu i implementacji backendu, Znajomość SQL Server i optymalizacji zapytań, Doświadczenie z systemami kolejkowymi, Umiejętność pracy z mikroserwisami, Znajomość procesów Agile i pracy sprintowej, Doświadczenie z testami jednostkowymi i code review 📃 Skills: .NET, C#, SQL, SQLServer, CosmosDB, Azure, AzureServiceBus, EventHub, Kafka, MQ, ElasticSearch, MongoDB, Swagger, OpenAPI, Microservices 🏢 Description: Informacje o projekcie: Branża: bankowość Stawka: do 180 zł/h netto + VAT, B2B Lokalizacja: Warszawa - raz w tygodniu praca z biura Język projektu: polski, angielski Rola Senior .NET Developera koncentruje się na projektowaniu i implementacji funkcji backendowych, utrzymaniu mikroserwisów oraz optymalizacji procesów bazodanowych. Obowiązki: Projektowanie i implementacja nowych funkcjonalności backendowych platformy w technologii .NET Core. Rozwój i utrzymanie mikroserwisów oraz integracja z zewnętrznymi partnerami. Implementacja i rozwój wyszukiwarek treści. Tworzenie i optymalizacja zapytań do baz danych (SQL Server, Cosmos DB). Udział w analizie wymagań, refinementach backlogu i planowaniu sprintów. Dbanie o jakość kodu poprzez testy jednostkowe, code review i zgodność z dobrymi praktykami. Wymagania: Minimym 5-letnie doświadczenie w programowaniu w .Net Core/C# Tworzenie i optymalizacja zapytań do baz danych (SQL Server). Praca z systemami kolejkowymi (preferowane Azure Service Bus, Event Hub, ale może być też Kafka lub MQ). Mile widziane: Doświadczenie w pracy z search engines, preferowany Azure AI Search, ale też inne, np. ElasticSearch. Zna Azure Cosmos DB lub inne bazy NoSQL (np. MongoDB) i wie, kiedy je stosować. Doświadczenie w tworzeniu aplikacji uruchamianych w chmurze Azure (AppServices, Functions, Storage, Application Insights/Log analytics). Tworzenie dokumentacji API (Swagger/OpenAPI). Doświadczenie w tworzeniu backendu dla aplikacji mobilnych.

🏢 Summary: Long-term B2B contract for a Senior .NET Developer to build scalable full-stack cloud applications using .NET, React, and Azure in an international Agile environment. The role involves developing and maintaining modern web solutions, APIs, and cloud services with CI/CD and automated testing practices. Fully remote position focused on Azure-based architectures and high-quality engineering standards. 🗂️ Requirements: 4+ years commercial experience with .NET (C#, .NET/.NET Core, Entity Framework or other ORM, WCF), 3+ years experience with React, 2+ years experience with Azure services (Azure Functions, Logic Apps, Web Apps, Azure SQL/SQL Server), Experience with REST and SOAP web services, Knowledge of software architecture and design patterns, Understanding of Clean Code principles, Experience with Unit Testing, Good knowledge of SQL, Experience with Git and CI/CD pipelines, Fluent English 📃 Skills: C#, .NET, .NETCore, EntityFramework, WCF, React, Azure, AzureFunctions, LogicApps, WebApps, AzureSQL, SQLServer, REST, SOAP, SQL, Git, CI/CD, UnitTesting 🏢 Description: Senior .NET Developer (React & Azure) Location: Remote Contract Type: B2B Rate: 145-155 zł/h Project: Long-term international cooperation About the Role We are looking for an experienced Senior .NET Developer with strong React and Azure expertise to join an international team working on modern cloud-based applications. In this role, you will contribute to the development of scalable full-stack solutions, combining backend development in .NET with modern frontend technologies and Azure cloud services. You will work in an Agile environment, collaborating with global teams and using modern software engineering practices such as CI/CD, automated testing, and cloud-native architectures. Key Responsibilities Develop full-stack applications using .NET technologies and React Apply object-oriented and functional programming approaches to real-world software challenges Build and maintain solutions deployed in the Azure cloud environment Implement and maintain web services and APIs (REST/SOAP) Ensure high-quality, clean, and maintainable code following established design patterns and best practices Contribute to unit testing, code reviews, and testing strategies Work in an Agile delivery model with Continuous Integration and Continuous Delivery (CI/CD) pipelines Collaborate with international teams to deliver scalable and reliable solutions Required Skills & Experience 4+ years of commercial experience with .NET technologies (C#, .NET / .NET Core, Entity Framework or other ORM, WCF) 3+ years of experience with React (Angular experience with recent React exposure is also acceptable) 2+ years of experience with Azure services, such as: Azure Functions Logic Apps Web Apps Azure SQL / SQL Server Experience designing and working with web services and APIs (REST/SOAP) Solid understanding of software architecture and design patterns Knowledge of Clean Code principles and Unit Testing Good knowledge of SQL Experience with Git, CI/CD pipelines, and automated deployment Fluent English (spoken and written) Nice to Have Microsoft Azure certifications Experience working in large international development teams Experience with modern cloud-native architectures What We Offer Private medical care (Medicover) Sports card (Multisport or equivalent) Life insurance Flexible benefits platform Training and certification opportunities International project environment Work with modern Azure cloud technologies Long-term, stable cooperation If you are passionate about building modern cloud applications with .NET, React, and Azure, and enjoy working in international Agile teams, we would love to hear from you.

🏢 Summary: Senior .NET Backend developer role for a business-critical project focused on building, maintaining and optimizing backend solutions and system integrations. The consultant will design and implement REST services, ensure secure authentication/authorization, and maintain high code quality across development and operations. The position involves performance optimization, monitoring improvements, and close collaboration with architects and development teams. 🗂️ Requirements: Strong experience with .NET and C#, Experience developing REST APIs and integrations, Experience with OAuth2, OpenID Connect or JWT, Experience with authentication and authorization mechanisms, Experience handling JSON, XML and CSV formats, Focus on Clean Code and maintainable solutions, Experience with test automation and quality assurance, Experience with logging, monitoring and production troubleshooting, Experience with performance analysis and optimization 📃 Skills: .NET, C#, REST, OAuth2, OpenID, JWT, JSON, XML, CSV, CI/CD, Azure, Logging, Monitoring, Testing, Performance 🏢 Description: Senior .NET Backend Udvikler Opgaven På vegne af en af vores kunder søger vi en erfaren Senior .NET Backend Udvikler til et forretningskritisk udviklingsforløb. Konsulenten bliver en del af et udviklingsteam med ansvar for udvikling, vedligeholdelse og optimering af backend-løsninger samt integrationer til interne og eksterne systemer. Der søges en profil, der kan arbejde selvstændigt, bidrage til arkitektur- og designbeslutninger samt sikre høj kvalitet i leverancerne gennem hele udviklings- og driftsprocessen. Ansvarsområder Udvikling af backend-løsninger i .NET/C# Design og implementering af REST-baserede services og integrationer Arbejde med autentifikation, autorisation og token-baserede sikkerhedsløsninger Håndtering af forskellige filformater og dataudveksling mellem systemer Fokus på kodekvalitet, maintainability og best practices Implementering og forbedring af logging, monitorering og alarmering Test, fejlsøgning og performanceoptimering Bidrage til stabil drift og løbende forbedringer af eksisterende løsninger Samarbejde tæt med forretning, arkitekter og øvrige udviklingsteams Krav til kompetencer Skal-have Solid erfaring med .NET og C# Erfaring med udvikling af REST API’er og integrationer Erfaring med OAuth2, OpenID Connect, JWT eller tilsvarende teknologier Erfaring med autentifikation og autorisation Erfaring med håndtering af filformater som JSON, XML og CSV Fokus på kodekvalitet, Clean Code og maintainable løsninger Erfaring med testautomatisering og kvalitetssikring Erfaring med logging, monitorering og fejlsøgning i produktionsmiljøer Erfaring med performanceanalyse og optimering Flydende dansk i skrift og tale Fordelagtigt Erfaring med Azure-platformen Erfaring med CI/CD pipelines Erfaring fra finans-, pensions- eller forsikringsområdet Erfaring med observability-værktøjer og Application Monitoring Personlige kvalifikationer Selvstændig og proaktiv Struktureret og kvalitetsbevidst Stærke samarbejdsevner God til at kommunikere med både tekniske og forretningsmæssige interessenter Tager ansvar for opgaver fra analyse til implementering og drift Praktisk information Opstart: Hurtigst muligt Varighed: 3 måneder med mulighed for forlængelse Lokation: København Tilstedeværelse: Onsite minimum 5 dage om ugen