Senior .Net Developer

🏢 Summary: Senior .NET Developer role focused on transforming a data-intensive analytical platform for the cloud. The position involves scalable architecture design, legacy modernization, SOA-based development, user support, and close collaboration with engineering, analysis, and QA teams. 🗂️ Requirements: 5+ years of .NET software development experience, Web services design and implementation expertise, AWS and cloud environment experience, Redux and Context API mastery in React applications, Software design principles and best practices, Advanced English 📃 Skills: .NET, AWS, React, Redux, Context, SOA, Webservices 🏢 Description: We are looking for a Senior .NET Developer to join our team and contribute to the cloud transformation of a data-intensive analytical platform. In this role, you will collaborate with innovative and diverse professionals from around the world, designing scalable architectures and modernizing legacy components to ensure performance and reliability. Your tasks Contributing to the cloud transformation of a data-intensive analytical platform by designing scalable architectures and modernizing legacy components Ensuring continuous technological evolution of the product by proposing and implementing modern frameworks and architectural improvements Applying Service Oriented Architecture (SOA) concepts in software design and development Providing timely and courteous support to platform users, ensuring issues are understood, analyzed, and resolved promptly Collaborating closely with a team of software engineers, analysts, and quality engineers to design and build software solutions that meet business needs Adhering to team design and coding procedures and standards Requirements Minimum 5 years of experience in software development with a strong focus on .NET technologies Deep expertise in designing and implementing web services Practical experience with AWS and cloud environments Hands-on mastery of Redux and Context API in React applications Strong understanding of software design principles and best practices Advanced level of English Nice-to-have requirements Experience with C#

🏢 Summary: Remote, long-term B2B contract for an experienced .NET Software Developer supporting a European Union organization. The role covers enterprise-system design and development, technical leadership, solution architecture, quality optimization, releases, testing, and 2nd/3rd-line support. Rate: 215 PLN net + VAT per hour. 🗂️ Requirements: Completed at least one full solution lifecycle, Expertise in enterprise-level software development, UML application design, Data, business-logic and UI-layer design and development, Scrum experience, Technical team leadership capability, Technical-solution documentation skills, Problem-solving skills, At least 2 years of experience with mission-critical complex enterprise systems, Experience with asset and/or human-resources management and financial-management systems, At least one internationally recognized intermediate software-development certification relevant to the domain 📃 Skills: .NET, UML, Scrum, Enterprise, Testing, Prototyping, Configuration, Deployment 🏢 Description: Currently, for one of our Partners, we are looking for an experienced Software Developer .NET (m/f/n) to support a long‑term project delivered for an organization of the European Union based in Warsaw. Requirements: Has gone at least 1 time through the complete lifecycle of the solution Expert in developing enterprise level software systems in specified technology domain Knows UML and can design applications in UML Proficient in designing and developing: data layer, business logic layer and UI layer Worked in Scrum developments Is capable for leading technical teams Holds ability to document effectively technical solutions Presents problem solving skills Specific requirements At least 2 years of experience with mission critical complex enterprise systems including asset and/or human resources management, as well as financial management. At least 1 certification among: Intermediate level certificate in software development relevant to the domain or an equivalent certification recognized internationally (subject to acceptance as a valid credential by the Contracting Authority) Typical tasks and responsibilities Designs and develops the system Lead development teams Translates requirements into design Optimizes software from performance, security and quality points of view Produces technical documentation Estimates effort and time for development Sets software development standards Propose technical solutions for business needs and technical problems Collects and interprets software metrics Manages configuration and releases Contributes to requirements analysis, testing, quality assurance, change management, deployment Tests solutions and develops testing tools Documents developments Prototypes solutions Acts as 2nd and 3rd line support Offer: Rate: 215 PLN net +VAT/H Set-up: Remote B2B

🏢 Summary: 6-miesięczny kontrakt z możliwością przedłużenia dla Senior .NET Developera odpowiedzialnego za projektowanie, rozwój i utrzymanie skalowalnych aplikacji backendowych oraz API. Rola obejmuje współpracę z zespołami projektowymi, projektowanie architektury, optymalizację rozwiązań, utrzymanie systemów produkcyjnych i wsparcie mniej doświadczonych osób. 🗂️ Requirements: Minimum 6 lat komercyjnego doświadczenia w C#/.NET, Bardzo dobra znajomość .NET Core / .NET 6+, Doświadczenie w projektowaniu i rozwoju aplikacji backendowych oraz REST API, Znajomość wzorców projektowych i zasad SOLID, Doświadczenie w pracy z bazami danych SQL, Znajomość Git i praktyk CI/CD, Doświadczenie w Agile, Scrum lub Kanban, Bardzo dobra znajomość języka angielskiego 📃 Skills: C#, .NET, SQL, REST, Git, CI/CD, Agile, Scrum, Kanban, SOLID 🏢 Description: Poszukujemy doświadczonego Senior .NET Developera (C#) do realizacji projektu dla naszego klienta. Jest to kontrakt na 6 miesięcy z możliwością przedłużenia współpracy. Zakres obowiązków Projektowanie, rozwój i utrzymanie aplikacji backendowych w technologii C#/.NET. Tworzenie oraz rozwijanie wydajnych i skalowalnych usług oraz API. Współpraca z zespołem projektowym przy analizie wymagań biznesowych i technicznych. Dbanie o wysoką jakość kodu poprzez stosowanie dobrych praktyk programistycznych oraz udział w code review. Identyfikowanie i rozwiązywanie problemów technicznych oraz optymalizacja istniejących rozwiązań. Tworzenie i aktualizacja dokumentacji technicznej. Udział w projektowaniu architektury aplikacji oraz proponowanie usprawnień technologicznych. Współpraca z zespołami QA, DevOps oraz analitykami w celu sprawnej realizacji projektu. Wsparcie mniej doświadczonych członków zespołu oraz dzielenie się wiedzą. Aktywny udział w procesie wdrażania nowych funkcjonalności i utrzymania systemów produkcyjnych. Wymagania: Minimum 6 lat doświadczenia komercyjnego w programowaniu w C#/.NET . Bardzo dobra znajomość platformy .NET (.NET Core / .NET 6+). Doświadczenie w projektowaniu i rozwoju aplikacji backendowych oraz REST API. Znajomość wzorców projektowych i zasad SOLID. Doświadczenie w pracy z bazami danych SQL. Znajomość Git oraz praktyk CI/CD. Umiejętność pracy w metodykach Agile (Scrum/Kanban). Bardzo dobra znajomość języka angielskiego umożliwiająca pracę w międzynarodowym środowisku.

🏢 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: Your responsibilities - Design, develop, and maintain high-performance back-end services using .NET and C# for an established, scalable system used for selecting electronic components and integrating with manufacturer databases. - Work extensively with Azure cloud services and CosmosDB to build, maintain, and monitor resilient solutions. - Set up test automation structures and frameworks from scratch using tools such as Playwright or Selenium. - Actively use AI coding assistants, including GitHub Copilot, ChatGPT, or Cursor, to enhance productivity and troubleshooting; proactively share AI-assisted development practices with the team. - Collaborate directly with the US-based team in an Agile environment, participating in code reviews, sprint planning, and architectural discussions. - Communicate 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 using modern AI tools in daily software development and willingness to promote these practices. - Fluency in English to ensure seamless communication with US managers and developers. - Flexibility to align with US working hours, including daily meetings between 17:00 and 19:00 CET. - Residence in Poland and/or eligibility to work in Poland. Nice to have - Background or interest in Electrical Engineering. - General understanding of testing practices, CI/CD pipelines, and Git version control. - Knowledge of 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: 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)

🏢 Summary: Long-term remote B2B opportunity for a Senior Frontend Developer to build a secure, real-time incident reporting platform for a European Union institution. The role focuses on micro-frontend architecture, modernization of monolithic applications, performance optimization, and collaboration across multidisciplinary teams. 🗂️ Requirements: University degree in Computer Science, Computer Engineering, Telecommunications, Information Technology, Business Administration and Management, or related discipline, 5+ years of professional frontend development experience, Advanced JavaScript and TypeScript knowledge, Experience with Angular, Experience with SPA and micro-frontend architectures, Experience with .NET and C#, Knowledge of HTML5, Web Components, and browser APIs, Knowledge of web application performance, scalability, and security, Familiarity with cloud environments and container platforms 📃 Skills: JavaScript, TypeScript, Angular, NET, C#, HTML5, WebComponents, SPA, Microfrontends, Microservices, OpenShift, Cloud, Containers, UI/UX 🏢 Description: Currently, we are looking for an experienced Senior Frontend Developer (m/f/n) to support a long-term project delivered for a European Union organization. You will join a strategic project linked to security and border-control activities, developing a new generation of systems for real-time incident reporting and information dissemination. The solution will implement requirements set out in a recently adopted European Commission regulation. Tasks • Design and implement solutions based on micro-frontend architecture. • Participate in transforming monolithic applications into microservices- and micro-frontends-based architectures. • Analyse, optimise, and improve application performance, scalability, and maintainability. • Apply Security by Design best practices from the design phase. • Collaborate with business analysts to define and validate functional requirements. • Work closely with backend and frontend teams to ensure integrated, consistent solutions. • Produce high-quality technical documentation. • Carry out code reviews and contribute to the continuous improvement of development standards. • Support the analysis and design of user interfaces (UI/UX). Requirements • University degree in Computer Science, Computer Engineering, Telecommunications, Information Technology, Business Administration and Management, or a related discipline. • Minimum 5 years of demonstrable professional experience in frontend development. • Advanced knowledge of JavaScript and TypeScript. • Solid experience with modern frameworks such as Angular. • Practical experience with SPA and micro-frontend architectures. • Experience with .NET and C#. • In-depth knowledge of HTML5, Web Components, and standard browser APIs. • Knowledge of performance optimisation, scalability, and security in web applications. • Familiarity with cloud environments and container platforms. • Experience with OpenShift is an advantage. Offer • B2B contract. • Remote setup. • Rate: 165–175 PLN net + VAT per hour.

🏢 Summary: Remote B2B opportunity for a .NET Software Developer to design, build, and optimize mission-critical enterprise systems for a major European institution. The role includes end-to-end development, technical leadership, solution design, testing, release management, and advanced technical support, with occasional visits to Warsaw. 🗂️ Requirements: 4+ years of IT-relevant professional experience, 2+ years of relevant project or similar-role experience, 2+ years working with mission-critical complex enterprise systems, Experience with asset or human-resources management and financial-management systems, Expertise in enterprise-level .NET software development, Data, business-logic, and UI layer design and development experience, UML application design experience, Completion of at least one full software-solution lifecycle, Scrum development experience, Technical team leadership experience, Fluent English at B2 level or higher, Bachelor’s degree or equivalent 3 years of higher education in an ICT-relevant field, Intermediate .NET software-development certification or an accepted equivalent international certification 📃 Skills: .NET, UML, Scrum, ICT 🏢 Description: Software Developer (.NET) — own system design, lead technical teams, and drive end-to-end development. Far-site remote, 200 PLN net/h B2B. IT · Multiple locations · Fully Remote About the Client and our Role At Optiveum, we connect top IT professionals with exciting tech initiatives. In this case, we are the recruitment partner acting within the TimeDev Framework Agreement to provide outsourcing consultants for our partner organization . By taking part in this long-term project, you will be contributing as a Software Developer to support a major European institution. The Role We are looking for a Software Developer (.NET) to take an active role in designing, building, and optimizing enterprise-level software systems. In this position, you will lead development initiatives, implement robust solutions across data, business logic, and UI layers, and ensure software meets stringent security, performance, and quality standards. You will work closely with other technical teams to prototype solutions and support complex enterprise frameworks. Responsibilities Design and develop the system, translating requirements into technical design. Lead development teams and set software development standards. Design applications using UML and optimize software for performance, security, and quality. Propose technical solutions for business needs and solve complex technical problems. Estimate effort and time for development. Produce technical documentation and effectively document developments. Manage configuration, releases, and collect/interpret software metrics. Contribute to requirements analysis, testing, quality assurance, change management, and deployment. Test solutions, develop testing tools, and prototype new features. Act as 2nd and 3rd line technical support. Expectations Experience: Minimum 4 years of overall IT-relevant professional experience, including at least 2 years of project experience relevant to the profile (or in a similar position). Specific Domain Expertise: At least 2 years of experience with mission-critical complex enterprise systems, specifically including asset and/or human resources management, as well as financial management. Technology Stack: Expert in developing enterprise-level software systems in the .NET technology domain . Technical Skills: Proficient in designing and developing the data layer, business logic layer, and UI layer. Strong knowledge of UML and ability to design applications in UML. Completion of at least 1 full lifecycle of a software solution. Process & Leadership: Experience working in Scrum developments, capable of leading technical teams, and strong problem-solving skills. Language: Fluent English (minimum B2 level / CEFR). Education (Level 6): Minimum Bachelor’s degree (or 3 years of higher education confirmed by a diploma). An ICT-relevant degree is mandatory. Certifications Requirements You must possess at least one of the following: An Intermediate level certificate in software development relevant to the domain (.NET). An equivalent internationally recognized certification (subject to acceptance as a valid credential by the Contracting Authority). What We Offer Salary: max 200 net / hour. Contract Type: B2B agreement. Type of Work: Remote with occassional visits to the client HQ in Warsaw, Poland