Senior .Net Developer

🏢 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: 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 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: 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: Hands-on Senior .NET Developer / Technical Lead role focused on building backend APIs for a new customer mobile app and modernizing a large operational platform. The role offers ownership of architecture, integrations, engineering standards, and future backend team development, with compensation of $5,000–$6,000 plus milestone bonuses and relocation support to Warsaw. 🗂️ Requirements: Commercial .NET / C# experience, Production backend systems and API development experience, API design, authentication, authorization, and security knowledge, SQL and database design experience, Third-party and existing business-system integration experience, Legacy application modernization experience, Cloud infrastructure, CI/CD, testing, and production support knowledge, Technical ownership and sound decision-making ability, Strong communication and practical problem-solving skills 📃 Skills: .NET, C#, API, SQL, Authentication, Authorization, Security, CI/CD, Cloud, Testing, Monitoring, Azure, Umbraco, Microservices, IoT, CRM, ERP, CMS 🏢 Description: One of the largest logistics and storage companies in the region is looking for a Senior .NET Developer / Technical Lead to help build the next generation of its technology platform. This is a hands-on role with significant ownership. You’ll work closely with leadership and product teams, make important technical decisions, and help modernize a large operational platform used across the business. Your first project Your immediate priority will be building the backend APIs for a new customer mobile application. Customers will use the app to manage their accounts and rentals, make payments, and access their storage units. You’ll work closely with the mobile team to design the APIs, authentication, permissions, integrations, and backend workflows that make this possible. Beyond the mobile application, you’ll help move the business away from legacy systems and towards a modern, API-driven platform connecting customer applications, operations, payments, access control, reporting, notifications, and other core services. What you’ll do • Design and build production APIs and backend services using .NET / C# • Work closely with the mobile team on API contracts and backend workflows • Take ownership of key backend and architecture decisions • Integrate new services with existing systems and SQL databases • Help modernize and gradually replace legacy applications • Design secure and reliable integrations between business-critical systems • Improve testing, monitoring, documentation, and CI/CD practices • Help establish development standards as the platform grows • Mentor and potentially help build the future backend team What we’re looking for • Strong commercial experience with .NET / C# • Proven experience building production backend systems and APIs • Strong understanding of API design, authentication, authorization, and security • Good SQL and database design experience • Experience integrating third-party or existing business systems • Experience working with or modernizing legacy applications • Understanding of cloud infrastructure, CI/CD, testing, and production support • Ability to take ownership and make sound technical decisions • Strong communication skills and a practical approach to solving problems Nice to have • Azure or another major cloud platform • Payments • Mobile application backends • Access-control, IoT, or hardware-connected systems • CRM, ERP, CMS, or operational platforms • Umbraco • Microservices or event-driven systems • Leading or mentoring other developers Why join? This isn’t a maintenance role. You’ll have the opportunity to influence the architecture of a major new platform, replace legacy technology with modern systems, and see the software you build used directly by customers and operations. You’ll join at an important stage of the project with the opportunity to take real technical ownership and grow into a broader leadership role as the engineering team expands. Offer • $5,000–$6,000, depending on experience • Rewarding bonuses for milestones hit • Work in a new high-tech office in Warsaw • Long-term growth opportunities and career progression • Relocation support to Warsaw, if needed

🏢 Summary: B2B opportunity for a Senior .NET Full Stack Software Engineer to modernize and scale asset-management transaction and regulatory reporting platforms. The role focuses on delivering reliable, scalable, high-quality solutions, automating manual processes, and collaborating in a global agile environment. 🗂️ Requirements: Senior .NET development experience, Microsoft Azure expertise, Core .NET technologies knowledge, Database technology knowledge, Ability to translate business requirements into reliable, scalable, high-performance technical solutions, Ability to work in a hybrid model from Wroclaw, B2B contract availability 📃 Skills: Azure, .NET, Databases, DevOps, Agile 🏢 Description: Senior .NET Full Stack Software Engineer (with Azure and DevOps expertise) 📌 Type of contract: B2B 📍 Work mode: Hybrid format from Wroclaw (2/3 days from office) We’re looking for .NET developer in Wroclaw to: drive the modernization and scalability of the client, transaction, and regulatory reporting platforms, within Asset Management technology implement high quality solutions that address business needs and adhere to industry standards drive automation of manual processes to the next level closely collaborate within an agile team and a global agile organization translate high level business requirement into technical requirements addressing reliability, scalability, and performance needs Competencies: Microsoft Azure, Core .NET Technologies, Database Technology Benefits ✅ Stable long-term cooperation with opportunity for extension Opportunity to work with modern technologies in an international environment Professional growth and continuous development opportunities Participation in challenging and impactful projects 📩 If you’re interested and meet the qualifications, please send your CV at alina.pchelnikova@dcvtechnologies.co.uk

🏢 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: 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

🏢 Summary: Lead .NET Developer role for an international client, owning delivery of Azure-based applications while improving production performance, reliability, and code quality. The position includes technical leadership, mentoring, collaboration with QA, DevOps, architecture, and product stakeholders, and support for modularizing monolithic functionality. 🗂️ Requirements: 10+ years of software development experience, Strong C#, .NET, ASP.NET Core and Web API experience, Strong Entity Framework / EF Core experience, Strong Azure experience: App Services, Azure SQL, Application Insights, Azure DevOps and CI/CD, Production-system performance and reliability improvement experience, Developer leadership, code review and engineering standards experience, Strong communication with technical and non-technical stakeholders 📃 Skills: C#, .NET, ASP.NET, WebAPI, EntityFramework, EFCore, Azure, AppServices, AzureSQL, ApplicationInsights, AzureDevOps, CI/CD 🏢 Description: Zaven is a software company from Wrocław, Poland. We build high-quality custom software for essential industries. Our focus is on practical results and trusting our people, not on strict rules or long processes. If you want to work with smart teams to build important software, and you want to avoid big company bureaucracy, this is the place for you. Now we’re looking for a .NET Developer to join our team on a project for one of our international clients. We need a hands-on .NET lead developer who can own delivery, improve code quality, mentor developers, and work closely with architecture, QA, DB, DevOps, and product stakeholders. What exactly will you be doing?: Leading development work across .NET, C#, and Azure-based applications. Reviewing and improving code quality, performance, maintainability, and reliability. Working on application performance optimizations, including async/await, EF Core usage, caching, API design, memory allocation, HttpClient usage, long-running processes, and error handling. Supporting the decomposition of monolithic functionality into modular components or services. Partnering with QA teams on testability, regression coverage, defect triage, and release readiness. Mentoring mid-level developers and raising engineering standards. Collaborating with product and business stakeholders to clarify requirements and reduce rework. Participating in production issue analysis and root-cause reviews. Required Skills & Experience: 10+ years software development experience. Strong C#, .NET, ASP.NET Core, Web API experience. Strong Entity Framework / EF Core experience. Strong Azure experience: App Services, Azure SQL, Application Insights, Azure DevOps, CI/CD. Experience improving performance and reliability in production systems. Experience leading developers, reviewing code, and setting engineering standards. Strong communication skills with both technical and non-technical stakeholders. Nice to have: Angular / React / front-end experience. Redis / distributed caching. Azure Front Door, API Management, Service Bus, Storage. Insurance, fintech, or regulated environment experience. Experience with test automation and CI/CD quality gates.