Senior C# Developer for Microsoft 365

Veeam Software seeks a Senior C# Developer in Warsaw, Poland, to work on Microsoft 365 solutions. This role involves building and maintaining software that enhances Veeam’s product offerings. Key responsibilities Design and develop software applications in C# that integrate with Microsoft 365. Maintain and improve existing code to support new features and ongoing enhancements. Collaborate with engineering, product, and QA teams to deliver updates and improvements. Contribute to solutions that address customer needs and refine the user experience. Location This position is based in Warsaw, Poland.

Veeam Software seeks a Senior C# Developer based in Warsaw, Poland. This position centers on enhancing data management and cloud backup products. Collaboration and delivering clear results for clients are core values for the team. Key responsibilities Design and implement features for data management and cloud backup solutions using C# Collaborate with other developers to expand and strengthen product functionality Share ideas and participate in code reviews and team discussions Requirements Extensive hands-on experience with C# development Comfort working as part of a collaborative team Genuine interest in data management and cloud technologies

Who are we?NRB - Trasys International is a progressive global enterprise, recognized as a reliable partner for EU Institutions. With a commitment to excellence and a 30-year legacy of providing high-quality solutions, we are devoted to facilitating the growth and success of our clients. Our mission is to assist clients in navigating the complexities of digital transformation by delivering the right talent at precisely the right moment for their needs. We continuously seek dedicated professionals eager to engage in challenging international projects and capable of producing top-tier results in diverse multicultural settings. Our offerings encompass (but are not limited to) modernization of solutions, digital workspaces, cloud technologies, and IT security. Our headquarters are in Brussels, with active accounts and offices throughout Europe including locations such as Luxembourg, Amsterdam, Athens, Stockholm, and Geneva.Is this YOU?We are currently seeking a Microsoft 365 Specialist for our esteemed client based in Warsaw, Poland—an EU Institution. This role involves a long-term mission in the domains of cybersecurity, public sector, and law enforcement. You will be instrumental in managing business architecture, guiding solution designs, and promoting collaboration between business architects and project teams to ensure alignment with the client’s long-term vision.Please note that this is a hybrid role requiring on-site presence at the client’s headquarters in Warsaw, and candidates must reside within a 2-3 hour travel radius from Warsaw by ground transportation.Specific responsibilities include:Administration of O365 Services:Providing second-line supportTroubleshooting incidents and managing the ticketing systemArchitecting long-term changes to O365 ServicesCollaborating with fellow administrators to harmonize solutions and processesContributing to specifications for O365-based solutionsWorking with development teams to ensure alignment of O365 Services with project needsMaintaining system documentation and assisting in the creation of documentation for new solutionsReporting on activities and executing additional specific duties as required.

We are seeking a highly skilled and motivated Senior Full Stack Developer proficient in Python 3 and C++. In this role, you will work closely with our engineering and development teams to design, implement, and maintain robust software solutions that meet our clients' needs.Your expertise will help in driving innovation and developing new features while ensuring the performance, quality, and responsiveness of applications.

Veeam Software seeks an experienced C# Developer to join its Warsaw team. This position is designed for professionals who take pride in building dependable, thoughtfully designed software. Role overview The team emphasizes collaboration and values technical excellence. Developers here work together to achieve high-quality outcomes and maintain a supportive environment. What you will do Contribute to the design and development of software using C# Focus on delivering reliable and maintainable solutions Work closely with colleagues to achieve shared goals Requirements Professional experience with C# development Commitment to quality and attention to detail Interest in collaborative problem-solving

We are seeking a highly skilled Senior Microsoft Platform/System Engineer to join our dynamic team at Altersolutions in Warsaw. In this role, you will leverage your deep expertise in Microsoft technologies to deliver innovative solutions that drive business success. Your contributions will be instrumental in enhancing our clients' systems and infrastructure.As a key member of our engineering team, you will collaborate with cross-functional teams to design, implement, and optimize Microsoft-based solutions. Your experience will help guide best practices and ensure the highest quality of service delivery.

At Veeam, we are committed to being the Data and AI Trust Company, empowering organizations to secure and comprehend their data and AI assets. As the leading provider in data resilience and security posture management, we are uniquely positioned to address the convergence of identity, data security, and AI risk. With our headquarters in Seattle and a presence in over 30 countries, Veeam proudly protects more than 550,000 customers globally, ensuring their businesses operate smoothly. Join us on our journey as we move forward together, fostering growth, learning, and making a significant impact for some of the world’s most prominent brands.About the RoleWe are seeking a motivated Junior C# Developer to become a key part of our team focused on Veeam Backup and Replication, along with its extensions.What You’ll DoDevelop and design REST APIs for Veeam Backup & Replication.Create new products while providing support for existing features.Engage in individual and team development of components and overall product architecture.Technologies We Use:C#, .Net 10, Windows/Linux, MS SQL, PostgreSQL, Multithreading.

Veeam is recognized as the Data and AI Trust Company, dedicated to empowering organizations to fully comprehend, secure, and maintain the resilience of their data and AI systems. As a leader in data resilience and security posture management, Veeam is designed for the convergence of identity, data, security, and AI risk management. With its headquarters in Seattle and operations in over 30 countries, Veeam safeguards the data of more than 550,000 customers globally, who rely on Veeam to ensure their business continuity. Join us in our mission to advance fearlessly, fostering growth, learning, and making a significant impact for some of the world's largest brands.About the RoleWe are seeking a skilled C# Developer to join our team, where you will play a pivotal role in enhancing the backend of Veeam Backup for Hypervisors, improving data protection and fostering business resilience.What You'll DoDesign and implement business logic for virtualization products (RHV, Nutanix, Proxmox VE, etc.)Develop new functionalities and enhance existing featuresImplement significant functionalities across various components of the productContribute to the individual development of components and the overall architecture of the product

Join our innovative team at inetum2 as a JVM Software Engineer / C Developer. In this role, you will leverage your expertise in Java Virtual Machine (JVM) and C programming to design, develop, and maintain high-quality software solutions.We are looking for someone passionate about technology, who thrives in a collaborative environment and is eager to tackle complex challenges. You will work closely with cross-functional teams to deliver robust applications that meet our clients' needs.

At Rydoo, we strive to simplify expense management, allowing individuals to concentrate on what truly matters rather than drowning in receipts. With over a million users relying on us, we facilitate faster and smarter expense submission, approval, and control.In line with this mission, Semine has been developing AI technologies since 2015 to eliminate the tedious and repetitive tasks in accounting, empowering finance teams to work more efficiently.In July 2025, Semine united with Rydoo to revolutionize the future of financial automation. Together, we're crafting a comprehensive, AI-driven platform designed to streamline accounts payable and expense management, enabling businesses to operate with greater simplicity, speed, and intelligence.Our international team exceeds 200 talented individuals who believe that innovative technology should enhance the quality of life. If you have visionary ideas and a desire to create impactful solutions, you will find a welcoming environment here.

Sperasoft seeks a C++ Developer with strong Unreal Engine 4 or 5 skills to join the team building AAA game titles. This remote role is based in Warsaw, Masovian Voivodeship, Poland. Work alongside experienced engineers and contribute to high-profile projects aimed at major gaming platforms. Key responsibilities Design and implement features across gameplay, AI, and engine systems using Unreal Engine 4 or 5. Collaborate with team members from various disciplines throughout the development cycle. Assist with deployment to major platforms and stores such as Sony, Microsoft, and Nintendo. Participate in architectural planning, design new systems and modules, and prototype features. Optimize code for performance to ensure smooth player experiences. Engage in all phases of game development, from early design through to release.

Join Veeam Software as a Software Developer in Test, where you will be at the forefront of ensuring the quality and reliability of our products. You will work in a dynamic environment, utilizing your expertise in Python or C# to develop automated tests and enhance our testing frameworks.

Tieto Tech Consulting seeks a Senior Software Engineer with strong C programming skills to support telecommunications solutions in Warsaw. This position centers on building reliable software that addresses the needs of the telecom sector. Role overview This role involves designing, developing, and maintaining software components for telecommunications projects. Collaboration with team members is a core part of the work, ensuring solutions meet both technical and industry standards. What you will do Develop and refine software in C for telecom applications Contribute to project planning and technical discussions Work closely with colleagues to deliver project milestones Requirements Experience in C programming Background in telecommunications or related fields Ability to work effectively in a collaborative team environment

JetBrains is seeking an AI Lead focused on integrating artificial intelligence into the C++ ecosystem. This role shapes how AI features enhance C++ development tools, directly impacting the way engineers write and maintain code. Key responsibilities Lead initiatives that embed AI capabilities into JetBrains C++ products Collaborate with engineering teams to design and implement AI-driven solutions for software development workflows Help set the direction for AI in C++ tooling at JetBrains Locations This position is open in Amsterdam, Belgrade, Berlin, Limassol, London, Madrid, Munich, Paphos, Prague, remote (Germany), Warsaw, and Yerevan.

CD Projekt Red is hiring a Software Engineer (C++) to focus on online and multiplayer features at their Warsaw studio. This role is part of the engineering department and helps shape the multiplayer experience for players around the world. Role overview This position centers on developing and refining systems that power multiplayer gameplay. Collaboration is key, as the engineer will work alongside other developers and team members to build engaging online features. What you will do Collaborate with engineers and other team members to develop and enhance online and multiplayer systems. Use C++ to improve game performance and system efficiency. Design and implement new features that support immersive multiplayer experiences. The team Work with a group of experienced professionals dedicated to creating memorable gaming experiences. The team values technical expertise, creativity, and a drive to advance multiplayer gaming.

Join aleph as a Senior Client Partner, where you will lead strategic relationships and drive business growth for our Microsoft partnership. You will play a pivotal role in aligning our services with Microsoft’s offerings, ensuring exceptional value for our clients.

Sperasoft seeks a Rendering Developer to strengthen the visual quality of its games. This is a remote role based in Warsaw, Masovian Voivodeship, Poland. The position centers on building advanced graphics engine features for both PC and console titles. Regular collaboration with engineers, artists, game designers, and QA specialists is part of daily work. Key responsibilities Design and develop graphics engine components for PC and console platforms. Implement and optimize rendering systems, addressing both high-level and low-level needs. Write clean, efficient, and maintainable C++ code. Contribute to technical decisions and influence the rendering architecture. Participate in all stages of game development, from prototyping through release. Mentor and support other engineers as needed.

We are seeking an experienced Senior Backend Engineer to become a vital member of our dynamic, cross-functional product teams. This role demands extensive technical expertise, exceptional communication abilities, and a proactive, collaborative approach. The successful candidate will be deeply involved in ongoing client projects and seamlessly integrated into our established workflows.

Join Tietoevry as a Junior Software Engineer specializing in C language, where you'll contribute to innovative telecommunications solutions. Be part of a dynamic team that pushes the boundaries of technology and drives growth.

As a Cloud Developer, your primary responsibility will be to design, enhance, and maintain our Enterprise Scale Foundation service, including the CI/CD pipeline utilized for deploying our services as infrastructure-as-code. Our goal is to achieve 'everything-as-code', necessitating a comprehensive understanding of Cloud IaaS and PaaS, along with the necessary coding skills to integrate these components effectively.You will collaborate with your team to continuously innovate and expand our feature offerings, ensuring compliance with financial sector regulations while contributing to the development of essential frameworks and policies implemented as code.Your role will involve further enhancing our Enterprise Scale Foundation Service, dashboards, and Azure DevOps capabilities.We value exceptional code craftsmanship, so you should be proficient in software development best practices, including design patterns.You will work with Landing Zones and Guardrails, keeping pace with emerging services and functionalities.Ultimately, you will deliver new Cloud functionalities that create significant business value for our clients.It is crucial that your coding practices adhere to our established Best Practices defined within the Cloud Center of Excellence (CCoE).Participate in awareness campaigns, customer workshops, and other initiatives to promote our services.