About the Atos Group

The Atos Group is a global leader in digital transformation. With approximately 56,000 employees and annual revenue of approximately EUR 7.2 billion (based on the future business structure), the company operates in 54 countries under two brands: Atos for services and Eviden for products and systems. As the European number one in cybersecurity and a leader in cloud computing, the Atos Group works towards a secure and decarbonized future, offering tailored, AI-powered, end-to-end solutions for all industries. The Atos Group is listed on Euronext Paris.

Our team:

Join the Defense Team Germany : We are a highly specialized, cross-functional team developing technological solutions for  Germany's internal and external security . With us, you'll take on real responsibility – shaping architectural decisions, driving scaling initiatives, and designing impactful solutions for critical users with the highest demands for security, availability, and scalability.

These are your tasks :

As a Principal C# Developer (m/f/d) in the Operations Defense & Intelligence (OPS DI) area, you will assume overall technical responsibility for the conception, development and quality of complex applications and software solutions that go far beyond the functionality of standard software.

They significantly shape the technological solution design and contribute strategically to both bidding processes and architectural decisions. In client projects, they assume technical leadership of development teams, manage entire development flows, and are responsible for compliance with technical standards, costs, and quality deliverables.

Your in-depth technological expertise and ability to combine business and technical requirements will make a significant contribution to the successful implementation of demanding IT projects and the further development of the Atos portfolio. Your responsibilities will also include:

Overall technical responsibility & architecture

• Responsibility for solution design in the proposal process, including requirements assessment and selection of suitable technologies and software packages.
• Analysis, design and creation of complex system architectures and software solution architectures
• Responsible development of technical concepts for applications, modules and overall systems

Implementation & Engineering

• Development of sophisticated application components with a focus on C#, .NET Core, modern UI frameworks and web technologies.
• Responsibility for cross-module and cross-application implementation strategies
• Ensuring compliance with architectural specifications, design patterns, development standards, and security and compliance requirements.

Testing, Quality Assurance & Delivery

• Responsibility for the planning, design and implementation of technical test cases and the necessary test environments
• Creation of quality and acceptance concepts for the entire solution
• Control of the technical acceptance processes and ensuring on-time delivery in high quality

Effort estimation, project management & delivery models

• Creation of effort estimates and calculation bases at module, system and overall solution level
• Presentation and defense of effort and technology assessments to project managers and clients
• Selection and control of suitable delivery models (nearshore, offshore, hybrid)
• Independent (partial) project management and technical control of teams

About the Atos Group

The Atos Group is a global leader in digital transformation. With approximately 56,000 employees and annual revenue of approximately EUR 7.2 billion (based on the future business structure), the company operates in 54 countries under two brands: Atos for services and Eviden for products and systems. As the European number one in cybersecurity and a leader in cloud computing, the Atos Group works towards a secure and decarbonized future, offering tailored, AI-powered, end-to-end solutions for all industries. The Atos Group is listed on Euronext Paris.

Our team:

Join the Defense Team Germany : We are a highly specialized, cross-functional team developing technological solutions for  Germany's internal and external security . With us, you'll take on real responsibility – shaping architectural decisions, driving scaling initiatives, and designing impactful solutions for critical users with the highest demands for security, availability, and scalability.

These are your tasks :

As a Principal C# Developer (m/f/d) in the Operations Defense & Intelligence (OPS DI) area, you will assume overall technical responsibility for the conception, development and quality of complex applications and software solutions that go far beyond the functionality of standard software.

They significantly shape the technological solution design and contribute strategically to both bidding processes and architectural decisions. In client projects, they assume technical leadership of development teams, manage entire development flows, and are responsible for compliance with technical standards, costs, and quality deliverables.

Your in-depth technological expertise and ability to combine business and technical requirements will make a significant contribution to the successful implementation of demanding IT projects and the further development of the Atos portfolio. Your responsibilities will also include:

Overall technical responsibility & architecture

• Responsibility for solution design in the proposal process, including requirements assessment and selection of suitable technologies and software packages.
• Analysis, design and creation of complex system architectures and software solution architectures
• Responsible development of technical concepts for applications, modules and overall systems

Implementation & Engineering

• Development of sophisticated application components with a focus on C#, .NET Core, modern UI frameworks and web technologies.
• Responsibility for cross-module and cross-application implementation strategies
• Ensuring compliance with architectural specifications, design patterns, development standards, and security and compliance requirements.

Testing, Quality Assurance & Delivery

• Responsibility for the planning, design and implementation of technical test cases and the necessary test environments
• Creation of quality and acceptance concepts for the entire solution
• Control of the technical acceptance processes and ensuring on-time delivery in high quality

Effort estimation, project management & delivery models

• Creation of effort estimates and calculation bases at module, system and overall solution level
• Presentation and defense of effort and technology assessments to project managers and clients
• Selection and control of suitable delivery models (nearshore, offshore, hybrid)
• Independent (partial) project management and technical control of teams