Senior C++ Developer

We are looking for a Senior C++ Developer to join our new team in Osijek.

Key Responsibilities

• Develop and maintain mission-critical, telco-grade applications.
• Implement and enhance low-level communication protocols including SIP, RTP, SRTP, and RTCP.
• Build high-performance server- and client-side modules with strong security and reliability requirements.
• Contribute to distributed system architecture improvements.
• Own the full development lifecycle: design, coding, testing, and documentation.
• Support CI/CD pipelines and DevOps practices.
• Collaborate with international teams, primarily Croatia-based, within an agile environment.
• Maintain accurate technical documentation and design materials.

Design

• Analyze requirements and user stories and define acceptance criteria.
• Design components for distributed, high-availability systems.
• Assess feasibility, risks, and technical dependencies.

Development and Execution

• Develop software components in C++ or a similar object-oriented language.
• Implement communication stacks including SIP, RTP, RTCP, and SRTP.
• Build and optimize Linux-based distributed applications using containers and virtualization.
• Integrate message brokers such as Kafka and RabbitMQ.
• Debug using system-level tools including gdb and profilers.
• Apply secure coding practices and support CI/CD pipelines.

Quality Assurance and Reporting

• Ensure code quality through testing and reviews.
• Troubleshoot system issues and support root-cause analysis.
• Work with QA on test campaigns when required.
• Maintain essential technical documentation.
• Monitor quality metrics and propose improvements.

Team and Process Participation

• Participate actively in Scrum ceremonies.
• Collaborate with cross-functional international teams.
• Contribute to continuous improvement of engineering and DevOps practices.
• Share knowledge and support onboarding of new team members.
• Deliver work reliably and on time.

Requirements

• Degree in Computer Science, Software Engineering, Electrical Engineering, or a similar field.
• 5–10+ years of professional software development experience.
• Strong expertise in C++ and system-level programming.
• Solid knowledge of Linux development and debugging.
• Experience with Docker, Kubernetes, VMware, Proxmox, KVM, Kafka, RabbitMQ, CI/CD, Git, DevOps workflows, distributed systems, and network communication.
• Experience with SIP, RTP, SRTP, RTCP, and RTSP protocols.
• Familiarity with secure protocols and cybersecurity concepts is a plus.
• Excellent English communication skills; French or German is a plus.
• Strong teamwork, problem-solving, and analytical thinking.
• Ability to work independently on complex technical tasks with a proactive and adaptable mindset.

Benefits

• Competitive and market-aligned compensation and benefits.
• Additional and complementary health insurance.
• Christmas bonus and gift for children.
• Vacation, transportation, referral, and jubilee allowances or bonuses.
• Flexible working hours at Atos or home office.
• Multisport card and free on-site parking.
• Unlimited SIM card and business phone.
• Additional annual leave above the legal minimum.
• More favorable loans in some banks.
• Professional and personal development through continuous education and certification.
• Wellbeing days and after-work gatherings.

Visa sponsorship is not available. Only EU citizens will be considered, and relocation to Croatia is mandatory.