Design and develop security-critical communication server software based on microservice / containerized architectures
Analyze and translate ETSI, 3GPP, and customer-specific requirements into robust software components
Contribute to system architecture decisions with a focus on scalability, resilience, and security
Collaborate with component owners and cross-functional teams during the design phase
Solve complex technical and implementation challenges in close collaboration with the development team
Work hands-on with object-oriented programming languages (e.g. Go, C++, Java) and modern development tools
Develop and maintain CI/CD pipelines and integrate DevOps practices
Ensure software quality through testing, code reviews, and use of testing frameworks/tools
Contribute to secure and high-availability system design (security protocols, encryption, network resilience)
Work with containerization and orchestration platforms such as Kubernetes, OpenShift, Docker
Support integration with network infrastructure and protocols (e.g. SIP, TCP/IP, HTTP, RTP)
Collaborate with international and cross-functional teams across all project phases
Contribute to continuous improvement of development practices and system performance
Support knowledge sharing and team problem-solving.

Background in Computer Science, Telecommunications, or a related technical field
Around 5+ years of experience in software development, ideally in high-availability or telecom environments
Experience with at least one programming language such as Go, C++, or Java
Familiarity with CI/CD pipelines and DevOps practices
Basic understanding of microservices and container technologies (e.g. Docker, Kubernetes)
Knowledge of network protocols (e.g. TCP/IP, HTTP, SIP)
Experience working in Linux environments
Interest or exposure to telecommunications systems (ETSI, 3GPP, MCx is a plus)
Fluent in Croatian and English language skills
Strong problem-solving mindset and analytical thinking
Team-oriented approach with good communication skills
Proactive, hands-on attitude and willingness to learn new technologies.

Competitive and market aligned compensations and benefits
Additional and complementary health insurance
Christmas bonus and gift for children
Vacation allowance
Transportation allowance
Accolade bonus
Referral bonus
Jubilee award
Flexible working hours at Atos or home office
Multisport card
Free parking on site
Unlimited SIM card and business phone
Days of annual leave above the legal minimum
More favorable loans in some banks
Professional and personal development through continuous education and certification
Wellbeing days & After work gatherings

Software Engineer – Critical Communication Systems

Key skills