Information about the position Job description, responsibilities and dutiesFREQUENTIS Solutions & Services (FSS) as a member of the Austrian Group FREQUENTIS AG, is focused on software development, system engineering and delivery of safety-critical voice communication and information systems. Our solutions are developed and distributed in the following business segments: Air Traffic Management & Defence (civil and military air traffic control, aeronautical information management), Public Safety (police, fire and rescue services, emergency medical services) and Public Transport & Maritime (railway and urban transport solutions, vessel traffic management).Frequentis portfolio of market-leading products is designed to provide comprehensive solutions for the aviation industry. From automation to tower systems, voice communication to traffic optimisation, information management to surveillance, networks to UTM and recording, we offer a broad range of solutions that cater to all ATM operational needs.Your RoleAs a Software Developer you will help shape the next generation of air–ground communications. Join an international technology leader and work with major aviation partners to turn an innovative proof of concept into reliable, product-quality software for ESA’s ground infrastructure. Solve complex networking challenges, validate new ideas through prototypes, and benefit from flexible working arrangements with a strong focus on work–life balance.Main ResponsibilitiesEvolve the existing proof of concept into reliable, secure, observable, and maintainable product software.Design and implement event-driven network services, protocol handlers, and state-machine logic.Translate RFCs and aviation or networking specifications into traceable implementations and automated unit tests.Integrate software with network devices and services using IPv4/IPv6, UDP/TCP, NETCONF, SNMP, SSH, and gRPC.Contribute to architecture, code reviews, unit and integration testing, CI/CD, packaging, and technical documentation.Diagnose complex issues in Linux and containerized environments.Collaborate with testers, system engineers, and international aviation partners.Technical Skills & CompetenciesAt least three years of relevant professional software-development experience, or equivalent demonstrated expertise.Strong proficiency in Python or a comparable high-level language, with the ability to become productive in Python quickly.Experience developing event-driven, asynchronous, or concurrent software.Solid hands-on networking knowledge, including IPv4/IPv6, TCP, UDP, routing, and diagnosing protocol or traffic issues using tools such as Wireshark and tcpdump.Ability to understand complex technical standards and turn them into clear, maintainable, and tested code.Practical Linux experience, including package installation, virtual machines, networking, and troubleshooting.Experience with Git-based workflows, automated unit testing, and collaborative code reviews.Good technical English and the ability to work effectively in an international team.Special Skills & AbilitiesScripting and automation in Linux environments.Experience with OCI containers, Docker or Podman, Compose, Jenkins, and CI/CD pipelines.Knowledge of NETCONF, SNMP, gRPC, SSH, LISP, raw sockets, or binary protocol implementation.Experience productizing prototypes or developing high-availability, networking, aviation, or other mission-critical systems.Familiarity with specification-driven and responsible AI-assisted development.Experience working in a Scrum team and using Jira or a comparable work-management tool.Experience with development in aviation, telecommunications or other mission-critical systems. Employee perks, benefitsTraining and development program (business and product trainings, language course)Employee Referral Program (financial reward for recommending a successful candidate)Employee Assistance Program (legal, financial and psychological counselling)Meal contribution fully paid by the companyMultisport card/Pension scheme contribution (DDS)Flexible working hours, home officeRefreshments, company & team events

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Software Developer - Future Air-Ground Communications