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C++ Developer for Infrastructure and Network Development Team (hybrid)

IONOS ENCalea Floreasca 246c, 014476 BucharestPosted 27 Sept 2026

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About this role

About IONOS At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises.

We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit. Ready for your next step? Become part of IONOS and grow with us. About the team: The Infrastructure and Network Software Development is responsible for the development of internal tooling used for 1&1 Internet both backend platform and frontend management UIs. We are an experienced team developing applications and tools that are used in a very complex ecosystem.

Active projects are focusing on developing Orchestrators for Datacenter and Network infrastructure. We are staying in contact with DevOps technologies like Kubernetes/OpenShift, Docker containers, Jenkins and others. We are working in a very friendly environment and we support each team member to evolve and learn new technologies. We have a proficiency in Open Source technologies and encourage every member to become a contributor to different Open Source projects.

You will be working on a huge project, Enhanced Backup, that does backup to millions of web hosts every day, up to 2 Peta/day. It is composed of many modules and works closely to the Linux operating system and its complex file system. The whole project has about 750,000 lines of code. Main responsibilities: Work closely with Product Owners, Architects to define the best technical solutions that match our product vision; Work closely with other engineers to develop new products; Work on extensions of existing products; Very good written and verbal English skills; Take part in all phases of development, maintenance and housekeeping of the Enhanced Backup solution.

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Technical Requirements:: C++: Excellent, Versions of C++ from STD17; Network Programming in C++ - TCP, UDP; Multithreading in C++ - Used by the app; C++ STL - Used by the app; CMAKE 3.3: Very Good, For project management and building; Linux - (Debian OS): Very Good, The base OS used for the machines in EHB; Linux OS File System - Understanding of Linux file system hierarchy and permissions; Linux processes - Process Management: Knowledge of Linux process management, including signals, forking, and IPC; Rest API: Good, For API building; Google Test Framework: Good, For UnitTesting; Python 3.12: Medium, For integration testing and other utilities; Docker & docker-compose: Low, For local development environment; OpenSSL 3.0: Low, For secure communication.

Other apps and technical knowledge that is useful: General backup theory - The app is a backup app; Block based backup theory - Needed for backup/restore operations; C++ Concepts - Used by the app; Lib Boost - Used by the app; Protobuf - Used for serializing structured data; Bash scripting - Needed for deployments, automating stuff. What we offer: Access to local/international trainings, development and growth opportunities, including access to e-learning platforms, covering both technical and soft skills areas; Modern technologies, product responsibility; Flexible work schedule; Hybrid work model; Medical services package from one of two private providers; 25 vacation days per year; Substitute days off for public holidays that occur on the weekend; Meal tickets; Internal referral program; Team events, networking events organized to promote a passionate, creative and diverse culture; <span style="font-size: 12pt; font-family: '

Source listing: greenhouse_ionos2

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