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

IONOS · Calea Floreasca 246c

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.

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;
Summerfest and Winterfest parties;
Of course, coffee, soft drinks and fresh fruits are on us in the office.

About the company:

As part of United Internet Group, with more than 10,500 employees and 27 million fee-based customer contracts, we are Europe’s leading internet specialist and largest hoster. Building the roof for strong brands such as 1&1, IONOS, STRATO, GMX, WEB DE, MAIL COM, 1&1 Versatel and the Drillisch Online brands, United Internet offers a broad portfolio of Internet access products and cloud applications.

Present in Romania since 2003, we are an Engineering Centre that lives and breathes technology.

Our engineering culture is shaped by the use of cloud native technologies, microservices combined with a DevOps attitude and an innovative mindset. We have a customer centric culture where every colleague is a contributor to our products’ design and success working closely with teams in Bucharest and abroad. Our strength lies in our team spirit and a positive and respectful interaction. In Romania, we have passionate teams sustaining the business segments of Access/Telecommunication, Mail & Media and Hosting, working and enjoying the 1&1 culture together.

Diversity enriches:

Different cultures, nationalities, genders, age groups, sexual orientations, and religions as well as people with disabilities - we encourage diversity. Because only teams that reflect all facets of society offer the best framework conditions for creativity and make a company productive and distinctive. We value diversity and welcome all applications.

Location: Romania, Bucharest

Application Note

We value diversity and welcome all applications – regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.

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