{"id":2922916,"url":"https://alion.io/job/ionos-staff-software-engineer-fmd-virtual-network-functions","title":"Staff Software Engineer (f/m/d) Virtual Network Functions","company":{"id":51740,"name":"IONOS","domain":"ionos.com","url":"https://alion.io/company/ionos","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":77,"open_postings":11,"ghost_share":0,"stale_share":0.909,"repost_share":0,"time_to_fill_p50_days":29,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Backend","role_family":"Backend","seniority":"staff","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Berlin, Germany","Karlsruhe, Germany"],"countries":["DE"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":99000,"max_usd":183000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":14},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"eBPF","optional":false},{"name":"Go","optional":false},{"name":"Kubernetes","optional":false},{"name":"KVM","optional":false},{"name":"Linux","optional":false},{"name":"QEMU","optional":false},{"name":"TCP/IP","optional":false}],"status":"live","first_seen_at":"2026-10-20T11:41:42Z","employer_posted_date":"2026-10-20","last_verified_at":"2026-10-24T16:26:29Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"About IONOS\nAt 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.\nWhat 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.\nReady for your next step? Become part of IONOS and grow with us.\nThe IONOS Cloud VNF Development team is seeking a highly motivated and experienced software engineer.\nThe VNF Development team designs, develops and maintains the Virtual Network Functions (VNF) behind IONOS Cloud's network offerings. These products serve both our external customers and other internal IONOS teams. We build our VNFs in Golang and run them on Kubernetes, so the team works across the whole lifecycle: architecture, implementation, deployment and day-to-day operations. As part of the team, you'll play a crucial role in shaping and running these products.\nWe are looking for someone to join our team and work with us on providing the best VNF products possible.\nTasks\nDeveloping and supporting our multiple modern, scalable and high-performance Virtual Network Functions (VNF) offerings of IONOS Cloud using a range of diverse technologies.\nDesigning new features and adopting new technologies (both hardware and \"software defined\") on different components of the VNF infrastructure.\nWriting, testing and reviewing Golang services for our VNFs, using AI-assisted tooling as part of your daily development workflow.\nDeploying, operating and troubleshooting VNF workloads on Kubernetes, including cluster operations, upgrades, monitoring and debugging network issues in production.\nCooperating with other teams to ensure the smooth integration of new Virtual Network Functions with different IONOS products.\nQualification\nProficiency in Golang and/or C/C++, including AI-assisted development.\nHands-on experience with Kubernetes architecture and operations; knowledge aligned with CKA (Certified Kubernetes Administrator) principles.\nKnowledge of the TCP/IP protocol family and networking technologies such as Open vSwitch, OpenFlow, VXLAN, VRF and eBPF.\nExperience with cloud environments and virtualization technologies like QEMU/KVM.\nExperience with the GNU toolchain (gcc, gdb, make, etc.), git and the Linux CLI.\nExperience with Linux system administration and automation.\nNice to have: Linux kernel networking internals, VPP and DPDK.\nBenefits\nHybrid working model.\nFlexible working hours through trust-based working hours.\nAt some locations a subsidized canteen and various free drinks.\nModern office space with very good transport connections.\nVarious employee discounts for activities and products.\nEmployee events such as summer and winter parties, as well as workshops.\nNumerous training and development opportunities.\nVarious health offers, such as sports and health courses.\nApplication Note\nWe 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.","description_format":"text","description_chars":3537,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Hybrid work"],"hiring_locations":[{"name":"Germany","iso":"DE","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Domain Registrars & Registries","Cloud Platforms (IaaS & PaaS)","Web Hosting & VPS"],"lifecycle":[{"event":"open","at":"2026-10-20T12:40:43Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":3,"expected_fill_days":29,"reasons":["conf:1","stale_co","velocity","win:early"],"computed_at":"2026-10-24T06:02:35Z"},"pay":null,"html_url":"https://alion.io/job/ionos-staff-software-engineer-fmd-virtual-network-functions","json_url":"https://alion.io/job/ionos-staff-software-engineer-fmd-virtual-network-functions.json","meta":{"generated_at":"2026-10-24T19:55:24Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":29114,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":51740},"rest":"https://alion.io/mcp/rest/get_company?id=51740"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fionos-staff-software-engineer-fmd-virtual-network-functions"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fionos-staff-software-engineer-fmd-virtual-network-functions"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fionos-staff-software-engineer-fmd-virtual-network-functions"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/ionos-staff-software-engineer-fmd-virtual-network-functions\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fionos-staff-software-engineer-fmd-virtual-network-functions"}]}