{"id":2986741,"url":"https://alion.io/job/lightning-ai-senior-network-engineer-infiniband-ufm-2","title":"Senior Network Engineer - InfiniBand / UFM","company":{"id":2736513,"name":"Lightning AI","domain":"pytorchlightning.ai","url":"https://alion.io/company/pytorchlightning","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Networking","role_family":"Networking","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":170000,"max":210000,"currency":"USD","period":"year","gross":null,"usd_annual":210000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"BGP","optional":false},{"name":"Git","optional":false},{"name":"Grafana","optional":false},{"name":"HPC","optional":false},{"name":"InfiniBand","optional":false},{"name":"Layer 2","optional":false},{"name":"Linux","optional":false},{"name":"NCCL","optional":false},{"name":"Prometheus","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"Terraform","optional":false},{"name":"PyTorch","optional":true},{"name":"PyTorch Lightning","optional":true}],"status":"live","first_seen_at":"2026-10-21T07:50:45Z","employer_posted_date":null,"last_verified_at":"2026-10-21T07:50:45Z","board_verified":false,"closed_at":null,"days_open":7,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":7},"description":"Who We Are\n\nLightning AI is the company behind PyTorch Lightning. Founded in 2019, we build an end-to-end platform for developing, training, and deploying AI systems—designed to take ideas from research to production with less friction.\n\nThrough our merger with Voltage Park, a neocloud and AI Factory, Lightning AI combines developer-first software with cost-efficient, large-scale compute. Teams get the tools they need for experimentation, training, and production inference, with security, observability, and control built in.\n\nWe serve solo researchers, startups, and large enterprises. Lightning AI operates globally with offices in New York City, San Francisco, Seattle, and London, and is backed by Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.\n\nThe Way We Work\nThe people who thrive here are builders who move fast, communicate openly, take ownership, and continuously improve themselves, their teams, and our company. Here's what that looks like in practice:\n\nMove with Urgency: We move quickly, make thoughtful decisions, and keep momentum. We value action over perfection and learn by shipping.\n\nTake Ownership: We own outcomes, not just our individual work. We make decisions that move the company forward and follow through.\n\nCommunicate Openly: We communicate directly, seek to understand, and create clarity for others. Honest conversations help us move faster together.\n\nBuild Great Teams: We lead by example, empower others, and create healthy teams where people can do their best work.\n\nRaise the Bar: We're always improving ourselves. We learn from feedback, consistently challenge ourselves to grow, and focus on the work that matters most.\n\nThink Long-Term: We design for what's next. We create scalable systems, simplify complexity, and use AI and automation to amplify our impact.\n\nWhat We Are Looking ForWe are seeking an experienced Senior Network Engineer (InfiniBand / UFM) to design, deploy, automate, and operate next-generation AI Factory networking infrastructure supporting large-scale GPU clusters. This role is responsible for building and maintaining high-performance NVIDIA Quantum InfiniBand fabrics that power AI training and inference environments utilizing NVIDIA UFM, NCCL, RoCEv2, and modern data center technologies.\nThe ideal candidate has deep expertise in InfiniBand networking, NVIDIA Unified Fabric Manager (UFM), large-scale GPU deployments, Linux networking, automation, and troubleshooting distributed AI workloads. The network is the foundation of distributed AI training. Performance bottlenecks at the fabric layer directly impact customer workloads. This role will shape how Lightning scales from tens of thousands of GPUs to significantly beyond — ensuring deterministic performance, predictable scaling, and enterprise-grade reliability. If you want to architect infrastructure that powers frontier AI research, this is the role for you.\nThis role may be fully remote within the U.S., or hybrid out of one of our office hubs (NYC, SF, Seattle, or London), with occasional team and company offsites. We are not able to provide visa sponsorship for this position at this time.\nWhat You’ll Do\nDesign, deploy, and maintain large-scale NVIDIA InfiniBand fabrics supporting AI/ML GPU clusters.\n\nDeploy and administer NVIDIA Unified Fabric Manager (UFM) Enterprise for monitoring, provisioning, telemetry, and fabric health.\n\nConfigure and optimize NVIDIA Quantum and Quantum-2 InfiniBand switches.\n\nTroubleshoot fabric performance issues impacting NCCL, MPI, GPUDirect RDMA, and AI training jobs.\n\nImplement and validate fat-tree, Dragonfly+, Clos, and spine-leaf network architectures.\n\nPerform firmware lifecycle management for InfiniBand switches, adapters (HCAs), and UFM infrastructure.\n\nOptimize congestion control, adaptive routing, QoS, and traffic engineering for high-performance GPU communication.\n\nWork closely with AI platform, GPU infrastructure, storage, and systems engineering teams to deploy scalable AI Factory environments.\n\nAutomate network provisioning using Python, Ansible, Git, REST APIs, and Infrastructure-as-Code methodologies.\n\nMonitor network health using UFM telemetry, Prometheus, Grafana, and other observability platforms.\n\nSupport high availability, maintenance windows, incident response, root cause analysis, and capacity planning.\n\nParticipate in architecture reviews and define networking standards for AI infrastructure.\n\nWhat You'll NeedRequired Qualifications\n7+ years of experience in large-scale data center networking.\n\nExperience deploying, operating, and troubleshooting InfiniBand environments.\n\nStrong understanding of Layer 2 and Layer 3 networking, including BGP, EVPN, VXLAN, and spine-leaf architectures.\n\nStrong Linux administration experience.\n\nExperience with network automation using Python, Ansible, Terraform, or similar tools.\n\nExperience with network troubleshooting, observability, and telemetry tooling.\n\nExcellent troubleshooting, documentation, and communication skills.\n\nIdeal Experience\nExperience with Netris, Terraform, or similar infrastructure tooling.\n\nExperience with multi-region backbone design.\n\nExposure to bare-metal provisioning systems.\n\nExperience operating HPC, GPU-dense, or other large-scale infrastructure environments.\n\nExperience working in high-growth infrastructure startups\n\nCompensation\nWe are committed to offering competitive compensation that reflects the value each team member brings to our mission. Final offers are based on factors such as experience, skills, geographic location, and role expectations. In addition to base salary, our total rewards package for eligible roles includes a discretionary bonus, a meaningful equity component, and comprehensive benefits.\n\nThe anticipated annual base salary range for this role is:\n$170,000—$210,000 USD\n\nBenefits and Perks\nWe offer a comprehensive and competitive benefits package designed to support our employees’ health, well-being, and long-term success:\n\nComprehensive Health Coverage: Medical, dental, and vision coverage for employees and eligible dependents.\n\nMeaningful Equity: RSUs that give employees a stake in the company's long-term success.\n\nRetirement Savings: 401(k) matching (U.S.) and pension contributions (U.K.).\n\nFlexible Time Off: Unlimited PTO, company holidays, and floating holidays to support work-life balance.\n\nCompany-Wide Winter Break: Two weeks of company closure each winter to disconnect and recharge.\n\nPaid Parental & Family Leave: Paid leave to support you and your family through life's important moments.\n\nProfessional Development: Annual learning and development allowance to support your professional growth.\n\nWellness Benefits: Wellness and work-from-home stipends to support your physical and mental well-being.\n\nSabbatical Program: Four weeks of paid sabbatical leave after four years of service.\n\nFlexible Work: Flexible schedules and a hybrid work model for our office-based teams.\n\nIn-Office Meals: Complimentary meals at our office hubs.\n\nBenefits may vary by location, team, and role.\n\nAt Lightning AI, we are committed to fostering an inclusive and diverse workplace. We believe that diverse teams drive innovation and create better products. We provide equal employment opportunities to all employees and applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected characteristic. We are dedicated to building a culture where everyone can thrive and contribute to their fullest potential.\n\nOriginally posted on Himalayas","description_format":"text","description_chars":7595,"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":["Equity","Flexible schedule","Flexible time off","Hybrid work","Office meals","Parental leave","Professional development","Unlimited PTO"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["MLOps","AI Development Tools"],"lifecycle":[{"event":"open","at":"2026-10-21T08:36:30Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":6,"expected_fill_days":29,"reasons":["seen:6","win:early"],"computed_at":"2026-10-28T05:59:10Z"},"pay":{"stated_usd_annual":210000,"is_top_pay":true},"html_url":"https://alion.io/job/lightning-ai-senior-network-engineer-infiniband-ufm-2","json_url":"https://alion.io/job/lightning-ai-senior-network-engineer-infiniband-ufm-2.json","meta":{"generated_at":"2026-10-29T04:31:44Z","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":7026,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-30T00:00:00Z"}},"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":2736513},"rest":"https://alion.io/mcp/rest/get_company?id=2736513"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flightning-ai-senior-network-engineer-infiniband-ufm-2"},{"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%2Flightning-ai-senior-network-engineer-infiniband-ufm-2"},{"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%2Flightning-ai-senior-network-engineer-infiniband-ufm-2"},{"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/lightning-ai-senior-network-engineer-infiniband-ufm-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flightning-ai-senior-network-engineer-infiniband-ufm-2"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":2986741}},{"tool":"search_jobs","arguments":{"company":"pytorchlightning.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":2986741},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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