Workplace & Culture Manager

Job Title: Workplace & Culture Manager Reports to: People Manager Location: London onsite 3 days About Radiant Radiant is redefining how AI infrastructure is built. We design and operate AI-native cloud platforms engineered for sovereignty, performance, and scale. Our infrastructure powers GPU-native workloads, multi-tenant control planes, and high-performance AI systems designed for the most demanding environments. We are not building a generic cloud. We are building purpose-built AI infrastructure — from powered land, to compute, to software. As we scale, we're building this organisation from the ground up. We're looking for people who'd rather build the playbook than inherit one — who are comfortable doing the work themselves as well as directing others, and who can adapt as fast as our strategy does. This is a startup model: attitude and adaptability matter more to us than years of experience or the size of the team you've previously managed. About the role Radiant is looking for an organised, proactive Office Manager to keep our office running smoothly and support the wider team's day-to-day needs. This role blends two things: office management (space, supplies, vendors, facilities) and operations support (scheduling, correspondence, administrative processes). You'll be the first point of contact for the office and a key enabler for the rest of the team, working onsite/hybrid from our London office. What you'll do Workplace Operations Manage day-to-day office operations, including supplies, equipment, facilities, and vendor relationships. Maintains office supply stock (takes inventory, orders supply, and handles delivery) and manages local budget for orders Provide day-to-day administrative and operational support to the operations team and other departments as needed. Coordinate scheduling and calendar management for senior staff, including booking meetings, meeting rooms, and travel arrangements. Handle the compliance layer that sits under the agreements — liability cover for the spaces we occupy, the health and safety obligations each agreement places on us, DSE and home-working assessments, first aid and fire arrangements. Reviewing a vendor or office lease agreement and maintaining a single source of truth for each agreement — term dates, notice periods, break clauses, rent and service charge, desk counts, meeting-room credits, what is included and what is billed on top. Own the workplace budget: forecast it, track against it, and give Finance a clear view of committed spend and what is coming up for renewal. Employee Experience & Culture New joiners: Support onboarding and offboarding of new employees — desk setup, equipment provisioning, welcome packs, and first-day logistics. Provide general administrative and operational support to leadership and cross-functional teams as needed. Partner with People Team and leadership to align culture initiatives with broader business goals and people strategy Efficiency & Process Improvement Continuously review and improve workplace and operational processes to drive efficiency, reduce friction, and enhance the employee experience Develop and maintain clear SOPs and playbooks for all core workplace and culture operations, ensuring consistency across sites About You Around 5 years of experience in a scale up workplace, office management, people operations, or culture-focused role, ideally within a multi-site environment Proven track record of managing office portfolios and delivering high-quality employee experiences at scale A natural people-person with strong interpersonal skills and the ability to build trusted relationships at all levels of the business Highly organised with exceptional attention to detail and the ability to juggle multiple priorities simultaneously Strong written and verbal communication skills, with the ability to engage and influence stakeholders across the business Commercially minded, with experience managing budgets and vendor negotiations Experience with workplace technology and ticketing systems. Knowledge of health & safety, ESG, and CSR best practices is desirable.