Rensair is a high-growth technology company on a mission to decarbonise commercial real estate through smarter ventilation. Headquartered in London, with offices across the USA and Europe, we are scaling globally with our patented Smart Demand-Controlled Ventilation (SDCV) solution. Proven in the market, SDCV delivers substantial energy savings while improving indoor air quality, and is already trusted by leading clients including Salesforce, PwC, and Welltower. We have raised a Series A from Hoxton Ventures, a Tier 1 venture capital fund, to fuel our expansion.
Joining Rensair means working at the forefront of innovation in building efficiency, where innovation meets real-world impact. We combine deep technical expertise with a commercial mindset, moving quickly to capture a huge global opportunity. For ambitious people, this is a chance to be part of a dynamic, mission-driven team that is transforming how buildings are ventilated and operated.
POSITION OVERVIEW
We are seeking a Bookkeeper to join our London office and support our growing finance function. Reporting to the Financial Controller, the role will be responsible for day-to-day accounting, bookkeeping, and financial administration across our UK and international entities.
This position is ideal for candidates with 1-3 years of accounting experience. You will play a key role in maintaining accurate financial records, supporting month-end close, and ensuring our accounting systems reflect the company's rapid growth.
Experience with Xero is essential; experience with NetSuite or similar ERP systems is a plus.
KEY RESPONSIBILITIES
? Maintain accurate financial records in Xero, including posting invoices, receipts, and payments
? Manage inventory accounting and reconciliation: record inventory movements, reconcile stock, investigate variances, and coordinate with operations to resolve issues
? Validate and post employee expenses; ensure policy compliance and timely reimbursement.
? Reconcile bank accounts, credit cards, and intercompany transactions
? Process accounts payable and receivable, ensuring timely payments and collections
? Assist with month-end and year-end closing procedures, including accruals and prepayments
? Support preparation of VAT returns and compliance filings
? Liaise with external accountants, auditors, and suppliers
? Support process improvement, policy development, and automation within finance.
? Provide ad-hoc reporting and administrative support to the Financial Controller and management team
WHAT YOU BRING
? 1-3 years of experience in bookkeeping, accounting, or finance support roles.
We welcome early-career candidates. Internships/placements count if you handled AP/AR, bank recs, and basic journals.
? Proficiency with Xero; knowledge of NetSuite or other accounting platforms advantageous
? Strong Excel / Google Sheets skills and attention to detail
? Familiarity with UK VAT, accounting journals, and reconciliations
? Excellent organisational skills and ability to manage multiple priorities,
? Clear communication style and collaborative approach
? Qualifications: AAT Level 3 (completed or in progress) or equivalent; hands-on experience also considered
WHAT WE OFFER
Rensair is a high-growth start-up founded by experienced entrepreneurs. We have a unique opportunity to help our clients create safer and healthier indoor environments using proven technology while also decarbonizing their buildings and lowering running costs.
In addition to the opportunity to participate in our growth and the career potential that comes with it, we offer the following:
? Attractive salary
? Private medical insurance after probation period
? 25 days holidays + bank holidays, birthday leave
? Hybrid work: 3 days in the office
? Opportunity for advancement as the Company realizes its growth plan
? An entrepreneurial work culture, where proactive team players are rewarded for their drive and bringing their ideas to the table
? A friendly, fun and supportive team
? An opportunity to work on some of the most urgent challenges of our times -
clean air and achieving net zero for buildings
Rensair is an Equal Employment Opportunity and Affirmative Action Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status.
Send your application to Careers@rensair.com
Job Type: Full-time
Benefits:
Cycle to work scheme
Private dental insurance
Private medical insurance
Work from home
Education:
Diploma of Higher Education (required)
Experience:
hands-on bookkeeping: 1 year (preferred)
Microsoft Excel: 1 year (preferred)
Work authorisation:
United Kingdom (required)
Work Location: Hybrid remote in London WC1V
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