CarmichaelUK are recruiting for a Senior Quantity Surveyor to join the HS2 Commercial team based in Brackley. This is a fantastic opportunity to work on one of the most significant infrastructure projects in the UK, supporting the commercial delivery of major civils, earthworks, and structural packages under the NEC contract. You ll be part of a collaborative, high-performing commercial team, ensuring value, compliance, and effective cost control across key construction phases. You will carry out tasks independently, at times this will involve leading a small group of commercial staff and also carrying out both periodical duties and one-off tasks in accordance with deadlines as directed by the senior Commercial team. Your duties will include Prepare and agree variation accounts for main contract and sub-contracts. Monitor cost against targets and contract progress against accepted programmes and work plans in conjunction with other team disciplines. Provide input into change control procedures for EOT, delays and performance adjustment. Prepare and agree interim valuations, final valuations, final accounts and sub-contract final accounts. Prepare and issue certification and payment of sub-contractors. Provide contractual advice to management (ensure compliance with contract and legal administration obligations e.g. Timely issue of relevant notices). Negotiate and progress the resolution of any disputes and identify potential commercial risks and evaluate options for th