• Monday to Friday 8.30am to 5.30pm, Saturday 8.30am to 12.30pm (Saturday in office when necessary, otherwise will be WFH)
• Ubi Ave // Work on site
• $2500 to $3500

Requirements:

• Possess an Electrical Engineering course or related fields.
• Possess at least 2-3 years of relevant working experience in M&E industry

Job Description

• Negotiate and prepare bids for tenders and contracts.
• Prepare tender and contract documents, including bills of quantities, quotations, and cost estimates.
• Manage project costing from early design plans to project completion.
• Conduct feasibility studies to estimate materials, time, and labour costs.
• Serve as the primary point of contact, conveying project updates to stakeholders.
• Document and track actions and decisions from stakeholder meetings.
• Formulate, maintain, and oversee project plans and schedules.
• Lead a team of Quantity Surveyors in pre-contract or post-contract and procurement administration.
• Collaborate with the Project Engineer and Architectural Supervisor to manage all M&E-related aspects.
• Source required materials and vendors, handle interim progress claims, variation orders, and subcontractor claims, and liaise with consultants and customers.

Tong Wei Chin (Reg No.: R24123803)

The Supreme HR Advisory Pte Ltd (EA No: 14C7279)

Senior Quantity Surveyor

Salary: $3000 - $5000

Working Hours: Monday to Friday, 9am to 6pm

Work Location: Bukit Merah Town Centre

Requirements:

• With more than 2 years of relevant working experience in a consultancy firm .
• Proficient in QS application and software.

Responsibilities:

• Involvement in the overall quantity surveying, cost & contract management of projects
• Feasibility studies & early cost advice.
• Preparation of cost estimate & cost plan
• Value management & cost management
• Advice and management of the overall procurement process
• Preparation of tender & contract documentation
• Evaluation of tenders received, analysis & reporting
• Measurement and taking-off of quantities and quantification of works done
• Valuation of progress payment claim, variation and final account
• Attendance to project & site meeting

Lee Wan Ling | Reg No: R23116154

THE SUPREME HR ADVISORY PTE LTD | EA No: 14C7279

Position: Senior Quantity Surveyor

• Salary: $3,000 - $5,000
• Monday to Friday (9am to 6pm)
• Location: Bukit Merah Town Centre

Requirements:

• With more than 2 years of relevant working experience in a consultancy firm .
• Proficient in QS application and software.

Responsibilities:

• Involvement in the overall quantity surveying, cost & contract management of projects
• Feasibility studies & early cost advice.
• Preparation of cost estimate & cost plan
• Value management & cost management
• Advice and management of the overall procurement process
• Preparation of tender & contract documentation
• Evaluation of tenders received, analysis & reporting
• Measurement and taking-off of quantities and quantification of works done
• Valuation of progress payment claim, variation and final account
• Attendance to project & site meeting

Chin Wai Loon Reg No: R24121618

The Supreme Hr Advisory Pte Ltd EA No: 14C7279

Job Description

• Report to HOD
• Obtaining quotations, liaising and negotiate with sub-contractors and suppliers
• Responsible for measuring quantities and taking off
• Prepare tender submission, handle progress claims / payment, VO & finalized project
• Handle on-going project and resolve contractual issues
• Good knowledge of structural works measurement
• To handle other assigned duties or related job as required
• 5 days work - 9 am to 6 pm

Requirements

• Diploma or Degree in Quantity Surveying / Civil Engineering or its equivalent
• Minimum 3 years working experience in similar field
• Able to work independentlly and under pressure
• Proactive and well organized

Roles & Responsibilities

- Draft and compile comprehensive tender documents including specifications, drawings, and scope of work.

- Conduct detailed cost estimations and evaluate tenders to ensure competitive and accurate bids.

- Manage contract agreements and ensure compliance with contractual terms.

- Develop detailed quotations for clients, ensuring accuracy and alignment with project requirements.

- Verify that all required documentation is complete and submitted in a timely manner to meet deadlines.

- Monitor and manage project costs to avoid overspending and ensure financial efficiency.

- Develop and manage project budgets, ensuring they align with financial constraints and objectives.

- Evaluate price comparisons and prepare summaries to support cost control measures.

- Draft and process variation orders for changes in project scope or requirements.

- Generate and submit monthly progress reports to support progress payment claims and project tracking.

- Assess and negotiate with proposed subcontractors in consultation with the project manager, ensuring cost-effectiveness and quality standards.

- Manage and finalize accounts for both main and subcontractors, ensuring all financial obligations are met and discrepancies resolved.

- Participate in project meetings as required, providing input on cost-related issues and project progress.

- Perform other duties as assigned, which may include ad-hoc tasks and responsibilities related to project cost management.

- Liaise with Engineers and Managers regarding their purchasing requirements.

- Source and negotiate for equipment and supplies.

- Evaluate suppliers based on quality standards, delivery, and prices.

- Process purchase requisitions and create purchase orders.

- Provide administrative support as assigned.

Job Requirements

- Minimum 4 years working experiences in Singapore construction industry and civil engineering work.

- Proficiency in Microsoft Excel, Word, Power Point & AutoCAD drafting.

Salary range: $3,000 - $5,000

Working days : 5 days (Mon-Fri 8.30am to 6pm)

Location: Near Novena MRT

Job Requirements:

• Minimum Diploma in Civil Engineering / Building / Quantity Surveying or equivalent
• Minimum 3 years of relevant work experience in construction industry
• Proficient in MS Office and other Measurement Software

Job scope

• Assist in preparation and submission of tender quotations and ensure timeline are met for every tender.
• Quantity take-off for all the tenders, in the form of manual measurement and update the amendment changes of the tender
• During tender stages, sourcing of quotation for rates and technical data are required due to every project’s requirement varies.

WhatsApp: +65 9642 0989 (Han)

Email: [email protected]

Chaw Chiaw Han, Reg No：R22106723

The Supreme HR Advisory Pte Ltd, EA No：14c7279

Senior Quantity Surveyor (Electrical)

5Days || 8.30am - 6pm (Mon - Fri)

Location: Bedok/Tanah Merah area (Project site)

$4,000 - $5,800 salary depending on experience & qualifications

Job Requirements:

• Must possess at least a Diploma in construction related field
• Those with a Diploma or Degree in electrical engineering will be an added advantage
• At least 2 to 3 years of hands-on working experience and proven track record
• Preferably with relevant work experience in the construction industry

Job Responsibilities:

Preparation of contract and negotiation with sub-contractors

Quantity surveying duties like

1. Variation works

2. Preparation of Letter of Award

3. Preparation of payment claims

4. Issuing payment response and

5. Any other works as and when assigned

Lee Wan Ling | Reg No: R23116154

THE SUPREME HR ADVISORY PTE LTD | EA No: 14C7279Lee Wan Ling | Reg No: R23116154

THE SUPREME HR ADVISORY PTE LTD | EA No: 14C7279

Senior Quantity Surveyor (Electrical)

5Days || 8.30am - 6pm (Mon - Fri)

Location: Bedok/Tanah Merah area (Project site)

$4,000 - $5,800 salary depending on experience & qualifications

Job Requirements:

Must possess at least a Diploma in construction related field

Those with a Diploma or Degree in electrical engineering will be an added advantage

At least 2 to 3 years of hands-on working experience and proven track record

Preferably with relevant work experience in the construction industry

Job Responsibilities:

Preparation of contract and negotiation with sub-contractors

Quantity surveying duties like

1. Variation works

2. Preparation of Letter of Award

3. Preparation of payment claims

4. Issuing payment response and

5. Any other works as and when assigned

Chew Xing Shan Reg No: R22107044

The Supreme HR Advisory Pte Ltd EA No: 14C7279

WhatsApp: +65 83592812 [Shannon]

Responsibilities:

• Assist in preparation and submission of tender quotations and ensure timeline are met for every tender.
• Quantity take-off for all the tenders, in the form of manual measurement and update the amendment changes of the tender
• During tender stages, sourcing of quotation for rates and technical data are required due to every project’s requirement varies.
• Arrange and carry out tender interview, negotiate of price with suppliers and subcontractors including of preparation of sub-contract agreement / letter of award.
• Monitoring progress claims and payments, sub-contractors payment, certification, VO submission and final accounts
• Assist in the settlement of final accounts with client, suppliers and subcontractors

Requirements:

• Minimum Diploma in Civil Engineering / Building / Quantity Surveying or equivalent
• Minimum 3 years of relevant working experience in QS works in Singapore construction firm.
• Proficient in MS Office and other Measurement Software

Job ID: L989X866

Please submit your updated resume in Word format by using the Apply Now Button.
We regret that only shortlisted candidates will be notified

Email resume to [email protected]

People Profilers Pte Ltd, 20 Cecil Street, #08-09, PLUS Building, Singapore 049705.
Tel: 6950 9740

http://www.peopleprofilers.com

EA License Number: 02C4944
Registration Number: R1330005
Posting Personnel: Reeve Lim Kok Kiong

The M&E Quantity Surveyor is responsible for managing all cost and contractual issues on main contract as well as sub-contracts connected to the project.

A summary of the responsibilities of this position are, and not limited to, as follows:

• Responsible for preparing progress payment claims, variation orders, project budgets & cost control and settlement of final account.
• Responsible for pre- & post-contracts administration and control.
• Conduct survey works during project tender stage.
• Produce pre-tender estimation, preparation of tender documents and maintenance of project documents.
• Source for suppliers and request for quotations.
• Conduct tender exercise such as selection of bidders, tender documentation, evaluation of tender submission and award of contract to successful bidder.

Value Add of Position

• Ability to identify potential and occurring problems that affect the schedule of works at site and recommend solutions to the relevant team.
• Ability to make correct decisions quickly.

Qualifications and Education Requirements

• Experience: 3 to 5 years of M&E Quantity Surveying experience.
• Familiar with relevant drawings, specifications and details.
• Experience in civil infrastructure project is an added advantage.

• Salary range: $3,000 - $5,000
• Working days : 5 days (Mon-Fri 8.30am to 6pm)
• Location: Near Novena MRT

Job Requirements:

• Minimum Diploma in Civil Engineering / Building / Quantity Surveying or equivalent
• Minimum 3 years of relevant work experience in construction industry
• Proficient in MS Office and other Measurement Software

Job scope

• Assist in preparation and submission of tender quotations and ensure timeline are met for every tender.
• Quantity take-off for all the tenders, in the form of manual measurement and update the amendment changes of the tender
• During tender stages, sourcing of quotation for rates and technical data are required due to every project’s requirement varies.

Tong Wei Chin (Reg No.: R24123803)

The Supreme HR Advisory Pte Ltd (EA No: 14C7279)

The M&E Senior Quantity Surveyor is responsible for managing all cost and contractual issues on main contract as well as sub-contracts connected to the project.

A summary of the responsibilities of this position are, and not limited to, as follows:

• Responsible for preparing progress payment claims, variation orders, project budgets & cost control and settlement of final account.
• Responsible for pre- & post-contracts administration and control.
• Conduct survey works during project tender stage.
• Produce pre-tender estimation, preparation of tender documents and maintenance of project documents.
• Source for suppliers and request for quotations.
• Conduct tender exercise such as selection of bidders, tender documentation, evaluation of tender submission and award of contract to successful bidder.

Value Add of Position

• Ability to identify potential and occurring problems that affect the schedule of works at site and recommend solutions to the relevant team.
• Ability to make correct decisions quickly.

Qualifications and Education Requirements

• Experience: 3 to 5 years of M&E Quantity Surveying experience.
• Familiar with relevant drawings, specifications and details.
• Experience in civil infrastructure project is an added advantage.

• Location: Office at Keppel Distripark, Singapore
• Working Location: Islandwide [On ship]
• Working Days: 5 Day A Week
• Working hours : 0830 hrs to 1730 hrs [Prepared to work irregular hour due to ship schedule/Public Holiday]
• Salary : Basic $2300 excluding overtime

Job Scope

• To attend / carry out various types of survey on board ship and sites on cargo, cargo measuring equipment and marine related activities.
• To perform marine survey onboard vessels and cargo inspection on sites in order to assess and report on their condition for insurance claim.
• To verify the equipment onboard vessel to ensure compliance with various standards or specifications.

Job Requirement

• Nitec/ITE related in marine or Diploma in Nautical, Maritime Studies, Marine Engineering or Marine related from a local polytechnic/private institution.
• Experience onboard vessel will be an advantage.
• Prepare to work at irregular hours including Public Holidays due to ship schedule.
• Opportunity to travel overseas upon satisfactorily performance and skill.
• Successful candidate will be on six months' probation.

Tong Wei Chin (Reg No.: R24123803)

The Supreme HR Advisory Pte Ltd (EA No: 14C7279)

• Good knowledge of contract and QS procedures and pricing.
• Experienced in procurement, budgeting, estimation, contract administration, measurement of quantities & variation orders
• Compile photos, inspection forms and all relevant documents required for VOs attachment.
• Strong interpersonal, communication & negotiation skills
• Prepare tender documents, contracts, budgets, bills of quantities and other documentation
• Any other ad-hoc tasks assigned by Superior.

• Good knowledge of contract and QS procedures and pricing.
• Experienced in procurement, budgeting, estimation, contract administration, measurement of quantities & variation orders
• Compile photos, inspection forms and all relevant documents required for VOs attachment.
• Strong interpersonal, communication & negotiation skills
• Prepare tender documents, contracts, budgets, bills of quantities and other documentation
• Any other ad-hoc tasks assigned by Superior.

• Monday to Friday 8.30am to 5.30pm, Saturday 8.30am to 12.30pm (Saturday in office when necessary, otherwise will be WFH)
• Ubi Ave 1, Singapore // Work on site
• $2500 to $3500

Requirements:

• Possess an Electrical Engineering course or related fields.
• Possess at least 2-3 years of relevant working experience in M&E industry

Job Description

• Negotiate and prepare bids for tenders and contracts.
• Prepare tender and contract documents, including bills of quantities, quotations, and cost estimates.
• Manage project costing from early design plans to project completion.
• Conduct feasibility studies to estimate materials, time, and labour costs.
• Serve as the primary point of contact, conveying project updates to stakeholders.
• Document and track actions and decisions from stakeholder meetings.
• Formulate, maintain, and oversee project plans and schedules.
• Lead a team of Quantity Surveyors in pre-contract or post-contract and procurement administration.
• Collaborate with the Project Engineer and Architectural Supervisor to manage all M&E-related aspects.
• Source required materials and vendors, handle interim progress claims, variation orders, and subcontractor claims, and liaise with consultants and customers.

Tong Wei Chin (Reg No.: R24123803)

The Supreme HR Advisory Pte Ltd (EA No: 14C7279)

• Responsible for taking off quantities, sourcing sub-contractors & suppliers, pricing and preparation of tender submission.
• Carry out site measurement and evaluate price comparison and costing summary.
• Project administration and documentation including preparation of interim valuations, pricing and agreement of contract variations, update claim submissions, preparation of final accounts.

Requirements:

• Diploma in Quantity Surveying or equivalent.
• At least 4 years working as a Quantity Surveyor in building construction industry.
• Strong knowledge of building condition of contract.

If you are keen to apply for the position, kindly email your detailed resume in MS Word to [email protected]

Please note that only shortlisted candidates will be notified.

For more job opportunities, please visit our website at www.recruit-expert.com

EA Licence: 19C9701

Registration: R1326740

The Quantity Surveyor reports to the Senior Quantity Surveyor and assists in all costs and contractual issues in Main Contract as well as Sub-Contracts connected to the project.

A summary of the responsibilities for this position is, and not limited to, as follows:

Job Description

• Ensure accurate measurement of quantities to assist in the preparation of progress payment claims, variation order claims and payments to subcontractors and suppliers including all final accounts;
• Involve in preparing regular cost reports including maintenance budget cost controls;
• Assist in maintaining good documentation of events at site for variation order / EOT claims;
• To work closely with the site storemen to ensure proper documentation of materials control;
• Be familiar with the specifications and scope of works at various stages of the project so as to be able to advise the structural, architectural and M&E coordinators on the contracted design requirements;
• Assist in the procurement of sub-contractors and suppliers of specified materials;
• Attend technical meetings to keep abreast of design development issues and provide cost escalation alerts;
• Learn and be adequately briefed on the contractual / legal rights of the Main Contractor in order to advise colleagues at site and the management on any choke points during the project.

Value Add of Position

• Help the project’s bottom line by rigorously monitoring and implementing cost controls;
• Establish a good relationship with Client, Consultants and subcontractors to ensure that the project is smoothly managed in terms of resources and timeline.

Technical Competencies

• Good knowledge of materials and construction at site;
• Strong measurement skill;
• Ability to use measurement software;
• Good understanding of the principles of contracts

Qualifications and Education Requirements

• Degree/Diploma in Quantity Surveying, Building or Civil Engineering
• Minimum 1 year of working experience in tendering, estimating and measurement of quantities in buildings projects worth at least S$25 million.
• Good analytical skills

1. To assist the Contract Department and Procurement Department in negotiating with the main contractor on VO and EOT
2. To assist the M&S Department in quantifying all VOs and negotiating with M&E contractors and contractual matters
3. Prepare budget and cost control monitoring to ensure the project cost is within the allocated budget
4. Prepare and analyze cost comparison
5. Prepare, evaluate, and recommend on the award of Sub-contractors
6. Responsible for measuring quantities and taking off
7. Prepare Variation Orders, claims, final accounts, settlement, and sub-contractor payments
8. Preparation of Monthly Progress claims, variation orders and payments to subcontractors
9. To negotiate on pricing
10. Handle any other ad-hoc duties and tasks assigned by management or supervisor

Requirements:
1. Diploma/Degree in M&E Engineering/ Quantity Surveying or equivalent
2.Minimum 8-10 years of M&E Quantity Surveying experience within the Construction industry
3. Experienced in tendering and QS works and competent in contractual management.

The Quantity Surveyor reports to the Senior Quantity Surveyor and assists in all costs and contractual issues in Main Contract as well as Sub-Contracts connected to the project.

A summary of the responsibilities for this position is, and not limited to, as follows:

Job Description

• Ensure accurate measurement of quantities to assist in the preparation of progress payment claims, variation order claims and payments to subcontractors and suppliers including all final accounts;
• Involve in preparing regular cost reports including maintenance budget cost controls;
• Assist in maintaining good documentation of events at site for variation order / EOT claims;
• To work closely with the site storemen to ensure proper documentation of materials control;
• Be familiar with the specifications and scope of works at various stages of the project so as to be able to advise the structural, architectural and M&E coordinators on the contracted design requirements;
• Assist in the procurement of sub-contractors and suppliers of specified materials;
• Attend technical meetings to keep abreast of design development issues and provide cost escalation alerts;
• Learn and be adequately briefed on the contractual / legal rights of the Main Contractor in order to advise colleagues at site and the management on any choke points during the project.

Value Add of Position

• Help the project’s bottom line by rigorously monitoring and implementing cost controls;
• Establish a good relationship with Client, Consultants and subcontractors to ensure that the project is smoothly managed in terms of resources and timeline.

Technical Competencies

• Good knowledge of materials and construction at site;
• Strong measurement skill;
• Ability to use measurement software;
• Good understanding of the principles of contracts

Qualifications and Education Requirements

• Degree/Diploma in Quantity Surveying, Building or Civil Engineering
• Minimum 1 year of working experience in tendering, estimating and measurement of quantities in buildings projects worth at least S$25 million.
• Good analytical skills

Job Details:

• Salary: FIXED $3,000 per month
• Office Location: Clarke Quay area (Mostly Islandwide due to field visit)
• Working Period: Immediate till December 2024 (renew or extend depending on project requirements)
• Working Days: 5 days work per week Monday – Sunday (Based on duty roster). Up to 44 hours per week

Responsibilities:

• Conduct survey interviews via outbound calls and field visits to collect timely and reliable data
• Handle incoming hotline and mailbox enquiries to resolve respondents’ issues
• Compile, record, input survey returns and data accurately into the system
• Conduct data verification of completed survey cases to ensure accuracy and reliability of data
• Establish and maintain relationship with respondents throughout the project period
• Ensure that the given KPI are being met based on the project timeline
• Provide status report to the supervisor

Requirements:

• Strong phone and verbal communication skills along with active listening
• Experience with Key Performance Indicators (KPIs) preferred
• Willing and able to persuade respondents to participate in surveys
• Able to work in high pressure, stressful situations
• Selected candidates are required to complete the training course and passed the tests based on the given criteria

Interested candidate please click "APPLY"to begin your job search journey and submit your CV directly through the official PERSOLKELLY job application platform - GO Mobile.

Should you be interested in this position, please contact Coco at 8121 4759 your resume directly for fast respond.

We regret to inform that only shortlisted candidates will be notified.

By sending us your personal data and curriculum vitae (CV), you are deemed to consent to PERSOLKELLY Singapore Pte Ltd and its affiliates to collect, use and disclose your personal data for the purposes set out in the Privacy Policy available at https://www.persolkelly.com.sg/policies. You acknowledge that you have read, understood, and agree with the Privacy Policy.

PERSOLKELLY Singapore Pte Ltd • RCB No. 200007268E • EA License No. 01C4394• Reg. R23117223 (Poh Siew Ling)

• Responsible for taking off quantities, sourcing sub-contractors & suppliers, pricing and preparation of tender submission.
• Carry out site measurement and evaluate price comparison and costing summary.
• Project administration and documentation including preparation of interim valuations, pricing and agreement of contract variations, update claim submissions, preparation of final accounts.

Requirements:

• Diploma in Quantity Surveying or equivalent.
• At least 4 years working as a Quantity Surveyor in building construction industry.
• Strong knowledge of building condition of contract.

If you are keen to apply for the position, kindly email your detailed resume in MS Word to [email protected]

Please note that only shortlisted candidates will be notified.

For more job opportunities, please visit our website at www.recruit-expert.com

EA Licence: 19C9701

Registration: R1326740

Job Description :

1.To study structural and architectural drawings, do pre-computation work

2.Obtain survey data from Registered Surveyors and Local Authorities

3.Update construction drawings for site instructions (M&E, ARCHI, STRUCTURE)

4.Coordinate daily work progress with site surveyors

5.Prepare for all as-built plan for TOP clearance

6.Coordinate with Registered surveyor, consultant, architect to resolve drawing discrepancies.

7.Perform any other duties as and when required.

Qualifications：

1.Diploma/bachelor’s degree with a major in surveying or qualification in Land or Engineering Surveying, or any other related qualifications

2.Minimum of 5 years’ construction survey experience

3.Understanding of survey equipment hardware and software

4.Knowledge of machine control functions and settings

5.Understanding of accuracy, tolerances, basic QA/QC and essential documentation

6.Work effectively with those of diverse backgrounds and organisational levels

7.Adaptive, effective communication and active listening skills

Job Title: Senior Quantity Surveyor (Renovation) (ID7124)
Location: Kaki Bukit
Working Hours: Mon to Fri, 9am-6pm, Alternate Sat, 9am-1pm
Salary: $3500 to $6000
Benefits：AL from 14days, AWS

Job Description
• Support the management team in leading the project QS team and preparing cost budgets, cash flows, and claims.
• Ensure timely awarding of subcontracts and supplier agreements, coordinating with the technical team to meet specifications.
• Prepare quantity measurements, drawings, and cost analyses based on project needs.
• Analyze and negotiate quotations, attend site meetings, and review agreements.
• Certify progress work, handle contract variations, and submit monthly progress claims.
• Finalize subcontract and main contract accounts and advise clients on cost feasibility.
• Prepare OMM before project handover, certify final valuations, and act as financial advisors.
• Be ready to work extra hours for urgent projects and perform other assigned duties.

Requirement:
• Degree or Diploma in Building/ Quantity Surveying with min 3-5 years’ experience in QS renovation/Interior Design/HDB A&A project.
• Well-versed in both Contracts Administration and Tenders
• Proficient in MS Excel and AutoCAD and the ability to learn new specialist software
• Possess good negotiation and coordination skills
• Good interpersonal skills, able to communicate with people from all levels.
• Meticulous, analytical with excellent problem-solving skills, proactive, good team player and able to meet tight deadlines
• Able to work independently with minimum supervision
• Able to supervise and motivate subordinates with the objective to form a strong team.

Job Title: Quantity Surveyor (ID8177)
Location: Kranji, Singapore
Working Hour: Monday – Friday 8am -5:30pm
Salary: $2800 - $3500

Job Description:
• Supporting and reporting to Director and Asst. QS Manager
• To perform the full spectrum of duties required of as a quantity surveyor
• To be in control and responsible for the management of all contracts/sub-contracts activities
• including, meeting project budget, ensure profitability, terms and conditions of the contract/
• sub-contract, schedule procurement activities to meet projects deadline.
• To oversee, lead and manage the qs team for the overall direction, coordination, execution
• of the projects from tender development to inception of construction to final completion of the
• Projects.
• To oversee, lead and manage the purchase team for the overall direction, development to inception of
• construction to final completion of the project.

Requirement:
• At least 1 years Quantity Surveyor working experience