Total 14,931 job vacancies in Singapore

Project Manager

Work Location: Changi

Project Office at 33 Maude Rd, Singapore 208344 (Lavender area)

Working days: 5.5 days 8am to 5pm, alt sat full day

Salary: $8000 to $13000 (depends on experience)

Requirement

• Masters/Degree in Civil & Engineering or equivalent, recognized universities under the BCA is a plus.
• Minimum 10 years of Experience.
• Experience in Civil Works, Dredging, revetment, construction of pier/wharf.
• Proficient in Microsoft Office, MS Project, Primavera and AutoCAD.

Job scope

• Carry out project planning, scheduling, cost control, good documentation system and project management.
• Meet with clients to take detailed ordering briefs and clarify specific requirements of each project.
• Responsible to participate in the contract review to evaluate company’s capability to fulfil contract order requirements that include involvement in the tender clarification meeting with the prospective client.
• Ensure that all aspects meet the government regulations and standards, including safety of works, inspections and testing of equipment and machinery, training needs of staff.
• Control and monitor work progress and ensure work quality.
• Oversee the effective management of project activities to assure timely delivery and low wastage.
• Overall planning and controlling of the cost of project execution.
• Manage and lead a group of engineers and construction managers.
• Overall co-ordination of the work progress of large and complex projects.
• Co-ordination with other departments on issues affecting project work.
• Liaise with government/statutory authorities, consultants, clients, suppliers etc.
• Provide timely project progress reporting to management.
• Attending project execution meetings.
• Responsible for application for the required consent / permits from the relevant statutory board or regulatory body – e.g. Port Singapore Authority (PSA), ministry of manpower.
• Detect project problems and ensure effective corrective measures are executed.
• Other ad-hoc duties required to carry out.

Cheong Yeat Long | R25145358

The Supreme HR Advisory Pte Ltd | EA 14C7279

Taxation Accountant / Manager

Working Days: 5 Day A week
Working hours: 8:00am-5:00pm or 9:00am-6:00pm
Working Location: Pandan Road Singapore 609271
Salary: $4000 above 
Company Transport will be provided when candidate choose 8:00am-5:00pm working hours.

Responsibilities

• Oversee all tax compliance matters, including corporate income tax, withholding tax, indirect taxes, and transfer pricing.
• Prepare and/or review annual tax returns, ensuring full compliance with applicable tax laws and regulations.
• Prepare and review monthly tax provisions and tax accounting reports, including deferred tax computations.
• Conduct tax research and identify opportunities for tax planning and process improvements.
• Liaise with relevant authorities on tax-related queries, audits, and investigations.
• Provide advice and support on tax compliance requirements and implications as needed.
• Review and advise on tax-related clauses in contracts, including project tenders and procurement agreements.
• Stay updated on new tax legislation and regulatory changes, ensuring timely implementation and compliance.
• Perform ad-hoc duties and tasks as assigned.

Requirement:

• Minimum 5 years of relevant experience in taxation, customs, and finance.
• Candidates with over 5 years of tax experience in commercial or professional firms are preferred.
• Prior experience in audit or tax firms is an advantage.
• Background in tax consultancy is highly desirable.
• Degree in Business, Accounting, or a related field.
• Knowledge of Singapore and Indonesia tax regulations is preferred.
• Proficient in Microsoft Excel.

WhatsApp me your resume for quicker processing! ☺️

WhatsApp: https://wa.me/6584067823 (Shiro)

SHEE YOKE RU|R26161758 | The Supreme Hr Advisory Pte Ltd EA No: 14C7279

Salary: $5,000 – $6,000 
Working Hours: Mon – Fri | 9am - 6pm
Location: Telok Ayer

Responsibilities 

• Own the portfolio of IT vertical accounts end-to-end on the commercial side: relationships, rates, scope, escalations and growth. 
• Receive newly won accounts from the business development team and onboard them properly – quickly assigning ownership, introducing the team, and putting a maintenance plan in place. 
• Grow accounts through lane expansion, new geographies and value-added scope-ups (IOR/EOR, ITAD). 
• Identify and pursue opportunities within your book. 
• Protect margins and cash. 
• Quote with discipline, manage scope creep, keep an eye on billing and ageing receivables on accounts. 
• Flag anything that risks profitability or collection. 
• Work closely with the SOE and operations teams on quotations and execution.
• Forecast, report & maintain visibility on revenue, pipeline conversion and expected workload for own accounts.

Requirements

• 5 years in account management within freight forwarding, logistics or supply chain.
• Experience managing customer accounts directly, including commercial discussions, service issues, escalation handling and follow-up with key stakeholders.
• Experience handling freight/logistics quotations, rate negotiation, margin management, contract terms and commercial pricing discussions.

The Supreme HR Advisory Pte. Ltd || 14C7279

Chua Jie Ying (Cai Jie Ying), Evelynn || EA Personnel License R24120580

Manager, Spare Parts Sales

• Working Location: Gul Circle
• Working Hours: 5 days, Mon - Fri, 8:00am – 5:30pm
• Salary: $5,800 to $7,000

The company is a lifting accessories supplier that provides container-handling solutions to ports and terminals. With operations in more than 70 countries across six continents, it has established a presence in terminals of every scale.

Requirements:

• Degree in Business, Sales, Marketing, or related field
• 8-10 years of proven experience in Parts Sales and Inventory Management within automotive, heavy equipment, or industrial parts industries
• Experience in automotive dealerships, heavy equipment or distribution network is required for this role.

Responsibilities

Strategic Planning & Sales Growth

• Formulate and implement sales and business plans to drive revenue and profitability.
• Monitor, track, and review sales performance, taking corrective actions where necessary.
• Lead sales initiatives in coordination with the team to expand aftermarket parts revenue.

Marketing & Customer Engagement

• Develop and execute marketing strategies to retain existing customers and acquire new ones.
• Strengthen competitiveness and grow market share in parts sales.
• Address customer complaints promptly to ensure high satisfaction.

Aftersales & Service Integration and Refurbishment Business

• Systemize tracking of new equipment service schedules to proactively target customers.
• Develop service-related parts sales opportunities to maximize lifecycle revenue.

Inventory Management

• Oversee global inventory to ensure availability and meet delivery commitments.
• Establish stock level and replenishment procedures to optimize lead times.
• Proactively manage inventory to minimize surplus and avoid obsolescence.

Interested applicants kindly submit your resume through here or Whatsapp +65 9019 3218 (Joevy), and allow our Consultant to match you with our Clients. No Charges will be incurred by Candidates for any service rendered.

Tan Yu Jing Reg No: R26161199

The Supreme HR Advisory Pte Ltd EA No: 14C7279

• Drive ticketing revenue and optimize ticketing operations across a diverse portfolio of high-volume events.
• Develop and implement pricing, demand management, and sales strategies to maximize attendance and revenue performance.
• Design ticket pricing structures, including tiered pricing, bundles, promotional packages, and premium offerings.
• Manage end-to-end ticketing operations, including system setup, inventory management, event configuration, and vendor coordination.
• Oversee ticket distribution across multiple sales channels, including online platforms, on-site sales points, and third-party partners.
• Collaborate closely with marketing teams to align ticket launch strategies with promotional campaigns and maximize conversion rates.
• Monitor ticket sales performance, forecast demand, and provide regular revenue and attendance reports.
• Analyse sales trends and customer purchasing behaviour to identify opportunities for revenue growth.
• Prepare post-event reports and insights to support future ticketing and commercial strategies.
• Manage ticketing-related customer enquiries and issue resolution to ensure a positive customer experience.
• Coordinate event-day ticketing operations, admissions, and entry management to ensure smooth event execution.
• Maintain accurate ticketing records and ensure compliance with operational and financial procedures.

Yee Jie Ling Jaslin (R1440114)
Business Edge Personnel Services Pte Ltd (96C4864)

Job description 

• Assist the Lead Consultant in project management and daily operations. 

• Oversee site planning, including facilities, hoarding, access, and crane requirements. 

• Evaluate project programmes and monitor work progress. 

• Ensure workplace safety, health, and environmental measures are implemented effectively. 

• Arrange mock-ups, sample unit inspections, and trade demonstrations. 

• Coordinate submissions and queries from contractors, ensuring timely responses from consultants. 

Requirements 

• Possess an Architectural, Civil / Structural / Electrical / Mechanical / Environmental Engineering, Building Science, Project Management, Construction Management or other construction and engineering related degree. 

· Good Pay + Good allowance + Good Bonus 

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls) 

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 ) 

Project Management & Execution

• Oversee full project lifecycle from design, tender, and construction to handover.
• Ensure compliance with quality assurance (QA) and health & safety (HSE) requirements.
• Conduct design and site coordination meetings with clients, consultants, and site teams.
• Review design drawings for constructability and value engineering opportunities.
• Monitor site progress, schedule adherence, and cost performance.
• Lead project reviews, manage variations, and resolve site issues promptly.

Requirements:

• Degree / Diploma in Construction, Civil Engineering, Quantity Surveying, or Architecture.
• Minimum 5 years of experience in building or construction project management.

· Good Pay + Good allowance + Good Bonus

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls)

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 )

Project Management & Execution

· Oversee full project lifecycle from design, tender, and construction to handover.

· Ensure compliance with quality assurance (QA) and health & safety (HSE) requirements.

· Conduct design and site coordination meetings with clients, consultants, and site teams.

· Review design drawings for constructability and value engineering opportunities.

· Monitor site progress, schedule adherence, and cost performance.

· Lead project reviews, manage variations, and resolve site issues promptly.

Requirements:

· Degree / Diploma in Construction, Civil Engineering, Quantity Surveying, or Architecture.

· Minimum 5 years of experience in building or construction project management.

· Good Pay + Good allowance + Good Bonus

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls)

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 )

☑ Good Bonuses

☑ Near MRT

☑ Family Friendly Environment

Job Description:

• Lead and manage SOC team resources to ensure 24x7 security event monitoring, incident response, and timely escalation of cyber threats.
• Maintain and enhance SIEM/SOAR platforms, including fine-tuning detection rules, log ingestion, and ensuring high availability and disaster recovery.
• Lead forensic investigations, threat hunting for IOCs and TTPs, and drive end-to-end SOC capability uplift projects.
• Prepare and present detailed incident reports, including root cause analysis and remediation recommendations, to management.

Requirements:

• At least a degree in Computer Science or related certifications.
• Strong hands-on expertise in SIEM/SOAR operations, incident response methodologies, and defence solutions across host-based and network-based layers.
• Familiarity with Singapore regulatory frameworks (Cybersecurity Act 2018, MAS TRMG, CCoP) and industry frameworks such as MITRE ATT&CK, OWASP Top 10, and Cyber Kill Chain.
• Proven team leadership with direct reporting experience.

To apply, please include the following details inside your CV for faster processing:

• Reasons for leaving each past & current employment
• Salary drawn for each past & current employment
• Expected Salary
• Earliest availability date

We regret that only short-listed candidates will be contacted shortly.

Loh Puay Hwee David

EA License | 24C2215

EA Registration Number | R1766892

Job Scope:

• Oversee day-to-day operations of outsourced projects.
• Develop and implement operational policies, procedures, and best practices.
• Lead, manage, and develop team performance through coaching and evaluations.
• Allocate and optimise manpower and resources to meet service demands.
• Review and improve workflows to enhance efficiency and productivity.
• Ensure service quality standards are met or exceeded.
• Drive corrective and preventive actions for quality issues.
• Ensure compliance with relevant health, safety, and regulatory requirements.
• Manage vendor relationships to support effective service delivery.
• Monitor and report key performance indicators (KPIs) to management, with actionable insights.

Requirements:

• Bachelor's degree
• 5 years of hands on experience in ground operations management
• Proven track record of implementing process improvements and driving operational excellence.
• Knowledge of Six Sigma methodologies to drive process excellence will be advantageous.
• Strong leadership, organizational, and problem-solving skills

Kindly email your resume to vivien.khaw@tg-hr.com

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

Plan, design and direct construction activities, to ensure safe and timely delivery and completion of development works.

• Present management reports pertaining to progress of projects, personnel performance and problems encountered and appropriate and effective solutions.

• Cover site activities and documents, and timely report to management

• Direct all site activities of site staff, contractors, and suppliers, etc., and manage the communication between different groups to ensure timely response to project requirements.

• Manage and deliver projects within project timeline and budget, as well as the framework of risk and environmental considerations.

• Manage work delivery and resources based on the resource allocation and project schedules.

Requirements

• Candidate must possess at least Bachelor's Degree/Post Graduate Diploma/Professional Degree in Engineering (Civil), Quantity Survey, Architecture or equivalent.

• At least 5 Year(s) of working experience in the related field is required for this position.

• Preferably Manager specialized in Engineering - Civil/Construction/Structural or equivalent.

• Experienced in Structural and Architecture works will be preferred,

· Good Pay + Good allowance + Good Bonus

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls)

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 )

• Well established Main Contractor

• Government and Private Building projects

• Challenging and Rewarding career

• Senior PM positions available

Our client is seeking for suitable candidates to join them as Project Manager.

Responsibilities:

· Lead and manage project team

· Execute projects according to Schedule and Tender Specifications within Contract Budget

· Plan and update master programme

· Preparation of Progress Reports

· Troubleshoot and recover from unexpected delays

· Resolve on-site Contractual Issues

· Coordinate works between Clients, Consultants, Sub-contractors, Suppliers

Requirements

· Degree or Diploma in Civil Engineering

· Min 5 years of working experience in construction industry

· Experienced in HDB / Condo / Commercial projects

· Good Pay + Good allowance + Good Bonus

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls)

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 )

• Liaise closely with subcontractors, architects, consultants and authorities; set guidelines and provide expertise and supervision to the team
• Verify the overall list of errors, construction detail and design, defects and variations based on construction plans and drawing designs before construction and or processing payment to subcontractors
• Manage people and organisational functions such as perform on-the-job coaching and to track employees’ productivity.
• Plan, forecast and track sub-contractors work progress, provide weekly scheduling and conduct daily coordination meeting to ensure project target timeline are met by sub-contractors, including logistic arrangement for daily operation needs.
• Drive continuous improvement initiatives

Job Requirements

• Possess a degree in Civil Engineering with at least 6 years of relevant working experience, preferably with a main contractor
• Experience in managing deliverables and milestones: on time/within budget/meeting business needs

Good Pay + Good allowance + Good Bonus

· Interested candidates please send an updated Resume / CV in Ms Word format to lilian@recruitflash.com or WhatsApp’s your resume to 98332779 ( no Calls)

· Consultant in-charge : Quah Li Lian (Lilian) ( Registration No: R1983286 )

Key Responsibilities

• Lead the full bill adjustment process: review, validate documents and correct bill discrepancies in the system, and ensure accuracy and timelines

• Manage and coach customer liaison officers to handle walk-in enquiries and reply within service standards

• Handle escalated cases and ensure prompt effective resolution

• Identify process gaps, improve, and streamline processes to enhance patients’ satisfaction and experience

• Collaborate with internal departments / teams to ensure compliance to billing policies, governance requirements, and service-level agreements

Interested candidates, please forward your resume to jalenetan@recruitexpress.com.sg

Consultant: Jalene Tan (R26160390)
Recruit Express Pte Ltd (99C4599)

Job Description:

• Process vendor invoices, payments and passing entries
• Process staff claims and passing entries
• Prepare monthly movement report
• In charge of daily nostro reconciliation
• Prepare audit confirmations

Application Procedures

Interested candidates, please email your resume to:

Attention: Jamie Tan Pei Zhen (CEI No. R2199473)

jamietan@recruitexpress.com.sg

Recruit Express Pte Ltd (EA No. 99C4599)

Job Responsibilities:

• Handle full set of accounts & accounting functions to ensure accuracy & compliance with current accounting practices & principles

• Responsible for daily accounting operations, cost accounting, audit, cost control, inventory control and asset management

• Ensure updating of all book-keeping transactions with speed and accuracy

• Responsible for cost centre accounting such as cost allocation analysis

• Establish and manage the rate chart and chargeback model for recovering costs through internal company

• Assist manager in preparing financials and to ensure timely submission of monthly accounts and management reports

• Provide financial accounting support and analysis to business units/commercial team

• Monitor sales and accounting of all money collections

• Intercompany reconciliation with counterparts by investigating and resolving differences

• Assist to formulate and review the group operating policies with the ultimate objective of improving the internal control system and practices and standardization of operating procedures for greater transparency, efficiency and resource utilization

• Ensure transactions are recorded in a tax efficient and effective manner

• Compliance with all business and financial controls required to minimize operational and financial risks

• Establish, maintain, and coordinate the implementation of accounting control procedures

• Performing & implementation of SOX relevant controls

• Strong understanding of IFRS, SFRS and US GAAP (advantage)

• Ability to perform consolidation is advantageous

• To perform any ad-hoc reports and jobs as and when requested by the supervisor
  

HOW TO APPLY:

Interested applicants, kindly send your resume in MS WORD format or please click on “Apply Now”.

We regret only shortlisted candidates will be notified.

Important Note: Trust Recruit Pte Ltd is committed to safeguarding your personal data in accordance with the Personal Data Protection Act (PDPA).

Please read our privacy statement on our corporate website www.trustrecruit.com.sg.

Trust Recruit Pte Ltd      

EA License No: 19C9950

EA Personnel: Lee Jun Siong (Johnson)

EA Personnel Reg No: R24120242

The Job:

• Handle Accounts Payable (AP), including invoice processing, verification, posting, and vendor reconciliation
• Manage Accounts Receivable (AR) activities, including billing, collections coordination, and customer account reconciliations

The Requirements:

• LCCI/ Diploma Holder in Accounting

Interested applicants can send their detailed resumes to janelui@recruitexpress.com.sg or call JANE @ 6735 1955.

JANE LUI JIE'EN

CEI: R1104482
Company Reg.No. 199601303W || EA Licence No. 99C4599

The Graduate Industry Traineeships (GRIT) Programme is an initiative by Workforce Singapore (WSG) that offers fresh graduates with traineeship opportunities for a period of 6 months across various sectors. 

The programme aims to support fresh graduates, with no prior working experience, from Universities, Polytechnics, Institutes of Technical Education (ITE) and other Educational Institutions (e.g. private universities and overseas institutions), amid uncertainties in the economy. It supports structured traineeships for trainees to gain hands-on industry-relevant experience and skills, preparing them for successful transition into full-time employment.

All trainees must fulfil the following criteria:  

• Graduated in 2024, 2025 or 2026 from Universities, Polytechnics, Institutes of Technical Education (ITE), or other Educational Institutions (e.g. private universities and overseas institutions); or
• Graduated earlier from above institutions and completed National Service in 2024, 2025 or 2026
• Applicants must have no prior working experience and must be prepared to commit to a full-time traineeship

MAIN PURPOSE

To support the Key Accounts – Mecca and Sephora Business and assist in collecting, managing and analysis of large data sets – for business decisions and analysis of reports.

KEY RESPONSIBILITIES

RESPONSIBILITIES 1

• Assist in preparing Monthly Sales Reports, providing insights, trends and metrics

RESPONSIBILITIES 2

• Assist in creating and running excel reports

• Oversee data accuracy and refinement of dashboards

RESPONSIBILITIES 3

• Data analysis for business decisions and analysis of reports for key stakeholders

• Support preparation of the data for managers to review monthly estimates to ensure timely and accurate reporting

REQUIREMENTS

• Currently pursuing a Bachelor's degree or higher in Analytics, Mathematics, Statistics, or other related field

• Proficient in Microsoft Excel

• Ability to analyse data and derive key insights (e.g., business implications) that guide key

business decisions

• Ability to pay attention to details and manage tasks effectively

• Ability to bring onboard new perspectives and ways to carry out tasks and solve problems

• Strong and demonstrated written and verbal communications skills.

• Ability to work in a fast pace and team environment

Company Overview

Established in 2003, Skyy Design Workshop delivers distinctive event and interior design services with strong in-house production and skilled teams. We provide full-scale event logistics, interior architecture, and production solutions for corporate and commercial clients.

Job Summary

You will support accounting and HR functions by maintaining accurate records, assisting recruitment and onboarding, managing office supplies, and providing administrative support to ensure smooth daily operations.

Responsibilities

• Report directly to the Senior Accountant and HR Specialist to complete assigned tasks accurately and timely
• Digitally store and update bookkeeping data annually to maintain organized financial records
• Reorganize and consolidate employee bio files by merging duplicates into a single, accessible location
• Maintain accurate HR system records (Info-Tech) for payroll, leave, claims, and attendance to support payroll processing
• Support recruitment by posting job openings, scheduling interviews, and coordinating with Hiring Managers and Senior HR staff
• Prepare official HR documents such as appointment, employment, and increment letters with attention to detail
• Facilitate onboarding and offboarding by updating HR systems, managing internal Excel files, issuing equipment, and arranging seating
• Provide administrative support to the Accountant for accounts-related tasks to ensure smooth financial operations
• Manage procurement of office supplies including uniforms, stationery, and consumables to maintain office readiness
• Manage and maintain the company mailbox to ensure timely handling of correspondence
• Answer incoming phone calls and transfer them to the appropriate departments promptly
• Assist with general accounting and HR administrative duties and perform ad hoc tasks as assigned
• Uphold employee confidentiality and adhere to the Non-disclosure Agreement to protect company information

Key Responsibilities

Payment Processing& Invoice Verification

• Process a high volume of payments with proper supporting documents and approvals.
• Verify invoices, bills, and transaction documents for accuracy and completeness.
• Maintain vendor records and ensure payment details are accurately updated in the system.
• Perform bank reconciliations, balance sheet reconciliations, and month-end closing activities.
• Assist in GST/VAT filings and liaise with external tax agents and auditors where required.

Bookkeeping &Daily Accounting Records

• Perform daily bookkeeping entries and ensure timely recording of financial transactions.
• Maintain up-to-date internal accounting records for all entities.
• Ensure proper filing and documentation of all accounting entries.

Reconciliation& Support

• Collaborate closely with the Settlement Team to retrieve, verify, and reconcile transaction data for accurate bookkeeping and monthly management reporting.
• Assist in basic account reconciliations and matching of transaction records.
• Identify and highlight discrepancies for review by senior team members.
• Support month-end closing preparation and data collection.

Team Support

• Work closely with Senior Accountant and Manager to support finance operations and reporting.
• Assist in organizing financial data for audit and compliance purposes.
• Perform ad-hoc finance and administrative support tasks as required.

Requirements

• Diploma or Degree in Accounting / Finance or related field.
• Min 3 years of relevant experience. Prior experience in an accounting firm or professional services environment is highly preferred.
• Detail-oriented and willing to learn.
• Proficient in Microsoft Excel and accounting systems Xero.
• Proficient in both English and Chinese (written and spoken),with strong communication skills and the ability to collaborate effectively with Chinese speaking internal and external stakeholders across functions.
• Strong team player with a proactive attitude and willingness to support cross-functional teams.

Key Responsibilities

Administrative  & HR Duties

1. Handle general office administration and coordination
2. Maintain proper filing and documentation of company records
3. Prepare letters, reports and administrative documents
4. Assist with work pass applications, renewals, and related matters
5. Maintain and update employee records and HR documentation
6. Ensure office supplies and operational needs are properly managed
7. Renewal of Insurance such as Fee Protection Scheme and Medical
8. Support other general administrative and HR-related tasks as assigned

Accounts Duties

1. Prepare students contract, collection and refund
2. Perform data entry and maintain accurate accounting records
3. Assist in preparing monthly financial reports and supporting documents
4. Coordinate with external parties when required
5. Perform other accounting-related duties as assigned

Requirement

1. Diploma or equivalent qualification in Business, Accounting, or related field
2. Relevant working experience preferred
3. Proficient in Microsoft Office applications
4. Familiarity with Xero Accounting Software
5. Familiarity with SmartHRMS