Total 320 purchasing manager job vacancies in kuala lumpur

工作職責：

• 透過推銷電話與企業客戶建立關係。
• 透過電話、電子郵件和視訊通話推廣公司服務和產品。
• 創造性地自行產生潛在客戶並確定潛在客戶資格。
• 透過現有客戶尋求新的銷售。
• 努力工作，完成個人銷售目標。

工作要求：

• 強大的電話服務能力和每天撥打數十通電話的經驗
• 積極主動、熱情的學習者和協作團隊成員。

附加優勢：

• 在企業銷售和大客戶經理方面擁有豐富的經驗和成就

津貼和福利

• 津貼（旅費、交通費等）
• 附近的公共交通
• 中心位置
• 彈性的工作時間
• 休閒著裝要求
• 定期團隊活動
• 公司旅行
• 醫療保險
• 事假
• 開放文化
• 個人發展機會

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Product Manager】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Act as the payment expert/consultant for the product internally and externally, and as the primary contact for queries related to the product
• Collaborate with different teams and stakeholders, project-manage the integration of payment channels onto the Alipay platform and overseas E2E development process from evaluating contracts to go-live
• Understand, define and track product performance metrics and continuously enhance customer experience and performance
• Translate business requirements into product requirement/ user stories
• Ensure the development team understands the context and specifications to deliver a quality product within the timeline
• Understand user mindset and behaviour through research, observation, data-mining, and E2E testing

Qualifications

• 1 years+ experience in payment product management or related role
• Good understanding of e-commerce, payment technology, payment channels, and industry players in Southeast Asia markets
• Hands-on experience working with both business and technical teams, preferably integrating payment channels or payment services
• Experience in understanding business requirements and defining product specifications
• Strong analytical skills and proven ability with data-driven decision-making, being able to define and manage qualitative and quantitative research and measurement plans
• Strong organizational acumen – ability to thrive in a matrix environment where success depends on a high degree of cross-functional collaboration
• Proficient in English and Mandarin to communicate with our Mandarin-speaking stakeholders

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Compliance Product Manager】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Develop and deploy Regulatory Technology (Reg-Tech) products that align with international regulations and local licensing requirements, encompassing legislation interpretation, regulatory disclosure, compliance management, and risk identification etc.
• Prepare PRD and DEMO designs, drive the implementation progress of the product, collaborate with business partners and IT engineers, and ensure achievement of compliance requirements and business targets.
• Focus on product development and industry trends in the Reg-Tech field, and integrate technologies such as artificial intelligence, big data, and privacy computing for continuous innovation and product upgrades.

Qualifications

• Bachelor degree or above, 3 years working experience or more; Fine global views, clear and agile thinking logic, strong communication and coordination ability, and strong decision making ability.
• Experience in the design of regulatory compliance \ privacy protection \ risk control \ data center products of large financial institutions, especially payment or banking company.
• Fluent in English, and able to use it as work language.
• Have entrepreneurial spirit, permanent passion and responsibility under uncertainties and changes environment.

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

HR Reporting and Administration

• To establish the Human Resources Manual, Guidelines and Policies while, working professionally, in full co-operation, harmony, discipline, efficiently, competently, conscientiously, honestly and reliably to carry out the functions of the Human Resources Department and also to provide guidance and training towards staff advancement and excellence whilst ensuring strict confidentiality in all personnel matters.
• Ensure job cards, payroll, and all relevant records for Menta Construction Sdn Bhd (MCSB) and related companies including the paying of taxes, employee’s provident fund and statutory insurance together with all the periodic statutory reports are undertaken completed and filed properly.
• Identify and implement all legal and government requirements affecting human resources.

TRAINING AND SKILL DEVELOPMENT

• Plan and conduct new employee orientation to foster positive attitude, ensuring development and improvement of employees’ work skill through providing training sessions relevant to the organizational and functional needs.
• Ensure all personnel receive basic instruction in the Companies policies, procedures and practices to ensure they are familiar with the Companies’ operation incorporating training programs relating to the Companies’ Quality Management System.
• Identify staff training needs, propose annual training plan and budget and conduct post training assessment to ensure effective transfer of knowledge is achieved.
• Ensuring all relevant staff is in possession of valid green cards and to promptly organize the necessary training for those in need of green cards.

RECRUITMENT AND SELECTION

• Establish a proper personnel recruitment system incorporating from reviewing the needs of the company, advertising, arranging the interviews, testing and selecting the right candidates and issuing the appointment letters to the successful candidates and thereafter maintain an up to date data of every employee.
• Handle all matters pertaining to foreign workers including the issuance of I-cards, whilst complying with all legal and statutory regulations and requirements. This includes the safe custody of the passports. 

Compensation and benefits

• Maintain a proper leave (annual, medical, emergency and unrecorded) record of all the staff including the medical expenses incurred.
• Ensure all staff are insured as per the practice of the company. 

 Employee Relations

• Handling all disciplinary matters, conduct domestic inquiries and if necessary termination of staff as per the labour practice in the country.

Performance Management

• To draw up and update the job description of every designated portfolio and department within the Company.
• Establish and administer an effective performance appraisal system to ensure staff performance is effectively captured for the benefit of the company and the staff concerned.

Core Competencies

• Good planning, organisational, analytical and decision-making skills.
• Confidentiality, tact and discretion when dealing with people.
• Ability to train and use initiative.
• Professional approach with excellent administration skills
• Knowledge of employment act in Malaysia. 

General Competencies

• Excellent oral, written communication and organisational skills.
• Self-driven and good communicator.
• Good interpersonal skills and positive outlook on life.
• Assertive nature.
• Logical thinker with high levels of initiative.
• Work independently, with a high degree of responsibility. Work well under pressure and to deadlines

Perks & Benefits

• Nearby public transport
• Medical insurance
• Personal development opportunities

Job Summary:

We are seeking a highly motivated and experience F&B Assistant Unit Manager in ensuring the smooth and efficient operation of the non-halal Chinese buffet establishment for a multinational corporation. This role plays a pivotal role in supervising the waitstaff, managing service flow, and maintaining high service standards to ensure an exceptional dining experience for our patrons.

Responsibilities: 

• Proficient in reception service and provide exceptional customers services at the reception. 
• Responsible to manage and supervise the front-of-house daily operations of the non-halal Chinese restaurant.  
• Responsible for handling the VIP reservations and fine-dining service 
• Responsible for the VIP room cleanliness and tidiness, ensuring its readiness at all times. 
• Responsible to ensure the compliance of food safety and work safety of the operations 
• Provide training and retraining to new staff and all team members. 
• Provide toolbox talks daily. 
• Supervise the preventive maintenance service and repair for the facility and kitchen equipment  
• Responsible for the required inventory reports and other business reports. 
• Responsible for ensuring the compliance with all regulatory compliance within area of responsibility and reporting potential issues to management. 
• Maintains strict confidentiality in all departmental and company matters. 
• Responsible for the festive decorations and other events 
• Support the Unit Manager whenever necessary. 
• Any other jobs as required 

Qualifications and Requirements：

• Diploma or Bachelor's degree in Hospitality Management or related field (preferred).
• Proficient in written and spoken Chinese language
• Prior experience in a similar role is preferred
• Ability to work in a fast-paced environment, multitask, and prioritize effectively.

Perks & Benefits

• Commission and bonus
• Nearby public transport

Purpose of the Job/Job Mission

Responsible for actively identifying, creating, and expanding business opportunities for the company’s products within targeted markets. Develop an in-depth understanding of customer needs and offer solutions, alternatives, and improvements to provide value for customers. Thorough knowledge of customers, markets, capabilities, and suppliers. Be an expert in the territory so that the business is positioned for future growth. Work closely with all facets of the organization, communicating key information and business trends as well as be an integral part of customer supply chain decisions. Effectively manage the territory and consistently provide superior customer service. He/She should develop a network of contacts to attract new clients, research market opportunities and oversee growth projects, making sales projections and forecasting revenue in his/her territory, in line with projected company goals. 

Responsibilities and Accountabilities 

• Product Knowledge: Develop a deep understanding of the technical specifications, manufacturing processes, applications and mechanical strengths of GRP pipes and the Company’s other products and their comparison to competing materials and brands. Stay updated on industry standards and advancements in GRP technology.
• Client Acquisition: Identify and target potential clients in industries such as water and wastewater, oil and gas, chemical processing, and infrastructure development to generate new business opportunities.
• Consultative Selling: Engage with clients to understand their project requirements and recommend suitable GRP pipe or other company solutions. Provide technical expertise and support throughout the sales process.
• Proposal Development: Prepare detailed and customized proposals, including technical specifications, pricing, and delivery schedules. Collaborate with internal technical teams to ensure alignment with client needs.
• Relationship Building: Build and nurture strong relationships with key decision-makers, engineers, and project managers in client organizations and within engineering consulting companies. Position the company as a trusted partner for GRP pipe solutions.
• Market Analysis: Conduct market research to identify industry trends, competitor strategies, and potential areas for growth. Provide insights to support strategic decision-making and marketing initiatives.
• Marketing support: Support marketing activities by attending trade shows, conferences and other marketing events.
• Training and Education: Organize and help conduct product training sessions for clients, distributors, and internal sales teams. Stay informed about the latest developments in GRP pipe technology and share knowledge with relevant stakeholders.
• Sales Presentations: Develop and deliver compelling sales presentations that highlight the benefits and advantages of GRP pipes in various applications. Address technical inquiries and concerns effectively.
• Sales Reporting: Maintain accurate records of sales activities, customer interactions, and project status. Generate reports to track sales performance and contribute to the continuous improvement of sales strategies.
• Customer Support: Provide post-sales support, including technical assistance, troubleshooting, and coordination with internal teams for successful project implementation. Ensure high levels of customer satisfaction.

Perks & Benefits

• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Casual dress code
• Free snacks / Happy hours
• Regular team activities
• Medical insurance
• Personal leave
• Personal development opportunities

工作總結：

我們正在尋找一位積極主動且經驗豐富的餐飲部門助理經理，以確保一家跨國公司的非清真中式自助餐餐廳順利高效地運作。該職位在監督服務員、管理服務流程和維持高服務標準方面發揮關鍵作用，以確保為顧客提供卓越的用餐體驗。

職責：

• 精通接待服務，並在接待處提供卓越的客戶服務。
• 負責管理和監督非清真中餐廳的前台日常運作。
• 負責辦理VIP預訂及精緻餐飲服務
• 負責貴賓室的清潔和整潔，確保其隨時準備就緒。
• 負責確保食品安全和作業安全的合規性
• 為新員工和所有團隊成員提供培訓和再培訓。
• 每天提供工具箱講座。
• 監督設施和廚房設備的預防性維護服務和維修
• 負責所需的庫存報告和其他業務報告。
• 負責確保遵守職責範圍內的所有法規，並向管理層報告潛在問題。
• 對所有部門和公司事務嚴格保密。
• 負責節日裝飾和其他活動
• 必要時支援單位經理。
• 任何其他需要的工作

資格及要求：

• 酒店管理或相關領域的文憑或學士學位（首選）。
• 精通漢語書面和口語
• 有類似職位經驗者優先
• 能夠在快節奏的環境中工作、處理多項任務並有效地確定優先順序。

津貼和福利

• 佣金和獎金
• 附近的公共交通

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Product Manager, Payment】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Conduct market research and client interviews to understand client needs and market practice
• Defining product requirements based on client needs and business objectives
• Provide cross-border payment solutions for Ant's global users and acquirers
• Responsible for the implementation of the product capabilities of acquiring payment products 
Drive product innovation and differentiation
• Collaborate closely with internal teams including engineering, marketing, business, and others to deliver high-quality products on time

Qualifications

• Bachelor’s degree in engineering, computer science or related technical field
• More than 3 years of work experience in product development, preferably from the payment industry
• Self-motivated, proactive, and able to work with minimal supervision
• Proficient in English and Mandarin to communicate with our Mandarin-speaking stakeholders

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Payment Technology Product Manager】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Responsible for digital wallets products, and conduct market research, client requirement analysis, and build up new products.
• Responsible for the delivery of digital wallet projects, and clarify the product implementation plans and promote its deployment by considering resources, factors and other factors.
• Responsible for on-time launch at the delivery phase, and fast respond to clients at the post-sale phase.

Qualifications

• With at least 3-year product design working experience, and the related experience on digital wallets or payments is preferred.
• Fluent in English, and the strong international and industry working experience is preferred.
• With strong sense of product ownership, cross-functional working capabilities, and decent capabilities on coping with pressure.

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Solution Product Manager, Payments Collection】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Understand in details Ant's product&product operation capability related to payment processing(acquiring) from credit cards, E-wallets and other APMs under Ant's various global entities including U.S, Latam and various Asian countries.
• Work closely with business development team to create and present Ant's global payment products solution to both prospective and existing merchants, with a focus on selling new solutions Vs. supporting existing solutions.
• Effectively capture and articulate the merchants business needs, identify the potential gaps and translate them into product requirements.
• Lead the product solution development efforts to fill the gap or fulfill customized requirements with a focus heavily on meeting individual merchant's needs based on existing product capabilities, less of developing whole new product capabilities.
• Regularly collect product requests from other internal functions such as compliance, operations that will have impact on the implementation of the product solutions to particular merchants.
• Act as an ambassador for the product internally and externally, and as the primary product contact for queries related to the product.
• Manage external and internal stakeholder relationship in any product related engagement.
• Understand, define and track product performance metric. Continue provide feedback to improve customer experience and performance.

Qualifications

• At least 3+ years experience in a product management or related role. Previous experience in payments industry is highly preferred.
• Good understanding on payment technology, payment channels and industry players.
• Hands-on experience working with both business and technical teams. Experience in understanding business requirement and defining product specifications.
• Strong analytical skills and proven ability of data-driven decision-making, ability to define and manage qualitative and quantitative research and measurement plans.
• Strong organisational acumen – ability to thrive in a matrix environment where success depends on a high degree of cross-functional collaboration.
• Can-do attitude, willingness to learn and listen, ability to work independently, and strong drive to get things done. Frequent travel is required.
• Ability to effectively communicate with internal and external customers.

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

Headquartered in Singapore, Ant International powers the future of global commerce with digital innovation for everyone and every business to thrive. In close collaboration with partners, we support merchants of all sizes worldwide to realize their growth aspirations through a comprehensive range of tech-driven digital payment and financial services solutions.

We are seeking for a【Product Manager-FX】based in Kuala Lumpur, Malaysia.

Key Responsibilities

• Participate in foreign exchange market research, identify market trends, benchmark competitors, and be responsible for the planning and iteration of industry product matrix.
• Responsible for requirement analysis, feasibility analysis, and design of foreign exchange, payment, collection, liquidity management products, and prepare product requirement documents (PRD).
• Collaborate with technology teams and project managers to follow up on requirement implementation, track product development progress until product launch and operation, and take responsibility for progress and quality.
• Responsible for daily business data analysis and product improvement and optimization based on business development and usage.

Qualifications

• Bachelor's degree or above, with a minimum of 3 years of work experience (preferably in product management for large international bank foreign exchange, payment, collection, liquidity management systems or large bank foreign exchange, payment, collection, liquidity management system suppliers).
• Familiar with the product design and implementation process, including market analysis, requirement analysis, product feature design, business process design, interface design, user research, and usability testing.
• Strong logical thinking ability and communication and coordination skills, proficient in cross-functional and cross-regional communication, and have a global perspective on product sensitivity to data.
• Good sense of teamwork and strong ability to handle pressure. Responsible and highly aware of ownership.
• Familiarity with global foreign exchange, payment, collection, liquidity management related business.
• Preferred knowledge of business or system architecture capabilities and fundamentals.
• Proficient in spoken and written English communication, as well as cross-regional and cross-cultural communication experience.

Perks & Benefits

• Employee equity
• Commission and bonus
• Allowance (travel stipends, transportation, etc.)
• Nearby public transport
• Central location
• Flexible working hours
• Casual dress code
• Regular team activities
• Company trips
• Medical insurance
• Personal leave
• Sabbatical leave
• Open culture
• Personal development opportunities

職位描述

· 領導並招募電話行銷人員團隊，提供指導、輔導和指導。

· 設定績效目標，定期進行績效審查，並根據需求制定改善計畫。

· 規劃和執行電話行銷活動以產生潛在客戶並推廣產品或服務。

· 建立並維護客戶關係，確保客戶滿意度

· 產生並分析有關電話行銷績效、轉換率和潛在客戶開發有效性的報告。

工作要求

· 候選人必須至少擁有SPM或同等學歷

· 擁有豐富的電話行銷經驗，至少擁有 3 年電話行銷經驗和 1 年管理或監督經驗。

· 能夠讀寫國語和英語

· 優秀的溝通與談判能力

· 較強的領導能力和團隊管理能力，具有激勵和激勵團隊的能力。

· 能夠每週工作 6 天

為什麼加入我們？

• 地點：吉隆坡生態城（靠近LRT/KTM）
• 有競爭力的佣金結構
• 可以在家工作
• 辦公室免費提供咖啡、茶和小吃
• 年假12天，病假14天，住院假60天，其他包括產假，陪產假
• 醫療索賠和保險
• 正向年輕的文化
• EPF、SOCSO、EIS
• 每年增加您的基本工資並改善您的生活方式
• 年度獎金
• 激勵/獎勵
• 每月活動

津貼和福利

• 佣金和獎金
• 附近的公共交通
• 中心位置
• 免費小吃/歡樂時光
• 開放文化
• 個人發展機會

Title:  Contract  Manager ( Construction )

Location: Plaza OSK, Jalan Ampang KL

Salary range : RM 6,800 – RM8,500

 
Experience & Qualification:

Bachelor’s Degree / Diploma / Quantity Surveyor / Civil Engineering / Contract Management or equivalent
At least minimum 5 years working experience with developer  companies
Strong knowledge of pre and post contract works especially variety form of contracts, cost control budget and contractual issues
Possess excellent negotiation, interpersonal and communication skills
Knowledge in Microsoft office, excel and words
Working language Mandarin, English and Malay with suppliers and HQ colleagues 
 

Job Description:

Responsible for end to end spectrum of Contract Management.
To implement all policies, activities, procedures as relevant and required by the company.
Responsible for drafting and review contractual documents and dealing with contractual disputes and/or issues.
Pre-qualification of tenders, evaluate and recommend to Management.
Liaison with consultants for the whole process of tendering exercise involving of strategizing the tender packages, evaluating the suitable of a particular Form of Contract and specific conditions of tendering.
Review tender and contract documents prepared by the consultants.
In charge of tendering exercise especially tender, including calling of tender, review tender reports, attend tender interviews, negotiate, finalize, and prepare recommendation report to Management for award of contracts.
Liaison with the consultant QS to provide monthly project financial statement for reporting purpose.
Prepare analysis and comparison on alternative proposal.
To monitor timely process by the consultants for variation works submitted by the contractors.
Review the Statement of Final Accounts prepared by the consultants.
Other relevant tasks which assigned by Immediate Superior
 

Working Day/Hour:

6 working days  (Rest on Sunday)

8.00am – 6.00pm (1 hour break)

Perks & Benefits

• Allowance (travel stipends, transportation, etc.)
• Personal development opportunities

Job Responsibilities

• To develop new business opportunities.
• To sell company's Financial products & 3rd party products & services.
• Build and maintain close business relationship with the High Net Worth (HW) customers in providing value added investment.
• Involve and implement operational & marketinq activities of Premier Wealth Centre.
• Handle all credit applications as well as the operational transactions within the permitted authoritv limit.
• Be guided by Certified Financial Planner (CFP) rules and regulations in providing investment advisory to affluent customers.

Job Skills

• Obtained-licenses-:-FIMM,-IPPC,-PCE,-CEILI,-TBE

Job Requirements 

• Minimum 2 years of experience in the sales related field is required for this position.
• Broad knowledge of Company Group's products.
• Possess good interpersonal and relationship building skills with strong self-assured and confident.
• Able to think creatively, results oriented and high performance driven. 
• Able to work under pressure and meeting tight deadlines, independent and a good team player.
• Excellent interpersonal skills. - Must fully understand the product features and HNW individual life style needs.
• Must have strong balance of relationship management, customer and result orientation. 

-Bank standard employee benefits 

職位：合約經理（建築）

地點：Plaza OSK, Jalan Ampang KL

薪資範圍：RM 6,800 – RM8,500

經驗及資格：

學士學位/文憑/工料測量師/土木工程/合約管理或同等學歷
至少 5 年開發商公司工作經驗
對合約前期和後期工作有豐富的了解，特別是各種合約形式、成本控制預算和合約問題
擁有出色的談判、人際交往和溝通技巧
Microsoft Office、Excel 和 Word 知識
與供應商和總部同事的工作語言為普通話、英語和馬來語

職位描述：

負責端到端的合約管理。
執行公司相關和要求的所有政策、活動、程序。
負責起草和審查合約文件並處理合約爭議和/或問題。
投標資格預審、評估並向管理層推薦。
在整個招標過程中與顧問聯絡，包括制定招標方案、評估特定合約形式的適用性和具體招標條件。
審查顧問準備的招標和合約文件。
負責招標工作，特別是招標，包括招標、審查招標報告、參加投標面試、談判、敲定並向管理層準備推薦報告以授予合約。
與顧問 QS 聯絡，提供每月專案財務報表以供報告之用。
準備對替代方案的分析和比較。
監督顧問及時處理承包商提交的變更工程。
審查顧問準備的最終帳目表。
直屬上級交辦的其他相關工作

工作日/小時：

6個工作天（週日公休）

上午 8 點至下午 6 點（休息 1 小時）

津貼和福利

• 津貼（旅費、交通費等）
• 個人發展機會