Total 14 job vacancies by Hays Specialist Recruitment

Your new role
In your new role as a Senior Accounts Receivable, you will manage the daily activities of the team. You will also manage collections and following up of outstanding payments of key accounts, ensuring the timely resolution of any outstanding balances. You will be responsible for motivating and supporting the team to encourage success and positivity. There also could be opportunities to deputise for the AP/AR Manager when required.

Key Responsibilities:

• You will have ownership and maintenance of a variety of key account customers
• Produce and maintain reconciliations of key accounts
• You will support the AP/AR Manager with on-boarding of new customers.
• Conduct a weekly review and escalation of all aged debt problems to AP/AR Manager
• Weekly debt reviews
• You will be responsible for continuously reviewing credit limits.
• Support the AP/AR Manager in underwriting to minimise bad debts
• Own, review and circulate problem account daily
• Produce the orders on hold report daily
• Support and motivate the team
• Contribute the essential information to adhere to the strategic goals of the company
• Ad Hoc duties as and when required

What you'll need to succeed

• Previous experience in a senior position, where you have experience of leading and motivating a team
• Experience of and are competent at completing account reconciliations on Excel
• Good understanding of an AR function
• Self-starter, motivated with an ability to multi task

What you'll get in return

• c.£30,000 DOE
• On-site parking
• Potential of hybrid working after probationary period
• Generous holiday allowance
• Excellent benefits package
• Full-time working week Monday-Friday

What you need to do now


If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Senior Administrator

Stoke - On - Trent
£25,000 - £30,000
Mon-Fri 9-5

Principal Duties:

• Maintain customer databases and respond to internal and external queries via phone and online.
• Support vehicle ordering for customers using the internal fleet management system.
• Ensure all orders comply with policies and procedures, providing accurate information to customers and operatives.
• Complete all relevant paperwork to a high standard.
• Report, investigate, and chase delivery issues and returns.
• Chase and process Proof of Deliveries confirmations.
• Check store invoices.
• Generate and prepare reports.
• Perform ad-hoc tasks as advised by the manager.
• Process, log, and track orders.
• Manage stock control.
• Ensure compliance with Health and Safety regulations.
• Liaise with transport companies, suppliers, and clients.
• Facilitate communication within all departments.
• Prepare documents such as invoices, purchase orders, and billing.
• Conduct manual stock and date checks of inventory.
• Prepare monthly consumable reports.
• Handle parking fine appeals.
• Update fleet lists.
• Complete driver licence checks and communicate results to relevant departments.
• Update the machinery/asset database on both Excel and Pat Guard.
• Act as a central conduit for information.
• Pack and gather interim orders for area managers.
• Answer emails promptly and professionally.

Essential:

• Proficiency in Microsoft Word, Excel, and PowerPoint.
• Professional telephone manner.
• Effective time management.
• Excellent written and oral communication skills.

Desirable:

• Previous experience in an office environment.
• Familiarity with basic office procedures.

Job Types:
Full-time, PermanentBenefits:

• Company pension
• Free parking
• On-site parking

Schedule:

• Monday to Friday

Work Location:Office

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
We are recruiting on behalf of a well-established firm of mechanical and electrical consulting engineers. This organisation has a strong reputation for innovative engineering design, dynamic project management, and stringent quality control. Their expertise spans a wide range of sectors, including commercial, education, healthcare, historic buildings, and residential projects. They are committed to delivering high-quality, energy-efficient solutions and maintaining the integrity of historic structures while implementing modern mechanical and electrical systems.
Your new role
We are seeking a Senior Mechanical Design Engineer to join the team. In this role, you will be responsible for leading the design and management of mechanical services for a variety of building projects. You will work closely with clients, architects, and other stakeholders to deliver high-quality, sustainable designs that meet project requirements and industry standards.Key Responsibilities:

• Lead the design and development of mechanical systems for various building projects, ensuring compliance with relevant standards and regulations.
• Prepare detailed design drawings, specifications, and reports using AutoCAD, Revit, and other design tools.
• Conduct site surveys and assessments to inform design decisions.
• Manage project timelines, budgets, and resources to ensure successful project delivery.
• Provide technical guidance and mentorship to junior engineers and design staff.
• Collaborate with clients, architects, and other stakeholders to understand project requirements and deliver tailored solutions.
• Ensure all designs are energy-efficient and sustainable, incorporating the latest technologies and best practices.
• Conduct feasibility studies, prepare budget estimates, and manage financial aspects of projects.
• Maintain up-to-date knowledge of industry trends, standards, and regulations.

What you'll need to succeed
We are looking for a highly skilled and experienced mechanical design engineer with a passion for delivering high-quality, sustainable solutions. Ideally, you will have:

• A degree in Mechanical Engineering or a related field.
• Extensive experience in mechanical design engineering, preferably within the building services sector.
• Proficiency in using design software such as AutoCAD, Revit, and CYMAP.
• Strong project management skills, with a proven track record of delivering complex projects on time and within budget.
• Excellent communication and interpersonal skills, with the ability to collaborate effectively with clients, architects, and other stakeholders.
• A thorough understanding of relevant standards, regulations, and best practices in mechanical engineering.
• Experience in sustainable design and energy-efficient systems, including knowledge of BREEAM and other environmental assessment methods.
• Strong problem-solving skills and the ability to make informed decisions under pressure.

What you'll get in return
The organisation offers a competitive salary ranging from £40,000 to £64,000, with the possibility of including a car in the overall package. Additional benefits include:

• Opportunities for continuous professional development and career progression.
• A supportive and collaborative working environment.
• Exposure to a wide range of projects and sectors.
• Flexible working arrangements to support work-life balance.
• Comprehensive benefits package, including health insurance and pension contributions.

What you need to do now


If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Well-established independent accountancy firm in South Staffordshire seeking to further grow their team at Semi-Senior level.

Your new role
Working with a diverse mix of clients, you will prepare financial statements, tax returns (personal and corporate) along with management accounts and VAT returns. You will liaise regularly with your clients, which will include sole traders, limited companies and partnerships. Opportunities to get involved in audit work will be available, but the key focus of the role will be on accounts preparation.

What you'll need to succeed
My clients are seeking an individual with solid experience gained in preparing accounts within a UK accountancy practice for 2 years or more. Additionally, you will possess AAT qualifications - preferably with Level 4 completed or close to completion, however those progressing with ACCA/ ACA would also be considered.
Alongside the experience and qualifications mentioned, you will be able to manage your time and your work effectively to deadlines, will be an excellent communicator, able to build rapport with clients and colleagues and will be a good team player.

What you'll get in return
This is an excellent opportunity to join a supportive and friendly firm who are keen to further grow their team due to ongoing client success. On offer: support towards study (where required), on-site parking, flexible working, approachable managers and a varied role. Whilst the firm are ideally seeking to hire a full-time member of the team, individuals seeking a part-time working pattern may also be considered for this role.

What you need to do now

If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Job title: Senior PPC Specialist

Hybrid: 3 days in office, 2 from home

Salary: £45,000 - £50,000

Location: Staffordshire

The Opportunity

We are looking for a seasoned PPC Search Specialist with a proven track record in managing high-budget paid search campaigns on Google and Bing. The perfect candidate will possess significant experience in both lead generation and e-commerce, and be adept at handling large, unstructured data feeds. This role is crucial for enhancing global campaign performance and involves close collaboration with various teams to ensure cohesive marketing efforts.

Key Responsibilities:

• Manage a monthly six-figure PPC budget, ensuring efficient expenditure while achieving key metrics around ROI, ROAS, lead volume, CPL, CPC, and CPA.
• Manage and optimise PPC campaigns across Google and Bing, from initial strategy and planning through to execution and ongoing refinement.
• Oversee the management and optimisation of large-scale, unstructured data feeds to ensure maximum campaign performance.
• Drive performance across both lead-generation websites and e-commerce platforms with targeted approaches tailored to each vertical.
• Develop and implement bidding strategies for campaigns, ad groups, and keywords, maximising performance within allocated budgets.
• Regularly analyse and report on campaign performance using relevant tools.
• Conduct A/B testing and continuously optimise ads, landing pages, and bidding strategies.
• Perform in-depth keyword research and competitor analysis to inform campaign decisions.
• Effectively collaborate with our in-house Technology team to help build and maintain search-related software solutions.
• Work closely with cross-functional teams including creative, technology, supply chain, and sales, to align PPC efforts with broader marketing and business goals.
• Manage global campaigns across multiple languages, ensuring cultural relevance and accuracy in all ad creatives.
• Utilise automation and scripting tools to improve efficiency and campaign results.
• Stay up-to-date with the latest trends and platform updates in PPC, implementing relevant changes to improve performance.

Requirements:

• At least 4 years of hands-on experience managing large PPC budgets across Google Ads and Bing Ads in lead-generation and e-commerce environments.
• Proven experience managing large-scale, unstructured data feeds, with a track record of optimising them for performance.
• Strong understanding of running multi-language campaigns in global markets.
• Excellent analytical skills with the ability to interpret complex data and provide actionable insights.
• Advanced knowledge of tools like Google Analytics, SEMrush, Google Tag Manager, and experience with automation/scripting for campaign management.
• Demonstrated ability to drive results through A/B testing and optimisation.
• Strong problem-solving skills and the ability to thrive in a fast-paced environment.
• Excellent communication skills, both written and verbal, with the ability to present findings clearly to stakeholders.
• A degree in Marketing, Computer Science, Business, or a related field is preferred.
• Google Ads Certification is preferred.

The Benefits:

• You'll be part of a Sunday Times Fast Track 100, Profit Track and HSBC International Track company
• 33 days annual leave per year
• Early Friday finish to kick your weekend off early
• Enhanced maternity and paternity leave
• Employee Assistance Program entitling you to free financial and wellbeing advice, plus up to six free counselling sessions per year
• Health Cash Plan to reclaim the costs of dental, optical, podiatry and other medical appointments
• Life cover
• NEST pension
• Free tea and coffee
• Free parking
• Celebration of seasonal and life events

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Due to my clients' continued expansion and growth, they have an exciting opportunity for an experienced Architect/Architectural Technologist to join their team. My client provides expert witness services and designs and manages construction projects that are tailored to the needs of disabled individuals.
Your new role
In this role, you will be required to:

• Oversee and manage the architectural department.The use of AutoCAD / Caddie software on a daily basis. Producing high-quality drawings and designs.Working across the RIBA stages of work with a focus on the technical stages.Liaising with clients, contractors, consultants, local planning authorities and building control.Work on a variety of projects for disabled clients.Familiar with Technical Building Design and Building Regulations to prepare packages and make submissions.Familiar with preparing specification of works for tender issue. Project running.

What you'll need to succeed
To succeed in this role, it is essential that:

• You are CIAT or RIBA qualified.
• Have experience working in the residential sector.
• You have strong proficiency with AutoCAD.
• Have strong communication and team-working skills.

What you'll get in return

• Competitive salary based on experience.
• Company pension scheme.
• Group life assurance including smart health.
• Mileage allowance.
• 23 days paid annual leave.
• Flexible working arrangements.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Executive Team Assistant
Purpose of role:
To offer a confidential and dedicated secretarial service to the executive team, facilitating their effective role in execution. Additionally, this role encompasses some facilities-related responsibilities.
Location: Stoke, Stoke - On - Trent.
Salary:
£25,000 - £27.5000 DOE
Key Responsibilities:

• Collaborate with the Executive Assistant and executive team members to achieve defined objectives.
• Efficiently manage the executive team's diaries to optimise their time.
• Handle incoming calls related to executive team members promptly and efficiently.
• Manage emails and letters from customers, clients, and internal stakeholders on behalf of the executives. Coordinate with other departments to address queries and complaints effectively.
• Distribute relevant papers for management and meetings as needed.
• Attend weekly Core & Prime Team Meetings, record actions, and create and distribute agendas.
• Ensure progress on meeting actions and compile agendas for upcoming meetings.
• Arrange necessary travel for executive team members.
• Verify that relevant executives have recorded and submitted expenses within required timelines.
• Approve travel expenditures for the rest of the business when necessary.
• Reconcile corporate card expenditures and make necessary purchases on behalf of the business.
• Raise supplier purchase orders, ensuring meticulous record-keeping.
• Maintain an effective and confidential filing system.
• Sort incoming mail, including tracking and scanning checks and legal documents.
• Handle ad-hoc tasks for executive team members, such as project management.
• Occasionally make decisions on behalf of executives, especially related to diary management.
• Request information from internal and external sources.
• Assist in organising catering and hospitality for external visitors, board meetings, and off-site events.
• Provide cover for the Senior Executive Assistant during periods like annual leave.

What You Need to Bring:

• Skills and Attributes:
• Proficient in Microsoft Office applications (Outlook, Word, Excel, PowerPoint).
• Self-motivated, reliable, and adaptable.
• Diplomatic, tactful, and able to adapt to different people.
• Quick thinker, able to work under pressure, and comfortable with minimal supervision.
• Willing to work outside normal hours.
• Energetic, enthusiastic, and thrives in a dynamic environment.
• Desirable Skills:
• Previous secretarial experience.
• Education and Qualifications:
• GCSE in Mathematics and English or equivalent.

If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Successful independent firm with clients ranging in size and industry seeking to recruit a Semi-Senior or Senior Accountant to join the team in a varied practice role.

Your new role
Working with a mixed client portfolio including sole traders, partnerships and limited companies, in this role you will prepare statutory accounts, management accounts and both corporate and self-assessment tax returns using a range of systems including Iris, Xero and Taxcalc. You may also support colleagues with bookkeeping, VAT returns and CIS returns and will liaise regularly with clients.

What you'll need to succeed
To be considered for this role, you will possess prior experience preparing accounts within a UK accountancy firm. My client will consider individuals who have complete or who are part-way through AAT/ACCA or ACA qualifications as well as those who are QBE (provided relevant practice experience can be demonstrated in line with the duties above). Additionally, you must possess excellent communication skills and the ability to work well within a team.

What you'll get in return
You will join a supportive firm who offer flexible working, a positive working environment and a varied practice role. If you are keen to further pursue accountancy studies, support will be offered.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
You will be joining a multi-accredited main contractor based in Stoke who operates across the Midlands. This main contractor works on anything from commercial, educational, retail, healthcare and more. These projects are both new build and refurbishments ranging from £500k - £20m in value. This highly reputable contractor has a large team and due to their continuous growth are looking to onboard a senior estimator who has experience of pricing projects in the region of £10m.
Your new role
* Cost Estimation:* Accurately estimate costs for materials, equipment, utilities, and labour.
* Analyse specifications and research construction documents.
* Project Planning:
* Prepare estimates for project planning, organisation, and scheduling.
* Set work hours, sequence tasks, and obtain materials.
* Resource Management:
* Submit relevant documents and budgets before bid deadlines.
* Stay updated on the latest estimating technology and industry techniques.
* Risk Management:
* Formulate contingency plans and manage risks impacting cost and time estimates.
* Communication and Collaboration:
* Collaborate with other teams, conduct site visits, and provide additional services as needed.
* Regularly report to management and keep clients informed of project status.

What you'll need to succeed
In order to be successful, you will have experience working as a senior estimator (or verging on being a senior estimator) for a main contractor pricing jobs typically between £3m - £10m.
What you'll get in return
In return, you will receive a salary up to £80k (DOE). Flexible working with 2 days wfh and excellent career growth opportunities.
What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Supportive and friendly independent accountancy firm in Staffordshire seeking to recruit an Audit and Accounts Semi-Senior or Senior to join their longstanding team.

Your new role
Working with a varied client base, you will split your time between audit assignments and accounts preparation. Audits will predominantly be with local clients with a few away jobs (3-4) across the year. You will benefit from getting involved in a breadth of work, supporting with audits from planning through to completion and preparing statutory accounts for sole traders, limited companies and partnerships.

What you'll need to succeed
You will possess prior experience of both audit and accounts preparation work within an accountancy practice, will be either AAT qualified or at least part way through ACCA or ACA qualifications and will be keen to develop your career and build lasting client relationships.

What you'll get in return
Within this firm, you will benefit from a good work-life balance, a varied role and a diverse client base. Study towards professional qualifications will be supported and there is real scope for future progression as part of the firms' succession plan.
Both full-time and part-time working patterns will be considered.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Supportive and friendly independent accountancy firm in Staffordshire seeking to recruit an Audit and Accounts Semi-Senior or Senior to join their longstanding team.

Your new role
Working with a varied client base, you will split your time between audit assignments and accounts preparation. Audits will predominantly be with local clients with a few away jobs (3-4) across the year. You will benefit from getting involved in a breadth of work, supporting with audits from planning through to completion and preparing statutory accounts for sole traders, limited companies and partnerships.

What you'll need to succeed
You will possess prior experience of both audit and accounts preparation work within an accountancy practice, will be either AAT qualified or at least part way through ACCA or ACA qualifications and will be keen to develop your career and build lasting client relationships.

What you'll get in return
Within this firm, you will benefit from a good work-life balance, a varied role and a diverse client base. Study towards professional qualifications will be supported and there is real scope for future progression as part of the firms' succession plan.
Both full-time and part-time working patterns will be considered.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Popular, two partner firm with a positive track record of growth.


Your new role
As Accounts & Audit Senior you will be mainly preparing and auditing statutory accounts for limited company clients. Generally supporting the junior staff & Partners.


What you'll need to succeed
Experienced accountant with a positive and helpful attitude.


What you'll get in return
Nice firm, very respected in the local area. Flexible working options available.


What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Are you on the lookout for a new role? I've got an opportunity that could be of interest to you.
Infrastructure Engineer

Stoke on Trent
£300 per day Inside IR35

5 days on site

*BAU role working from ticketing systems
*Infrastructure/Network/Server Issues
*Knowledge of Active Directory Essential

Excellent communication skills, and an ability to work in a team, joining a lovely collaborative team who are very supportive and communicative

3 month initial contract with potential to extend

Interviewing next week!!!If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

This is a superb opportunity to work within the Education sector, with a leading, national multi-academy trust. The trust has numerous sites across the Staffordshire region, with the Head Office/base site being based in the North of Stoke-on-Trent. There is a strong internal network of ICT Technical support staff, led by the Network Manager and ICT/Technology Director. The role is full time and full year. 37 hours per week. (Mon to Fri)
In this role you will support all schools across the Staffordshire region. As part of the ICT/Technology support team, you will predominantly be based at the head office and travel between other school sites to support when required and to deliver upgrades and projects as they arise.
Duties and responsibilities

• Provide onsite support at schools when needed where additional capacity is needed, such as supporting project work and to cover the absence of on-site staff.
• Effective use of the IT Helpdesk to assist end users, prioritise and manage workload, and record activity.
• Update documentation on existing systems or create new documentation as changes are made.
• Support with daily tasks such as checking security logs, reviewing emails held in quarantine, checking backup logs and then taking action where required.
• To work with senior team members to support infrastructure elements such as physical & virtual servers and networking devices, thus ensuring the availability and security of the network, data and applications.
• Contribute to investigation, design, development and implementation of new IT systems under the direction of senior team members.
• To take an active role in the ongoing development and support of the Trust's Office 365 tools such as SharePoint, OneDrive and Microsoft Teams for Education.
• Mentor and support other IT Technicians.

What you'll get in return

• An excellent Local Government Pension Scheme (Support Staff)
• Support Staff only based on working full time, all year - Generous holiday entitlement from your first day of employment (37 days holiday rising to 39 days after 5 years' service including Bank Holidays)
• Access to health and wellbeing support via Occupational Health
• Cycle to work scheme
• Access to fantastic opportunities to help you grow, contribute and flourish in your role and in the Trust.

What you need to do now

• If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.

If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk