Site reliability engineer careers jobs

We have a B2B WordPress website that fails Core Web Vitals on mobile and desktop. The site was originally made by one developer, then worked on by another, resulting in many issues due to lack of communication. The website uses Elementor and a customized theme. We would like to work with an expert WordPress developer to improve the site's performance and get it into the green in Core Web Vitals. We also want to remove all unnecessary plugins (currently the site has almost 50 WordPress plugins). We are open to moving the site to a new server if required and rebuilding it to improve performance. Looking to work with an experienced WP developer and performance expert to solve this. Please get in touch if this is something you specialize in and we can discuss this p...

I'm looking for an experienced developer to create an interface between our laboratory management application and our laboratory automation system, sp...into JSON before it's saved into our management software. A strong understanding of JSON is necessary, as this is the format that the retrieved test results must be saved in. Knowledge of laboratory automation systems, in particular, will be highly advantageous. This task requires attention to detail and an understanding of the sensitivities involved in handling lab data. Confidentiality and reliability are of utmost importance. Please only bid if you have the skills and experience mentioned above. Additionally, please provide a brief summary of your understanding of the project requirements in your bid. Looking forwar...

I'm in need of a professional resume tailored for the technology industry. This resume should be ATS (Applicant Tracking System) friendly and highlight my expertise in DevOps and Site Reliability Engineering. The final resume should be provided in PDF format. Ideal freelancers for this project would have: - Experience in resume writing, specifically for technology jobs - Understand ATS compliance to ensure the resume doesn't get overlooked - Ability to highlight specific skills for DevOps / Site Reliability Engineering - Exceptional writing, formatting, and design skills to make the resume stand out Craft the content carefully, with a full grasp of the technology industry standards and jargon. Your attention to detail will be vastly appreciated. Look...

I need a Mechanical Engineer to design a carbon fibre scooter prototype. This project starts with the ProE proof of concept CAD model, attached. It eventually needs to be progressed to be ready for manufacturing. Ideally, bicycle and scooter design history would benefit. The job will start in about six weeks. The CAD model for prototyping is required by the end of June. Drawings and BOM for costing are necessary. I will cost with your assistance. It will be a collaborative project, with phone and email communications, and include prototype parts. An hourly rate is appropriate. Don’t apply with a structural, civil, graphics, animation or architectural background. It is a light engineering job.

I am seeking an experienced Python developer to improve the functionality of a current script by adding new features, specifically automated tasks. The upgrades will involve: - Analysing and understanding the existing Python script. - Enhancing the script by adding automated task features to streamline operations. - Testing the script to ensure it performs as r...the new features. Ideal applicants will have: - Proficiency in Python, with a focus on script optimization. - Experience integrating automation functionalities into Python scripts. - A keen eye for detail and error detection. - A proven track record improving and maintaining Python script performance. I am looking forward to working with someone who can improve our script's efficiency and reliability through thes...

We are seeking a skilled AI and Machine Learning Engineer and Software Developer to develop and train machine learning models for chatbot functionalities, integrate AI components, and implement NLP techniques. Additionally, I'm looking for a talented Software Developer proficient in Python, Java, JavaScript, and C#, who has experience in chatbot development, both Front-End and Back-End Development, and API Integration. Ideal Skills: - Proficiency in Python, Java, JavaScript, and C# - Experience in Front-End and Back-End Development - Familiarity with Dialogflow and Microsoft Bot Framework - Strong knowledge in AI, Machine Learning, and NLP - Previous experience in chatbot development Roles and Responsibilities: - Develop and train machine learning models for chatbot...

Create Microsoft Planner without SharePoint site or MS Teams

I'm looking for a skilled electrical engineer who can help me with the design of a high-torque electric motor for a cart. Key tasks involved in the project will include: 1. Electrical System Analysis: Understanding the system needs and constraints to design an effective electric motor. 2. Circuit Design: Developing a circuit that will be optimal for the high-torque motor. 3. Troubleshooting and Repair: Providing solutions to potential problems experienced during testing and implementation of the design. The electric motor design needs to account for the following specifications: - Power Rating - Speed - High Torque Engineers with experience in design and development of high-torque electric motors will be preferred. A strong understanding of both theoretical knowledge and p...

I need a professional to provide 2600 Flash in a widely accepted cryptocurrency like BTC, ETH, or USDT for a Private Placement Program. This coin is only required to sit in a wallet ...60 days. It will not be cashed, traded, or exchanged. Key Responsibilities: - Providing 2600 Flash in a widely accepted cryptocurrency - Transferring the coins into a secure wallet and ensuring they remain untouched for 30 - 60 days Ideal Skills and Experience: - Familiarity with cryptocurrency trading - Experience in Private Placement Programs and related procedures - Trustworthiness and reliability - Strong understanding of digital wallets and their security protocols This is a straightforward task that requires someone who can deliver on time and maintain the security and integrity of the crypt...

I'm looking for a responsible individual to pick up a medium-sized package, weighing between 10 to 50 lbs, and deliver it to UPS in Sweden. They will need to properly provide an address to UPS to have the package delivered to. The package contains miscellaneous items and doesn't require any special handling or care as it's not fragile. Key Requirements: - Ability ...to a UPS delivery center - Prompt, reliable, and communicates effectively Ideal candidates will have: - Prior experience in courier services or delivery jobs - An understanding of UPS delivery procedures and guidelines - Excellent organizational and time-management skills. A brief briefing will be held to provide any additional information on the package and its contents. Timeliness and reliability a...

I am in need of a dedicated software engineer who is proficient in Odoo and Python to help me build a robust CRM system. The project calls for a quick turnaround - I need it to be completed ASAP. Key Features: - Sales Pipeline Management: The system should help me track my sales process from lead generation to conversion. - Customer Interaction Tracking: I want to record all interactions with my customers, including emails, calls, and meetings. - Integrated Email Marketing: The CRM should have seamless integration with my email marketing tools so I can easily communicate with my customers. - Scheduling: I need the system to have scheduling capabilities to help me manage my time effectively. Primary Goals: - Improve Customer Satisfaction: The CRM should help me provide better servi...

I am in need of a skilled software engineer to develop a DICOM printer server software. This software should: - Be compatible with Windows operating system. - Have the capability to print to HP, Canon, and Epson desktop printers. - Support image printing and multiple printer use. Ideal candidates for this job should have strong experience in software engineering and a solid understanding of DICOM features. Familiarity with printer server software is a must, as is the ability to ensure compatibility with named printer brands and operating systems.

Tenho um dominio com um programa de multi atendimento instalado tenho que criar as paginas inicial e com menu tabela de preços, outros produtos e suporte etc exemplo de como eu quero as paginas

...our ship engine assembly processes. - **Performance:** Look into the performance metrics of the assembly line. - **Reliability**: Assess the reliability of our ship engine assembly. Process Insights: - **Workflow Optimization:** Provide insights and recommendations on how we can optimize our workflow for better efficiency and productivity. - Collect datasets for llmRAG and embedding vector database - You should choose the models for llms and RAG and frameworks Ideal Skills: - Proven experience in data science, particularly in the manufacturing industry with a focus on ship engine assembly. - Proficient in analyzing and interpreting efficiency, performance, and reliability metrics. - Excellent at providing actionable insights for process optimization. - Understand...

...need of an experienced WordPress professional to create an informative website. This site will primarily focus on showcasing product and service information. Ideal Skills and Experience: - Expert proficiency in WordPress. - Strong experience in building informational websites. - Comprehensive understanding of producing effective UX/UI. - Ability to incorporate crisp, well-organized product/service pages. - In-depth knowledge of SEO trends. You will be tasked with: - Designing an easy-to-navigate, engaging website. - Ensuring all product/service information is well-presented and easily accessible. - Incorporating responsive design for mobile and tablet users. - Following SEO best practices to maximize site visibility. The perfect candidate should be able to showcase t...

I'm urgently seeking a licensed structural engineer in MA to provide a professional engineer stamp for the construction drawings of my residential building project, which is currently in the building phase. You need to be familiar with residential construction and should have expertise in reviewing and approving such drawings. Ideal Skills: - Structural Engineering - Knowledge of residential construction standards - Familiarity with construction drawings interpretation

I'm looking for a WordPress developer to assist me in fixing some style issues on my website. Quote first one page, then we can talk about refresh of the site, so I need, on elementor 1. fix styling on testimonial 2. fix color on box 3. copy paste some call to actions

I'm seeking a skilled WordPress Brizy web developer to bring my portfolio site to life. Key Points: - Change the layout and design: I'd like a makeover on my current site, with a fresh and innovative design. - Add new sections or pages: I have new work I'd like to add to my portfolio, and I need help creating pages for them. - Integrate plugins or widgets: Implementing these may be necessary for enhancing the overall functionality and user experience of the site. The ideal candidate for this project should: - Have extensive experience with WordPress Brizy. - Demonstrate a strong portfolio of previous work, with a focus on portfolio sites. - Be able to take my design inspirations (which I will provide) and adapt them to suit my site's needs. - I...

I'm looking for a skilled engineer to create detailed drawings for a large (over 300 sq ft) hardwood deck with footings. The purpose of the deck is outdoor entertainment. The right candidate for this job will have: - Strong experience in outdoor constructions - Specific knowledge of hardwood decks - A background in engineering designs with a focus on footings and load-bearing structures - Uphold to industry standards and ensure effectivity of design Please provide examples of similar project designs when bidding.

Tenho site / blog com Post's em WordPress e preciso aprovar ele no google Adsense para monetizar-lo Conseguindo concluir o trabalho tenho outros sites para fazer o mesmo trabalho

I am looking for a specialist in IFRS 9 modelling. The primary purpose of this project is to aid in the financial reporting of my company. Specifically, I aim to achieve more reliable risk assessments through improved modelling. This project will focus specifically on the f...financial reporting of loans and receivables. Therefore, it is crucial for the chosen freelancer to be well-versed in these financial instruments under IFRS 9 modelling. Ideal Skills: - Thorough understanding of IFRS 9 modelling - Experience in financial reporting of loans and receivables - Ability to create reliable risk assessment models Your role will remarkably improve the transparency and reliability of my company's financial reporting. I'm excited to work with a professional who can deliver...

I'm in need of an experienced and reliable Virtual Assistant to help with SEO-related tasks, particularly focused on off-site activities. The primary responsibilities can be categorized into two main areas: SEO Reporting and Off-Site Support. Key details include: - **SEO Reporting**: I need comprehensive monthly reports. The reports should be clear, concise, and easy to understand for someone with a non-technical background. I will provide a detailed format. - **Off-Site VA Tasks**: - **Link Building Outreach**: This is a crucial aspect of the role. Your task will be to reach out to various websites for backlinks. I will provide you with the process and guidelines, but you will need to be proactive in your outreach. - **Backlinks**: You will be expecte...

I'm looking for an AWS DevOps engineer with experience in key AWS services to help with infrastructure provisioning, automated deployments, and setting up a Continuous integration/continuous deployment (CI/CD) pipeline. Key Project Requirements: - Infrastructure provisioning: You should have the ability to set up and manage cloud resources efficiently. - Automated deployments: Experience with automating deployment processes is crucial for the success of this project. - Continuous integration/continuous deployment (CI/CD) setup: The ideal candidate should have a solid understanding of CI/CD principles and be able to implement them effectively. Security Requirements: In addition to the technical requirements, you should be familiar with compliance standards such as HIPAA, ...

...with incorporating user review and rating systems Please include examples of your prior work and any relevant experience in your proposal. Must have: Key Features: 1. User Authentication (Milestone 1 - Login/Signup): - Users will be able to create accounts (signup) and log in securely. - Authentication will be implemented using Django's built-in authentication system to ensure security and reliability. 2. Geolocation Integration (Milestone 2 - Geolocationization): NO API - The website will integrate geolocation functionality to allow users to find nearby restaurants. - Users can either share their location using their device's geolocation feature or manually input their location. 3. Homepage and Restaurant Listings: - The homepage will display a map interface showin...

...Project Components: - The project involves optimizing and automating our assembly line processes. This includes streamlining the control and monitoring of processing machines and ensuring the efficient control of machinery. Key Responsibilities: - Design and develop the PLC control system in alignment with our assembly line automation needs. - Program the system for optimal performance, ensuring reliability and efficiency. - Integrate the PLC system with the rest of our industrial automation setup, to create a seamless, cohesive system. Ideal Candidate: - Proficiency in programming Siemens PLC systems. - Previous experience in automation projects is highly desirable. - Strong understanding of industrial automation in a manufacturing environment. - Excellent problem-solving skil...

I'm seeking a professional to provide a detailed engineer foundation report for an existing structure. My bank requested this report to evaluate the current status and stability of my property, particularly focusing on: - Addressing any potential risks. - Assessing the overall structural integrity. There exist some areas of concern that need particular attention and these include: - Existing water damage. - History of basement floods. Your bid should exemplify experience in structural engineering, risk identification, and assessment of water damage. It's crucial that you understand the specifics of how these issues could impact the foundation's integrity and stability. A background in working with similar situations and a demonstrated ability to produce accurate, ...

...accurate site plan for approximately 20 residential lot development in Jacksonville, Florida. This project requires careful attention to lot sizes and dimensions, as well as adherence to Jacksonville's specific setbacks and zoning regulations. The design should also include necessary road access and infrastructure requirements. The ideal freelancer for this project would have experience in civil engineering or urban planning and have a deep understanding of Jacksonville's local zoning laws. Skills in CAD or other design software are a must. The site location is 3062 Sunnybrook Cr, Jacksonville, Fl 32254 the Lot has an area of 3.47 acres We can split the project in different phases. We need right now the preliminary site plan to

I'm in need of an experienced structural engineer to design a steel platform bridge that is 16ft in length. This bridge will primarily be used for pedestrian crossing, so the design should focus on safety, aesthetics, and resilience to weather conditions. Key Requirements: - Familiarity with bridge construction and design, especially steel platform bridges - Ability to create a design that caters to pedestrian usage - Proven track record of designing safe, effective and resilient bridges - Knowledge and consideration of municipal and national bridge construction regulations. This project is ideal for engineers looking to apply their skills in practical, safety-conscious designs.

...JavaScript (React) - Skilled in Cassandra, OKTA - Experience with Docker, Kubernetes - Familiarity with Google Cloud Platform -Apply with Github and sample projects The project entails creating a robust, multi-tenant web application that can handle multiple users with varying requirements. It is imperative that the selected developer is competent in ensuring the application's scalability and reliability. If you have previous experience building similar applications, please don't hesitate to apply. 1. Specific Requirements and Functionalities of the Web Application Authentication & User Management: Users will sign up and log in securely using OKTA for authentication. Each user will be part of a tenant representing their company. Data Collection: Users will input ...

I'm seeking an experienced mechanical engineer with expertise in CAD to assist me in finalizing the final commercial design for the StarDrive Propulsion system which will be used in satellite station keeping applications. Comprehension of the design is a prerequisite, kindly inform yourself through and my YouTube channels, Dennis Plews and Dennis J. Plews. Tasks will include: - Familiarizing yourself with the existing design - Assisting in implementing specific mechanical components into the final design. Ideal candidate must have: - Proficiency in ANSYS level CAD. - Mechanical engineering experience and background. - Familiarity with integrating specific mechanical components. - Understanding of propulsion systems or similar technology would be beneficial.

I'm in need of a seasoned engineer to implement the Highway Addressable Remote Transducer (HART) protocol within a new RF control system. This protocol implementation will primarily serve to monitor Radio Frequency (RF) components used in aerospace. To be successful in this endeavor, you should possess the following: - understanding and practical experience with HART protocol HW and SW design and development - Familiarity with aerospace RF components and systems (minimal - I'll be doing the RF/microwave system design) - Ability to build a uP control system from the ground up - Extensive experience in device monitoring, end to end HART transmission and reception Understanding of both transmitters, sensors, and valve positioners in context with HART devices would be bene...

...missed, the project will cancel WOO BEFORE GO-LIVE TACTICS Woo site [store] 1. View cart and checkout – just few things, Apple Pay, Google Pay, specials 2. Add last 75 products - Excel 3. Add banners created, make responsive [786 pixels] 4. Upload same banners in mobile size also – mobile view of website needs fixing 5. Body system content pages – add the content; show team member how to add blogs 6. Build one content page from template; copy to five other pages; add content 7. Fix CSS so images are the correct size; AWS server 8. CDN and caching 9. Shipping partner: tracking number sent back to Pay Pal to close out the sale – adjust shipping calculation 10. Content pages for Woo [most will be done after go live] 11. Site speed 12. Rotating produ...

...and troubleshooting windows service applications - Experience with event loggers, from implementation to detailed analysis - Ability to diagnose and rectify issues with message structure formatting - Strong communication skills and excellent attention to detail - Capacity to deliver high-quality work under tight deadlines. Your task will be a crucial step in enhancing the functionality and reliability of our application, hence your commitment to the project is highly appreciated....

I'm looking for a reliable and experienced house cleaner who can commit to cleaning my kitchen, bathrooms, and bedrooms twice a week on an ongoing basis. Key Responsibilities: - Thoroughly clean kitchen, bathrooms and bedrooms - Ensure surfaces, floors, and fixtures are cleaned and disinf...bedrooms twice a week on an ongoing basis. Key Responsibilities: - Thoroughly clean kitchen, bathrooms and bedrooms - Ensure surfaces, floors, and fixtures are cleaned and disinfected - Vacuum, sweep, and mop floors - Change bed linens and make beds Ideal candidates should have: - Previous experience as a house cleaner - Attention to detail - Ability to work independently - Punctuality and reliability This is a long-term project so I'm looking for someone who can commit to regula...

I'm currently in need of a DevOps engineer with a strong expertise in AWS to assist with the development of a Helm chart. We need to deploy 1password scim bridge with helm chart.

We are seeking a California licensed geothermal engineer to conduct a peer review and certification of our ground source 126 ton thermal energy system. The engineer should possess extensive experience and expertise in geothermal engineering and be familiar with California state regulations and licensing requirements. The main responsibilities include reviewing the thermal energy system design, ensuring compliance with applicable codes and standards, and certifying its successful implementation. The ideal candidate should have excellent problem-solving skills, attention to detail, and the ability to produce accurate reports.

I am in need of a skilled engineer, with expertise in both Microsoft Power Automation and SharePoint. The main task will be the automation of email notifications. Ideal Skills: - Microsoft Power Automation - SharePoint - Experience in automating email notifications There's no rush on project completion, quality is key here and I'm flexible on the timeline. Please ensure you've the relevant experience before bidding.

...design as per that we got our brand logo as well which i attached with this project the file name is Brand name & Logo i open to take other ideas for our brand logo so please fill free share the ideas Key Requirements: - Design a medium-sized box packaging specifically for disposable breast pads. - The design should be suitable for the target market - new mothers and women seeking comfort and reliability. - The package needs to reflect the nature of the product - discreet, absorbent, and convenient. Experience: The ideal freelancer for this project should possess the following: - Proven experience in package design, ideally for consumer goods. - Understanding of the target market's preferences and needs. - Strong creativity and ability to translate ideas into visuall...

...currently in need of an experienced WordPress developer to help me update my site. The key aspects of this project include: - **Content/Images**: I need assistance updating the content and images on my site. This will include both adding new content and updating existing information. - **Functionality/Plugins**: I'm also looking to update the functionality of my site. There are several plugins that need updating and some new ones that need to be integrated. - **Editor Error**: Recently, I've been encountering an error on the content editor. This is preventing me from making the necessary changes to my site. It's crucial that the freelancer be able to identify and fix this issue, so I can continue to update my site as needed. Whil...

...is called IMBERA. The company offers services in client advisory for building owners, interim management, consulting, project management, and budgeting. The logo should appear professional, as my clients will be municipal administrations, cantonal administrations, and foundations. It should have recognition value like my abbreviation (see attached image), but it doesn't have to. I am a civil engineer and prefer a clean structure. This should also be reflected in the logo. Looking forward to your ideas! Gerne möchte ich ein Logo für meine Firma erstellen lassen. Auch entsprechend eine Visitenkarte. Die Firma heisst IMBERA. Die Firma bietet Dienstleistungen in Bauherrenberatung, Springereinsätze, Consulting, Projektmanagement und Budgeting an. Es soll eine...

I'm in need of a JavaScript expert who can help me to optimize the custom JavaScript code on my WordPress website. Key Tasks: - Optimize: The code needs to be optimized for better website performance, as it's currently causing slowdowns on the site. - Refactor: The code was initially created by someone with limited experience, so it needs to be refactored to follow best practices and be more efficient. - Review: The code needs a detailed review to identify and address any syntax errors or functionality issues. The main goal of this script is to create a slideshow from an image sequence. This slideshow is an integral part of the website's design and user experience, so the code must be functional, efficient, and fast. The current script works, but it's far fro...

I'm seeking a skilled freelancer to efficiently digitize text data from scanned documents emailed to them. The project involves meticulous data entry work to ensure high accuracy and reliability in digitizing a variety of texts. **Key Requirements:** - Proficiency in data entry with a strong focus on text conversion. - Acute attention to detail to maintain the integrity of the original documents. - Ability to work with scanned documents, interpreting and entering data accurately. - Basic understanding of document formatting to organize text data logically. **Ideal Skills and Experience:** - Previous experience in data entry, particularly with texts derived from physical documents. - Proficient typing skills with high accuracy rates. - Familiarity with different digital for...

I'm seeking a PCB engineer to conduct rigorous PCB fab house audits and internal engineering efforts. Your primary task will be conducting inspections in line with IPC standards and internal standards flown down to PCB fab houses. I have a 6 month contract (renewable) available for someone who can qualify PCB fab houses and intimately understand IPC 6012/6013. Must be a US citizen due to industry specific requirements. Here's what I need: - Thorough PCB house audits/ inspections as a supplier qualification - Uses IPC standards for defining discrepancies as found by an inspection team - Provide detailed inspection reports as needed Ideal Candidates: - Experience in PCB Quality Engineering - Familiarity with IPC standards - Has excellent attention to detail.

I'm in need of a skilled designer to create a logo for my company that combines text and icon elements. The design should be both elegant and sophisticated. The final product should convey a sense of professionalism and reliability. Ideal skills for this project include: - Experience in logo design - Ability to combine text and icon elements effectively - Understanding of elegant, sophisticated design aesthetics - Ability to reflect professionalism and reliability through design I look forward to seeing your creative solutions.

... secure, and efficient web applications. - Strong understanding and experience with MySQL database management. - Ability to ensure the application is well-structured and follows best practices for data handling. - Strong problem-solving skills and the ability to work independently. ?️ Key Responsibilities: Design and develop the backend system using Core PHP, ensuring high performance and reliability. Implement secure authentication and authorization mechanisms to protect sensitive data. Integrate with external APIs and services to enhance functionality and interoperability. Optimize database queries and data storage to maximize efficiency and scalability. Collaborate with frontend developers to ensure seamless integration between the frontend and backend components. Conduct th...

I am seeking a skilled professional to set up a WordPress eCommerce site for my business. This site will carry well over a 100 different products. Key Requirements: - Implement and manage eCommerce features specifically, a functional shopping cart and a product review platform. - Experience with WordPress eCommerce platforms is a must. - Ability to organize a large number of products into a smooth and navigable interface. - Should provide basic training so I'm capable of maintaining site after setup. Your demonstrated work history in setting up successful eCommerce sites on WordPress would strengthen your proposal.

...homepage design. It should be easy to navigate, ensuring visitors can easily find what they're looking for. The content currently present will be slightly changed and reorganized by us and you will be provided with all the updated textual content. - **Colors**: I have a preference for pastel and soft colors. The color scheme should be inviting yet professional, creating a sense of trust and reliability. - **Graphics**: I'm looking to enhance the aesthetics of the homepage through well-thought-out 3d ilustrations. These should be complementary to the color scheme and related to the service offered on the website. The ultimate goal of this redesign is to boost sales and conversions. So, the new design should be crafted with this objective in mind. Ideal Freelancer: - P...

I'm in need of a proficient developer to create a products slider for my e-commerce website. This slider should automatically scroll through products showing both the product image and price. The main tasks include: - Implementing an automated slider: The slider should scroll through products at a predefined pace, without requiring u...development: As the slider is a visual element, a strong grasp of front-end development is key. - E-commerce experience: Understanding of e-commerce platforms and product displays is beneficial. - Slider development expertise: Experience with slider implementation, especially with automated features, will be a big plus. This project is a key feature of my website, so attention to detail and reliability are important. Looking forward to seeing ...

I'm seeking an experienced DevOps engineer who is proficient in deploying React Frontend and .NET Core 8 applications to Alma Linux with NGinx server. The candidate should have solid experience with: - Deploying React FrontEnd and .NET Core 8 Web API applications on Alma Linux in GoDaddy VPS. - Knowledge of routing of both applications with one domain and one SSL. - Knowledge of handling SubDomain. - Knowledge of Alma Linux Nginx deployment. - Understanding of .NET Core Application Settings and React.JS application settings - Understanding of Node.JS