Php ordering app jobs

I'm looking for a skilled PHP developer to enhance my existing gym management system with a set of new features. Key Modifications: - **Payment Processing Integration**: I need a custom payment gateway integrated into the system. - **Access Control Device Integration**: The system should be connected to access control devices such as turnstiles with fingerprint readers to streamline member access and enhance security. - **Whatsapp Notifications**: Implement a feature that sends notifications to members via Whatsapp for marketing and service updates. Ideal Skills: - Proficiency in PHP and experience with gym management systems. - Experience with integrating custom payment gateways. - Knowledge of setting up device integrations. - Understands API integration for Whats...

I'm in need of a skilled PHP developer to create a comprehensive backend system for my project. The primary functions required for this system include: - User authentication: The system should be able to allow users to register, login, and manage their accounts. - Data storage and retrieval: The system will need to store and retrieve various types of data in an efficient and secure manner. It's also important that the backend system integrates with existing databases and APIs. Please note that the specific level of user access control has not been decided yet, although it's likely we'll need more than just basic access controls. Ideal skills and experience for this project include: - Proficiency in PHP and backend development - Experience with integr...

I'm seeking an experienced PHP developer to integrate a hosted payment page into our current system. The primary focus will be on the following key areas: - Integrating an SDK to facilitate payment processing - Ensuring compatibility with multiple currencies The ideal candidate should have a strong understanding of PHP and prior experience in payment gateway integrations. Experience with various payment gateways and supporting multiple currencies will be a definite advantage. You should also be proficient in handling SDKs and be able to implement them efficiently. Your understanding of security measures in payment processing will be highly valued. Please provide samples of your previous work in this domain.

I have a stock management system written in PHP. Currently, I'm facing an issue where after adding a payment, the payment is successfully added but the page fails to redirect and shows an error 500 instead. This redirection should take the user back to the previous page. Ideal skills and experience for this project include: - Proficiency in PHP programming - Strong understanding of web development - Experience with payment processing systems - Familiarity with error handling and debugging The task for the selected freelancer will be to troubleshoot this issue and correct it, ensuring that the payment is added successfully and the user is redirected to the previous page without encountering the error 500. A smooth user experience is crucial.

I have a Laravel PHP script that needs a complete revamp. I need a skilled developer to modify its database structure, update the user interface, and add new functionalities. This job is urgent, and I need it completed as soon as possible. Key Requirements: - Extensive experience with Laravel PHP and databases - Proficiency in updating user interfaces - Ability to add new functionalities to an existing script I appreciate your prompt response and delivery on this project. Thank you.

Looking for a dedicated developer to design a minimalistic playlist with PHP and HTML. This playlist should support functionalities including: - Play, Pause, Skip options - Add, Remove, Edit Songs - Shuffle, Repeat, Loop features Moreover, it should support MP3, WAV, and FLAC files. I prefer a minimalist design leaning towards clean lines and simplicity. It is crucial for the user interface to be intuitive and easy to navigate, providing the best user experience possible. Desirable skills and experience: - Proven experience in PHP and HTML languages - Portfolio of projects showing aesthetics understanding - Experience creating digital media players, preferably music playlists. Apply if you have a passion for achieving perfection through simplicity...

I need to connect my POS-PHP system through a web service or API to the software of a Colombian technology provider that provides this service. I attach the webservice manual and an example of the xml that my program must generate to call the information. I need to connect my POS-PHP system to the software of a Colombian technology provider that offers this service through a web service or API. I have attached the webservice manual and an example of the XML that my program must generate to call the information. Please contact me if you do this - +91 9598514789 The project is in Spanish language

I'm in need of a skilled developer to create a cross-platform app for my social networking script. The app is intended to focus primarily on photo and video sharing, similar to popular applications like Instagram. Ideal Skills and Experience: - Proficiency in both iOS and Android app development - Prior experience working on social networking scripts and app development - Strong understanding of photo and video sharing features - Capability to replicate and customize Instagram's user interaction, including: - Likes and comments The app should be user-friendly, engaging, and seamless across both major mobile platforms. Prior experience in developing similar applications is a plus. Your bid should include a brief outline of your proposed appr...

I'm seeking an experienced PHP Developer with a sound understanding of Laravel, to help build the Minimum Viable Product (MVP) of a Meeting Room Management System. This system will help manage booking functionality, room availability status, and robust user authentication procedures. Key features should include: - A Calendar-based room booking mechanism. - Real-time room availability status checker. - Strict and secure user authentication system. The user roles in the system will be categorized as: - Administrators - Who manage the whole system. - Regular Users - Who use the system for room booking. For this job, a developer with solid experience in PHP programming, Laravel, database management, and user authentication methods would be highly preferable. Familiarity ...

I'm looking to update our website. - Add phone verification - Google authentificator - Disabled login when using proxies - Add some feature like : pagination, referal link, enable adding video to our submitting form and and show them in our games(already showing images and textes). -url rewriting - localisation : redirect user upon country for the moment french and english and create language file for eg. for registration, password and messages -fix some redirection issues - update admin Will give all updates in messages..

PHP developer to work on my website.

I'm seeking an experienced inventory manager to oversee our retail supermarket's stock. You should be able to handle the following responsibilities: - Efficiently tracking and managing inventory - Handling stock replenishment and ordering - Conducting sales projections for profitable products Our supermarket currently uses a Point of Sale (POS) system for inventory management. As such, familiarity with this software is a plus. You will be expected to provide daily reports on stock levels and sales data. The ideal candidate for this role should have previous experience working with retail inventory management, have a strong understanding of POS systems, and be able to translate data into actionable insights for improving our inventory and profitability.

I'm looking for a skilled PHP developer to work on a project that involves developing a robust backend and frontend using HMVC-CI3. The project will require integrating third-party data and some API work. Additionally, there are some bug fixes and modifications needed on both the front end and back end of the site. The ideal candidate should have the following skills and experience: - Proficient in PHP, specifically HMVC-CI3 - Strong experience with API integration and third-party data integration - Ability to fix bugs efficiently - Comfortable working on both the front end and back end of a website Working at (Saturday & Sunday)

As the project owner, I am seeking a proficient PHP developer who can work with us on an hourly basis. Ideally, we are looking for a developer based in Jaipur, but quality and skill are our top priorities. Here's what you need for this project: - Expertise in PHP Front-end and Back-end development. As we are focusing on developing a web application, it's essential for you to be well-versed in creating dynamic and interactive applications. - You should have a solid understanding of PHP development, able to tackle complex problems and deliver efficient solutions. - Concerning frameworks, while we didn't mention a specific one, familiarity with popular PHP frameworks like Laravel, Symfony, or CodeIgniter would be a plus. - Lastly, an appreciation...

we have web app build on core php some functions not working after migration we need someone quickly investigate and fix them thanks

I'm urgently in need of a PHP and HTML expert to make my contact form on a HTML5 Bootstrap website work. Lowest price wins, we have more than 10 projects open tht you can work on afterwards. There are several fields like Name, Email, Message and File upload that need to work so i receive the submitted form. Furthermore i need you to make a success site that users are redirected after filling out the form to integrate my google advertising. The user should be redirected to that success page where there is a success message like "Thank you for your message, we will get back to you soon" and after a countdown of about 10 seconds automatically be redirected to main website again.

As the driving force behind this project, I am seeking an exceptional Android Java Developer well-experienced in building e-commerce applications. Catering Marketplace service for ordering food to the office and for events. One contract with app gives you access to hundreds of proven restaurants, thousands of dishes of various cuisines, exclusive promotions and corporate discounts. A personal manager is always ready to help with the selection of the menu. Redefine the catering booking experience Our mission is to be the best customer centric catering booking platform to integrate the latest fabulous food items into these trends and present it in a way that embodies the uniqueness and flair+ Specifically, your task will revolve around the development of a food catering appli...

I have an existing crm , where i need modifications and addons I'm in need of an experienced PHP developer to help me with some minor addons for my project on an urgent basis. Specifically, I need help with: - Email Notification: Implementing a feature that sends email notifications to users when certain events occur within the platform. - Captcha Integration: Adding a Captcha system to enhance the security of the project. - Social Media Sharing Buttons: Integrating social media buttons to allow users to easily share content from our platform. I'm looking for someone who is proficient in PHP, has experience with developing addons, and can work efficiently to deliver the project as soon as possible. Your attention to detail and ability to meet deadlines will be gr...

...in PHP development to make modifications to my website. Top deliverables include: 1. Password-Protected Posts: I'm looking to offer my website users the capacity to create and access password-protected posts. But not just that, I want to allow password protection for specific categories or tags as well. 2. Responsive Design: Although I've not specified my exact requirements, I'm hoping for a design that stays responsive across a variety of devices. Even though I have a preferred design aesthetic, I'm open to your expert suggestions on the best way to implement this. 3. UI Improvement: Lastly, the overall user interface could do with a few tweaks for better accessibility and engagement. If you're detail-oriented, have prior experience in similar proj...

I'm seeking an experienced PHP developer, with skills in JavaScript and MySQL. I have a Production System that requires an immediate update to have additional product types listed for sale in it's custom PHP Cart System that uses a dynamic pricing table and Calendar module. I have tutorial videos on its functionality to help guide you. However, the two new product types are new to the system and will need to be created. Key Requirements: - Expertise in PHP, MySQL, JavaScript - Constructive problem-solving skills - Ability to adapt to unknown project scopes. Your role may involve building complex applications or simple website scripts. With the uncertain nature of the tasks, a flexible and proactive approach is ideal. It'll be a bonus if you've wo...

Add Payment QR In Franchise Login Profiles of all the members to be shown. currently it is showing only his profiles Multiple profiles can be created by a single mobile and email Change the Name of Franchisee to Director In the Front Menu Add the Link called Director Login Add Match making option in the franchise Add Upload Photo Field in the and Location In Login add Mobile number also as username Add Name field in Filter profile

I'm in need of a full-fledged Billing and Inventory Management System (IMS) web application using Core PHP. This application is intended to streamline various aspects of my business and I hope to incorporate the following features: - **Inventory Management:** The system should allow me to keep track of my inventory levels, manage stock, and generate inventory reports. - **Sales Tracking:** One of the key functionalities I seek is the ability to log and track sales. This should include details like date of sale, item sold, quantity, and pricing. - **Customer Management:** The system should enable me to manage my customer base. This includes keeping records of customer orders, contact information, and any other useful data. - **Profit and Loss:** The application should provide i...

I'm seeking a proficient developer capable of creating a PHP-based email system using Gmail's service or any other service provider. The functionality should support sending emails to single recipients. It's essential that you incorporate an attachment feature enabling the secure attachment of files to emails. Ideal skills and experience: - PHP development expertise - Demonstrable experience with Gmail APIs - Knowledge on secure file attachment implementation in emails - Attention to detail and timely delivery Your bid should detail your experience and proposed approach, including timelines. Looking forward to your responses!

I'm in need of a skilled developer to integrate my WooCommerce plugin with third-party systems, specifically for a MENU & FOOD ORDERING management system. The project has a primary focus on: - Integrating the WooCommerce plugin with third-party systems, to create a MENU & FOOD ORDERING management system. - The main goal for this integration is to streamline my online menu display and food ordering process. The ideal candidate for the job would have experience in both WooCommerce and WordPress plugin development, and a strong understanding of third-party system integration. Additionally, previous experience with developing MENU & FOOD ORDERING systems would be highly beneficial. Please only apply if you have proven experience in these areas.

I'm seeking a talented app developer to design and build a user-friendly food ordering platform specifically for Android devices. The key features of this app should include: • User registration: The app should have a robust user registration feature, enabling customers to sign-up and maintain personalized profiles. • Menu browsing: Integration of a comprehensive and easily navigable food menu is crucial. The menu should allow users to browse a wide variety of dishes, add to cart and place orders. Although not mandatory, experience in UI/UX design and a background in creating similar food-based apps would be a great advantage. The app should also support UPI - a popular payment interface in India - for transaction purposes. If possible, i...

I am looking for a skilled PHP developer for my upcoming project. Even though the specific PHP frameworks were not specified, I would greatly appreciate it if you have a broad knowledge base which includes Laravel, CodeIgniter, and Symfony. This allows us to brainstorm and decide on the perfect technology for our unique needs. Requirements for the application: - It's a blank slate, and I look forward to hearing your suggestions. Would you please include your past work and experience in your application? Detailed project proposals are also welcome. - Despite not having particular functionalities in mind currently, a developer with experience in user authentication, payment gateway integration, and database management will be highly desirable. Essentially, I am looking f...

I am looking for a skilled PHP developer for my upcoming project. Even though the specific PHP frameworks were not specified, I would greatly appreciate it if you have a broad knowledge base which includes Laravel, CodeIgniter, and Symfony. This allows us to brainstorm and decide on the perfect technology for our unique needs. Requirements for the application: - It's a blank slate, and I look forward to hearing your suggestions. Would you please include your past work and experience in your application? Detailed project proposals are also welcome. - Despite not having particular functionalities in mind currently, a developer with experience in user authentication, payment gateway integration, and database management will be highly desirable. Essentially, I am looking f...

I am looking to add a cache busting feature to a website. I am receptive to paying for milestones or paying hourly if we end up communicating a lot while the work is done. The PHP site consists mostly of 1 mostly HTML page with a long list of links to a directory full of PDF and MP4 files. Sample code is attached. Each can be opened in a Fancybox Modal window. Sometimes the PDF/MP4 files are overwritten with a newer version with the same exact name. Of course browsers often use the cached version instead. The files are big enough where I want the browser to cache them, but only until they change - then the browser needs to grab the new version from the server. The apache and .htaccess expire headers haven't done what I need. I read that some codebases exist that will assig...

I need a PHP script to generate QR codes ASAP. The script should be able to customize the QR codes with colors and logos, and further, with rounded eyes and data. A sample will be provided. Preferred solution using chillerlan/qr-code ... but other solutions might be used as well. Key Features: - The primary function of the script is to generate QR codes. - I need the option to customize the QR codes with colors and logos. - Additionally, I require the ability to customize the QR codes with rounded eyes and data. File Formats: - The generated QR codes should be exportable in PNG and SVG file formats. Timeframe: - This should just take a few hours. Ideal Skills and Experience: - Expertise in PHP and QR code generation.

I'm seeking a talented web developer to create a dynamic website for my restaurant. The primary goal of this website is to increase online orders, hence it should be designed wit...customer feedback form. This will help us improve our services and respond to any issues promptly. Ideal skills and experience for this job include: - Proficiency in web design and development with a good understanding of user interface design principles. - Experience in creating dynamic websites, particularly for the restaurant industry. - Strong knowledge of e-commerce platforms and online ordering systems. I'm looking for a developer who can deliver a high-quality, SEO-friendly website that can drive online orders and enhance customer experience. Please provide examples of similar projects...

As a burgeoning project in demand, we're in need of a Full Stack PHP Developer with a good command of both frontend and backend development. For our backend development, we prioritize: - Proficiency in PHP, MySQL & Laravel When it comes to the frontend, we value: - Experience with Javascript & Web Designing using HTML & CSS. Knowledge on VueJs will be Plus. We're specifically looking for someone at an intermediate level, who has: - A solid grasp of Javascript & PHP. We're excited to welcome a competent, committed developer to our team. Bring your A-game, and let's create something great together.

I need to train a model with a dataset and need help with it. The objective is to guide me to run the available code by ordering it and training it with a dataset on google colab, also provide a document as a read me file to explain it. The code is of a research paper with the name Sequential Weakly Labeled Multi-Activity Recognition and Location on Wearable Sensors using Recurrent Attention Network. The link for the paper is Also the verified code is at and the ipynb notebook is attached below, the snippets are to be reordered in order to run it as per the research paper and train it with Uni-Mib SHAR dataset which is availabe in NumPy format. The needed

I'm in need of a skilled PHP developer to create a professional and corporate-style website that effectively displays my company's history and the products or services we offer. The primary purpose of this site isn't to sell products or services, but rather to provide information about our company in a comprehensive and engaging manner. Ideal Skills & Experience: - Extensive PHP programming experience - Prior history of creating professional, corporate-style websites - Ability to effectively present a company's history and services via web design - Strong understanding of modern UX/UI principles - Vietnamese is preferred Website Elements: - Detailed company history section - Comprehensive outline of offered products or services Design Preferences:...

I am in search of a skilled and experienced PHP developer to join our team in Dubai. The ideal candidate will have extensive experience, specifically in CodeIgniter, and be able to handle various responsibilities including front-end, back-end, and database management.

I'm looking for an experienced mobile app developer to help create an engaging and user-friendly app for my small lounge & cafe. Key Features: - Menu Display: The app should display our menu in an intuitive and visually appealing manner, allowing users to browse through the dishes and drinks we offer. - Table Reservation: We want a function that enables customers to reserve tables in advance through the app, making it convenient for them and helping us manage table allocation. - Ordering and Payment: The app should allow users to place orders from their tables, and complete payment transactions securely and conveniently through the app. The ideal candidate should have: - Proficiency in developing cross-platform mobile application...

As a burgeoning project in demand, we're in need of a Full Stack PHP Developer with a good command of both frontend and backend development. For our backend development, we prioritize: - Proficiency in PHP, MySQL & Laravel When it comes to the frontend, we value: - Experience with Javascript & Web Designing using HTML & CSS. Knowledge on VueJs will be Plus. We're specifically looking for someone at an intermediate level, who has: - A solid grasp of Javascript & PHP. We're excited to welcome a competent, committed developer to our team. Bring your A-game, and let's create something great together.

We already have the layout for the ordering system. The code for the menu , ordering function is already set up. We need someone to implement a few more features to our code. Key Features: -Menu: The ordering system will display menu items -Customization: Customers will be allowed to make customisations to their liking from the menu -Social media food trendy(popular items)- Customers can view social media posts that people have uploaded to see what dishes are good and view food inspiration. -Live feedback- Customers can track how long their order will come to the table. Reviews- Customers can leave reviews and rate the food. -Reservations- Customers can reserve a booking - User login - user page for accessing the customer view -Order history- Customers can view order h...

...Laravel PHP developer to assist me with maintenance tasks on my existing website. Key Aspects: - I need assistance with maintaining and enhancing an existing Laravel PHP website. The key tasks are: - Fixing bugs and errors: There are some broken links, page loading issues, form submission errors, and other functional deficiencies that need to be addressed urgently. - Updating plugins and extensions: The website relies on several plugins and extensions which need to be updated to ensure compatibility and optimal performance. - Optimizing website speed and performance: It's essential to improve the website's speed and performance, this may involve code optimization, database tuning, or other performance-enhancing techniques. Skills and Experience: - Profic...

I've been grappling with a login issue on my Pterodactyl panel, which is hosted on a Virtual Private Server (VPS). Whenever I try to login, an error page is displayed instead of allowing access to the panel. Furthermore, the Pterodactyl panel is integrated with a Content Management System. I'm seeking an experienced PHP developer who can diagnose and solve this issue efficiently and effectively. Key Skills and Experience Required: - Proficiency in PHP - Familiarity with Pterodactyl Panel - Experience handling VPS - Knowledgeable in resolving login issues - Experience with Content Management Systems is a plus Looking forward to receiving your informed bids, highlighting any similar issues you've resolved.

I'm excited about my new cafe and want to create a user-friendly, feature-rich website to drive local customer engagement. Here's an overview of what I'm looking for: - **Functionalities**: I need an online menu and ordering system, table reservation system, and an events calendar integrated seamlessly into the website. - **Target Audience**: The primary target audience for this website is local residents. Therefore, the website should be designed keeping their preferences and needs in mind. - **Content Management**: I would like to manage the website content myself with a Content Management System (CMS). This is important for me as I want to make sure the website stays up-to-date with the latest offerings and events at the cafe. I'm looking for a skilled and e...

Need help with MVP for mobile app and the creation of an admin portal. The mobile app will create meetings and allow users to send/accept meeting invites. This work will need to be done in React Native so I get Android and iOS. I have sketched out the look and functionality of the app in the attached pdf file. The app name, app logo and app icon will be given after project is awarded. Please plan to use shades of blue and white Please provide price and delivery time with quote. PAYMENT TERMS: Total will be paid over 3 milestones - deposit, testing and final acceptance Note: Freelancer will be asked to sign freelancer.com's standard IP Transfer Agreement as part of this project

I'm seeking a freelancer with experience in OpenAI's embedding models and GPT4, PHP, and the Github openai-php client. I have pre-existing PHP and code base, our prompts and functions we use, this all works perfectly, we're not needing you to integrate this into our existing system, simply modifying our functions to make use of the correct embeddings, preparing embeddings, and how to store them. What we want done: We are an SEO agency that has different clients, we want to be able to upload content pages and blog articles the client has on their website and then use this for context and understanding of what our clients do and the way they write. We have all this information stored for each client already, we need to format it and prepare it in the co...

I am seeking an experienced PHP developer to fix functional errors in my PHP code that's designed for searching text data in a MySQL database. The primary function of the code is to facilitate this search, hence it's crucial that these errors are addressed in a timely and efficient manner. Key Responsibilities: - Identify and resolve functional errors in the PHP code - Ensure smooth and accurate search functionality for text data in the MySQL database Ideal Skills and Experience: - Proficient in PHP programming with a strong understanding of MySQL database - Previous experience in fixing functional errors in PHP code - Ability to conduct thorough testing to ensure search functionality is robust, accurate and efficient This project is time-se...

I want to switch reading input from a file to reading from a database table. This can be achieved through the creation of a MySQL database table and performing some essential CRUD SQL statements. Upon completing this, I should be able to: • From a PHP page, create a MySQL database • From a PHP page, create the appropriate tables • From a PHP page, apply CRUD operations using SQL language

As a client, I am in need of a skilled PHP developer who can construct a web-oriented antibot redirect script. This project entails creating a PHP script that will redirect users to another website Ideal skills and experience for the job are: - Extensive PHP coding knowledge and experience. - Familiarity with antibot measures and script creation. - Track record of creating successful redirect scripts. As the client, I have not stipulated specific conditions that should trigger the redirect. This implies flexibility, hence, understanding my requirements and suggesting the optimal conditions will be appreciated. Furthermore, it should be highlighted that the antibot redirect script is only required for web pages, and not for API endpoints. The successful applicant wil...

I am seeking an experienced developer to build a dynamic and complex web application utilizing PHP, MySQL, and JScript. Key functionalities required: - User authentication - Data input and retrieval - Dynamic content generation - E-Wallet - Money Transfer - Shopping Cart - Admin Panel - API Integration - Mobile Recharge - Crypto Wallet - Payment Gateway Integration - Crypto Integration The project requires a clean and professional design that effectively highlights its diverse functionality and usability. There's no specific framework required for this project, allowing developers the freedom to use the ones they are most comfortable with. Ideal Skills: - Extensive experience in PHP, MySQL, and JScript. - Proven track record in building dynamic web apps. - In-depth u...

I'm in need of a PHP script to pull bank transaction data from Plaid once a day. This is a simple project and can be very ugly. I will adjust the code once I have the working script. This is what I need. A single page with a button that I can click to "Link Bank Account". This will go through the process that Plaid uses to authorize access to banking data. It should return authorization tokens... Then I need the authorization tokens to be stored in a text file in the same directory. I will re-route these into my database once I have the script. I also then need one single PHP function that can retrieve bank deposits for that linked account. I will adjust the script to pull in whatever deposits I need so for now it can just pull in any deposits. Those ...

I am seeking a skilled PHP developer to construct a to-do list creator. The completed solution needs to exhibit the following attributes: - Functionality for creating and editing tasks, - Automated deadline reminders, - Task prioritization capability, - Organizational options for tasks by due date, priority level, and category. - As will provide the GUI and the DB structure - You need to use the Codeigniter framework - No signup or login required , as we are going to use your code in our existing application Given the immediate need for this project, a timely execution is crucial, with bids promising swift delivery favored. Applicants should have an extensive portfolio demonstrating their fluency in PHP and proven experience in similar projects.

I've been grappling with a login issue on my Pterodactyl panel, which is hosted on a Virtual Private Server (VPS). Whenever I try to login, an error page is displayed instead of allowing access to the panel. Furthermore, the Pterodactyl panel is integrated with a Content Management System. I'm seeking an experienced PHP developer who can diagnose and solve this issue efficiently and effectively. Key Skills and Experience Required: - Proficiency in PHP - Familiarity with Pterodactyl Panel - Experience handling VPS - Knowledgeable in resolving login issues - Experience with Content Management Systems is a plus Looking forward to receiving your informed bids, highlighting any similar issues you've resolved.

I'm looking to build a social networking script in PHP, inspired by Twitter. - I need user profiles, a news feed, and a messaging system, like most social networks. - The standout feature will be similar to Twitter threads: - Users should be able to respond to a tweet with threaded conversations. - There should be visibility controls for these threads. Another key requirement is for this script to support tweet threads, unlike in Twitter where it is mainly a single message. Ideal Skills: - Proficiency in PHP for scripting the networking features - Familiarity with popular social networking sites, especially Twitter, to effectively implement the thread feature - Experience with database management for user profiles and messaging systems - Solid understanding of...