Rails backendcông việc

I'm currently having trouble with my Plasmo browser extension. The problem lies in the data processing, specifically, there seems to be a duplication issue happening in the backend that's negatively impacting the user interface. Tasks: * Identify and correct logic discrepancies causing incorrect data processing * Fix duplicated backend processing impacting the user interface * Convert extension to all chromium browsers, safari, firefox Ideally, I'm looking for someone that has experience in Chrome extension development. If you've previously worked on the Plasmo browser extension, that would be a huge plus. In your application, please provide examples of your past work, specifically projects that centered around resolving similar issues. Skills Requi...

I'm looking for a proficient developer with experience in .NET and MAUI (Multi-platform App UI) to implement a geofencing feature into a front-end application. This role requires excellent skills and understanding of geofencing technology, GPS location, and device ID validation. Key functionalities in this project in...geo fenced location mark out . Also, a prompt should confirm successful attendance marking. * Geo-fenced territory notification: Apart from tracking attendance, our system should enable other feature of the app in a specific territory . Therefore, the ideal candidate must have prior experience developing with .NET and MAUI, solid knowledge of GPS location tracking, device ID integration, and backend notification systems. Previous work with geofencing systems ...

As the client, I'm looking for a highly skilled Laravel developer who is adept at both frontend and backend development, as well as managing and designing databases. The primary goal for this project is to build a functional web application. Your responsibilities will include: - Frontend development: Developing interactive, user-friendly interfaces that are efficient and reliable. - Backend development: Building robust, secure server-side applications that efficiently manage the logic and server response to user interactions. - Database design and management: Designing and managing a flawless database to ensure data consistency, clarity, and security. While I do have a design in mind, the developer should feel free to propose any changes or improvements to the design. ...

We create a SAAS that gives vendors the opportunity to sell gift cards. These giftcards can be redeemed at the vendors shop. We also need the option that we can sell giftcards for our own. These giftcards can be redeemed at all connected vendors....giftcards for our own. These giftcards can be redeemed at all connected vendors. These functions are required: - Create a PDF document which is the giftcard - Integration of Stripe Connect include invoicing - Scan QR-Code to redeem a giftcard - No design. Just use like and follow my sketch (all items are centered) - There are no other functions. Just interaction from frontend to backend for data entries and display data - Techstack MERN or similar - Installation on a VPS We have detailled spcifications. Feel free to ask ...

...startup in the language learning industry, working on a platform that connects students with one-on-one teachers. Our project is near completion, and we are seeking experienced and talented full-stack developers to help us with the final stages and polish of our platform. Responsibilities: Collaborate with the existing development team to finalize frontend components using Vue.js 3. Contribute to backend development using Node.js, ensuring seamless integration with the frontend. Work on database-related tasks using MySQL for efficient data storage and retrieval. Implement and optimize features to enhance the overall user experience. Collaborate with the UI/UX designer to ensure a visually appealing and user-friendly interface. Requirements: - Proven experience as a full-stack ...

I'm looking for a skilled developer to create a robust stock market trading platform similar to PrimeXBT. The project should be completed within a month. and i want this platform with admin demo and user demo both frontend and backend Key features should include: - Real-time market data to provide immediate and up-to-date information. - Advanced charting tools to visualize the data effectively. In terms of trading instruments, the platform needs to support: - Stocks - Cryptocurrencies - Forex Ideal candidates for this project would have experience in trading platforms, algorithmic trading and financial markets, and a strong understanding of real-time data processing. Knowledge of cryptocurrencies is a plus.

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)

...This allows them to log in and manage requests. Accountability and Feedback: Employees have the ability to mark the status of each request - whether it has been processed, as well as add a comment about the progress of the process and the result of connecting with the customer, including information about successful and unsuccessful sales. Technical requirements: Use Laravel for backend. Use Laravel migrations to create the tables. Implement Eloquent to interact with the database. Integrate Laravel Mail to send emails. For frontend, use Blade along with Bootstrap (or Tailwind CSS). Maybe something ready, open-source. Frontend is not a priority. Optional: - Write Pest (or PHPUnit) tests to verify and ensure the operation of core functionalities, incl...

I'm looking for a proficient full stack developer with a focus on Flutter, UI/UX design, and MongoDB, who has a strong background in mobile app development and building property rental apps. Key Responsibilities: - Develop a mobile application for a property rental platform. - Implement backend services using MongoDB for data storage and retrieval. - Create an intuitive and appealing user interface with a strong focus on UI/UX design. - Ensure the application is responsive and performs optimally on various devices. Ideal Skills: - Proficiency in Flutter and MongoDB. - Strong UI/UX design skills. - Previous experience with mobile app development, particularly in the property rental space. - Excellent problem-solving and communication skills. - Ability to work in a collaborati...

Hi, We have some high-level reporting analyst questions. For someone with solid experience, they would not take long to discuss. While this work is short and straightforward, there may be more, ongoing work on the backend. Here are some of these questions and I will mention that we already have some material that we can share: How do you approach gathering and cleaning data from various sources? What tools and software do you have experience with for data analysis and reporting that you would recommend or not recommend? How do you ensure the accuracy and integrity of your reports and analyses? Can you discuss a time when you had to present complex data findings to non-technical stakeholders? How did you make the information accessible and understandable? What methods do you...

Search for a Laravel developer to add waybill printing to an inventory management project

I am seeking a highly skilled Java developer/team to build a robust and efficient option greek calculator specifically tailored for Indian options using Black Scholes model. A user-friendly Java interface (No UI interface, only backend java interface) will facilitate easy interaction with the calculator. Key Features Input 1. Option symbol (e.g., NIFTY, RELIANCE) 2. Option expiry date 3. Target date to expiry (number of days remaining until target date) 4. Underlying symbol price target (predicted price of the underlying asset on the target date) 5. Lot size and number of lots (for position sizing calculations) 6. Optional volatility input Output 1. Option greeks (Delta, Theta, Decay, Gamma, Vega) for each available strike price 2. Standard deviation for the underlying asset bas...

I am looking for a developer to further develop a chatbot website, using Next.js. Scope of work: 1. App page UI / API work. (No backend) 2. Landing page integration 3. Google Analytics Integration App page: I have already made a version 1 - shown on the right 4 - I will share full source code to make it easier for you. I want to convert it to the left three shown. See figma: (Copy)?type=design&node-id=206%3A2&mode=design&t=FF4CG64iJFrgALzd-1 I have made the backend APIs, so you will not need to do anything in the backend. I will share postman and specific instructions on how to use. Note that the model on the right will be supplied as a gltf file, you will need to use gltf loader to load it, orbitcontrols to show it around

As an experienced individual or a team, I'm on the hunt for a seasoned full-stack Laravel developer for my new informational website. As a professional, I'm sure your skills and expertise will provide the perfect platform for my website's design and functionality. Ideal Skills Required: - Comprehensive Laravel knowledge and experience. - Full-stack capabilities including frontend and backend. - Solid experience with Informational Website Creation and Management. - Strong skills in error-free coding and debugging. - Deep understanding of server-side logic & database schemas. - Creativity and understanding to execute the given design concept. - Ability to work full time as the project requires dedicated and focused talent. Your expertise in Laravel is crucial as...

sns automatic upload Automatic upload to Instagram, YouTube, and blog How it works 1 Enter content image text on the website 2 Send content to the upload app 3 Automatically upload SNS Instagram, YouTube, TikTok, and blogs preset in the upload app Please contact only developers who can make it as quickly as possible in the shortest possible time. What you need to create: A website We need to create an app that can automatically upload to SNS from a phone. Communication with me is only possible through Korean translation. The budget is $300 Please contact only those who can develop it right away according to your budget.

sns automatic upload Automatic upload to Instagram, YouTube, and blog How it works 1 Enter content image text on the website 2 Send content to the upload app 3 Automatically upload SNS Instagram, YouTube, TikTok, and blogs preset in the upload app Please contact only developers who can make it as quickly as possible in the shortest possible time. What you need to create: A website We need to create an app that can automatically upload to SNS from a phone. Communication with me is only possible through Korean translation. The budget is $300 Please contact only those who can develop it right away according to your budget.

I'm in need of a skilled React JS developer to handle front-end development for my project. The ideal candidate should have 2-5 years of experience in the f...years of experience in the field. Key Responsibilities: - Create and implement interactive elements - Ensure responsive design across mobile and desktop platforms - Develop necessary data visualization features Ideal Skills & Experience: - 2-5 years of experience in React JS development - Strong understanding of front-end development and UI/UX design - Proficiency in integrating front-end with backend systems Looking for a candidate who can contribute creativity, reliability, and a solid understanding of best practices in React JS development. This is a great opportunity for someone looking to apply their skills in...

If you are looking to double the GDP of your country with this project, look elsewhere. *New Freelancer welcome* Autobidder auto reject. The LMS requires usability and navigation basic redesign. Improvement in overall user experience. LMS needs interactive quizzes and assessments. Drip content. Registration and backend admin related to user registration need to be smooth out. Ensure student progress tracking and reporting features is active and working well. Will need expert to recommend other needed enhancements. Some custom coding required. Can buy plug-ins if it makes sense. Not possible to tell you everything that needs to be revamped and fixed. You will have to discover yourself and deliver a fully functioning LMS. Your services will be needed to maintain and keep LMS upto...

long term , full time flask developer needed to build ecommerce backend you should start right away should have proficiency in flask, jquery, ajax and mongodb budget INR 100 per hour, need to work for another 15 to 20 days

I am building an AI Inference Hub wher...Setup a login and register page using the supabase SDK that also allows users to register/login using third parties such as github, google, etc. - Prompt user to input billing info on register. Settings: - User page: - Design and create an intuitive page for users to edit their information - Tokens page: - Design a page for user to retrieve their API token - Billings page: - Create a backend using sveltekit to connect to the frontend. The billing page should include a list of invoices that have been charged to the user in a table. Users should be able to download the invoice and pay using midtrans SNAP. Billing system: - Create a Nodejs script that runs every 30 days and charges users according to the number of tokens they've u...

I'm in need of a skilled developer to create an Android application with ASP.NET C# backend and SQL SERVER database. Key Features: - The app should primarily function as an e-commerce platform, allowing users to browse through products and services. - I require the app to have a chat functionality where users can communicate with the sellers. - Users should also be able to leave reviews for products. Specific Chat Features: - The chat functionality should support text messaging, image sharing, and voice messages. Skills and Experience: - Proficiency in Android app development - Strong experience with ASP.NET C# and SQL SERVER - Previous experience in developing e-commerce apps - Proven track record in integrating chat functionalities within an app - Familiarity with implemen...

I'm looking to build a personal WordPress website th...SEO, it's not my primary focus. The key areas of this project are: - **Website Development**: - The site should be built on WordPress, with a strong emphasis on clean, user-friendly design and intuitive navigation. - I'd like to establish a structured content publication flow similar to that of Rankingbyseo.com. - **Content Management**: - The site should have a user-friendly backend for easy content management. - **Design**: - Aesthetics are important, so a knack for modern, appealing design will be a big plus. Ideal skills and experience for this project include: - Strong proficiency in WordPress development - Prior experience in developing content-heavy websites - A keen eye for modern...

...is new and we will do everything with an eye towards scalability). We will need links to social media sites. We are able to generate our own content but if you have experience as a content developer please include that information as well. As we add more services we will be planning on using your services in the future to expand the website. In addition to the above, I'd prefer to implement backend functionality to track customer info. Identifying where users are coming from is essential, and I'm open to suggestions for the best method, whether it be Google Analytics, a custom tracking code, or website referral links. I'd like this website to be functional for a business owner and not just geared towards patients. The ideal freelancer for this job would have ex...

Hello, I need a developer proficient in HTML, PHP (Symfony), and CSS to develop a website frontend& backend for a travel agency. Features: Homepage with featured promotions Login page (user management) Online reservations (hotel / car / omra) In the menu: List of hotels by region List of cars by brand Excursions Events A site similar to is desired. to be honest, im w developper, bad code not acceptable.

...where user can upload csv and view/download content generated from backend, chat with uploaded file (e.g. ) I need just one page, landing page will include a browser box to upload a file, no authentication, no payment integration. once file uploaded, it will be processed in the backend and result will be produced in tile format (e.g. ) user can view large formats of the result by clicking over it, download it from larg/tile format. type pinaki in caps in start of your proposal. you need to focus on fuctional stuff ignore everything else from ref. () site. Tech stack: technlogy: frontend => Angular/NodeJS/(or any other tech)+HTML5 Backend is being developed by some other team, so I want only front end

...network. The task will involve: - Diagnosing the current config issue and finding out why it's hindering deployment - Implement new configs to ensure the IoT devices and CCTV systems function correctly - Add functionalities to the website that include real-time monitoring of the devices, controlling and managing the devices remotely, and enabling data analytics and reporting. - Localize the existing backend and frontend design and contents as required to make the application as a template - Required to work with my other DevOps freelancer on my pc via anydesk Ideal Skills: - Experience with IoT Deployments: A solid understanding of IoT systems, including connectivity, device compatibility, and data security. - Proficiency in IP CCTV Systems: Knowledge of IP CCTV systems, th...

...Financial Management Module: This should cover budgeting, accounting, and financial reporting. - Inclusion of Inventory Management Module: This should track items in inventory, manage stock levels and generate reports. - Inclusion of Human Resources Management Module: This should cover employee tracking, payroll, benefits administration and other HR aspects. Skills and Expertise: - Proficient in backend and frontend web development - Proven experience in designing and developing ERP systems - Strong understanding of financial, inventory and HR management processes - Familiarity with security and user interface best practices - Ability to create intuitive, easy-to-use web interfaces. Please note: Multi-language functionality is not necessary for this project. I'm open to ...

- Edit scene model: 125 USD Night Render shots 30 each render: x 7 = 210 USD Total : 335 USD

I require a proficient Laravel expert who can make considerable improvements to my existing Laravel application. The selected freelancer will be responsible for: - Backend Development: Your skills should allow you to work efficiently on my application's backend, ensuring all new integrations are seamless. - Database Optimization: I am specifically looking for you to boost the performance of my existing application by optimizing the database, which includes indexing, query optimization, and normalization wherever necessary. - API Integration: Your experience integrating APIs will be crucial, as a key part of this project will involve utilizing various APIs to extend the functionality of the application. - User Interface Improvement: The right candidate will not solely...

...specializes in C# and can create a web application. The ideal candidate should be proficient in both the frontend and backend development. Key requirements: - Expertise in React.js, C# and ASP.NET for web-based applications - Proficient in frontend technologies like HTML, CSS, and JavaScript - Experience in backend development and databases - Ability to understand and implement software requirements - Strong problem-solving and analytical skills Your primary focus will be on developing the web application in C# to meet our business requirements. You'll need to ensure the application is high-performing and responsive, and you should be able to handle both the frontend and backend aspects of the project. The project will involve database integration, so experie...

I require a dedicated developer who can effectively create the backend logic for my college project; an E-commerce website. This site will primarily deal with physical products. Key Features Required: - E-commerce Capabilities: The site should facilitate the buying and selling of physical goods. Familiarity with creating product listings, shopping carts, and checkout procedures is a must. - Content Management System: I need a simple and efficient way to upload, remove or modify the products on the site. - Payment Gateway Integration: The website must securely process payments. Prior experience with integrating payment gateway services is required.

I'm in search of a talented Vue.js Fullstack Web Developer with expertise in Vue.js, JS, Vuetify to help create a responsive web application. Key Requirements: - Proficiency in JavaScript, HTML/CSS and Vue.js - Proven experience in building functional web applications ... Vuetify to help create a responsive web application. Key Requirements: - Proficiency in JavaScript, HTML/CSS and Vue.js - Proven experience in building functional web applications - Experiece with Vuetify and Design systems - Strong understanding of both frontend and backend development As the successful candidate, you'll be responsible for the following: - Collaborating with the design team to implement their mock-ups into a web application - Developing clean, maintainable and efficient code for both ...

We're developing a scanner app coupled with an query response system. Seeking a Flutter expert with Django knowledge for UI and backend development, respectively. The ideal candidate will excel in Flutter UI design and possess the skills to manage data storage in Django backend, along with handling API integrations seamlessly.

...customize my app further. Specifically: 1. **Focus of Training:** - Improving Frontend React Elements: During the training, I want to focus on amping up the frontend aspect of my React app. It's important for me to grasp how I can enrich the user interface, and add new features to enhance the app's functionality. - Integrating Python and React: I aim to learn in-depth understanding of how Python backend interacts with the React frontend, fostering a seamless integration. 2. **Ideal Trainer Qualification:** An experienced Python+React developer, having competency in teaching and excellent communication skills. A seasoned expert in User Interface design and feature development within React is crucial. This training will help me advance on the ongoing development o...

...multiple services used in accounts creation like facebook, instagram, gmail, whatsapp and other services.. This means we will be using physical sim cards, NOT virtual numbers. Web backend will need to communicate with physical hardware: (Moden huawei e303, 3131 FOR EXAMPLE) The system has to be the same as sms-activate, sms hub, sms pva, please if you have this experience I am searching for coders experienced is USSD/AT commands. Heavy experience with GSM/CDMA cellular networks and sms gateway integration. Look at the websites I've posted above, put together a compatible hardware list for the web frontend&backend that you can design, and let me know how long it will take you to create this. I need an accurate estimate of time to complete this project (+/-) what...

...be re-designed: 1. Home Page 2. Shop (list of products) 3. About 4. Product Page 5. Info page 1 6. Info page 2 7. Info page 3 8. Info page 4 9. Info page 5 10. Blog 11. Blog Post Page About: The website already exists, it is built in Wordpress with salient theme. I will provide detailed instruction like wireframes, colour palette, and artwork. It will be your job to work in the backend of Wordpress and salient to pull the design together. Ideal Skills: • Expert comprehension of WordPress and Salient Theme - Ability to follow design direction and achieve the look and feel outlined in the brief I provide. Project Timeline: • The project must be completed within a month. Please consider this timeline when making your bid. I'm looking forward...

I'm in need of a frontend developer with strong skills in Rea...to life and ensure its functionality. Key requirements: - Proficiency in React and TypeScript - Experience with Ant Design (Antd) and styled engine - Ability to develop a user-friendly, dynamic web application Responsibilities: - Refine existing design elements and implement new custom design features - Ensure a smooth user experience across all pages - Collaborate with backend developers to integrate frontend and backend solutions To apply, please send examples of your past work. Your portfolio should demonstrate your experience with frontend development and the technologies mentioned. The ideal freelancer for this project should be able to create some custom design elements, while working within a larg...

I'm in need of a skilled developer who can work proficiently with WordPress, HTML, CSS, and backend development, particularly in areas such as payment gateways. Key Requirements: - E-commerce Functionality: The website must support e-commerce capabilities, allowing for smooth and secure transactions. - Customizable Design: I'm looking for a website that can be easily tailored to suit different purposes or to accommodate various products or services. - Versatility: Your expertise should extend to being able to customize any kind of website, as my projects may vary in nature. Previous experience in similar projects is a definite advantage. If you're well-versed in the mentioned technologies and have a strong portfolio to back it up, I'd like to hear from you.

I'm looking for a skilled Magento developer to upgrade our c...themes, all of which would need to be compatible and functioning post-upgrade. Key Responsibilities: - Upgrade our Magento version from 2.4.1 to 2.4.4 - Ensure that all existing custom extensions and themes remain fully functional and compatible with the new version Ideal Skills and Experience: - Extensive experience with Magento stores and version upgrades - Proficient in both frontend and backend development - Strong understanding of custom extensions and theme management - Ability to troubleshoot and resolve compatibility issues Please note that data backup and migration are already handled, so the focus will be on the technical aspects of the upgrade. Please provide examples of similar projects you've wo...

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'm looking for a skilled fullstack developer with strong experience in NextJS and NestJS. The primary goal is to upgrade an existing website by adding new features. Overview We are expanding our system to handle domain names in addition to company names. This will involve modif...to reflect the new dual-capability of handling both company names and domains. Code Review: Organize code review sessions to ensure the new code adheres to project standards, is maintainable, and integrates smoothly with the existing codebase. Introduction to the code base will be given in order to accelerate understanding of the enhancements to be done across the two applications (Frontend & Backend) Glad to receive your offers and get an overview of your experience in the mentioned framework...

...project, ensuring the data structures are well-designed and functional. - Backend API Development: We have several third-party services which need to be integrated into our application through backend API Development. Along with the above responsibilities, we also need you to integrate certain features into our web application: - Payment Gateway Integration: This is crucial for enabling smooth transactions. Experience with such integrations will be beneficial. - API Integration: Our web application heavily relies on third-party services, and therefore, the ability to seamlessly integrate APIs is a must. Ideal candidates should have solid experience in Laravel web development, SQL database management, and backend API development. We're seeking someone who ...

I'm looking for a full-time PHP developer with expertise in Laravel and Symfony. The job will involve: - Backend Development: You will be responsible for building the backend of the project. - Database Management: Proficiency in database management is a must to handle project data effectively. - API Integration: You will be integrating various APIs into the project. The ideal candidate should have extensive experience in Laravel and Symfony. You should also be able to work full-time on the project. There is no strict deadline for this project.

I need an expert to develop a state-of-the-art vehicle tracking mob...state-of-the-art vehicle tracking mobile application that works on both iOS and Android platforms. While the core attribute of the app is vehicle tracking, there's potential requirement for backend server integration, although clarity on this will be determined as the project progresses. Ideal skills and experience: • Expertise in iOS and Android app development • Previous experience with vehicle tracking systems • Knowledge of backend server integration • Strong testing and debugging skills Your responsibilities: • Create a highly functional and user-friendly mobile app • Provide recommendations for backend integration, if necessary • Regular updates and bug...

I'm in need of an experienced Budibase developer to create a fare collection system with a PostgreSQL database backend. The system needs to be web-based and compatible with all major operating systems. Key functionalities and features include: - Ticket Purchasing: The system should allow customers to purchase tickets through a user-friendly interface. - Fare Calculation: It should have the capability to calculate fare based on distance, time, or any other parameters provided. - Payment Processing: The system will need to support secure and reliable payment processing for the purchased tickets. For this project, I need someone who is well-versed in Budibase development and has experience in creating similar fare collection or ticketing systems. A strong understanding of Postgr...

Only those freelancer bid who will be cost effective and bid amount will be final project amount as its starting of project only. I'm in need of a proficient flutter developer, capable of integrating user activity-focused push notifications into an application designed for both Android and iOS platforms. The specific notification type includes updates relating to new messages and followers. Ideal Skills & Experience: - Flutter Development - Experience with Push Notifications - Android & iOS App Development - UI/UX Artistic Sense Even though the target demographic was left unspecified, I'm looking for developers that can create a user-friendly interface that can efficiently deliver the intended notifications. This is a vital part of the project, as such, prior experience...

It will be a website for a no profit that offers services in the city. We well have, in this 6 pages, also blog and a page with shops that wants to affiliate. All controlled by Wordpress backend. I really like the look of this website and I would like to have it on mine

I am searching for a qualified HTML and Javascript developer who has prior experience in creating responsive gaming websites ( Frontend only required, NOAPI/BACKEND needed ). This personal website will have a design similar to a pre-existing site, with a fundamental focus on incorporating gaming elements into its interface. Key aspects to be developed will include: - Designing and coding the website, ensuring it's fully responsive and user-friendly with static features implemented meaning the games are work on the client side ( random values or whatever we just need a visual representation of everything )

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 have backend developer. We need only a professional Android developer who have knowledge on Android admin level api with remotely lock Android devices, unlock Android devices etc