Unity mobile joystick jobs

I am seeking a Unity game developer particularly skilled in multiplayer development for a player versus player (PvP) real-time web session game in the Runner genre. Your tasks would include: - Create full game from the beggining. The perfect freelancer for this project should have: - Advanced Unity game development skills (5+ years). - Proven experience specifically in real-time multiplayer game creation (2+ successfull projects). - Session games (execute server per each session [1vs1]) Good reference on what we will build -

I am developing 2 mobile applications using Flutter and Laravel. The main focus is on seamless functionality and user experience across both iOS and Android platforms. The perfect candidate for this task should: - Be skilled in both Flutter and Laravel - Have a track record of creating excellent mobile applications - Be adept at recognizing and incorporating optimal features for user engagement - Have experience in deploying apps for both iOS and Android

I am seeking an experienced mobile app developer capable of creating applications for both Android and iOS. to create an application that can pair to the Smart Band. especially Mi Band 6 and below. only takes sleep data.

...rugby in 1993. The storyline is based on the theme of "Team Unity and Camaraderie" emotional journey through adversity. Young men navigating the publics outcry at bringing in "imports" kids from outside suburbs and giving them a shot to play at an elite GPS private school aim to win their rugby union premiership on the schools 100th year all under the presence of a "Veteran Coach with Unconventional Methods". Here are some key requirements: - Writing style should successfully invoke emotion and propel an engaging narrative around Rugby. - The coach character is a major component, where his unconventional methods make him a dynamic and engaging figure. - The writer is encouraged to weave a powerful narrative around teamwork and unity. - Insig...

I'm seeking a proficient developer to design an all-inclusive mobile application for both Android and iOS platforms centered around booking and appointment scheduling. Key features: • Calendar Feature: Incorporation of a user-friendly calender for managing and scheduling appointments. • In-App Notification System: An alert system notifying users of upcoming appointments to ensure no important dates are missed. The ideal freelancer for this project should have • Extensive experience in app development on both iOS and Android platforms. • Excellent UX/UI design skills, making the application easy to navigate. • Robust knowledge in developing appointment booking systems and familiarity with push notifications. • Expertise in ensuring the app�...

I'm setting up a new enterprise, and I need a capable team to bring my concept of an innovative quiz and gaming mobile app to life. This app's target audience are users from all age groups so simplicity, attractiveness, and user-friendly design must be kept in mind. Key Features: - Innovative multiple-choice quizzes, appealing to all age groups. The ideal candidate should possess the following skills and experience: - Proficiency in both Android and iOS development - Experience in frontend and backend development - Strong skills in UI/UX design to effectively create an engaging and user-friendly environment. Only those with a comprehensive understanding of this project and the required skills need apply. Suggest your game-changing ideas in your proposals!

I'm in need of an expert in mobile application testing to ensure the functionality, performance, and compatibility of my app across iOS and Android platforms. Your role will involve: - Conducting thorough functional testing to identify any bugs or issues with the app's features and functionality. - Executing performance testing to ensure the app runs smoothly and efficiently on both iOS and Android devices. - Performing compatibility testing to guarantee my app works seamlessly across various devices and screen sizes. The project is extremely urgent, so I need someone who can start immediately and work efficiently to complete the testing as soon as possible. Ideal candidates should have: - A strong background in mobile app testing with significant experience on ...

I'm in need of a mobile application that integrates a Voice AI Chatbot along with a comprehensive membership system. Key Features: - Voice AI Chatbot: The app should have a voice AI chatbot to assist users with both task automation and information retrieval (e.g., weather updates). - Membership System: The application should have user registration, social media login, and subscription plan features. This is integral to offer exclusive services to our members. Ideal Skills & Experience: - Demonstrated experience in developing mobile applications with voice AI chatbots. - Proficiency in implementing membership systems with user registration, social media integration, and subscription plans. - Prior work on integrating push notifications into mobile apps. - St...

I am looking for an experienced mobile app developer who can create a mobile e-commerce application for both iOS and Android platforms. The primary goal of this app is to provide a seamless shopping experience for users who watch videos on the platform. Key Features: - The app should offer both product selling and video streaming functionalities. - The product selling section should include a robust product search feature. This is crucial for helping users find and purchase products they discover while watching videos. Ideal Skills: - Proficiency in mobile app development for both iOS and Android. - Previous experience in developing e-commerce apps, especially those with integrated video streaming capabilities. - Strong understanding of UI/UX design principles to cr...

I'm currently in the prototype development phase of a project that involves visualizing a game object on the Hololens 2. - I'm looking to enable Hololens 2 to visualize a game object that is also running on a PC. This PC is fetching data from an Arduino via the serial port. - The Arduino is collecting continuous data from...that is also running on a PC. This PC is fetching data from an Arduino via the serial port. - The Arduino is collecting continuous data from a potentiometer. The project aims for an interactive design visualization experience and I'm looking for a skilled developer to connect these different elements seamlessly. The use of Unity3D and Photon Unity Network is vital for this task. Experience with Hololens 2 development, Unity3D, Arduino, and Photon...

I'm looking for a knowledgeable freelancer who can create a mobile app on both Android and iOS platforms. Although I'm unsure about the specific functionalities needed at present, having experience with user authentication, in-app purchases, and real-time messaging will be highly beneficial. Your expertise and guidance will be highly appreciated in determining the key features necessary for a successful and user-friendly app. This project will require not only technical skills but also a creative problem-solving attitude. If you're up to the challenge, I'd love to discuss my project further with you.

Scope Document - “Turk’s Compass” Mobile App Development & Project Project Overview Project Name: “Turk’s Compass” Mobile App Development Project Budget: up to 500-1000 CAD Project Title: Project Abstract: Introducing "Turk’s Compass" – a ground-breaking Yellow Pages mobile app to serve as a “finder” for services/establishments and information. This mobile app should be released both on the Apple iOS and Google Android App Stores. Targeted audience of the application are: a) Entire Turkish community in Canada regardless of their city (Supporting major cities, such as Toronto, Montreal, Vancouver, Ottawa, London, Calgary, Regina) b) Anyone from Turkey wishing to immigrate to Canada. Pr...

I'm looking for a skilled mobile app developer to bring my vision to life. The project involves designing and developing a minimalist mobile app that will have the following features: - User Registration: The app should allow users to create an account and manage their personal information securely. - Push Notifications: Implement a system that allows for real-time notifications to be sent to users. - In-App Purchases: Integrate a purchasing system within the app that allows users to buy additional features or content. I'm particularly interested in a minimalist design for the app. Clean, straightforward, and user-friendly design elements are key to the success of this project. So, experience with creating such interfaces will be a big plus. If you have the right...

I'm in need of an experienced Google Play Console owner to help me with my mobile gaming app. Ideal Skills and Experience: - Extensive experience in publishing and managing mobile gaming apps on the Google Play Console. - Good understanding of the app store guidelines and requirements. - Ability to optimize app store listings for increased visibility and downloads. - Strong communication skills to discuss and negotiate offers. - Ability to provide guidance on improving the app. Looking forward to seeing the interested console developers. Please share your console link so we can discuss the offer further. Thank you.

I'm in search of a proficient freelancer who can develop a mobile app to be functional on both iOS and Android platforms. Since the primary function was not specified, creativity and ability to design multi-purpose apps will be highly appreciated. Key Requirements: - Strong experience in developing mobile apps for both iOS and Android - Proven experience in cross-platform mobile app development - Proficient coding skills in languages such as Swift, Kotlin, Objective C and Java - Exceptional UX/UI design skills - Strong problem-solving abilities, with a knack for complex troubleshooting tasks - Ability to work independently, with minimal supervision While delivering the final product, I'd also like you to provide the source code along with necessary doc...

This project primarily revolves around gathering information from various mobile phones. The specific details about the type of information, desired platform, and brands were not specified, thus inferring that I am open to all options. The main focus areas are as follows: 1. Phone Model retrieval 2. Operating system detection 3. Storage capacity assessment Ideal Skills: - Proficiency in Android and iOS platforms - Competent knowledge of various phone brands including Apple, Samsung, Huawei - Detailed understanding of mobile phone technical specifications - Excellent problem-solving skills, given the absence of specific guidelines in this project setting. Experience: - Minimum 2-3 years with mobile application development or a related field. - Prior experience ...

I need a highly professional, yet user-friendly e-commerce website developed using Magento open source, integrated with a mobile application built with Kotlin for Android and Swift for iOS. Key Aspects: - The main goal of this website and app is to sell physical products such as clothing, electronics and accessories online. - Both platforms must accept a variety of payment methods, including credit cards and PayPal, while also offering a cash on delivery option. Ideal Freelancer: - Extensive experience with Magento open source for e-commerce websites. - Proven proficiency in Kotlin for Android and Swift for iOS mobile app development. - Familiarity with incorporating diverse payment gateways. Your bid should clearly outline estimated timelines, proposed solutions and sim...

I'm looking for a talented artist to design a realistic cover for a song that reflects global situations. The work should encapsulate these key elements: - A globe or world map - Hands reaching out - Symbol of unity or harmony I envision an image that communicates a clear message about universal love and harmony. The artwork must not only match the song's theme but also enhance its message. Ideal candidates should have: - Proficient experience in realistic artwork - Expertise in symbolism, preferably related to global unity - A keen eye for detail to create a compelling song cover Please provide a portfolio of similar artwork along with your bid.

...audio elements of my upcoming mobile game. This project entails the creation of background music, character voices, and in-game sound effects. This game is being specially developed for the mobile platform. Key Responsibilities: - Develop and implement engaging background music that complements the gameplay - Create distinctive and suitable voiceovers for a small range of game characters - Design a variety of in-game sounds to heighten the player experience Ideal Skills and Experience: - Prior experience in creating audio for successful mobile games - Proficiency in using audio editing software and game development tools - Strong understanding of how sound complements gameplay - Ability to create high-quality voiceovers for multiple characters - A passion for m...

I am seeking out a skilled Unity AR developer who excels in creating location-based AR applications. The ideal candidate will have prior experience designing AR for navigation, showcasing points of interest, and developing virtual tours. Key requirements: - Development of a point of interest locating feature - Creation of animated route directions - Designing immersive virtual tours The ideal developers will have a strong understanding of AR principles, specifically location-based AR. Your relevant experience and previous projects showcasing these skills would be advantageous. Let's talk about time estimates once we discuss the full scope of the project.

I require a mobile crypto wallet for my existing business. The wallet is for a coin that's a fork of lite coin. I already have a UI design in place, but I need to add more features to it. The core functionality is already set up. Key Tasks: - Develop a mobile crypto wallet for my business - Use the existing UI design as a base and build upon it - Ensure the wallet supports multiple cryptocurrencies Ideal Freelancer: - Experienced in creating mobile crypto wallets - Proficient in working with lite coin forks - Skilled in UI design and development - Capable of integrating support for multiple cryptocurrencies into the wallet - Able to work on a project for an existing business and accommodate additions to the existing design

...conceptualize the layout and design both the inside and outside of a mobile sneaker merchandise store that doubles as a live streaming studio for the popular streamer Adin Ross. Key Features: - Customizable lighting system: The design should incorporate a customizable lighting system, to create a dynamic and engaging atmosphere. - Interactive product displays: The shelving for sneakers and clothing should be creatively backlit and interactive, to draw in customers. - Green screen backdrop: An area should be designed which can be used as a green screen for streaming and gaming, potentially with removable elements that incorporate lighting. Size and Dimensions: - The design should be inspired by the Tamara Mellon Mobile shoe store; please refer to this for size and layout...

I'm in need of a skilled UI/UX designer with experience in mobile app design for both iOS and Android platforms. The project involves designing a user-friendly and visually appealing mobile application. The primary objective of the app is to serve as a travel tech platform for travel planning and booking. Ideal Skills and Experience: - Proven experience in UI/UX design, specifically for mobile applications - Strong comprehension of design principles and user experience - Previous work on projects in the travel industry would be a significant advantage - Portfolio demonstrating successful and innovative mobile designs for iOS and Android - Ability to deliver high-quality, sleek, and intuitive designs - Good communication skills and understanding of client ...

...a skilled developer to enhance my existing website and develop mobile applications for both Android and iOS platforms. The ideal candidate should possess the following skills and experience: - Strong background in website and mobile applications development - Proficiency in implementing backend features such as User authentication, Database integration, and API integration - Capability to provide full control over the frontend of the website - Experience in implementing Commision Split extension - Ability to address existing website issues and improve its performance Your role will primarily involve: - Implementing requested backend features - Providing full control over the website's frontend - Designing and developing mobile applications for Android and iO...

Professional Enhancement of Desktop Wireframe and Mobile Design in Figma Overview: We're seeking a skilled Figma freelancer to transform our existing desktop wireframe into a professional and polished design. The current desktop wireframe has structural issues, poor typography, and inconsistent spacing, creating an unorganized layout. In addition, we need a mobile version that aligns with the newly enhanced desktop design. Your expertise will ensure both versions meet professional standards. Key Requirements: Figma Proficiency: - Advanced proficiency in Figma for wireframing and design. - Create visually appealing, interactive layouts using reusable components. - Implement a minimalist design system. Design Refinement: - Overhaul typography for better readability and c...

I'm in need of an expert mobile app developer with a keen eye for minimalist design. The task is very specific, revolving around the design of the UI/UX. The ideal candidate for this project should possess the following skills and experiences: - Proficient in creating minimalist UI/UX designs - Well-versed in Android app development - Ability to interpret user specifications accurately Design-wise, as stated above, I'm aiming for a minimalist aesthetic. Only those proficient in this style should apply. Your portfolio showcasing previous similar work will be highly crucial during the selection process. I look forward to your bid.

I need a talented mobile developer with a solid background in both Android and iOS platforms. Design and develop a user-friendly mobile app. Who can Implement features and functionalities based on project requirements. Ensure smooth performance and compatibility across various devices and screen sizes. Conduct thorough testing and debugging to identify and fix issues. Adhere to project timelines and deliverables. Please provide links to your portfolio or previous work.

We're in need of a skilled freelancer to tackle multiple tasks related to our website. Primarily, we require mobile optimisation to ensure our site is user-friendly and visually appealing on all devices. Additionally, there's a need to adjust pictures to fit seamlessly within the mobile layout without sacrificing quality. Moreover, there are some repairs needed on the website, such as fixing broken links, resolving layout issues, and addressing any other issues impacting functionality and user experience.

I need an expert in mobile-friendly design, specifically proficient in Wordpress's Divi Builder, to enhance the user experience of my website on mobile devices. It consists of one main page and two minor subpages. Freelancer should focus on: - Layout and Design: Create a minimalist design layout that aligns with the website's existing aesthetic. Knowledge in modern mobile-friendly techniques and trends is necessary. - Navigation and Menu: Ensure the website's navigation menu is accessible and user-friendly on mobile. This should include drop-down menus, links, and page transition. - Call-to-Action Buttons: Design and optimize touch-friendly call-to-action buttons, ensuring they are conveniently located and easy to engage with on mobile d...

I'm in need of a Unity developer with experience in creating platformer games. The core tasks will involve developing a 3D platformer game that uses the WASD keys where the main character defeats enemies and collects items. Key Requirements: - Proficiency in Unity and C# - Previous experience developing 3D platformer games - Ability to optimize game performance - Knowledge of creating intuitive game controls I have all the 3D assets for this game (files below), so i'm looking forward to working on this small game together. I'm hoping to get this done by the end of today or tomorrow morning since it is a tight deadline.

I am looking for a talented freelancer who can create a short, 6 second, unique video clip. The style should be abstract, minimalist, and potentially cartoonish. It should communicate a message of team support, encouragement, and specifically focus on team building activities along with positive feedback and re...building activities along with positive feedback and recognition. Ideal skills for this project include: - Experience in animation, preferably with an abstract or minimalistic style. - Proven record of creating engaging, meaningful short video clips. - Ability to translate a brief concept into a compelling visual piece. The aim of this video is to foster a driven team environment and promote unity. If you have the skills and passion to make this happen, please bid on thi...

I need a proficient mobile developer with a solid background in both Android and iOS platforms. This project will involve: - Implementing standard functionalities, such as: - User authentication. - Additionally, I am looking for edits to be made on the existing functionalities in the mobile application. - The add-on requirement for both the Android and iOS applications would be NFC services. Ideally, the mobile developer should have a proven portfolio in both Android and iOS development. Understanding and experience with NFC services are a must. The developer should also have good experience with debugging and improving existing code. Please ensure your bid reflects your experience and skills appropriately, and do include any relevant project samples with goog...

I am in search of seasoned mobile application developers who can help to design and publish a variety of small utility apps on Android and iOS. The apps required include, but not limited to: - To Do list - Stopwatch - Expense Tracker - Gallery Lock - Truth Or Dare Developers with competence in creating intuitive and user-friendly apps would be preferred. Your experience in developing utility apps will elevate your portfolio. Specific functions will be discussed in greater detail during the interview process. Ideal Skills: -Proficiency in Android & iOS application development -Demonstrated experience in creating utility-based mobile applications -Strong understanding of modern app design principles.

I'm looking for someone who can support me in a part-time job, focusing on typing and mobile app development tasks. The ideal freelancer should excel at: - Typing - fast and accurate, with great attention to detail. - Mobile App Development - expertise in building user-friendly interfaces, reliable coding, and ongoing app maintenance. These skills and experiences will help me earn money and ensure the project's success. The work schedule can be flexible, but it requires dedication and the ability to meet deadlines. Let's succeed together!

*** Please Read Before Messaging *** At this time I am just looking for quotes, if you are serious about this project please send me a direct message with a FULL quote. I will be making a more clear guideline to the app layout later on but for now here is the summary of what I am looking for: I want to build a completely virtual, 3D claw machine game. I will need a specific prize algorithm coded into the game so that the prizes don't spit out at random and we are able to control profit flow. The game will come with 10 free tokens for daily play, but will push sales of additional tokens to win prizes. The boxes in the claw machine will just be color coded boxes that align with the colors on the prize page. This game will need an admin panel, a user page, payment systems, an ED...

I'm looking for a skilled software developer with a focus on mobile app development. Key Requirements: - Experience in creating mobile apps, particularly in the finance or lending sector would be a significant plus. - Expertise in building user-friendly interfaces that are easy to navigate. - A deep understanding of security protocols is a must. - Knowledge of state-of-the-art software technologies and practices that help ensure the app's performance, security, and scalability. The primary objective of the mobile app is to provide a platform for digital lending. This means there are a few core functionalities that are essential: - Loan approval and disbursement: Users should be able to apply for loans via the app, and once approved, the loan should be dis...

I'm looking for a proficient developer to assist in creating a mobile application that will be supported on both Android and iOS. Key Points: - The application will be developed using TypeScript. - MongoDB will be utilized for data storage. - Mongoose will be used to interact with the MongoDB database. The ideal candidate should have extensive experience in mobile application development, MongoDB, TypeScript, and Mongoose. A strong understanding of Android and iOS platforms will be a significant advantage. I'm looking for a professional who can not only build the application but also provide valuable insights and suggestions to enhance its overall performance and functionality. I'm open to discussing further details and potential adjustments to this projec...

I need to develop a digital twin of a crane cabin for e-learning purposes, primarily for improving safety in crane operations in UNITY. This project ideally would be completed within a month. Your role will involve: - Creating an insightful, interactive, and realistic simulation of a crane cabin - All parts of the cabin shall be infividual 3D objects, as i need them for visual effects The ideal freelancer should: - Be an experienced 3D artist - Be able to deliver the project within a month or less.

I'm in need of a highly-skilled Unity 3D artist with a strong understanding of computer algorithms. The objective is to create an engaging educational video that accurately portrays sorting and searching algorithms. Ideal Skills: - Unity 3D and Visual Effects Creation - Advanced understanding of Computer Algorithms - Able to translate complex concepts to visual elements The successful bidder should have the ability to breakdown and simplify advanced level content, making it easy to understand even for novices. Knowledge in computer studies would greatly benefit the project. Your main task will be to represent sorting and searching algorithms effectively in 3D. Please provide any past samples that showcase your ability to visualize complex concepts in a simple manner...

I have a concept for a lifestyle-oriented mobile application but I'm looking for a skilled developer to help guide this concept into a functional, user-friendly app. The app should predominantly serve as a tool for daily lifestyle management, providing users with a variety of features to enhance their day-to-day life. Key Points: - The app's primary function is to support users with their daily routines. This could include features such as scheduling, reminders, health tracking, or lifestyle tips. - The focus of the app should be on usability and intuitive design. The user experience is crucial as the app should be easy to navigate and visually appealing. - I need the app completed within a month, so a developer who can efficiently manage their time and resources is ideal...

I am looking to create a feature-rich mobile app that seamlessly integrates with Instagram. Key features of the app would include: - Instagram Integration: The core requirement is to have the app connect with Instagram - leveraging the social media platform's functionalities and data. A profound understanding of mobile app development and experience with social media integrations, especially Instagram, is required. This knowledge will be crucial in developing an app that works seamlessly and takes full advantage of Instagram's features. I'd like to hear from developers who've done something similar.

design 3 screens mobile web design, figma will be provided

As a busy individual managing both personal and business activities, I am in need of assistance to streamline my contact management efficiently and accurately. Your task will focus on: - Adding both personal and business contacts to my database. - Ensuring the entry of crucial information: specifically, the name and phone number for each contact. To accomplish this task smoothly and efficiently, the following skills and experiences will be beneficial: - Proven experience with data entry tasks, specifically involving contacts management. - Expertise in database management, data input, and validation. - Detail-oriented and meticulous approach to handle large volumes of data. - Familiarity with digital tools for document scanning. - Proactive communication to clarify any ambiguities in sour...

...Swift development to design and create a mobile application for E-commerce purposes. Key requirements: - Develop a fully functional E-commerce mobile application using Swift. - Ensure the application is user-friendly and secure for online transactions. - Implement necessary features to support E-commerce functionalities like product browsing, cart management, payments, etc. Ideal skills and experience: - Proficiency in Swift is a must. - Prior experience in developing E-commerce applications is highly desirable. - Strong understanding of mobile app development principles and best practices. - Knowledge of UI/UX design and security standards in E-commerce. Kindly provide your portfolio or examples of your previous work in E-commerce and mobile app develo...

App Development: Collaborate with our team to develop a B2B Jewellery App for Android and iOS platforms. Admin Dashboard: Create a robust admin dashboard to manage sales, products, images, quantity, staff, notifications, categories, and other key aspects of the app. Gram-Based Transactions: Implement gram-based transactions, ensuring all products are sold in grams without the need for payment gateways. Product Variants: Enable sellers to list products with multiple variants and provide a seamless ordering experience for buyers. Security: Implement measures to restrict users from taking screenshots, ensuring the app's security and exclusivity.

We are looking for an experienced team of mobile app developers to build two mobile apps (Android and iOS) for a gold wholesale business. The app should allow registered users to log in and order products, while also providing inventory management and order tracking functionality. The app should also include a dashboard for the business owners to manage inventory and orders. In addition to the basic features, the app should also have a CRM system integrated into the dashboard, enabling the business owners to manage customer interactions and sales data. The CRM system should include lead tracking, sales forecasting, and customer segmentation, among other features. The project requires expertise in mobile app development, dashboard development, and CRM integration. The...

I'm in need of a skilled and experienced mobile app developer to build a comprehensive music player for both iOS and Android platforms for our youtube channel brainwave music Key Features Required: - Playlist Management: The app should allow users to create, edit, and manage their playlists effortlessly. - Offline Playback: A crucial feature will be the ability for users to listen to music offline, without requiring an active internet connection. - Equalizer: The app should include a built-in equalizer to enable users to customize their music playback experience. -API developement for downloading tracks from my server user secure google and facebook login home page spash with animation Ideal Candidate: - Proficient in mobile app development for both iOS and Android pl...

We are looking to develop four web applications, one of which has already been developed but requires updates. These apps will serve different purposes and will be linked to separate websites. The key requirements include integrating push notifications using OneSignal, incorporating standard splash screens and icons, implementing loading indicators for page transitions, and ensuring robust error handling for situations where there is no network connectivity. I will share a similar app for reference. Key Features: 1. Web App Development: Develop four web applications, each with distinct functionalities and linked to different websites. 2. Push Notifications: Integrate push notifications using OneSignal to enable real-time communication with users. 3. Splash Screens and Icons: Design and i...

I am looking to hire a PR and marketing guru to develop a detailed short-term marketing strategy for my iOS app in order to acquire my first users. Well Spotted! Is a safari and wildlife-spotting app. When a user goes on safari, especially in places like Africa (but really any place around the world where there is wildlife), they download the app and select the location they are going on safari. The app downloads a comprehensive list of all the wildlife available in that location. The total amount of wildlife that the app downloads for each location is in the range of about 500 different species. It also downloads extra information about the wildlife (from wikipedia) as well as multiple images for each wildlife that the user can look at. The app can be used entirely offline and the u...

Mobile App Redesign : a) UX/UI Enhancement b) Visual and Graphical Elements Improvement