Siphon video ios jobs

I'm in urgent need of a multiplayer strategy game app for both iOS and Android. Key Features: - The game should be focused on strategy gameplay, keeping players engaged and challenged. - The primary mode of the game should be multiplayer, enabling users to compete against each other in a strategic battle. Ideal Skills: - Expertise in game app development, particularly in strategy games. - Previous experience in developing multiplayer games. - Proficiency in both iOS and Android app development. - An ability to work under time constraints. Please, only reach out if you can meet the urgent timeline and have relevant experience. SERIOUS FREELANCER put at the top once you offer to me ..

I'm in need of a skilled video editor to help me bring my social media content to life. The video I need is less than 1 minute long, and requires advanced editing for color correction, audio adjustment, and effects. Key Requirements: - Proficiency in advanced video editing software and techniques - Prior experience in editing content specifically for social media - Ability to enhance video quality through color correction and audio adjustment - Capability to add engaging effects to make the video stand out Please get in touch if you have a strong portfolio that demonstrates your ability to fulfill these requirements. You can visit

I'm in need of a 1-minute product explainer video. The main goal of this video is to demonstrate the key features of my product. Target Audience: The video will primarily target everyday consumers. Tone: For the narration, I'm looking for a formal and informative style. Key Points: - The video will be 1 minute long - I will provide you with mobile and app screen shots - The narration needs to be formal and informative - The video should effectively demonstrate the product features - The primary target audience is everyday consumers Ideal skills and experience: - Proven track record of creating engaging and effective explainer videos - Exceptional skills in video editing - Ability to create clear and concise narrative content - Under...

I'm in need of a skilled 3D animator to create a captivating and entertaining animation video. The primary purpose of this video is for entertainment, so I'm looking for someone who can bring in creativity and artistic flair to their animation. Key requirements: - Proficient in 3D animation. - Experience in creating engaging and entertaining content. - Ability to work without the need for voice-over, relying solely on visual storytelling. Your task will be to create a visually appealing and captivating 3D animation that can engage the audience without the need for voice-over. The ideal candidate will have a strong portfolio of similar work and can demonstrate their ability to bring characters and scenes to life in an entertaining and engaging way.

I'm in need of a stellar video editor well-versed in crafting promotional videos with a cinematic style. Your editing expertise will transform raw footage into a compelling, dynamic video with: - The effective integration of special effects to make the video visually striking - Skillful syncing of background music to enhance the mood and message of the video Ideal candidates should have significant background in video editing, particularly in producing promotional content. Impress me with your knack for cinematic aesthetics and ability to incorporate sound and visuals that captivate our target audience.

We are looking for a native French person to transcribe a small 3 minutes long Canadian French video in French. We need the transcriptions in both .srt format and word document (you can copy paste from srt). Looking for someone who's experienced in French transcriptions and familiar with .srt subtitle format. New freelancers are welcome. Don't bid if you are not a native French speaker. Budget: 4 CAD fixed Need this to be done within 10 hours max after awarding the project. ***Don't bid if you are not happy with the price and deadline. Thank you!

I require a proficient Mandarin to English translator who can transform the content of my business video into English. This includes both generating subtitles that will be added on to the video and a separate transcript. The translator should ideally: - Be fluent in Mandarin and English - Have strong experience in business-related translations - Have a good grasp of translating Mandarin business terminology to English - Experience in adding subtitles to videos The video is in Mandarin and requires exact translation for business purposes. Accuracy is a priority due to the nature of the content.

As a social media content creator, I'm seeking a professional who can help me produce engaging video content for my brand's Instagram account. The content should be both entertaining and in line with my brand's overall aesthetic. The brand is fashion footwear, handbags, perfumes and accessories like jewellery and watches. Ideal candidates for this project should have: - Proven experience in creating video content for Instagram - A strong grasp of what makes content entertaining and engaging - Ability to understand and incorporate my brand's style and values into the videos I'm looking for someone who can work with me on an ongoing basis to create regular, high-quality video content that will resonate with my target audience. Experience with ...

I'm looking for a creative and experienced video creator who can produce a 8-12 minute Youtube video. The video will be aimed at a general audience, so it should be engaging and accessible for all ages. The main content of the video will be Bible quizzes, consisting of multiple choice questions. Skills and experience in the following areas are desired: - Video editing - Scriptwriting - Creating engaging and informative content for a general audience The ideal freelancer for this project will be able to produce a high-quality, professional video that is both entertaining and educational. Provide direct links to your work related to his project. !No links - no consideration and project will be removed from bids. Please don't ask me ...

As a travel enthusiast, I'm looking for a skilled video editor to bring my travels to life. I require someone to assist me in creating engaging and dynamic 5-10 minute travel videos across a range of themes including adventure, travel vlogs and destination highlights. Key Elements of the job: - Proficient in editing styles that are fast-paced and energetic - Experience in capturing the essence of various travel experiences - Skilled in creating short films, ideally in the 5-10 minute range - Comfortable with working on different travel themes (adventures, travel vlogs, destination highlights) A keen eye for detail and creativity is certainly a plus. Previous experience in travel video editing would make you stand out! I will be sharing the complete travel content sh...

...offensive language and so on. 2) You will compare the two statements and decide which one is a better answer to the question 3) You will provide a brief justification to your decision You are our perfect candidate if: - You are a native-level fluency in Japanese or have a C1 certificate of Japan - Your English proficiency is fluent - Your laptop meets requirements: RAM from 6 GB, Windows 10+ or iOS - You have stable internet connection - You are self-organised, can work without supervision Mindy Teams is an international outsourcing company, a European leader in the field of Data Annotation for Artificial Intelligence and Machine Learning for over 10 years. Several of our clients belong to GAFAM and Fortune500 lists. We have a team of 2000 professionals. We are waiting for y...

I am in need of a professional and experienced video editor who can highlight the amenities of various real estate properties in a cinematic style. This project will require: - Speed Ramping - Warp Stabilising - Good flow Experience in real estate video editing would be preferred. I am eager to provide further details and discuss your ideas on how we can show these properties in the best possible light. Project Pays $40-50 AUD per video.

I'm after a full-fledged mobile application for my dance studio, compatible with both iOS and Android platforms. More than just communication, this must provide an all-encompassing experience for our dance studio users. Key Features Needed: - 'Class Schedules Registration': users should easily view and register for our classes. - 'Dance Tutorial Videos': Let our audience enjoy video content of dance tutorials from our studio. - 'Chat Room': A communication platform for users to discuss dance classes, schedules, or general queries. - 'Booking Studio Space': We have 2 dance studios for rent, users should be able to book them through the app. Registration Process: We require users to register for classes: - An Enrollment Form with...

I'm seeking a talented developer to create an application where users can upload video reels. I need an artificial intelligence feature integrated into the app that can analyze these reels. Moreover, the AI should also be capable of scanning texts that users input and turn them into a document. The app needs to be monolingual and doesn't require support for multiple languages. The app will let users upload revision notes with a point system and have a dashboard of how long they've spent doing it. I want to eventually make it into an app which teachers, parents and students can use to check their childs activity and help others. i want a spot for brands to post student discounts and eventually earn commision off it the app sould also have a pro subscripion which has ac...

I am seeking a proficient Flutter developer to create an application for both iOS and Android platforms, with integral backend development using PHP/MySQL. Key Responsibilities: * Develop a Flutter app for both Android and iOS platforms. * Backend development of the app using PHP/MySQL. * Creation of Data fetching APIs for seamless user-experience. Ideal Skills: * Proficient in Flutter * Extensive experience with PHP/MySQL backend development * Skilled and knowledgeable in creating Data fetching APIs If you have proven experience in similar projects, I am willing to discuss the details further. Your understanding and expertise in Flutter development and API creation is paramount for this project.

I'm looking to hire a React Native developer. I need a cross-platform app for both iOS and Android. The main focus of the app will be property Booking related. It will need to handle transactions, product listings, and user profiles. Further, the app should be multi-lingual, so support for multiple languages is required. Requirements: - Proficient in React Native, with a good understanding of its core principles - Experience in building and deploying E-commerce applications - Familiarity with UI/UX design, to ensure a user-friendly experience - Ability to work with and implement multi-language support - Understanding of mobile app security best practices. Your prior work on similar projects and willingness to provide a portfolio will be highly regarded.

Hello, I'm looking for someone who could continue programming my iOS app and possibly fix any errors. This is actually a relatively simple app that shouldn't be very difficult to program. You don't have to do that much because the app is actually relatively simple. Key Responsibilities: - Addressing UI/UX, performance, and functional issues that may arise. - Implementing new features based on provided specifications. Ideal Freelancer: - Proven track record of iOS app development. - Proficiency in Swift and Xcode. - Experience with bug tracking tools. - Ability to translate user feedback into actionable development tasks.

I'm looking for a mobile app developer to create a cross-platform service app similar to URBAN CLAP. The app should be available on both Android and iOS devices. Key Features: - User Registration: Users should be able to create accounts and log in securely. - Service Provider Registration: A feature that allows service providers to register and offer their services on the app. - Service Booking: Users should be able to browse available services, select, and book them. - Payment Integration: A secure payment gateway should be implemented to facilitate transactions between users and service providers. Ideal Skills and Experience: - Proficient in cross-platform app development - Knowledge of creating user-friendly and engaging interfaces - Experience in integrating secure paymen...

I'm searching for an experienced animator, proficient in Gujarati language, to create a simple 2D animated video that runs for more than 2 minutes. Requirements: - Creativity: I don't possess a specific storyline or script, your creative input is needed here. - Animation Skills: You should be adept at simple 2D animation and be able to bring concepts to life. - Language Proficiency: You must be fluent in Gujarati as this is the language the animation will be targeted towards. By leveraging your 2D animation skills and language capabilities, we can create a captivating and engaging video ad. Looking forward to seeing your creative ideas!

I am in need of an experienced IOS app developer to create an app similar to AliExpress. The app will be a platform where sellers can showcase their products, and customers can purchase them using various payment methods. Key Features: - Development of an Android app with a user-friendly and intuitive interface - Functionality for sellers to create product listings - Integration of multiple payment gateways including Credit/Debit Cards, PayPal, and Mobile Wallets - Secure and reliable payment processing for customers - Ability for customers to browse, search, and purchase products - Notification system for order status updates - Shopping cart and checkout functionality Ideal Skills and Experience: - Proven experience in developing Android applications - Strong knowledge of mobile ...

I'm in search of a skilled professional to handle 360 video rendering of a few specific diamond shapes. Your task involves emphasizing the shape and brilliance of the diamond to achieve a shiny and clear effect. The video is currently in MOV format, which is your starting point. I attach example video of a normal diamond 360. Your task is to: 1. To receive a sketch of the Diamond from me. 2. Make a 3D render of the diamond 3. Create video just like the examples with shiny effects 4. Offer both Black & white background 5. Must look like real life video of a diamond and not clearly a fake render To make this project a success, possessing high-level skills in video editing software, such as Adobe Premiere Pro or After Effects, will be be...

I'm looking for a talented mobile app developer to create a comprehensive family tree mobile application. The app should be available on both iOS and Android platforms. The primary goal of the app is to enhance family communication and organization, so it will feature several key functionalities, including: - User registration and login - Family tree visualization - Photo upload and tagging - Entering details for individuals by Admin or other users with approval from Admin - Family News - Family Calendar - Admin Notifications and user notifications - Family Board data with accomplishments The app should have an intuitive and user-friendly interface, making it easy for all family members to interact with. Experience in developing similar applications, particularly those focu...

I'm looking for a skilled mobile app developer to create a versatile and user-friendly invitation app that can be used across multiple occasions including weddings, birthdays, and more. Primary Functions: - Sending digital invitations - Managing RSVPs Key Features: - Compatibility with both iOS and Android - Advanced level of customization for the invitations (custom designs and layout) Ideal Skills: - Proficiency in mobile app development for both iOS and Android platforms - Experience in developing apps with complex user interfaces for high customization - Knowledge of managing user data and RSVP systems - UI/UX design experience to ensure a seamless user experience - A keen eye for detail and the ability to achieve a polished final product If you have the require...

I am seeking a skilled graphic designer with sufficient experience in logo design to create a unique and attractive logo for my business that captures our brand identity, attracts our target audience, and sets us apart from our competitors. I expect: • Showcasing of your past experience relevant to logo design • Demonstration of creative thinking and original design ideas • Understanding of modern design trends and aesthetics Skills Needed: • Proficient in Adobe Illustrator or similar design software • Strong portfolio demonstrating design skills • Creativity and ability to implement brand personality into design • Understanding of target audience and market trends.

We are looking for a native French person to transcribe a small 3 minutes long Canadian French video in French. We need the transcriptions in both .srt format and word document (you can copy paste from srt). Looking for someone who's experienced in French transcriptions and familiar with .srt subtitle format. New freelancers are welcome. Don't bid if you are not a native French speaker. Budget: 4 CAD fixed Need this to be done within 10 hours max after awarding the project. ***Don't bid if you are not happy with the price and deadline. Thank you!

I'm looking for a seasoned Python developer with specific experience in image especially video analysis to create a script that can process a full mp4 video and identify the positions of noise in the video. The idea is to scan the video, locate identify the different type of noises and their value and externalize this findings into a json file Key Requirements: - The script (OOP based) should be able to read a video in mp4, mkv, mov format. - The library used for reading the video is not fixed. You can choose from libraries like (e.g. OpenCV, PyAV, or MoviePy, but the solution should be compatible with both Windows and Linux (and mac) - The output should have details of the signal, the different type noises, the common ratios and finally the...

...functions similar to Instagram. The app should be compatible with both Android and iOS systems. Key features of the project should include: - Video sharing capabilities - Creation of user profiles - Various filters and editing tools for enhanced media uploading experience - Seamless social media integration for easy login and registration and Data fetching As for the user interactions, I'd like a direct messaging system for the users to communicate and an option for them to save their favorite posts. People should also be able to view posts they've liked in the past. The ideal person for this job should have extensive experience in mobile app development, particularly with social media applications and video streaming service. Social media integration...

I am on the hunt for a proficient Flutter developer experienced in enha...send Cv to the admin before proivider start work ( the current process is that the provider signs up then admin confirms him then he uploads document but i want it so that he sends documents when doing the sign up. Ideal candidates should have: - A deep understanding of Flutter development - Familiarity with Laravel websites - Proven ability at creating stunning, user-friendly interfaces on both IOS and Android platforms While applying, please share the past work you've done that’s specifically relevant to this role. I would like to review your previous work to assess your suitability for this project. If your track record shows you can handle these tasks, we should talk further. Looking forward t...

Hey, I'm looking for video editors who can edit videos like Natt Jongsala and Devin Jatho. Duration 60 seconds. Budget $7 per video. Don't bid if you can't work within this price. 50-100 videos per month

I need a skilled mobile app developer, experienced in creating dynamic, user-friendly social networking apps. The main foc...individual chats interactions: - User Profiles: Develop a feature that allows users to create and manage attractive user profiles. Experience in designing user profiles for other social networking apps would be advantageous. - Messaging: Mainly, the app should support individual chats. Your expertise in integrating seamless, bug-free messaging functionality would be desirable. Your knowledge of both iOS and Android app development is critical for the successful completion of this project. So, ensure you can translate an app concept into a high-quality, user-friendly interface. Please bid if you can turn my innovative social networking app idea from vision t...

I'm in need of an experienced and creative mobile app developer to craft an innovative ...social media accounts - In-app messaging, enabling users to communicate with each other within the app - Push notifications, informing users about important updates or messages even when they are not actively using the app Timing is crucial for this project as I'm looking to have it completed within a month. Ideal candidates should have: - Proven experience in mobile app development for both iOS and Android platforms - Friendliness towards tight deadlines - Proficiency in creating user-centric designs and functionalities - The ability to translate app concepts into high-quality mobile applications. I'm excited to work with a developer who can bring my idea to life and delive...

I'm in need of a professional who live in US to shoot and produce an advertisement video. The main purpose of this video is to showcase a new product. This product showcase video should be engaging and attractive, conveying the key features and benefits of the product to potential customers. Key Requirements: - The video should be in a narrative style. Ideal Skills and Experience: - Experience with product showcase videos is a must. - A strong portfolio of video production work. - Ability to craft compelling narratives. - Experience in creating advertisements would be a plus. I'm looking for a professional who can bring creativity and expertise to this project. If you think you are the right fit, please reach out.

I need a freelancer to transcribe an English video that's between 10-30 minutes long. Additionally, I require the audio to be extracted and edited to improve its quality. Ideal Skills and Experience: - Proficiency in English to transcribe the video accurately. - Experience with audio editing to enhance the MP3's quality.

Require an ecommerce shopping site and Android and iOS app

I'm looking for an experienced scriptwriter to collaborate on creating engaging, inspirational video content for my YouTube channel. The main focus of the scripts will be on the motivational genre, with topics covering Success and goal setting, Overcoming obstacles, Personal development, and business case studies. Key deliverables and requirements include: - Creating 5-10 minutes long scripts for each video - Ensuring the content is engaging, inspirational, and aligned with the motivational theme - Researching and incorporating insights related to success, goal setting, personal development, and business case studies into the scripts. Ideal candidates should have: - Proven experience in scriptwriting for YouTube, preferably within the motivational or self-improvement ...

...professional app developer to bring my vision to life. The platform should be available on both iOS and Android. Key Features: - Messaging: A secure, user-friendly messaging system is essential for users to communicate effectively. - Profile Customization: The ability for users to personalize their profiles with images, information and preferences is key for building a social identity. - Friend Request System: A seamless system for users to connect with others is crucial. It's important that both existing and new connections can be made with ease. Skills and Experience: - Demonstrable experience in developing and launching social apps, with a portfolio showcasing your work. - Proficient with both iOS and Android development, ensuring the app is optimized and functio...

I'm in search of a video editor well-versed in handling key aspects of post-production work for my YouTube channel that features regular challenging videos. These videos are typically above 10 minutes long. Needs: • Adept at meticulously cutting and trimming videos. • Skilled in adding relevant transitions and effects that complement and enhance the video content. • Good eye for color correction and grading, ensuring visuals are both appealing and consistent. Ideal Skills: • Proficient in using popular video editing software. • Prior experience with editing YouTube videos, especially in dealing with complex content. • Attuned to the dynamic nature of challenging videos and capable of bringing out their essence through edits.

I'm seeking an innovative and experienced video producer to create a 1-3 minutes long music video. Key Details: - The music genre is Rap/Hip-Hop. - The video's theme is performance-based, requiring a keen eye for capturing the energy and dynamics of the performance. Ideal Freelancer: - Extensive experience in creating music videos, particularly in the Rap/Hip-Hop genre. - Proficiency in creative editing software such as Adobe Premiere Pro or Final Cut Pro. - Possess a creative eye for capturing engaging performance shots. - Strong commitment to deadlines. The goal is to create a video that matches the energy of the wong, emphasizes the performance, and engages the viewers. If you have a solid portfolio in creating performance-based music videos, I wou...

I'm in need of an experienced Flutter Developer who can design an application compatible with both Android and iOS platforms. Key features I'm looking to integrate are: - User Authentication - In-App Purchases At this stage, the requirements for SDK integration are open-ended as this question was skipped previously. Please recommend a suitable option you are comfortable with from the following choices: Firebase, AWS, Google Cloud, etc. Familiarity with Playstore submissions is also a must, ensuring a smooth transition from development to publishing. An ideal candidate for this role would have a solid record of creating Flutter applications for a variety of platforms, along with implementing the features listed above. Your techno-functional expertise would be crucial...

...net/ maui package similar to with same functionality but with support for iOS in addition to existing platforms. Please don't ask for further details before you checked the package's page. Requirements: - the package must be able to Convert PDFs into images (save the whole pages to images, not just export existing images on pdf); - the package must provide iOS compatibility; - the package must provide a parameter to specify jpeg compression level and preserve colors; - the package must be developed in c#, compliant with .net/.net framework/Mono and ready to be used in windows/ maui ios & android projects; - the developer must provide c#, not hardcoded and fully commented source code; - the developer can't use

I need a React Native developer to write a code that enables an uninstallation approval feature on both iOS and Android platforms. This feature should prompt a request for uninstallation permission whenever a user wants to uninstall the app. This request is sent to the admin for approval or rejection. The entire approval process must be handled within the app itself. Key Competency Areas: - Proficiency in React Native development - Familiarity with iOS and Android platforms - Experience with creating in-app prompts and notifications - Ability to create admin-controlled features within an app - Strong attention to detail and quality of code. Please submit your bid along with any similar projects you've completed. Prior experience with similar fea...

I need a proficient video editor who can deliver professional editing. This includes aspects of storytelling, advanced color grading, and sound design. The result I'm aiming for is a personal use video in a vlog style. Required expertise: - Advanced video editing skills - Familiar with vlog style editing - Proficient in storytelling, color grading, and sound design Ideally, you'll have a portfolio of vlogs or similar style videos that you've edited in the past. I'm looking forward to seeing how you can turn my footage into a coherent and engaging personal video.

...am looking for a proficient Unity developer who can efficiently handle asset delivery on both Android and iOS platforms. The main focus will be on Play Asset Delivery (on demand). Experience in this aspect is crucial as it forms a large part of the project. Additionally, knowledge and skills in iOS on-demand resources are vital too. An essential task will be delivering documentation on implementation. Therefore, first-rate communication skills, attention to detail, and a solid understanding of technical writing are key for this role. Ideal Skills: - Proven experience working with Unity on Android and iOS platforms - Proficiency in Play Asset Delivery (on demand) - Experience with iOS on-demand resources - Excellent technical writing and communication ski...

I'm seeking a knowledgeable professional to create an engaging, high-quality video course about technology. The course should be tailored to fit learners who already grasp the basic principles of software development and technology are prepared to move into more intermediate techniques and principles. Course Content • Put emphasis on practical applications and live coding examples to reinforce theoretical concepts. • The course should also cover key software development areas such as code writing and debugging, system design, and software testing. • The content should be geared towards an intermediate understanding, hence prior experience in teaching or tutoring at this level would be beneficial. Certifications and Skills Needed • Test-driven developme...

I'm seeking a highly skilled iOS developer who specializes in Moodle app customization. Your task is to conduct a seamless setup of the Moodle app on my machine, ensuring it operates flawlessly on the iOS simulator. Your responsibilities include: - Understanding my requirements and applying basic customization to the app: including the logo, color scheme, and fonts. - The version of Moodle in my current use: Moodle 3.2 Given that I have a strict deadline for the project, proven experience in Moodle app customization, and the ability to meet deadlines, is strongly preferred. Your ability to communicate clearly and promptly is also critical for the success of this project, so I'm looking forward to proper problem-solving discussions if they arise.

...skilled professional to assist with my video project, which is centered around the creation of promotional content. Key Tasks Include: - Video Editing: You'll be responsible for polishing and enhancing the raw video footage. This includes tasks like trimming, adding transitions, and ensuring a high-quality final product. - Script Writing: Crafting engaging, persuasive, and informative scripts that perfectly complement the video content. - Transcription: Converting the audio content of the videos into written form. My primary goal with this project is to create compelling promotional content that captivates and engages the target audience. Ideal candidate for this project should: - Have prior experience in content creation, with a focus on video...

I am looking for a versatile developer to create an ecommerce application that will run on both iOS and Android. The application must include the following features: - Facilitate user registration and profile management - Allow product listing and search capabilities - Include a functional shopping cart and checkout process An imperative aspect of this project is the integration of external payment gateways to support the checkout process. It's therefore essential for the ideal candidate to have previous experience with payment gateway integration. The ability to cross-code for both Android and iOS platforms is essential due to the dual-platform nature of this app.

I am looking for: - An expert Swift/Kotlin developer with in-depth understanding of the Mobile App Development, as well as Firebase. - The app will be developed for both iOS and Android platform. - I have a Figma design and DB structure. - You should be an individual reliable/honest developer. Agencies will be declined automatically. - You need to sign a NDA to get started. - If you're proficient with all these specifications, you could well be the professional I'm looking for.

...used. But you have to put it together in a beautiful looking website. Logo and color theme is also final. The website will have following pages: Home Page Mobile App - we have a mobile app on google play store, we want to give complete information about the app, key features, faqs, pricing, direct user to google play store. We will be launching the iOS version shortly so the design must factor in both, with option to enable the iOS related content later on. Product Development Services About Us Blogs - this should use the CMS in framer Blog Articles The website must be responsive and work well on mobile also. You will have to complete the design on the framer project we will add you to, you will also have to provide images/illustrations/videos/any asset needed to com...

I'm currently in need of a hotel booking module to be developed for both Android and iOS platforms using Flutter. Key Functionalities: - User Registration: The module should allow users to create accounts and log in securely. - Hotel Search and Filtering: It should provide users with the ability to search for hotels and filter results based on various criteria like price, location, and amenities. - Booking Confirmation: Once a user selects a hotel and submits booking details, the module should display a confirmation message. Skills and Experience: - Proficiency in Flutter for cross-platform mobile app development. - Experience with user registration and authentication systems