Ruby on rails developer london jobs

I need a skilled developer to create a social networking mobile app tailored to the Saudi exchange market, "Tadawul", similar to Stocktwits. Key Features: - Real-time financial data: Users should be able to view real-time stock prices and receive market news updates. - Social Networking: The app must include user profiles, posting and commenting features. - User Engagement: Incorporate features like notifications, a follow/unfollow system, and the ability to like and share posts. The ideal candidate for this project should have: - Proven experience in developing apps that blend real-time financial data with social networking features. - A solid track record of creating user-friendly mobile apps for both IOS and Android. - UI/UX design skills, with the ability to make the...

I have a licensed Tally installation on an AWS EC2 Windows instance. There are 7 Tally users within our organization, and I need each Tally user to be restricted so they can only access Tally from one specific laptop/PC. Even if they connect via our VPN, they should not be able to log in from any other device. Key Requirements: Tally Environment: Already installed on an AWS EC2 Windows Server, with 7 Tally users. Device-Specific Restriction: Each Tally user must be permitted to log in only from their assigned device. VPN in Use: We have an AWS VPN connection. If a user tries to connect through the VPN from an unapproved device, it must deny Tally access. Possible Approaches: VPN certificate/device binding Windows account / RDP restrictions Firewall rules / IP-based restricti...

I'm seeking an experienced Snowflake plugin developer to create a plugin with a primary focus on analytics and reporting capabilities. Key Features: - The plugin should be able to visualize data in various forms including counts, statistics, change data capture (cdc), data quality assessments, and data anomalies. - It should provide a range of data visualizations such as dashboards, charts, and interactive reports. - The plugin will primarily interact with Snowflake as the data source. Ideal Skills: - Proven experience in developing Snowflake plugins. - Strong knowledge in data analytics and reporting. - Proficiency in creating various data visualizations. - Familiarity with Snowflake as a data source. - Ability to create interactive and user-friendly plugins.

...reboots. This issue does not happen on Windows, only on Linux. I have tried both PulseAudio and PipeWire, but neither has fixed the issue. I suspect there could be a conflict with the audio drivers, kernel, or some hardware-related issue. I need an experienced Arch Linux/ArcoLinux expert who can: Diagnose and fix the issue causing system reboots when playing audio Ensure that sound works properly without crashes (YouTube, VLC, etc.) Identify whether it’s a driver, kernel, or hardware-related problem Provide a clear explanation of the fix ? Requirements: Expertise in Arch Linux & ArcoLinux Strong understanding of Linux audio subsystems (ALSA, PulseAudio, PipeWire) Experience troubleshooting AMD Ryzen 5 5600G-related issues ...

I'm in need of a Python expert who can maintain my web scraping code. The code is currently set up to collect data from various news websites on a daily basis. Key Responsibilities: - Ensuring the scraping code runs smoothly and efficiently every day. - Troubleshooting any issues that arise with the code or the websites being scraped. - Implementing updates to the code as needed, such as changes in website structure or scraping requirements. Ideal Skills: - Strong Python programming skills. - Experience with web scraping, particularly from news sites. - Problem-solving skills for troubleshooting code issues. - Ability to adapt to changes in website structures. Your expertise will help ensure consistent and reliable data collection from these news sites.

## Project Overview Need a Python developer to backtest an existing gap trading model on SPY data. The model predicts gap fills using logistic regression. Model code will be provided. ## Required Deliverables ### 1. Data Collection - Pull 5 years of SPY daily data using Interactive Brokers API - Required fields: Date, Open, High, Low, Close, Pre-market data - Focus only on SPY (no other symbols needed) ### 2. Backtesting Implementation - Use provided logistic regression model - Test on 5 years of historical data - Basic entry rules: - Enter when model predicts high probability of gap fill - Exit when gap fills or at market close - Track simple P&L ### 3. Performance Metrics Provide CSV report with: - Win/Loss ratio - Average prof...

...product and appeal to our target audience. Contest Requirements 1. *Label Design*: Create a unique and eye-catching label design for our Indian Healing Clay product. 2. *Color Scheme*: Use a natural and earthy color scheme that reflects the healing properties of our product. 3. *Logo*: Incorporate our existing logo into the design. 4. *Product Information*: Include the following product information on the label: - Product name: Indian Healing Clay - Tagline: Deep Skin & Pore Cleansing! - Ingredients: refer to product name: Mayan Magic Mud - Instructions for use: Refer to Product : Mayan Magic Mud - Label size : w- 268 mm h- 63 mm 5. *File Formats*: Submit your design in the following formats: - Vector (AI or EPS) - Raster (JPEG or PNG) - once label ...

I'm in the process of creating a documentary with a focus on social issues, primarily homelessness, and how it intersects with vacant office buildings in London. Key Responsibilities: - Research on vacant office buildings in London - Identify potential investment opportunities within these buildings - Provide insights into urban development planning and market analysis - Assist in highlighting the intersection of these themes with social issues, particularly homelessness Ideal Skills and Experience: - Background in urban planning, real estate, or social sciences - Experience in market analysis - Understanding of the issue of homelessness - Prior experience with research for documentary production is a plus - Excellent written and verbal communication skil...

We're seeking a skilled Node.js developer to enhance our current application by integrating OpenAI functionalities. The ideal candidate will have experience in optimizing existing code, implementing new features, and ensuring seamless integration with OpenAI's API. Your contributions will directly impact our application's performance and user experience. If you have experience about AI and have a strong background in Node.js, we would like to hear from you! NOTE: When you bid, include your experience . Best regard.

We are looking for a freelancer to help build a blog focused on self-development and personal growth. The blog will share practical tips on improving self-confidence, generating passive income, and enhancing personal organization. Additionally, there’s an interest in exploring print-on-demand products that complement these themes.

I'm looking for a professional with expertise in ANSYS to perform an elastic bending simulation on a copper wire. The key deliverable from this project is a detailed analysis of the stress distribution throughout the wire during the bending process. Ideal skills for this project include: - Proficiency in ANSYS software - Experience with elastic bending simulations - Ability to analyze and interpret stress distribution data - Proficiency in Finite Element Analysis (FEA) Please include relevant past work in your proposal. Thank you!

We need a write script for purchasing items on website, with out design, just script

I'm looking for an experienced AI developer with a strong background in predictive analytics, particularly in the healthcare sector. The project involves creating a predictive analytics model based on self-assessment and diagnosis data. Ideal Skills: - Extensive experience in AI and predictive analytics - Deep understanding of the healthcare industry - Proficiency in handling and interpreting self-assessment and diagnosis data - Strong programming skills Key Responsibilities: - Develop a predictive analytics model - Ensure the model is tailored for the healthcare industry - Deliver a solution that can handle self-assessment and diagnosis data Your expertise will help us leverage this data to improve patient outcomes and healthcare delivery.

I'm seeking a skilled developer for a neobank system with robust fraud prevention features. Key Requirements: - The system should include an identification ID and selfie functionality. This will be pivotal for user verification and primarily for fraud prevention purposes. - The system needs to incorporate biometric verification and document verification as part of its fraud prevention features. - The ability to manage customer accounts, process payments and conduct financial analytics is also essential. Ideal Skills: - Proficiency in developing secure and efficient neobank systems. - Experience with implementing biometric and document verification systems. - Familiarity with customer account management, payment processing and financial analytics features. - Strong understand...

I'm in urgent need of a local IT expert to come to my home office in Thousand Oaks, CA. We're experiencing serious Outlook 365 issues that are beyond our capacity to fix. Cu...backup issues. This is critically impacting our business, as email is vital for us. I've tried addressing these issues remotely, but to no avail. We may need new hardware or software, but preserving our emails is the utmost priority. The ideal freelancer for this project should: - Be a local IT expert with in-depth knowledge of Outlook 365 - Be able to diagnose and fix the current issues on-site - Provide recommendations for hardware or software updates if necessary - Ensure that our emails are preserved and accessible Please reach out if you believe you can assist us in this ...

I'm looking to establish a minimalist-themed online store on Shopify and Etsy, selling digital products. Skills & Experience: - Proven expertise in Shopify and Etsy store setup is essential. - Strong understanding of digital product sales. - Previous experience with minimalist design implementations on e-commerce platforms is a plus. - Knowledge of SEO and digital marketing strategies will be beneficial.

We are seeking an experienced and highly skilled Senior Laravel PHP Developer with strong frontend development expertise to join our dynamic team. The ideal candidate will have over five years of experience in developing robust and scalable web applications using Laravel and must be proficient in frontend technologies such as HTML, CSS, JavaScript, and modern frameworks like Vue.js or React. Responsibilities: Design, develop, and maintain high-performance web applications using Laravel. Collaborate with frontend developers to integrate user-facing elements with server-side logic. Optimize applications for maximum performance, scalability, and security. Troubleshoot, debug, and resolve software defects and issues. Develop and maintain database structures using MySQL or PostgreS...

My primary goal for this project is to increase the traffic to my website. I'm particularly focused on optimizing my landing pages through effective on-page SEO techniques. Ideal Skills and Experience: - Proven track record in SEO, specifically on-page SEO - Experience in optimizing landing pages for traffic - Proficient in keyword usage and content optimization - Knowledge of current SEO trends and algorithms.

I'm in need of a proficient frontend developer who can translate our new Figma design into our SaaS platform with a strong emphasis on implementing a pixel-perfect UI, particularly for the user dashboard. The project involves working with React, ensuring responsive design and smooth functionality. Key Responsibilities: - Implement Figma designs into our SaaS platform - Focus on creating a pixel-perfect UI for the user dashboard - Ensure responsive design and smooth functionality Skills and Experience Needed: - Strong proficiency in React - Prior experience with implementing Figma designs - Experience with creating responsive designs - Familiarity with API integration Please note that while some API endpoints are ready, not all have been developed yet. Therefor...

More details: Is this project for business or personal use? For an existing business What information should successful freelancers include in their application? Detailed project proposals How soon do you need your project completed? ASAP The campaign will target the entire nation. Assistance with pr...campaign will target the entire nation. Assistance with product listings and descriptions is required. No product photography assistance is required. No additional marketing strategies are required. Inventory management integration assistance is not required. The project will involve listing 1-50 products. All necessary product details and images will be provided. You will use existing accounts on Flipkart and Amazon. Assistance with optimizing the listings for search rankings is...

We are seeking an experienced freelance AI Developer to lead the design, development, and deployment of innovative AI-powered applications. The ideal candidate will have a strong background in Large Language Models (LLMs), generative AI (GenAI), and retrieval-augmented generation (RAG) techniques. You will work closely with our team to build applications that leverage advanced AI methodologies to deliver transformative user experiences. Key Responsibilities: Design & Architecture: Develop scalable AI application architectures incorporating LLMs, generative models, and RAG strategies. Define system requirements and integrate AI components with existing platforms. Development & Integration: Build, test, and deploy AI modules for natural language understanding, generation, ...

I'm in need of a Java developer who can create a user data form for me. This form should be capable of collecting various types of user data, including both string and integer data. The form should also be able to generate a report based on the collected data. Key Requirements: - The form should be able to collect 'user data' which includes personal, employment and education details. - The report should be generated within a time frame of 20 days. - The budget for this project is fixed at 7k to 9k. Ideal Skills: - Proficiency in Java - Experience in developing data collection forms - Ability to create reporting features within applications - Strong understanding of user data privacy and security measures.

I'm seeking a dedicated SEO professional to enhance my business's online presence through strategic on-page SEO. Key Focus Areas: - Keyword Optimization: Help me identify and implement the most effective keywords for my industry. - Content Quality: Assess and improve the quality of my current content to boost engagement and ranking. - Meta Tags and Descriptions: Optimize all meta tags and descriptions for maximum visibility and click-through rates. Skills and Experience Required: - Proven experience in on-page SEO. - Exceptional content creation and editing skills. - In-depth knowledge of keyword research techniques. - Familiarity with SEO tools and software. Your expertise will be crucial in assisting me with keyword research and implementing these strategies ef...

PHP Developer with strong frontend development expertise to join our dynamic team. The ideal candidate will have over five years of experience in developing robust and scalable web applications using Laravel and must be proficient in frontend technologies such as HTML, CSS, JavaScript, and modern frameworks like Vue.js or React. Responsibilities: Design, develop, and maintain high-performance web applications using Laravel. Collaborate with frontend developers to integrate user-facing elements with server-side logic. Optimize applications for maximum performance, scalability, and security. Troubleshoot, debug, and resolve software defects and issues. Develop and maintain database structures using MySQL or PostgreSQL. Write clean, well-documented, and maintainable code followi...

I'm seeking a skilled .NET developer to integrate an API service with our .NET software. The integration will involve multiple functionalities, including data retrieval, data submission, and handling authentication and authorization. Key Responsibilities: - Integrate an API service with our .NET software - Implement functionalities for data retrieval and data submission - Set up and manage authentication and authorization processes Skills and Experience: - Proficiency in .NET development - Extensive experience with API integration - Strong understanding of authentication and authorization mechanisms - Excellent problem-solving skills and attention to detail

We are looking for a detail-oriented Content Writer to create 6 weekly blog posts (800-1000 words) on the benefits of Mastic Gum. Topics include digestive health, oral care, and anti-inflammatory properties, with research-backed claims. Each article should be SEO-optimized, error-free, and engaging. Payment is AUD $15 per article. Articles must be original, with no plagiarism.

...MicroPython running on an ESP32 microchip. - You do *not* need any experience with microcontrollers, electronics, electrical engineering, mechatronics, Arduino, PCB, circuit design, or Python. - If Freelancer.com prevents you from bidding on this project or if you want to avoid “spending” one of your Freelancer bids you can apply "passively” for this project by pasting "MicroPython_ESP32_11_September_2019" into your Freelancer profile. Please see the section below in this posting called *** APPLYING "PASSIVELY" *** for more information. *** LOCATION *** You must live the Western Balkans in one of the following countries... Bosnia and Herzegovina, or Serbia, or Montenegro, or Kosovo, or Macedonia, or Albania. *** RATE *** I...

I'm seeking an experienced React developer to customize and develop functionalities in a dashboard for me. The key areas of focus will be: - Data Visualization: Primarily through tables with filters and functions that provide Restful-API. Your ability to create dynamic, interactive visualizations will be critical. - Real-Time Updates: This will be crucial to ensure the dashboard always reflects the most current data. The dashboard will be displaying a variety of data, primarily images, datasets, and records. Ideal Skills and Experience: - Proficient in React with a solid understanding of its core principles. - Experience in developing and customizing dashboard functionalities. - Skilled in creating data visualizations, particularly through tables with filters. - Knowledgeab...

I am looking for an experienced firmware developer who can work with the ESP32 platform. This project involves creating firmware for an IoT device. It is small project with mostly completed developments. Key Responsibilities: - Implementing sensor data reading and processing - Enabling wireless communication via BLE - Overseeing battery management and monitoring Ideal Skills and Experience: - Extensive experience with ESP32 - Proficiency in ADC (Analog to Digital Converter) - Skilled in Bluetooth Low Energy (BLE) communication - Knowledgeable in Battery Management Systems (BMS) If you are a talented firmware developer with the necessary skills and experience, I would love to hear from you. please do not bid if you not from NCR or Delhi

I'm seeking a seasoned business developer to secure contracts for my logistics company, specifically for long-haul transportation with prime mover trucks in Sydney. The target clientele is predominantly large corporations within the manufacturing sector. Key Responsibilities: - Identify and approach potential corporate clients in the manufacturing industry - Negotiate and secure long-haul transportation contracts - Leverage industry connections to enhance business growth Ideal Skills: - Proven track record in business development, particularly in logistics - Strong network within large corporations and the manufacturing industry - Excellent negotiation skills - Understanding of long-haul transportation and its logistics. Your expertise will play a crucial role in expanding o...

I am in need of an expert fundraiser who can help me raise $3,000 in two weeks on my GoFundMe page. If the target isn't met, I would require a full refund of my deposit. Your responsibilities would include: - Strategically promoting my GoFundMe page to ensure maximum visibility and reach. - Implementing various tactics to engage potential donors and encourage contributions. - Providing regular updates on the progress and adjusting strategies as necessary. Ideal skills and experience include: - Proven track record in successful online fundraising. - Excellent social media marketing skills. - Experience with GoFundMe and similar platforms. - Strong communication and persuasion skills. Please note: If we don't hit the target within the stipulated time, a refund of...

Find the Code Challenge down below and take it up or do not make an offer. Thank you ElectriCAD is looking to expand its software development team. We are seeking two qualified developers with expertise in building complex applications using user inputs to create interactive plans and diagrams in SVG. You are solution-oriented. You show perseverance and never give up when faced with challenges. You are passionate and involved in your projects. You are **creative** and **intelligent**. React is your tool of choice. JavaScript holds no secrets from you. You are passionate about DOM and creating engaging user interfaces. You are available for a full-time position with a minimum duration of 12 months. You are the person we are looking for. We have prepared a technical and creativ...

...Northwest Seed & Pet on it  4. Django, the grumpy cat  5. Kiwi, the bird (pineapple conure parrot) 6. The gorilla w/ jungle town above + Northwest Seed & Pet on top + Spokane, Wa est. 1944 on the bottom (top & bottom words in a circular arc) 7. Bongo, the bear + Northwest Seed & Pet on top + Spokane, Wa est. 1944 on the bottom (top & bottom words in a circular arc) *I can send a better pic asap. one of the entire bear showing him with no one sitting on it. 8. Tucker, the tortoise 9. Flower/Plant design with Northwest Seed & Pet Spokane, WA est. 1944 on top 10. Plants/Green House with Gertie the cat silhouette by the back door, Ruby the parrot on the pants table, and an iguana on the t...

...is functional but throwing deprecation warnings due to some dependencies. I need a skilled developer to: - Fix the deprecation warnings by addressing the dependencies issues - Deploy the fixed app on Vercel - Add a custom domain to the deployed app - Implement a password-protected page for user access only - Perform a thorough review of the existing codebase for additional issues - Optimize the web app for performance enhancements - Update the version to the latest stable release Experience with Vercel and domain management is a must. I also need your expertise in setting up the password protection. The specific method for this has not been decided yet, so I would appreciate your input on the best and most secure option. Please note, the goal is to make this w...

I'm looking for a skilled Kotlin developer based in Bangalore to help with modifying an existing app. The project involves a significant code rearchitecture. The ideal freelancer should have experience in making code more readable, enhancing scalability, and optimizing performance. Key Skills and Experience: - Proficiency in Kotlin - Experience in modifying existing apps - Strong skills in code rearchitecture - Ability to improve code readability - Experience in creating scalable apps - Skills in optimizing app performance Please note, this is an onsite job. Remote bids will not be considered.

I'm seeking a professional who can provide an AI-based service delivering stock trading signals. The service should focus on the following: - Markets: Signals should be relevant to the NYSE, NASDAQ, and the London Stock Exchange. - Types of Signals: I need accurate Buy/Sell recommendations and insightful Market trend analyses. - Include Stop-Loss Suggestions: Provide recommendations on appropriate stop-loss levels for risk management. - Add Take-Profit Targets: Suggest target prices for taking profits to maximize gains. - Identify Entry Points: Pinpoint optimal entry points for initiating trades. - Determine Exit Points: Identify ideal exit points to close trades effectively Ideal candidates for this project should have a strong background in AI and sto...

I need a comprehensive paper with an abstract on the topic of Emerging Integrity Assessment Technologies for Predictive/Preventive Pipeline Maintenance. The paper should primarily target industry professionals and should balance both predictive and preventive maintenance aspects equally. Along with the paper, I also need a PowerPoint presentation that encapsulates the key insights from the paper in a clear and engaging way for a professional audience. Ideal Skills and Experience: - Expertise in pipeline maintenance and integrity assessment technologies - Strong academic writing skills with experience in industry-focused papers - Proficiency in PowerPoint with a track record of creating engaging presentations - Understanding of predictive and preventive maintenance - Ability to expl...

I need a Pine Script expert to create a scalping trading strategy for me. The strategy will primarily use custom harmonics. Ideal Skills: - Extensive experience with Pine Script - In-depth understanding of scalping strategies - Proficiency in identifying and utilizing custom harmonics - Strong background in al...and interpretation to improve strategy decisions. - Ability to integrate APIs for real-time data and order execution. Please incorporate potential for high-frequency trading and low-latency optimization into the strategy. The script will be used for a live trading scenario, so robustness and reliability are key. The strategy should be optimized for specific market sessions like the New York or London sessions. The strategy should be optimized for 1-minute and 5-minute ti...

I'm seeking a top-notch SEO professional to propel my new waste management company's website to Google's top results swiftly. The emphasis should be on targeting local and 'low hanging' keywords. Key Responsibilities: - Content creation and backlinking - On-page and off-page optimization - Adding necessary information to my website I require continuous, high-quality, non-AI generated content for my site, primarily blog posts. For on-page optimization, content optimization is my main concern. The ideal candidate for this project should: - Have proven experience in SEO - Have a track record of successful site optimizations - Be capable of creating engaging, high-quality content - Understand and be able to implement effective backlinking str...

ElectriCAD is looking to expand its software development team. We are seeking two qualified developers with expertise in building complex applications using user inputs to create interactive plans and diagrams in SVG. You are solution-oriented. You show perseverance and never give up when faced with challenges. You are passionate and involved in your projects. You are **creative** and **intelligent**. React is your tool of choice. JavaScript holds no secrets from you. You are passionate about DOM and creating engaging user interfaces. You are available for a full-time position with a minimum duration of 12 months. You are the person we are looking for. We have prepared a technical and creative challenge to select candidates who will demonstrate their creativity and, above all,...

Create 500 Blog Article with our CustomGPT and post with schedule on our blog. (No Python or other automation allowed)

Create 500 Blog Article with our CustomGPT and post with schedule on our blog. (No Python or other automation allowed)

I'm looking for an experienced full-stack developer to help create a FinTech SaaS platform. Although I haven't defined specific functionalities yet, I expect the platform to be robust and scalable, with potential for features like payment processing, investment management, and financial reporting. Please share your previous projects in SaaS platform using AWS

I am in need of five IT Support Technicians to provide on-site hardware repair and maintenance services across multiple cities in Switzerland. This role entails troubleshooting, diagnosing, and repairing IT equipment, including desktops and laptops, on an as-needed basis. Required Skills & Qualifications: - Proven experience in IT support, hardware repair, or field service. - Strong knowledge of PC hardware, operating systems, and peripherals. - Ability to diagnose and resolve hardware and software issues effectively. - Experience handling spare parts, component replacement, and system upgrades.

Need an experienced WordPress developer to customize my pre-purchased e-commerce theme. Must have expertise in WooCommerce setup, payment gateway integration (Razorpay/Paytm), and mobile responsiveness. Budget: ₹2,000-3,000 INR. Share your portfolio of live e-commerce websites. Only apply if you’ve worked with themes like Astra, Flatsome, or Divi. Please note, my budget for this project is ₹2,000-3,000 INR. Only serious applicants who meet these criteria and can share relevant portfolio links will be considered. The project deadline is within 2 weeks.

I'm looking for a comparative study on obstacle avoidance algorithms utilizing the Robot Operating System (ROS). The focus of this project will be on reactive and hybrid algorithms, specifically applied to wheeled robots. Key Aspects of the Project: - Evaluation of Accuracy: The primary performance metric to be assessed is the accuracy of the obstacle avoidance. - Utilization of ROS/Gazebo: The study will strictly employ the Robot Operating System (ROS) for the simulation (Gazebo) and testing of the algorithms. - Focus on Wheeled Robots: All evaluations and comparisons will be conducted using wheeled robots. Ideal Skills and Experience: - Extensive knowledge and experience in robot programming, specifically with ROS. - Proficient understanding of both reactive ...

I'm looking to enhance my professional connections on Freelancer. I'm particularly interested in one-on-one calls to foster these relationships. Ideal Skills: - Excellent communication skills - Proficiency in using Freelancer's platform - Networking experience - Ability to facilitate calls Experience: - Prior experience in professional networking - Proven track record of building connections Please note, I'm not looking for collaborations with other freelancers or an increase in my client base at this moment. My main focus is on developing my professional connections.

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I'm in need of a professional SEO expert who specializes in On-page SEO. The primary focus will be on optimizing the content of my landing pages. Ideal Skills and Experience: - Proven experience in On-page SEO - Strong expertise in content optimization - Familiarity with landing page SEO best practices - Ability to deliver measurable improvements in page ranking and traffic

seeking an experienced Senior React Developer or a development team/company to assist in finalizing a CRM, inventory management, and scheduling platform. The project is already in progress, and we need skilled professionals to help bring it to completion efficiently. Responsibilities: • Finalize and optimize the front-end of the platform using React. • Ensure seamless integration with backend services. • Enhance UI/UX based on feedback. • Debug and improve existing functionality. • Optimize for scalability and performance. Requirements: • 10+ years of experience in web development. • Expertise in React, Redux, TypeScript, and modern frontend development. • Strong understanding of REST APIs, WebSockets, and real-time data handl...