Struts 2.3 to 2.5 migration issues jobs

...looking for a PhoneGap plugin that will work on both Android and iOS to handle WebSocket connections and manage the receipt of notifications. We need a PhoneGap/Cordova plugin for both Android and iOS platforms that enables our mobile application to connect to a WebSocket server and handle notifications efficiently. The plugin must support the following functionalities: Key Features: 1. WebSocket Connection: - Establish a connection to a specified WebSocket server. - Maintain the connection and handle reconnections as necessary. 2. Receive Notifications: - Listen for incoming messages/notifications from the WebSocket server. - Process the incoming messages and trigger a push notification on the device. 3. Push Notifications: ...

I have an extensive .mbox mailbox file that I need to import into my existing Gmail account. Key Project Details: - The .mbox file is more than 5GB in size, so the job requires someone who is familiar with managing large data transfers. - The file was exported from Gmail, which means the importing process might have some intricacies that need to be navigated. Ideal Freelancer: - Proficient in working with .mbox mailbox files and Gmail. - Experienced with importing large data sets into Gmail without causing any issues. - Excellent problem-solving skills for potential roadblocks in the import process.

I've been having an issue with the tabs on my website. They're not opening when clicked. Site: Some more details: - There are no error messages displayed when attempting to open the tabs. - I've tested the tabs on Chrome, Firefox, and Safari. I'm looking for a skilled developer who could troubleshoot the issue and make the tabs functional again. The ideal candidate should possess: - Proficiency in HTML and JavaScript. - Experience in debugging and troubleshooting similar issues. - Familiarity with cross-browser compatibility testing. This is a relatively small project and shouldn't take much time for someone with the right expertise.

...of an experienced Django developer to debug and troubleshoot issues within my existing Django project. Specifically, I have been encountering issues with the nginx server. Key Responsibilities: - Debug and troubleshoot existing Django project - Resolve issues related to the nginx server Ideal Skills and Experience: - Proficient in Django web framework - Expertise in troubleshooting and debugging Django projects - Experience with nginx configuration and troubleshooting - Strong understanding of database models, views, and templates in Django - Ability to efficiently integrate third-party libraries if necessary Please note that this project is primarily focused on fixing issues within an existing project rather than creating new features...

Hi Simmi, I will be configuring spring security in your app. It will be based on the existing struts app. Thanks Sabareesan

...is a must. This includes the ability to efficiently navigate and modify the website's codebase. Your Responsibilities: - Implementation: Your primary task will be to implement the schema markup for the individual product pages. This includes ensuring that the markup is correctly placed and configured for maximum visibility and performance. - Testing & Optimization: After the implementation, you should conduct thorough testing to ensure that the schema markup is properly functioning and delivering the expected results. If there are any issues, you should be able to identify and address them promptly. Please make sure to provide examples of previous schema markup work you have done, especially for physical products. The ideal candidate ...

...experience in AWS API Gateway, Python, and possibly other related technologies to troubleshoot and fix a persistent connection issue I'm facing. Requirements include: - In-depth knowledge of AWS API Gateway, for REST API specifically - Solid experience with Python, as my backend system is built using this language The issue I'm having involves regular 'connection refused' errors when trying to fetch data from the API. This has been an ongoing issue, and I need an expert who can identify the root cause and implement a solution to ensure reliable, uninterrupted connectivity. It would be beneficial if you have experience in troubleshooting and resolving similar API Gateway issues in the past. A proactive approach to problem-solvin...

I'm in need of someone with strong experience in PostgreSQL for some critical tasks. ...need of someone with strong experience in PostgreSQL for some critical tasks. - The ideal candidate should be well-versed in PostgreSQL, with a background in both database administration and development. - You must be able to handle complex issues that may arise with the database and be capable of performance tuning when necessary. - I expect you to understand the nuances of PostgreSQL and be able to provide solutions to potential problems with the database. - Any experience with data migration, query optimization and database design will be a plus. Please make sure to include your past work and experience with PostgreSQL in your application...

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

I'm seeking a skilled and conscientious Android user who can help us id...bugs in our app's beta version. Key Responsibilities: - Daily testing: You'll be expected to provide daily feedback on any bugs you find. This will help us maintain a smooth and error-free user experience. - Detailed bug reporting: Clear, concise and detailed reporting on any bugs identified is crucial for our development team to address these issues quickly and efficiently. Ideal Candidate: - Experienced Android user: To be effective at this role, you should be very comfortable using Android phones. - Detail-oriented: You should be able to spot and describe even the smallest bugs. - Strong communication skills: Your feedback will be vital for our development, so t...

I'm seeking a skilled and conscientious Android user who can help us id...bugs in our app's beta version. Key Responsibilities: - Daily testing: You'll be expected to provide daily feedback on any bugs you find. This will help us maintain a smooth and error-free user experience. - Detailed bug reporting: Clear, concise and detailed reporting on any bugs identified is crucial for our development team to address these issues quickly and efficiently. Ideal Candidate: - Experienced Android user: To be effective at this role, you should be very comfortable using Android phones. - Detail-oriented: You should be able to spot and describe even the smallest bugs. - Strong communication skills: Your feedback will be vital for our development, so t...

I'm looking for a skilled game tester to assist in the quality assurance of my upcoming action game. The game runs on a PC, so it is crucial that you have access to a compatible system. Your main responsibility will be to identify, record, and track any bugs or glitches in the game. This will involve playing through the game multiple times, under different conditions, to ensure all potential issues are captured. It is essential that the successful candidate has: - A keen eye for detail - A methodical approach to problem-solving - Excellent communication skills to accurately report bugs Previous experience in game testing, particularly on PC, would be highly advantageous. Job is only around 15 - 30 minutes.

I kindly ask for payment that I did up to here: - Inspect the code and remove Invisible mode section on profile page for mobile and desktop theme - Enable/fix youtube video's sound for desktop version of script

Hello! My company, , just launched our updated website and product. It is free to try, but we are looking for paid testers beyond that. I am looking for teams or individuals with some software experience to visit our site and sample our AI powered component UI generator. Please send me your proposal(s) Looking for this to be done as quickly as possible. More user feedback, the better.

I am currently having issues updating my pages with Elementor, and I'm not receiving any error messages. Additionally, I've noticed that my website's performance is slow and could benefit from more memory. Key Requirements: - Troubleshoot and resolve the issue of Elementor not updating pages without error messages. - Optimize the website's performance to improve its speed. Ideal Skills and Experience: - Proficient in WordPress and Elementor. - Experience in troubleshooting and resolving plugin compatibility issues. - Demonstrable experience in website optimization for speed and performance enhancement. Your bid should address these points specifically. Please provide examples of similar work you've completed in the past.

I'm in need of a skilled game tester to assess the functionality of my PC action game. Key Responsibilities: - Conduct functionality testing: You will be required to play through the game, ensuring that all features work as intended. - Identify Bugs: Any bugs, glitches, or issues you encounter while playing need to be documented clearly. Ideal Skills and Experience: - Strong background in game testing: Preferably with experience in testing action games. - Knowledge of functionality testing: You should be familiar with the process of assessing the game features. - Excellent attention to detail: Able to spot even the smallest issues and accurately document them. This role would be perfect for a game tester with a keen eye for detail an...

I'm in need of a skilled game tester to assess the functionality of my PC action game. Key Responsibilities: - Conduct functionality testing: You will be required to play through the game, ensuring that all features work as intended. - Identify Bugs: Any bugs, glitches, or issues you encounter while playing need to be documented clearly. Ideal Skills and Experience: - Strong background in game testing: Preferably with experience in testing action games. - Knowledge of functionality testing: You should be familiar with the process of assessing the game features. - Excellent attention to detail: Able to spot even the smallest issues and accurately document them. This role would be perfect for a game tester with a keen eye for detail an...

...Books system for my invoicing processes. Requirements: - Configure the system to enable the creation of goods and service invoices in USD. - Implement moderate customization to the invoice templates, focusing on layout changes and adding custom fields. - Import all of my product information from an Excel sheet. This includes product names and their respective cost prices (which are in INR). - Enable and Teach me to Use Odd's OCR feature to fetch pdf data from invoice to transfer it to software Ideal Candidate: - Proficient in working with Odoo Books and setting up invoicing processes. - Experience with customizing invoice templates within Odoo. - Skilled in data import from Excel sheets to Odoo. I look forward to workin...

I have an Amazon security audit and they require a Penetration Test of my windows desktop application. What I need is a automated tool to test and provide a report that shows my application does not have security issues and is not accessible from the web. There is no end-point to my application as it is not web facing and is a stand alone application. This is to satisfy Amazon security review. I'm looking for a skilled professional to conduct a penetration test on my Windows desktop application. Key Requirements: - Conduct a automated penetration test specifically tailored for a Windows desktop application. - Ensure the test covers all potential vulnerabilities and security risks. - Provide detailed reports on the findings, including any ex...

Looking for a skilled, personable, and dedicated CFA level 1 coach to guide me through my studies. Communication: - I am open to communicative through email, phone calls, and video conferences to have regular check-ins and to keep track of my progress. Duration: - I have not defined a specific duration for the sessions. I expect the duration to be determined by the topic(s) at hand and the depth of explanation required. Flexibility in this matter is appreciated. Topics: - I haven't specified the topics yet. The issues to be addressed will likely evolve and become more clear as the coaching progresses. I need a coach capable of covering all the key aspects of CFA. Requirements: - Previous experience teaching CFA students. - Solid ...

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I'm in need of a skilled game tester to assess the functionality of my PC action game. Key Responsibilities: - Conduct functionality testing: You will be required to play through the game, ensuring that all features work as intended. - Identify Bugs: Any bugs, glitches, or issues you encounter while playing need to be documented clearly. Ideal Skills and Experience: - Strong background in game testing: Preferably with experience in testing action games. - Knowledge of functionality testing: You should be familiar with the process of assessing the game features. - Excellent attention to detail: Able to spot even the smallest issues and accurately document them. This role would be perfect for a game tester with a keen eye for detail an...

Japanese to English Proofreading 5-365

I'm looking for a professional tester to ensure the smooth running and quality of my PC Action game. Key Responsibilities: - Primarily focus on bug and glitch finding. - Have steam account Ideal Skills: - Experienced in testing PC games specifically in the Action genre. - Skilled in debugging, diagnosing, and reporting issues.

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

we need an application to simulate the view of a person with vision impairment. so that a person with healthy eyesight can see the world as a disabled person sees the world. the application should work on oculus 3d glasses (version 3). the application works in AR mode. should distort the image the user sees. . We will prepare the transformation algorithm itself. we need someone who will prepare an application that distorts the image and will show us where in the source code we should define the algorithm.

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

I need a professional who can analyze the logs of my Apache PHP-FPM server and help me troubleshoot errors. The main focus of this task is to identify and resolve any issues that might be impacting the performance of the server. Key Requirements: - The ideal candidate should have a solid understanding of Apache PHP-FPM logs and their structure. - Good troubleshooting skills are necessary to pinpoint the root causes of the errors. - Ability to present the analysis results in a detailed report is crucial. The main goal is to ensure the server is running smoothly and efficiently. The server use Centos 7, Apache and PHP 5.6

I'm in need of a skilled beta tester who can work on my Steam project immediately. Your primary focus will be on the user interface, performance and optimization. Key Responsibilities: - Thoroughly test the user interface of the project, providing feedback on usability and design. - Conduct performance and optimization testing to ensure the project runs smoothly on various devices. - Document bugs and issues for troubleshooting and resolution. This project has a tight deadline and I need someone who can start immediately. Please only bid if you have experience with Steam projects and beta testing. Being familiar with game development and design will be an added advantage.

I will pay no more than 30 dollars for this work. Please do not send a bid if you are going to offer a higher price. I'm seeking a skilled PHP programmer proficient with Cora. The goal is to automate the sharing of articles from my website to my business Facebook page. Key requirements: - Automate sharing: I want the programmer to ensure that whenever a new article is uploaded to my website, it's automatically shared to my business Facebook page. - Cora PHP programming: The ideal candidate should have experience with Cora PHP programming, specifically related to integrating website content with Facebook. - Facebook page sharing: The articles should be shared only on my business page, ensuring they reach my target audience. Your ...

I'm in need of a skilled beta tester who can work on my Steam project immediately. Your primary focus will be on the user interface, performance and optimization. Key Responsibilities: - Thoroughly test the user interface of the project, providing feedback on usability and design. - Conduct performance and optimization testing to ensure the project runs smoothly on various devices. - Document bugs and issues for troubleshooting and resolution. This project has a tight deadline and I need someone who can start immediately. Please only bid if you have experience with Steam projects and beta testing. Being familiar with game development and design will be an added advantage.

I'm in urgent need of an experien...Laravel developer for a VPS-hosted application. The application is facing some critical issues which need immediate attention. Key Responsibilities: - Quickly identify and resolve user interface issues. - Address database errors and ensure data integrity. - Implement necessary optimizations to ensure smooth running of the system. This project requires immediate action as the application is currently not functioning optimally. Hence, the ideal candidate should be able to work under pressure and deliver results within a limited time frame. Skills and Experience Required: - Proven experience with Laravel, particularly in debugging and fixing issues. - Strong knowledge of VPS hosting environments. - Ability to...

Objective: Our company aims to automate its logistics process to improve efficiency and reduce manual workload. We are looking for a freelancer with expertise in automation to develop a system that streamlines the process from transport request to courier confirmation. *** Current Process *** (The current process excel files will be given aswell as the detailed process) Request Submission: Teams within the company fill out an Excel file with transport details, including pickup location, destination, size, and weight of the shipment. Courier Selection: The logistician identifies 3 or 4 potential couriers from a database based on the transport's distance, size, and location. The logistician contacts these couriers via Outlook to inquire about...

I'm looking for an experienced beta tester to help with the testing of a new computer application designed for Steam. The key focus of the testing is the Game installation process. Key responsibilities: - Conducting thorough beta testing of the software - Providing detailed feedback on the user experience - Identifying and reporting any bugs or issues related to the game installation process Ideal skills and experience: - Previous experience with beta testing for software or applications - Strong understanding of the Steam platform - Proficient in identifying and documenting software bugs - Excellent communication skills to provide detailed feedback Please note that the testing should be focused specifically on the game installation process, so experienc...

I'm looking for a professional tester to ensure the smooth running and quality of my PC Action game. Key Responsibilities: - Primarily focus on bug and glitch finding. - Have steam account Ideal Skills: - Experienced in testing PC games specifically in the Action genre. - Skilled in debugging, diagnosing, and reporting issues.

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

...a skilled tester to help identify and resolve any lingering bugs, ensuring a seamless player experience. Here's what I'm looking for: - **Key Focus Areas:** - Comprehensive testing of gameplay mechanics to unearth bugs that have slipped past the development phase. - Keen attention to detail to track and document encountered issues accurately. - **Primary Goal:** - The main objective of this testing phase is to identify and fix as many bugs as possible to polish the game for launch. - **Ideal Skills and Experience:** - Extensive experience in game testing, particularly on PC platforms. - Familiarity with different bug tracking software to document issues effectively. - A strong understanding of gamepl...

...diligent freelancer to help in testing the gameplay balance of our latest PC game. The core focus of your responsibilities will be: - **Gameplay Testing:** Deep dive into the gameplay, ensuring the mechanics are engaging and balanced. - **Balance Issues Identification:** Critically analyze and report on gameplay balance. This involves playing through the levels, understanding the game mechanics, and identifying areas that feel too easy or too challenging. - **Feedback & Suggestions:** Provide constructive feedback on how to improve gameplay balance. Your insights will be invaluable in tuning game mechanics to enhance the player experience. **Ideal Skills and Experience:** - Proven experience in PC game testing, particularly gameplay aspects. - Keen anal...

I'm looking for an expert to help me fix an error on my website. The site is not specified as to what the problem is and I would need a thorough diagnosis and resolution. Additionally, I'm experiencing some uncertainty with my Google Merchant Center listings, but I'm not sure of the details. Key Responsibilities: - Diagnosing and fixing errors on my website - as the specifics of the issue are currently unknown, an analytical approach and problem solving skills will be required. - Troubleshooting and correcting any issues in my Google Merchant Center listings - this may involve identifying missing products, incorrect prices, or discrepancies in product descriptions. Ideal Skills and Experience: - Proven experience in website troubleshooting and e...

I'm in urgent need of a Laravel expert to help me fix the bugs in my application. The issues I'm facing are unspecified at the moment, but they are critical enough to require immediate attention. Ideal Skills and Experience: - Proven experience in Laravel: The freelancer should have a strong track record of working with Laravel, and be comfortable troubleshooting and debugging within the framework. - Problem-solving skills: The ability to quickly and accurately diagnose issues is essential. - Time Management: The freelancer should be able to work under tight deadlines, as this project requires immediate attention.

I'm currently experiencing an issue with Google Adsense on my WordPress site. I have not attempted any fixes yet. I'm looking for someone who's well-versed in this area to help me out. Key Points: - Fixing Google Adsense issue on a WordPress site - Must have experience in handling similar issues - I have access to the file manager, so you can make necessary changes Ideal Skills: - Strong understanding of Google Adsense and how it interacts with WordPress - Experience in resolving issues - Proficient in using WordPress file manager Please reach out if you think you can help.

...Specifically, I'm unable to send messages. The automation is running on Windows and the script is written in Node.js. Key requirements: - Diagnose and fix the issue: The core problem lies in the inability to send messages. As such, the ideal candidate should have a strong understanding of OpenCV and related concepts, as well as experience with automation on WhatsApp. They should be able to quickly pinpoint the issue and implement the appropriate solution. - Windows proficiency: The automation is running on a Windows platform. The ideal candidate should be familiar with the quirks and intricacies of automation on this OS. - Node.js expertise: The script is written in Node.js. The freelancer should have comprehensive experience with this language, and be able...

I'm experiencing an issue where my website isn't loadin...issue where my website isn't loading. This problem has emerged recently, without me making any recent changes to the website or server configurations. I need a skilled professional to help me quickly troubleshoot this issue and get my website back online. Your role will involve: - Investigating and identifying the root cause of the website's failure to load - Resolving the issue effectively and efficiently - Ensuring the website operates smoothly post-fix Ideal candidates should have extensive experience in troubleshooting websites that run on Apache servers. Strong familiarity with PHP-FPM and Webmin will be a significant advantage. Your ability to identify and remedy server iss...

...wired speaker connection. More specifically, it involves my much older sony AVR, which is connected to a new scarlett audio interface. All 4 speakers worked on an older interface. Now, I'm having issues with the RCA to TS/TRS connection/balancing act. I need a freelancer with a strong background in audio engineering, particularly in troubleshoot wiring and connection issues. Having experience with both AVRs and audio interfaces would be ideal. Expertise required include: - Extensive knowledge of wired audio connections. - Experience with RCA, TS/TRS connections. - Proficiency in problem diagnosis and solution implementation. - Understanding of AVRs and audio interfaces. The goal here is to get my desktop monitors and tower speakers working prope...

...two main areas: theme customization and website migration. Key Tasks: - **Theme Customization**: I have a specific design in mind for my website and I need someone who can help me bring it to life by customizing the chosen theme to align with my vision. - **Website Migration**: I'm planning to move my current website to a WordPress platform. The selected freelancer will be responsible for a smooth and seamless migration, ensuring no data is lost in the process. Ideal Skills and Experience: - Proven experience in WordPress theme customization is a must. - Solid experience in website migration, ensuring minimal to no downtime during the process. - Strong communication skills, as there will be regular updates requir...

...troubleshooting issues related to printing PDFs. Additionally, I'd like to streamline my paystub downloading process to avoid the need for printing, looking to have them saved directly as PDFs. Key Responsibilities: - Troubleshoot QuickBooks Snappt: I need assistance to ensure that the PDFs generated are correctly formatted and able to print efficiently. - Automation of Paystub Downloads: I'm looking for a solution that will download paystubs directly as PDFs, without the need for printing. This should enhance efficiency and save time in the long run. Ideal Skills and Experience: - Proficiency in QuickBooks: Experience with QuickBooks, especially Snappt, is fundamental for this project. - Troubleshooting Abilities: A proven tr...

...Error 500 issue that's occurring when users access my website. The error seems to be an 'Internal Server Error', but I'm not sure what's causing it or how to fix it. Key Tasks: - Identify the root cause of the Error 500 - Implement a solution to resolve the issue - Provide recommendations to prevent similar errors in the future Ideal Skills and Experience: - Extensive experience with WordPress - Proven ability to troubleshoot and fix Error 500 issues - Familiarity with server configurations and potential causes of Internal Server Errors - Strong problem-solving skills to identify and resolve the root cause of the issue - Good communication to explain the issue and recommended solutions in a way that'...

I'm looking for a skilled professional to transfer my existing funnel from Ready2Launch to a new platform Clixlo, they are both the same mainframe so it would be like pulling a funnel by the click of the link but all the automations is where I get lost., while keeping the same structure and design. Key requirements: - Migration of all existing components: Opt-in form, Sales page, Upsells, Email integrations - Design: Utilize a pre-designed template for the new platform Ideal candidates should have: - Experience in funnel migration, especially from Ready2Launch - Proficiency in the chosen platform for migration - Strong attention to detail to ensure all features are carried over correctly - Good understanding of design principles fo...