You will get an increased Ruby On Rails performance
Project details
Prepare for an enhanced application! With over 9 years of Ruby on Rails development expertise. I have experience improving Ruby On Rails performance by over 90%.
Programming Languages
Ruby/Ruby on RailsCoding Expertise
Performance OptimizationWhat's included
| Service Tiers |
Starter
$100
|
Standard
$500
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 15 days |
Number of Revisions | 1 | 3 | Unlimited |
Number of Pages | 10 | 30 | 100 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$50
41 reviews
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EP
Elias P.
Aug 3, 2025
Replit Code Review and Corrections
Uysim was an absolute and total disaster to work with. He represented to us he understood and was familiar with Replit. So when we engaged him we took him at his word based on his ratings. We get into it and he is trying to find where data is stored in Replit and is not at all aware that Neon is Replit's for the basic database needs. He tells us our previous human developer must have set up Neon outside of Replit, had a lot of questions there. We frantically googled "Replit" and "Neon" ... and were led to Replit's own Dev documentation that it uses Neon. We sent Replit's own Dev documentation to him. HIs response: "OK, I'm good now." ?? How does someone that represents knowledge of Replit not know about Replit's use of Neon? And even if they didn't know, how does a dev not do a basic Google search to determine what may be going on on a platform? We, as non-devs, ended up Googling, finding the answer, and sending him to Replit's own dev documentation!
That alone alarmed us. We asked him to set up basic AI LangChain and RAG. Everything looked OK until we tested it. When we tested it, the AI agent was taking 15 to 25 seconds (roughly) to return a response. It did not strike us as right. We checked it with another developer well versed in AI, RAG, and LangChain who discovered Uysim set up the RAG/LangChain architecture very inefficiently ... resulting in token usage 7x the usage it should be taking and that the amount of information sent to the AI agent via API was bloated and structured inefficiently. The other expert we engaged quickly corrected this and brought token usage down by 700% while still accomplishing the same thing. We basically had to throw out all the work that Uysim did.
When we reached out to Uysim and raised our concerns he was unapologetic, defensive, and demanded full payment. We offered to pay him for the non-RAG and non-LangChain work, but given that the RAG and Langchain work had to be completely reconfigured because the work he did was unusable. he was unapologetic, defensive, and adamant that he worked the hours performed and he expects to be paid all hours worked. We told him we were expecting the hours would result in the outcome we requested or something remotely close to it.
I have had countless positive experiences here on Upwork. I can only count one other instance where I had a negative experience. I am disappointed with Uysim's uncompromising and unrelenting position. Contract with him at your own risk. It pains me to write a review like this. But I've had enough.
That alone alarmed us. We asked him to set up basic AI LangChain and RAG. Everything looked OK until we tested it. When we tested it, the AI agent was taking 15 to 25 seconds (roughly) to return a response. It did not strike us as right. We checked it with another developer well versed in AI, RAG, and LangChain who discovered Uysim set up the RAG/LangChain architecture very inefficiently ... resulting in token usage 7x the usage it should be taking and that the amount of information sent to the AI agent via API was bloated and structured inefficiently. The other expert we engaged quickly corrected this and brought token usage down by 700% while still accomplishing the same thing. We basically had to throw out all the work that Uysim did.
When we reached out to Uysim and raised our concerns he was unapologetic, defensive, and demanded full payment. We offered to pay him for the non-RAG and non-LangChain work, but given that the RAG and Langchain work had to be completely reconfigured because the work he did was unusable. he was unapologetic, defensive, and adamant that he worked the hours performed and he expects to be paid all hours worked. We told him we were expecting the hours would result in the outcome we requested or something remotely close to it.
I have had countless positive experiences here on Upwork. I can only count one other instance where I had a negative experience. I am disappointed with Uysim's uncompromising and unrelenting position. Contract with him at your own risk. It pains me to write a review like this. But I've had enough.
MK
Mathias K.
Jul 1, 2025
Full stack engineering support for new features, improvements, optimizations and bugs
Uysim successfully delivered new features, improvements, optimizations, and bug fixes while demonstrating ownership over his deliveries. He even helped us build a multi-step AI Agent for POC successfully.
WM
William M.
Jun 27, 2025
Help with RoR Website (transfer between two payment systems)
Thanks! Great work. Will work again in the future.
CV
Christophe V.
Jun 23, 2025
Looking for Full Stack Developer in Ruby on Rails and React to develop new featiures
Uysim is a hell of a good software developer. It was sometimes difficult to make him finalise features in much detail as he already started to work on other features. Would definitely work with him again in the future.
AP
Anthony P.
Aug 1, 2024
Fractional CTO for on-going project
Uysim is one of the best developer's that I have ever worked with. He is reliable, hard working and VERY good at what he does. I would recommend him to anyone looking for help when it comes to technology development work.
He will be an asset to your company, guaranteed!
He will be an asset to your company, guaranteed!
About Uysim
Full Stack | AI | Ruby | Python | ReactJS | LangChain - Expert-Vetted
93%
Job Success
Phnom Penh, Cambodia - 9:09 am local time
🚀 𝗘𝘅𝗽𝗲𝗿𝘁 𝗶𝗻 𝗽𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗶𝗻𝗴, 𝗰𝗹𝗲𝗮𝗿 𝘁𝗵𝗲 𝗯𝗹𝗼𝗰𝗸𝗮𝗴𝗲, 𝗮𝗻𝗱 𝘀𝗰𝗮𝗹𝗲 𝘁𝗵𝗲 𝘀𝘁𝗮𝗿𝘁-𝘂𝗽
✅ Vibe coding with AI while keeping code base well structured to ensure of future scale
From what I come across, I have sharpened skills that required for start-up
- Back End: Ruby On Rails, NestJS, Serverless
- Front end: ReactJS, VueJS, NextJS, Jquery, Bootstrap, Tailwind, and Sass
- AI: LangChain, LangGraph, AI Agent
- Containerization: Docker, Kubernetes
- Web Server: Nginx, Apache
- TDD/BDD: RSpec, Cucumber, Capybara, Selenium, Jest, Cypress
- API: GraphQL, RestAPI, JSON-API
- Mobile: React Native (Expo)
- Continuous Integration: Github Action
- Version Control: Git
- Database: PostgreSQL, MySQL
- Cloud platforms: AWS, Google Cloud, Heroku, Linux Server
- Machine Learning: HuggingFace, Keras, PyTorch, SkLearn
- Code Editor: Cursor
Specialized in building multi-agent AI platforms that analyze data, generate insights, and recommend actionable strategies. My systems deploy specialized AI agents—business analysts, managers, and developers—that collaborate like a virtual team to validate results before delivering decisions. This approach transcends typical AI chat tools, focusing on business decision automation.
Proof of building a complex multi-agent AI platform analyzes data, generates insights, and suggests actionable strategies
I have worked with business models: KYC, CRM, Marketing, FineTech, artificial intelligence (AI), Real Estate Customization and Management, Marketing, e-commerce, Market Place and Classified ads.
I am always open to new ideas and like solving challenges. Don’t hesitate to contact me regardless of the project complexity you need!
Steps for completing your project
After purchasing the project, send requirements so Uysim can start the project.
Delivery time starts when Uysim receives requirements from you.
Uysim works on your project following the steps below.
Revisions may occur after the delivery date.
Give access to repository
Monitory and analyze perform logs