You will get Ruby on Rails Developer CTO-level for technical interview
Top Rated
Project details
Hiring the right backend developer is difficult — especially if you are not a technical founder or if you want a trusted expert to validate a candidate before hiring.
I offer CTO-level technical interview services for backend developers of any level: Junior, Middle, Senior.
With 8+ years of experience in Ruby on Rails, JavaScript, system design, APIs, databases, architecture, scaling, and DevOps, I will professionally evaluate your candidate and provide a clear summary of their strengths, weaknesses, and overall fit for your project or team.
What I analyze during the interview:
Backend fundamentals
Coding skills & problem solving
System design & architecture thinking
Database knowledge
API design
Testing & code quality
Real-world project experience
Communication & seniority level
Ability to work independently
After the interview, you will receive a detailed written report with my recommendation.
This service is ideal for:
founders hiring their first developer
companies expanding their backend team
non-technical CEOs who need expert validation
agencies that want to avoid wrong hires
I offer CTO-level technical interview services for backend developers of any level: Junior, Middle, Senior.
With 8+ years of experience in Ruby on Rails, JavaScript, system design, APIs, databases, architecture, scaling, and DevOps, I will professionally evaluate your candidate and provide a clear summary of their strengths, weaknesses, and overall fit for your project or team.
What I analyze during the interview:
Backend fundamentals
Coding skills & problem solving
System design & architecture thinking
Database knowledge
API design
Testing & code quality
Real-world project experience
Communication & seniority level
Ability to work independently
After the interview, you will receive a detailed written report with my recommendation.
This service is ideal for:
founders hiring their first developer
companies expanding their backend team
non-technical CEOs who need expert validation
agencies that want to avoid wrong hires
Target Country
WorldwideWhat's included $99
These options are included with the project scope.
$99
- Delivery Time 2 days
- Candidate Screening
- Interview Consulting
- Recruiting Process Consulting
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DG
Dmitry G.
Jun 16, 2026
Ruby on Rails developer / SaaS developer / web application developer for technical audit
Ihor and his team did a great job reviewing our Ruby on Rails Saas application. He carefully analyzed the codebase, architecture, integrations, billing system, database, and front end, and provided a clear report with findings and recommendations. Communication was super smooth, highly recommend this guy and his team for any Ruby on Rails or SaaS development work.
AB
Alex B.
Feb 5, 2026
Ruby on Rails Developer / Web Application Developer – API, Stripe & React Tasks
All the work was done to the highest standard, even more than expected. I will definitely contact you again.
JK
John K.
Jan 22, 2026
UX Improvement & Responsive Design
Ihor is one of the best contractors that we've found on Upwork to date. He's always been super responsive, accountable for his work, and delivers quality results. We plan on working with Ihor for many more development projects in the future.
JK
John K.
Jun 19, 2025
Security / Code Improvements for Web Based Application
Working with Ihor has been fantastic. He is an exceptionally clear communicator; honest in his work and estimates and works hard to ensure a quality output. He's provided quick turn-around on requests and always keeps me updated as to his progress. I highly recommend working with Ihor - he's proven to be very skilled at Ruby/Rails; security audits; bug fixes/monitoring and now front-end development as well.
JK
John K.
Aug 2, 2024
Website / Web App Security Audit
Ihor was wonderful to work with. He understood the project perfectly, thoroughly audited our systems, and provided clear and concise suggestions. He turned the project around very quickly and was easy to communicate throughout. Highly recommend.
About Ihor
Ruby on Rails Developer & SaaS Developer | Web Application Developer
100%
Job Success
Cherkasy, Ukraine - 12:03 am local time
If you’re looking for a Ruby on Rails developer who understands SaaS products, a full stack developer Saas who sees the entire system, or a react developer who values real user experience — let’s talk.
I’m a Ruby on Rails developer with strong product thinking who helps startups and growing companies build reliable, scalable, and maintainable platforms for long-term success. My background includes building modern web app platforms and scalable web application systems with custom web design, software architecture and design, and scalable API integration practices.
As a Ruby on Rails developer, I work closely with founders, CTOs, and product teams to turn business requirements into stable, production-ready solutions. I have extensive experience as an AI Saas developer, focusing not only on backend implementation but also on growth, retention, and monetization. As a web app developer, I design systems around real workflows, combining strong web app design and performance using JavaScript, CSS, HTML5, Bootstrap, and TypeScript.
🧠 Deep product-focused experience
With over 9 years of experience, I’ve worked on everything from MVPs to high-traffic systems. I’ve contributed to multiple products as a SaaS developer, including chatbot Saas solutions and platforms powered by ruby on rails openai. My work often involves building scalable web application development systems with strong architecture, RESTAPI, API development, and Database architecture.
I’ve also worked on frontend integrations as part of Ruby on Rails React stacks, ensuring smooth UX and consistent web design across products. As a full stack ai saas developer, I bridge frontend, backend, and infrastructure to deliver complete solutions, including saas mobile app integrations where needed using React Native, Next.js, Vue.js, Angular, and Node.js.
⚙️ What I do
Ruby on Rails application development from MVP to scale
SaaS platform architecture and system design
Custom backend logic and API development (REST & GraphQL)
Background jobs, queues, and async processing
Cloud deployments, CI/CD pipelines, and automation
Third-party integrations and advanced workflows
Beyond traditional SaaS platforms, I’ve worked on ecommerce systems and custom solutions as a web developer, including Shopify integrations. I’ve also built AI-powered features as part of AI Saas platforms, acting as a full stack saas developer ai agents to deliver intelligent automation, AI Agent Development, Large Language Model integrations, Retrieval Augmented Generation, Vector Database, machine learning, and LLM Prompt Engineering.
I also collaborate with teams as a saas designer, contributing to product structure and usability, and can support product presentation through saas demo video creation when needed.
✅ What you get working with me
Clean, well-structured code and scalable architecture. As a SaaS developer, I focus on long-term product success. As a web application developer, I deliver solutions aligned with real business needs and support developing and maintaining the application and optimizing performance within an existing Ruby on Rails project.
🔹 Proven real-world impact
I helped scale a startup product to nearly 1,000,000 users, shaping my approach to performance and reliability. I’ve also worked on systems requiring high data integrity and integrations across multiple services using PostgreSQL, Redis, MySQL, SQL, Firebase, Heroku, Amazon web services, and DevOps practices.
🏆 9+ years as a Ruby on Rails Developer with 150+ software products delivered
🚀 SaaS Developer | 26+ platforms bіuilt & scaled
💻 Web Application Developer | helped scale a startup product to nearly 1,000,000 users, shaping my approach to performance and reliability.
⭐️ Top Rated | 100% Job success score | 5-star reviews only
💰 $10K+ earned on Upwork | 5,000+ hours worked on different projects
🤖 15+ AI Products Delivered | Agents, RAG & Automation Systems
🔗 110+ Integrations built | Stripe, Shopify, OpenAI, Twilio & more
🌍 Clients across 9+ countries | Long-Term Partnerships & Repeat Business
🔒 Production-Ready Solutions | Secure, Scalable & Maintainable Code
Experienced as a Rails + React Developer, Ruby on Rails architect, Senior Ruby on Rails Developer, senior Rails Developer, Ruby on Rails engineer, Full-stack web developer, and senior full-stack Ruby on Rails engineer with a strong background in Ruby on Rails.
🤝 Let’s build something solid
If you’re looking for a Ruby on Rails developer who understands SaaS products, a full stack developer who sees the entire system, or a react developer who values real user experience — let’s talk.
Steps for completing your project
After purchasing the project, send requirements so Ihor can start the project.
Delivery time starts when Ihor receives requirements from you.
Ihor works on your project following the steps below.
Revisions may occur after the delivery date.
Candidate Review
I review CV, GitHub, and background before the interview.
Technical Interview (30–60 min)
Live call with your candidate including backend fundamentals, coding questions, system design, and architecture analysis.