You will get Estimate for MVP/SaaS project Node.js | React | Express | AI integration
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Project details
PLEASE DO NOT ORDER BEFORE HAVING A DISCUSSION.
With us YOU will get a professional technical estimate directly from an experienced CTO and his engineering team. We specialize in full-stack development using React, Node.js, TypeScript, PHP, Python, and AWS, helping startups and enterprises turn complex ideas into reliable, scalable products.
You’ll receive a detailed project evaluation based on real engineering logic, not guesses. We’ll break down your scope, highlight technical risks, propose architecture options, and give you realistic delivery timelines and cost estimates.
Our clients appreciate our clarity, speed, and high-quality execution. Expect productive collaboration, transparent communication, and a team that treats your product like their own.
Whether you’re building a SaaS platform, MVP, marketplace, or enterprise solution, we’ll help you plan it right from day one.
Thanks,
Sergey Koval
CTO at Rezet team
With us YOU will get a professional technical estimate directly from an experienced CTO and his engineering team. We specialize in full-stack development using React, Node.js, TypeScript, PHP, Python, and AWS, helping startups and enterprises turn complex ideas into reliable, scalable products.
You’ll receive a detailed project evaluation based on real engineering logic, not guesses. We’ll break down your scope, highlight technical risks, propose architecture options, and give you realistic delivery timelines and cost estimates.
Our clients appreciate our clarity, speed, and high-quality execution. Expect productive collaboration, transparent communication, and a team that treats your product like their own.
Whether you’re building a SaaS platform, MVP, marketplace, or enterprise solution, we’ll help you plan it right from day one.
Thanks,
Sergey Koval
CTO at Rezet team
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Security, DesignWhat's included
| Service Tiers |
Starter
$500
|
Standard
$750
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 3 | 5 |
Design Customization | |||
Content Upload | - | - | - |
Responsive Design | - | ||
Source Code |
23 reviews
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SD
Shelomo D.
Oct 25, 2024
Full Stack Developer
Working with Sergey has been a great experience. His commitment and professional attitude ensure that every project is done well and on time. Sergey consistently provides clear and organized ideas, which improve our teamwork and lead to excellent outcomes. His skill in aligning with our goals makes him an essential partner. I highly recommend Sergey and can't wait to collaborate with him again.
SD
Shelomo D.
Jan 11, 2023
Fullstack Developer
Sergey has shown excellent technical skills and a solid understanding of software development principles. Their coding is clean and well-organized, with a focus on maintainability and scalability. He works well in a team, and are able to effectively communicate and collaborate with other team members. He has also shown a strong ability to learn new technologies and adapt to changing requirements.
YB
Yonatan B.
May 31, 2021
Full Stack | React & Node.js
Sergey is an absolute asset. Dedicated, communicative and highly professional developer. It was a pleasure working with him for so long. We hope to extend our work in future projects. We highly recommend Sergey as a full stack developer.
YB
Yonatan B.
Nov 30, 2020
Full Stack Needed | React & Node.js
Sergey has proved himself to be one of the best developers we ever worked with. Communication is great, execution is stellar and the quality of work is amazing. Would highly recommend hiring him for complex projects. Looking forward to our next project!
RS
Ruslan S.
Nov 2, 2020
Senior JavaScript Developer
Sergey is a responsible and professional developer who moved us to the next level in terms of code quality and architecture, thank you!
About Serhii
Full Stack Developer | SaaS Developer | Backend Developer | React.js
100%
Job Success
Zaporizhzhya, Ukraine - 7:45 pm local time
⭐️⭐️⭐️⭐️⭐️ "Working with Sergey has been a great experience. His commitment and professional attitude ensure that every project is done well and on time. Sergey consistently provides clear and organized ideas, which improve our teamwork and lead to excellent outcomes. His skill in aligning with our goals makes him an essential partner. I highly recommend Sergey and can't wait to collaborate with him again."
I'm a Full Stack Developer with 15+ years of experience in React, Node.js, Python, and AI SaaS development, helping startups and scale-ups ship production-grade web applications that users actually stick with. Whether you need a full stack developer react project or a python full stack developer for data-heavy backends, I've done both at scale.
🎯 What I bring to your product as a Full Stack Developer React Node.js AI SaaS:
✔️ Over 12 years of commercial full stack development experience across React, Node.js, TypeScript, Python, and AI SaaS products
✔️ A results-focused engineering approach: as a full stack developer react specialist, I architect applications that scale from MVP to 100K+ users without rewrites, saving clients 6+ months of refactoring.
✔️ As a React Developer, I build fast, accessible, component-driven frontends using React, Next.js, TypeScript, Redux, and Tailwind. My React code is tested, typed, and production-ready from day one.
✔️ As a Node.js Developer, I design scalable backend systems with Node.js, Express, NestJS, PostgreSQL, MongoDB, Redis, and AWS. I've shipped Node.js APIs handling millions of requests per month with sub-100ms response times.
✔️ As a python full stack developer, I build data pipelines, automation scripts, AI/ML integrations, and backend services using Python, FastAPI, Django, and Celery. Python is my go-to for anything AI, data, or automation-heavy.
✔️ As an AI SaaS Developer, I integrate OpenAI, Anthropic Claude, LangChain, vector databases (Pinecone, Weaviate, pgvector), and RAG pipelines into real SaaS products - not demos. Built 10+ production AI features generating measurable revenue.
✔️ Full stack SaaS expertise: multi-tenant architecture, billing (Stripe), auth (Auth0, Clerk), usage-based pricing. I've shipped 20+ SaaS products end-to-end.
✔️ Full Stack Developer with deep React + Node.js + AWS expertise: CI/CD, Docker, Kubernetes, serverless (Lambda), and observability (Sentry, Datadog). I ship fast and I ship clean.
✔️ As a full stack developer php specialist, I also handle PHP-based projects and legacy migrations. If you need a full stack developer php to modernize a WordPress, Laravel, or custom PHP codebase into React + Node.js, that's a transition I've done multiple times.
✔️ As a Full Stack Developer, I work directly with founders and CTOs. No middle layer, no account managers, no lost context. You talk to the engineer writing the code.
📊 My Achievements in Numbers:
🔶 Full Stack Developer for an AI-powered SaaS platform (React + Node.js + OpenAI):
▪ Shipped production AI assistant in 6 weeks from empty repo.
▪ Reduced user onboarding time by 70% with AI-driven setup flows.
▪ Cut support tickets by 45% through an AI knowledge-base integration.
🔶 Full Stack Developer React + Node.js for a Fintech SaaS application:
▪ Rebuilt legacy React frontend, improved Core Web Vitals by 3x.
▪ Migrated Node.js backend to NestJS + PostgreSQL, reduced infra costs by 40%.
▪ Delivered on-time for a regulated go-live with zero critical bugs post-launch.
🔶 Python Full Stack Developer for a B2B analytics product:
▪ Built RAG pipeline over 500K+ documents using LangChain and pgvector.
▪ Increased user retention by 2x through AI-generated insights.
▪ Shipped from prototype to paying customers in under 10 weeks.
Why should you hire me as a Full Stack Developer?
▪ 12+ years of experience in React, Node.js, Python, TypeScript, and AI SaaS Development
▪ 50+ SaaS products shipped end-to-end, from MVP to scale
▪ Expert in React, Next.js, Node.js, NestJS, PostgreSQL, AWS, OpenAI, LangChain
▪ CTO-level decision making on architecture, hiring, and technical trade-offs
▪ Direct communication with founders - no PM layer, no lost context
▪ Clean code, tested code, documented code. Production from day one.
▪ Hired as a full stack developer, full stack developer react, and python full stack developer across 50+ projects. Also worked as a full stack developer php on legacy migrations. Clients searching for a full stock developer, React Developer SaaS, Node.js Developer AI, AI SaaS Developer OpenAI, or React Node.js Developer TypeScript - this is exactly what I do daily.
Looking for a full stack developer who can actually ship production code, not just prototypes? Whether you need a full stack developer react, python full stack developer, or full stock developer - let's talk. ☎️
Steps for completing your project
After purchasing the project, send requirements so Serhii can start the project.
Delivery time starts when Serhii receives requirements from you.
Serhii works on your project following the steps below.
Revisions may occur after the delivery date.
You complete the project following the steps.
We will analyze your details, specification, business logic and prepare a detailed estimate according to your needs. You can also expect for 1 round of revision to fine-tune the final result.