Sergei C.

You don't need an agency. You need someone who understands what you're building.
$1M+ earned on Upwork · 100% Job Success · 11,800+ hours · 53 SaaS & AI products/projects shipped.
One client has invested $1M+ with me over 7 years. Another's $7K MVP became a $70K product.

I’m Sergei — a Senior SaaS & AI Engineer and Product Development Expert. I help founders turn product ideas, prototypes, and early-stage concepts into working SaaS products.

I can help whether you have:

• an idea that needs to become a prototype
• a prototype that needs to become an MVP
• an MVP that needs to become a production-ready product
• an existing SaaS that needs new features, modernization, or technical rescue
• an AI product that needs to move beyond a proof of concept

🏗️ Think Before You Build

My job is not just to write code.

Before development, I help you understand what should actually be built, what can wait, and which technical decisions will matter later.

We will look together at:

• product requirements and user workflows
• MVP scope and priorities
• SaaS architecture and scalability
• integrations and APIs
• AI/LLM capabilities
• security and infrastructure
• realistic development effort

The goal is simple: build the right product without creating an expensive technical dead end.

🚀 From Prototype to Production

I work hands-on with SaaS and AI products using:

• Backend: Python, FastAPI, Node.js, NestJS, Laravel
• Frontend: React, Next.js, Vue.js
• Data & Cloud: PostgreSQL, Redis, MongoDB, DynamoDB, AWS, GCP
• AI: OpenAI, Claude, LLM APIs, RAG, embeddings, vector databases, AI agents
• Infrastructure: Docker, Kubernetes, CI/CD

I can take responsibility for the technical implementation — from the first prototype through MVP and production.

🤝 You Work With Me Directly

I don’t disappear after the sales call and hand your product to someone you’ve never met.