10/14/2026 updated
100 % available
AI developer | PHP | Node.js | React | Web app
Dnipro, Ukraine
Only remote
Master of Science (Computer Science)About me
Full-stack developer (PHP, Node.js, React) building web apps with an AI-powered workflow: faster delivery, clean code, lower costs. I add AI features to products, automate processes and turn AI-generated code into production-ready apps. Fintech, SaaS, marketplaces. Let’s talk!
AI AgentsApplication DesignClean Code PrinciplesWeb InterfacesAdaptive DesignApplication Programming Interfaces (APIs)Artificial IntelligenceApp Store (IOS)Software as a ServiceCode ReviewWeb DevelopmentDjangoExchange-Traded FundPython (Programming Language)Mobile Commerce
Hi! I’m a Full-Stack Developer and CTO with 10+ years of experience building web apps, SaaS platforms, mobile apps and crypto products. Today I combine that experience with an AI-powered workflow, so you get faster delivery, clean code and lower costs, without compromising on quality.
What I can do for you:
- AI integration: adding AI to your product or business. Chatbots and AI assistants, smart search over your data (RAG), document processing, recommendations and process automation using OpenAI, Claude and other LLM APIs.
- AI-powered development: I use Claude Code and Codex in my daily work, which speeds up coding, testing and code review. Features ship faster, and the budget goes further.
- AI code rescue: taking over AI-generated or “vibe-coded” projects, fixing architecture and security gaps, and making them stable and production-ready.
- Web apps and SaaS: scalable products with React, Next.js, Vue, Node.js (NestJS, Express) and PHP (Laravel), with API integrations, dashboards and real-time analytics.
- Crypto and Web3: exchanges, wallets and payment solutions on Ethereum, Solana and BNB Chain, including smart contracts, wallet integration and real-time trading features.
- Mobile apps: React Native and Flutter apps with push notifications, maps and in-app purchases.
- Cloud and DevOps: secure, scalable setups on AWS, Google Cloud and Firebase with Docker and CI/CD.
Tech stack:
- AI: OpenAI API, Claude API, LangChain, RAG, vector databases, Claude Code, Codex
- Frontend: React, Next.js, Vue.js, Redux, TypeScript, Tailwind CSS
- Backend: Node.js (NestJS, Express), PHP (Laravel, Yii2), REST, GraphQL, Prisma
- Databases: PostgreSQL, MySQL, MongoDB, Redis
- Blockchain: Solidity, Web3.js, Ethers.js, Ethereum, Solana, BNB Chain
- Mobile: React Native, Flutter, Firebase
- DevOps: Docker, AWS, Google Cloud, GitHub, GitLab
- Payments: Stripe, PayPal
Why work with me?
As a CTO since 2017, I’ve led and scaled projects in fintech, blockchain, eCommerce, healthcare and SaaS. You get strong engineering, product thinking and clear, regular communication, plus a practical view of where AI actually saves you time and money, and where it doesn’t.
Whether you want to build a new product, speed up an existing one or bring AI into your business, let’s talk about your project.
Experience
Professional experience10+ years
Freelancer since2014
Languages
EnglishNative speaker
Project history
Peiko is a full-service information technology, UX/UI, and development agency. I believe that good design and development should be a team player with a solution-oriented approach. My team mainly focuses on Fintech, Blockchain (Exchanges, NFT, Wallets), SaaS, and Marketplaces. We help businesses to generate buzz and boost their growth with smart, creative, and innovative solutions.
Project: Gsdiamonds - diamond jewelry marketplace with a custom ring builder.
Technologies: CSS, HTML, Laravel, MySQL, PHP, React JS, Node JS.
Core achievements:
- Made it possible to process a large array of information: 150,000 items from several vendors, updated every 15 minutes;
- Built custom ring builder;
- Set up integration with Alipay, Paypal, and Adyen;
- Provided the opportunity to manage through the CRM/CMS almost any content on the site
- Online Calculator
Technologies: CSS, HTML, Laravel, MySQL, PHP, React JS, Node JS.
Core achievements:
- Made it possible to process a large array of information: 150,000 items from several vendors, updated every 15 minutes;
- Built custom ring builder;
- Set up integration with Alipay, Paypal, and Adyen;
- Provided the opportunity to manage through the CRM/CMS almost any content on the site
- Online Calculator
Marketplace for long-term renting.
Core achievement:
- Wayforpay integration (payment system)
- A sophisticated parser that looks at hundreds of objects, and copies information. This parser also monitors the relevance of apartments and automatically removes them if the apartment is occupied
- Multilevel filters
Tech Stack: PHP (Yii2), jQuery, React Js, MySQL, RestAPI
Core achievement:
- Wayforpay integration (payment system)
- A sophisticated parser that looks at hundreds of objects, and copies information. This parser also monitors the relevance of apartments and automatically removes them if the apartment is occupied
- Multilevel filters
Tech Stack: PHP (Yii2), jQuery, React Js, MySQL, RestAPI