Dmitry C.

Need a developer for your existing team, or a solo developer that can take care of your project end to end? Hi, I’m Dmitry and I build full-stack web applications with React, TypeScript, and Node.js, including backend APIs, third-party integrations, and AI features. I can join your existing team or take responsibility for a project from planning through deployment. ✅ My technical background • Development principles: Test-driven development (TDD), object-oriented programming (OOP), system architecture, SOLID principles, separation of concerns, reusable code, API-first design, security, code reviews, and agentic development with coding standards and feature-specific rules covering the entire codebase. • Frontend: HTML5, CSS3, JavaScript, TypeScript, React.js, Angular, Redux, React Hooks, Material UI, Bootstrap, Blueprint.js, responsive interfaces, state management, and API integration. • Backend: Node.js, Express.js, NestJS, REST APIs, GraphQL, Apollo, WebSockets, JWT authentication, webhooks, custom business logic, and third-party integrations. • AI development: Agency Swarm, CrewAI, AutoGen, LangGraph, AI agents, multi-agent orchestration, tool calling, workflow automation, and connecting agents to external APIs and business systems. • Databases: Firebase, Firestore, Realtime Database, NoSQL databases, database architecture, data modeling, Firebase Security Rules, Postgres, SQL fundamentals & migrations. • Cloud and deployment: Google Cloud Functions, AWS Lambda, AWS EC2, Firebase Hosting, Firebase Functions, Heroku, Railway, Digital Ocean. • Integrations and automation: Twilio, Google Maps, Airtable, HubSpot, CRM integrations, webhook-driven workflows, data synchronization, and custom API integrations. • Mobile: Expo, React Native, Android development with Java/Kotlin, Android Studio, Android SDK, XCode, Swift UI • Tools and collaboration: Git, npm, Yarn, Jira, debugging, application maintenance, and performance optimization. I’m comfortable working through the less visible parts of a product: backend architecture, complex business logic, database structure, and integrations that need to behave reliably. My AI work has also involved investigating production issues such as repeated tool executions and preventing duplicate actions. You can bring me an early idea, a defined scope, or an existing application that needs attention. I’ll help clarify the requirements, explain the technical options, and work through the implementation with you. Send me a message with what you’re building and where you need help.