Dmytro – Node.js, Typescript, JavaScript, experts in Lemon.io

Dmytro

From Czech Republic (UTC+3)flag

Full-stack Web Developer|Senior

Dmytro – Node.js, Typescript, JavaScript

Dmytro is a senior full-stack developer with a strong focus on backend and AI, experienced in React, Node.js, Vercel, LangChain, and LangGraph. He has led teams and delivered projects in web3, e-commerce, fintech, and betting aggregation. His background includes multi-agent AI systems, vector databases, and architecture setup from scratch. English communication is upper intermediate, and he is comfortable in both independent and team roles.

5 years of commercial experience in
AI
Analytics
Blockchain
Data analytics
Marketing
Networking
Social media
Sports
Telecommunications
B2B
Content creation and licensing
Marketplace
Identity verification software
Mobile apps
SaaS
Virtual assistants
Web3
Web development
Main technologies
Node.js
4 years
Typescript
4 years
JavaScript
1 year
React
4 years
AI
2.5 years
LangGraph
1 years
Additional skills
Nest.js
WebSocket
OpenAI API
Prompt engineering
Vercel
Prettier
PostgreSQL
AI agent development
Redux
Redis
OAuth
Tailwind CSS
Next.js
Azure SQL
Azure Functions
Playwright
e2e testing
AWS Lambda
FastAPI
AWS
REST API
CrewAI
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Experience Highlights

Full-Stack Developer
Nov 2025 - Ongoing9 months
Project Overview

A decentralized telecom verification network that utilizes a global fleet of mobile devices to generate verifiable network performance proofs. The platform allows users to contribute their device's connectivity data to a decentralized network in exchange for rewards, creating a transparent map of global telecom performance. Key features include a mobile node application with native hardware integration, a web management dashboard for network monitoring, and a Web3-integrated verification system for blockchain-based performance proofs.

Responsibilities:
  • Focused on creating seamless integration between mobile devices and cloud services.
  • Built the mobile app and web dashboard on a Supabase backend, optimizing SQL queries and RPCs for efficient handling of large-scale network data.
  • Managed real-time database subscriptions to ensure up-to-date information across clients.
  • Developed custom Native Modules in Kotlin and Swift to capture detailed network metrics from devices. D
  • elivered core features including the chat system and push notifications, while automating deployment pipelines with EAS and GitHub Actions for reliable and fast releases.
Project Tech stack:
React Native CLI
Supabase
PostgreSQL
Firebase
Twilio API
Tech Lead
Jun 2025 - Ongoing1 year 2 months
Project Overview

A B2B SaaS platform that streamlines software and partner discovery through AI-powered capabilities and advanced search mechanisms. It also functions as a lead generation platform, enabling software vendors and partners to identify and connect with relevant customers.

Responsibilities:
  • Led a team of 6 people and owned end-to-end architecture and delivery of the platform across frontend, backend, and infrastructure.
  • Designed and implemented the dual search architecture (fuzzy + exact search and AI-driven semantic search), including vector search integration with Qdrant and AI pipelines using OpenAI, Google GenAI, and LangChain.
  • Defined system design standards, data modeling strategy, and API contracts.
  • Established scalable background processing with BullMQ and Redis, and implemented observability using Prometheus, Grafana, and structured logging with Pino.
  • Owned DevOps setup, CI standards, and code quality enforcement. Coordinated technical decisions, reviewed code, and ensured performance, reliability, scalability and maintainability of the platform.
Project Tech stack:
Next.js
Zustand
Nest.js
PostgreSQL
AI agent development
LangChain
Qdrant
Full-Stack AI Developer
Feb 2025 - Sep 20257 months
Project Overview

A mobile application that aggregates odds across multiple sportsbooks and sports, with a primary focus on soccer. Its core feature was a personal betting assistant called Clutch, which interacted with users about matches and players, and supported decision-making through a custom prediction model.

Responsibilities:
  • Primarily responsible for the design and development of Clutch, the AI betting assistant.
  • Architected and implemented a multi-agent system where specialized agents handled match retrieval, player analysis, contextual reasoning, and decision support.
  • Focused on response reliability, consistency, and maintaining a stable conversational tone aligned with the defined “buddy” persona.
  • Integrated LLM workflows using Vercel AI SDK, OpenAI, and LangSmith, and ensured predictable behavior through structured prompting and orchestration logic.
  • Contributed to odds aggregation services and implemented integration of Clutch with the React Native mobile application.
Project Tech stack:
React Native CLI
tRPC
Express.js
Redis
AI agent development
OpenAI
Team Lead
Jan 2024 - Apr 20251 year 2 months
Project Overview

A platform that enables users to manage their social media profiles—primarily X (formerly Twitter) and Instagram—through a multi-agent AI system. Users can enable or disable specific agents, such as engagement, research, and content-writing agents, to control automation granularity. The system manages profiles end-to-end, including post creation, comment responses, and performance analytics. It targets social media managers, influencers, and businesses seeking AI-driven profile management.

Responsibilities:
  • Led a team and developed both frontend and backend systems, including the web interface and backend APIs.
  • Designed and implemented Python microservices powering the AI agents for content creation, engagement, and analytics.
  • Integrated agent orchestration to allow granular control over automation.
  • Developed real-time dashboards for post and engagement tracking, and ensured reliable scheduling and execution of AI-driven tasks.
  • Optimized system performance for handling multiple profiles and high-frequency interactions, while maintaining consistent user experience and AI behavior.
Project Tech stack:
React
Nest.js
PostgreSQL
OpenAI API
Python
CrewAI
LangChain
Full-Stack Developer
Jun 2023 - Jan 20247 months
Project Overview

An email marketing platform that enables users to create rich, interactive email campaigns. Users can include text, images, voting blocks, charts, and other dynamic content. The platform tracks engagement using pixels, collecting data on if, when, and where recipients opened emails, allowing detailed analytics and insights. It targets marketers and businesses seeking data-driven email campaigns.

Responsibilities:
  • Developed both frontend and backend systems to support campaign creation and management.
  • Built a rich email editor for customizable templates and ensured efficient handling of large data objects.
  • Implemented engagement tracking and analytics pipelines to monitor email interactions.
  • Optimized performance and reliability for high-volume campaigns, delivering a robust, full-stack solution.
Project Tech stack:
React
Typescript
Redux Toolkit
Fabric
Express.js
PostgreSQL

Education

2025
International economic relationships
Bachelor

Languages

English
Advanced

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