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Kancho Baev
Verified Expert in Engineering
React Developer
Plovdiv, Bulgaria
Toptal member since November 14, 2022
Bio
Kancho is a senior full-stack developer with nine years of experience specializing in React, TypeScript, and Node.js. He builds scalable web applications, crypto trading platforms, and AI-powered interfaces. With expertise in Next.js, GraphQL, Redux, Web3, and dynamic UI systems, he delivers pixel-perfect implementations across medical, financial, and enterprise sectors. He's a former front-end team lead passionate about clean code and innovative solutions.
Portfolio
KPMG
React, TypeScript, Next.js, Tailwind CSS, AI Integration, Markdown...
Recharge Capital
NestJS, Next.js, GraphQL, Tailwind CSS, Shadcn, Microservices, React...
Next Stream EOOD
React, TypeScript, Redux, React Hook Form, Styled-components, Context API...
Experience
- JavaScript - 8 years
- React - 8 years
- Redux - 8 years
- Node.js - 5 years
- Express.js - 5 years
- TypeScript - 5 years
- NestJS - 2 years
- Next.js - 2 years
Preferred Environment
JavaScript, React, Node.js, TypeScript, NestJS, Express.js, Next.js, GraphQL, Ethers.js
The most amazing...
...project I've developed dynamically loads site routes and components based on user roles and configurations, creating a unique experience for each user.
Work Experience
Senior React Developer
2025 - 2025
KPMG
- Architected and developed an enterprise AI chat application as sole front-end developer, implementing agent-based conversational interfaces with real-time interaction capabilities similar to Claude's interface.
- Implemented multi-language syntax highlighting with customizable color schemes within a markdown-powered chat interface, supporting diverse programming languages and visual preferences for both dark and light themes.
- Built a dynamic theming system with real-time configuration updates for colors, spacing, typography, and branding, enabling persistent custom theme storage and white-label customization.
- Developed artifact preview system with separate display sections, allowing users to interact with generated code, diagrams, and formatted content in dedicated viewer panels.
- Engineered feature-toggle architecture enabling granular control over UI components based on configuration, allowing flexible component visibility across different deployment environments.
Technologies: React, TypeScript, Next.js, Tailwind CSS, AI Integration, Markdown, Syntax Highlighting, Dynamic Theming, Feature Toggles
Full-stack Developer
2023 - 2025
Recharge Capital
- Architected and developed a comprehensive crypto trading platform enabling users to buy, trade, loan cryptocurrency, and manage positions with cross-chain migration capabilities.
- Transformed complex financial interface designs into pixel-perfect, responsive UI implementations using Next.js and Tailwind CSS, ensuring optimal user experience across all devices and screen sizes.
- Engineered smart contract interactions using ethers.js and web3.js, implementing transaction signing, wallet connections, and gas optimization for seamless blockchain operations.
- Developed real-time blockchain monitoring systems with event listeners to synchronize on-chain activities (liquidity, trading, positions) with database states, ensuring data consistency across the platform.
- Designed and implemented complex front-end state management using Redux Toolkit and React Query to handle real-time market data, user portfolios, and transaction states.
- Built scalable microservices architecture with specialized NestJS services, implementing domain-specific database solutions (MongoDB, PostgreSQL) and GraphQL APIs with Apollo Federation for efficient data exchange.
- Created responsive, interactive charts and trading interfaces with advanced visualization components, enabling users to analyze market trends and execute informed trading decisions.
Technologies: NestJS, Next.js, GraphQL, Tailwind CSS, Shadcn, Microservices, React, TypeScript, Apollo, Redux Toolkit, React Query, Ethers.js, Web3.js, Ethereum Smart Contracts, MongoDB, PostgreSQL, Prisma, Full-stack Development, Vercel
Front-end Team Lead
2020 - 2023
Next Stream EOOD
- Developed a dynamic permission-based system enabling TV companies to customize UI access by department and user group, controlling route visibility, page layouts, and component rendering based on granular permissions.
- Engineered a role-based rendering architecture where multiple users accessing identical routes would see different components, interfaces, and theme colors based on their department assignments and permission configurations.
- Built a robust admin configuration interface allowing TV company administrators to define department-level access controls and specify user-group permissions for routes, pages, and individual components.
- Developed modular, scalable architecture enabling dynamic loading of pages and components based on user configuration, creating an adaptive platform serving diverse organizational structures.
- Implemented comprehensive order management, invoice generation, advertising campaign creation, and reporting systems tailored to the TV broadcast industry's specific needs.
- Led team collaboration, providing accurate development estimates, managing competing priorities, and ensuring timely delivery while maintaining high code quality standards.
- Mentored team members through code reviews, technical guidance, feedback sessions, and training, fostering professional growth and maintaining high engineering standards.
Technologies: React, TypeScript, Redux, React Hook Form, Styled-components, Context API, Team Leadership, Code Review, System Architecture, Figma to React
React Developer
2018 - 2020
NETSYNO Software
- Migrated legacy JavaScript applications to modern React architecture, implementing hooks and functional components to improve maintainability and performance.
- Adopted TypeScript across projects, introducing type safety and reducing runtime errors while improving developer experience and code documentation.
- Refactored existing codebases using SOLID design principles, creating readable, maintainable, and scalable code adhering to industry best practices.
- Implemented comprehensive Redux state management and Redux Forms for complex form handling across multiple applications.
- Built and maintained multiple solo projects from inception to deployment, taking full ownership of architecture decisions and implementation details.
- Improved code quality through design pattern implementation, code reviews, and documentation, establishing standards for future development.
Technologies: JavaScript, React, Redux, TypeScript, Redux Form, Context API, SOLID Principles, Code Refactoring, Figma to React
Junior Software Developer
2016 - 2018
3web
- Developed HelpKarma nonprofit donation platform enabling users to contribute to charities and individuals, implementing secure payment processing and donation flows with React.
- Built Humanitas Hospitals' internal management system for staff and patients, enabling test result access and doctor appointment scheduling; developed a mobile application with location-based doctor search and interactive maps.
- Contributed to multiple React and Node.js client projects, learning industry best practices and modern development workflows.
- Mastered JavaScript, React, and Node.js with Express, building a strong foundation in full-stack development.
- Adapted to team-based development, learning collaboration, code review processes, and Agile/Scrum methodologies.
- Gained server management experience, deploying updates to production environments and maintaining live applications.
- Worked with diverse JavaScript libraries and frameworks, developing versatility across different technology stacks.
Technologies: JavaScript, React, Node.js, Express.js, MongoDB, Electron, TypeScript, Full-stack Development
Experience
AdSuite
An ad operation and client portal solution for traditional and digital-first publishers. Its modules accelerate order management, in-flight management, reporting, invoicing, and billing for cross-platform publishers. It is integrated with Google Ad Manager, Salesforce, Oracle Enterprise Resource Planning (ERP), and other leading industry platforms. Also, it supports both traditional and digital publisher media.
Skills
Libraries/APIs
React, Node.js, React Query, Web3.js, React Hook Form, Context API, Redux Form
Tools
Git, React Apollo, Shadcn, Redux Toolkit, Prisma
Languages
JavaScript, TypeScript, GraphQL, XML, Markdown
Frameworks
Express.js, Redux, NestJS, Next.js, Electron, Tailwind CSS
Platforms
Vercel, Blockchain
Storage
MongoDB, PostgreSQL
Paradigms
Microservices, Code Refactoring
Other
Figma to React, Web3, Tailwind UI, Ethers.js, Apollo, Ethereum Smart Contracts, Styled-components, Team Leadership, Code Review, System Architecture, SOLID Principles, Full-stack Development, AI Integration, Syntax Highlighting, Dynamic Theming, Feature Toggles
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