Roman K. — Full-Stack Software Engineer

Automated Futures Trading System for Binance - Full-Stack Developer

Duration: Sep 2023 – Present

Technologies: Node.js (Fastify), TypeScript, WebSocket Streams, Prisma ORM, PostgreSQL, Binance Futures API, Docker, AWS EC2, Terraform, Nginx, Certbot, DuckDNS

About the project: Fully automated cryptocurrency trading system for Binance Futures featuring custom trading algorithms based on moving average strategies, real-time market data processing via WebSocket streams, and order execution with the Binance API. Includes secure, cost-efficient cloud deployment using Docker, AWS EC2, Terraform, and automated SSL provisioning.

Responsibilities:

• Solely designed, developed, and deployed the system from scratch to production
• Implemented trading logic with MA-based entry/exit rules and position management
• Integrated Binance WebSocket streams for low-latency market data handling
• Developed REST APIs with Fastify for monitoring and administrative control
• Designed Dockerized deployment and automated infrastructure provisioning with Terraform
• Configured secure HTTPS access via Nginx, Certbot, and DuckDNS
• Optimized AWS costs with ephemeral infrastructure and persistent S3 backups

Mobile App with AWS Amplify - Full-Stack Developer

Duration: Sep 2023 – Present

Technologies: React Native (Expo), React.js, TypeScript, AWS Amplify, AWS Cognito, OAuth (Apple, Google), AWS S3, AWS CloudFront, Fastify, Node.js, Docker, Nginx, Certbot, Tailwind CSS, Styled Components

About the project: Cross-platform application (iOS, Android, Web) with secure user authentication via AWS Amplify and Cognito, supporting native username/password and federated login via Apple and Google. Includes custom video playback module with engagement tracking and real-time chat interface. Web version deployed through AWS S3 and CloudFront with automated SSL provisioning.

Responsibilities:

• Solely designed, developed, and deployed the platform from initial concept to production
• Set up and configured AWS Amplify environments (staging, dev, test) with Cognito User Pools and Identity Pools
• Integrated Apple and Google sign-in via Amplify federated authentication
• Resolved Amplify CLI environment/App ID mismatches, ensuring correct backend synchronization
• Managed OAuth redirect URIs for iOS/Android, including Expo deep linking configuration
• Implemented custom video player with evaluation logic for engagement and playback tracking
• Developed real-time chat bubble interface with optimized rendering in React Native
• Deployed Expo Web build to AWS S3 with CloudFront CDN for global, low-latency access
• Designed reusable UI component system with Tailwind CSS and Styled Components

Exercise Buddy - Full-Stack Developer

Duration: Sep 2023 – Present

Technologies: TypeScript, Koa.js, React.js, Node.js, GraphQL, AWS DevOps, PostgreSQL, Docker, React Native, Nginx

Responsibilities:

• Code maintenance and project support
• Adding new features and bug fixing

Conversational AI Chatbot - Full-Stack Developer

Duration: Jan 2025 – Mar 2025

Technologies: Voiceflow, Node.js, TypeScript, Express.js, REST API, MongoDB, AWS Lambda (Serverless), Webhooks

About the project: Proof-of-concept conversational AI chatbot on the Voiceflow platform for e-commerce, enabling automated handling of customer queries (order status, product availability, FAQ). Features multi-turn dialogue flows with context management, integrated with a Node.js backend for dynamic data retrieval.

Responsibilities:

• Designed and implemented dialogue flows with branching logic and contextual memory in Voiceflow
• Developed Node.js microservices to connect the chatbot with a mock e-commerce database
• Integrated Voiceflow flows with backend APIs using webhooks for real-time responses
• Deployed serverless functions (AWS Lambda) for scalability and cost efficiency
• Prepared demo and documentation for client presentation

ID-Veritas - Full-Stack Developer

Duration: Aug 2022 – Sep 2023

Technologies: TypeScript, Angular, Bootstrap, Loopback.js, Azure DevOps, Nginx

Responsibilities:

• Developed new features
• Designed project architecture solutions
• Conducted code review, refactoring, and maintenance
• Configured deployment pipelines and CI/CD
• Implemented security processes
• Proposed technical and functional improvements

P.R.I.S.M Consortium (Hardware Erasure) - Full-Stack Developer

Duration: Feb 2022 – Aug 2022

Technologies: TypeScript, Node.js, xml2js, Azure Functions, Azure Logic Apps, Azure Vault, NetSuite, Azure SQL, custom erasure pipeline engine

Responsibilities:

• Developed new features
• Designed project architecture solutions
• Developed REST APIs
• Refactored and maintained code
• Integrated third-party libraries

Travel Technology Practice (Luxury Property Rental) - Back-End Developer

Duration: Apr 2021 – Feb 2022

Technologies: TypeScript, NestJS, PostgreSQL, TypeORM, Swagger, MJML, Webflow API

Responsibilities:

• Developed new features and wrote unit tests
• Worked with PostgreSQL databases: schema design, querying, and data manipulation
• Designed and implemented RESTful APIs
• Integrated backend with Booking.com API, configuring connectivity and ensuring stable data exchange
• Integrated backend data with Webflow-based marketing pages, setting up custom API endpoints for dynamic content and optimizing page load performance through API response caching

Betting Platform - Full-Stack Developer

Duration: Oct 2020 – Jun 2022

Technologies: TypeScript, React.js, Redux, MobX, Express.js

Responsibilities:

• Developed new features and created components
• Developed REST APIs
• Refactored and maintained code
• Reviewed teammates' code
• Worked with third-party libraries and sources: Betradar, IMG, Perform, and AWS

Music Industry Services for Spotify Musicians - Full-Stack Developer

Duration: Feb 2020 – Sep 2020

Technologies: React.js, Redux, Express.js, Sequelize

About the project: Platform providing various services to Spotify musicians and singers.

Responsibilities:

• Refactored and improved existing code
• Wrote business logic for the application
• Created, designed, and managed databases
• Developed UI components
• Fixed application bugs

Forex Currency Exchange Platform - Front-End Developer

Duration: Apr 2019 – Jan 2020

Technologies: React.js, Redux

About the project: Platform providing users with data from Forex.

Responsibilities:

• Developed user interface
• Designed user interactions on web pages
• Ensured cross-platform optimization for mobile devices

Various Upwork Projects - Full-Stack Developer

Duration: Sep 2017 – Mar 2019

Technologies: React.js, Redux, Node.js, Express.js, GraphQL, PostgreSQL, MySQL, MongoDB

Responsibilities:

• Developed functionality and components
• Fixed bugs
• Designed user interactions on web pages
• Developed backend applications
• Created servers and databases
• Ensured responsiveness of applications

E-commerce Websites and Promo Pages - Full-Stack Developer

Duration: Feb 2015 – Feb 2016

Technologies: HTML, CSS, JavaScript, PHP, Laravel, MySQL, jQuery, Git

About the project: Full cycle development of e-commerce websites and adaptive promo pages. Created SPA applications using jQuery on front-end and Laravel on back-end.

Responsibilities:

• Created responsive layouts
• Ensured cross-browser and cross-device compatibility
• Rendered data from back-end using AJAX requests and templates