Project Overview

A modern fintech payment orchestrator, hosted on AWS, integrates multiple payment service providers into one unified system. This platform ensures high security, scalability, and performance while streamlining transaction flows and managing compliance. Built with Node.js, TypeScript, NestJS, and using MongoDB and PostgreSQL for storage, the system is containerized with Docker and orchestrated using Kubernetes. For CI/CD, GitLab CI is employed, while ActiveMQ and NewRelic handle messaging and monitoring.

Responsibilities

• Enhancing security and performance
• Optimizing system efficiency
• Refactoring legacy code for modernization
• Collaborating with cross-functional teams
• Developing server-side functionality
• Code performance optimization
• Conducting code reviews
• Managing builds, deployments, and collaborating with DevOps
• Estimating tasks and project efforts
• Providing support for existing functionalities and bug fixes
• Writing unit and integration tests
• Adhering to Scrum practices

Tools & Technologies

• Backend: Node.js, TypeScript, NestJS
• Databases: MongoDB, PostgreSQL
• CI/CD & Version Control: GitLab, GitLab CI
• ORM & ODM: TypeORM, Mongoose
• Testing Frameworks: Mocha, Chai, Jest
• Containerization & Orchestration: Docker, Kubernetes
• Messaging & Monitoring: ActiveMQ, NewRelic

• Project Role: Senior Software Engineer
• Project Team Size: 7 members (sub-team)

Project Overview

This portal offers users a wide selection of real estate properties with powerful search and filtering capabilities. It includes email notifications for new listings and integrates with Google Maps for an enhanced user experience. Hosted on AWS, the system uses a microservices architecture, incorporating services like EC2, RDS for PostgreSQL, S3, SQS/SNS, Cognito, Elasticsearch, and Lambda. Integration with Salesforce CRM ensures efficient user synchronization between the website and CRM.

Responsibilities

• Collaborating with development teams to ensure high-quality solutions
• Designing and implementing server-side functionality
• Architecting and developing microservices
• Refactoring code to enhance performance
• Performing code reviews
• Managing builds and deployments with DevOps
• Providing effort estimates for tasks and features
• Engaging with customers, conducting demos, and gathering feedback
• Maintaining functionality through bug fixes
• Writing unit and integration tests
• Following Scrum standards in Agile processes

Tools & Technologies

• Backend: Node.js, TypeScript, InversifyJS, TypeORM
• Testing: Mocha, Chai, Sinon
• DevOps: Jenkins, Docker, Docker Compose
• Database: PostgreSQL
• AWS: EC2, S3, SQS/SNS, Lambda, Elasticsearch, CloudWatch, Cognito
• Salesforce Integration: Apex, REST API

• Customer: A US-based company
• Project Role: Senior Software Engineer
• Project Team Size: 16 members

Project Overview

The Corporate Merger Management System (CMMS) is a private, enterprise-level platform designed to simplify and streamline the process of corporate mergers. The system provides a centralized workflow, allowing organizations to efficiently manage the stages of the merger, from initiation to completion. It features a detailed tracking system, pre-configured steps, and intuitive data visualizations through various charts and graphs. The platform also integrates automated alerts for key dates, events, and deadlines to ensure timely and successful merger execution.

Responsibilities

• Leading a team of four backend engineers, ensuring seamless collaboration and high productivity
• Working closely with the customer and business analysts to gather, refine, and document requirements
• Developing and optimizing backend functionality to align with project specifications
• Designing and implementing a scalable, high-performance database architecture
• Managing user authentication and authorization processes
• Establishing the initial architecture and framework for the project
• Refactoring existing code to enhance maintainability, scalability, and performance
• Performing rigorous code reviews to maintain quality standards and best practices
• Collaborating with the DevOps team to manage build, deployment, and CI/CD pipelines
• Providing accurate estimations for project features, tasks, and overall timelines

Tools & Technologies

• Backend: Node.js, TypeScript, Hapi, Sequelize
• Database: PostgreSQL
• DevOps: CircleCI, Kubernetes, Docker, Docker Compose
• AWS: S3, SQS/SNS

• Customer: US-based company specializing in corporate mergers
• Project Role: Team Lead / Senior Software Engineer
• Project Team Size: 12 team members

Project Overview

This project was developed for the world’s largest online tech and creative library, offering instant access to over 5,000 training courses, with new content added daily. The platform serves developers, IT administrators, and creative professionals, providing training delivered by renowned industry experts.

The system architecture employs multiple bounded contexts communicating through RabbitMQ and internal APIs. Each context manages specific sub-projects and responsibilities. My primary focus was the context responsible for course publishing. This includes a dashboard designed for the publication team to efficiently manage course metadata, create modules, upload media files, and handle course status and publication.

The architecture incorporates microservices written in Node.js and PHP, integrating third-party services such as AWS, Dropbox, Slack, Pusher, and RabbitMQ.

Responsibilities

• Leading and mentoring a team of three engineers to ensure high-quality deliverables
• Collaborating with customers to gather, clarify, and document requirements
• Designing the system architecture and breaking tasks into manageable components
• Developing and maintaining core system components
• Coordinating with the onsite team and clients to ensure alignment on project goals
• Implementing server-side functionality for the course publishing workflow
• Creating and maintaining detailed technical documentation
• Refactoring code to enhance performance and maintainability
• Writing and maintaining unit and integration tests
• Conducting code reviews to uphold high-quality standards
• Managing build and deployment pipelines
• Participating in interviews to expand the team with qualified engineers

Tools & Technologies

• Backend: Node.js (ES6, Promises, Async/Await), FeathersJS, Sequelize
• Testing: Mocha, Chai, Sinon, Codeception, AspectMock
• Additional Technologies: PHP, Yii2, Active Record, PostgreSQL
• Third-party Integrations: AWS (SQS, S3), Dropbox, Slack, Pusher, RabbitMQ

• Customer: US-based company specializing in online education
• Project Role: Team Lead / Software Engineer
• Project Team Size: 14 members

Project Overview

The Oil Market Insights Platform is an advanced system developed to assist companies in analyzing the oil market effectively. The platform integrates with a private API to generate extensive news, alerts, and data, which is visualized through interactive graphs and presented in a user-friendly feed format.

Additionally, the system offers an online chat feature, allowing seamless communication between users and companies. This functionality enhances user experience by providing real-time collaboration and data sharing.

Responsibilities

• Developing backend functionality to support core system features
• Building and enhancing UI components for improved user experience
• Writing and maintaining unit tests to ensure code reliability
• Refactoring and optimizing the system's architecture for better performance and maintainability
• Creating custom NPM and BASH scripts to automate CI server processes
• Setting up and maintaining a development environment using Vagrant
• Conducting software design, research, and analysis to improve system functionality

Tools & Technologies

• Backend: Node.js, PHP (Express, Phalcon, SlimPHP)
• Frontend: JavaScript, Ajax, HTML, CSS, JSON, XML, Bootstrap, Stylus
• Build Tools: Grunt
• Testing: PHPUnit, Mocha, Chai, Phantom.js
• Frameworks and Libraries: Require.js, Backbone.js, Lodash.js
• Development Environment: Vagrant, Chef-Solo
• Database: MySQL
• Web Server: Apache

• Customer: Ukraine-based company specializing in the oil market
• Project Role: Software Engineer
• Project Team Size: 4 members