Leonid – React, Typescript, AI agent development

• A web application for coordinating crew and passenger travel in business aviation. It supported hotel bookings, ground transportation, travel itinerary management, and updates caused by changes in flight schedules.
• A financial operations application for managing trip-related expenses, customer billing, invoice preparation, expense review, reporting, payment tracking, and month-end financial workflows.
• A specialized staffing platform for the business aviation industry. It connected operators with pilots, crew members, and other aviation professionals for temporary assignments, part-time work, and permanent positions.
• An owner-facing portal that provided aircraft owners with access to flight activity, operational data, expenses, financial reports, documents, and other aircraft-related information in one place.
• An operational planning application for optimizing aircraft and crew schedules. It considered aircraft availability, crew availability, maintenance, training requirements, relocation costs, operational constraints, and configurable business rules.
• A data integration and reporting solution that consolidated information from flight scheduling, accounting, maintenance, and expense-management systems into unified operational and financial workflows.

• Led frontend architecture and delivery across multiple frontend engineers.
• Owned frontend roadmap, technical risk assessment, project structure, coding standards, review practices, and delivery quality across multiple projects.
• Standardized frontend structure, tooling, and reusable patterns across 5 projects, reducing onboarding friction and making engineer rotation easier.
• Built and evolved a Storybook-based component library for a main project, reducing duplicated UI patterns and improving consistency.
• Expanded Typescript adoption in a legacy JavaScript codebase and created incremental migration patterns that improved maintainability and refactoring safety.
• Improved build and deployment workflows through frontend tooling, CI/CD, and process optimization.
• Reduced production risk in new frontend work by replacing fragile legacy patterns with standardized reusable components and flows.
• Used Node.js and automation-oriented tooling to support frontend delivery, developer workflows, and integration-heavy product work.
• Applied daily AI-assisted engineering workflows for prototyping, refactoring, documentation, and exploratory changes while retaining ownership of final implementation quality.
• Supported teammates with technical and personal questions.
• Created frontend process documentation.
• Built frontend processes and communication with other teams.
• Developed, maintained, and refactored the main company project.
• Managed frontend team tasks.
• Onboarded new developers.
• Maintained CI/CD configuration.

Banking Domain

Worked on an internal CRM-style web application used by bank employees to manage customer and operational workflows.

The work included modernizing an existing React application, improving its architecture and performance, implementing a redesigned interface based on a new design system, migrating older frontend patterns, and setting up automated end-to-end testing foundations for QA.

• Modernized a banking React application and improved structure, performance, and developer experience.
• Set up Puppeteer and Jest end-to-end testing for QA.
• Created and modified application core.
• Shared best practices with the team.
• Conducted interviews.
• Set up CI/CD frontend builds with Jenkins.
• Rebuilt and updated an application previously written by full-stack developers with basic React knowledge.
• Shared frontend best practices for the full-stack team.
• Created and set up React application core for another team in the same account.

Travel Domain

Worked on a customer-facing travel aggregation platform that allowed users to search, compare, and explore tours, travel packages, and related services from multiple providers.

The project involved migrating a legacy Angular and jQuery application to React and Next.js, introducing Apollo and GraphQL, defining the frontend architecture, and building reusable components for the new platform.

Responsibilities:

• Led frontend migration from legacy Angular/jQuery to React/Next.js with Apollo and GraphQL, defining frontend architecture and shared components.
• Worked across frontend architecture, customer-facing migration planning, Node.js/Express-related integration work,
• Created and modified application core.
• Shared best practices with the team.
• Discussed with the customer and implemented global application changes.
• Managed frontend team tasks.
• Conducted interviews.
• Set up CI/CD frontend builds with Jenkins.

A legacy web product and companion desktop application used for operational workflows. The work included gradual frontend modernization and migration of browser-extension functionality into a standalone desktop application.

• Developed new functionality and maintained an existing Backbone-based web application.
• Gradually migrated application areas from Backbone to Vue.js, improving maintainability and user experience.
• Migrated a Chrome extension into an Electron desktop application.
• Implemented desktop application packaging and automatic update workflows using Electron Forge.