Leonid Kuznetsov

Independent frontend / open-source work focused on React, TypeScript, reusable abstractions, component libraries, request flows, testing, CI/CD, npm publishing, and maintainable frontend infrastructure.

Published and maintain 4 npm packages with PR-based workflows and CI gates for formatting, linting, type checking, tests, builds, package validation, and releases.

Published open-source projects:

Frontend architecture contract focused on React / TypeScript architecture, technical debt, shared frontend abstractions, and authenticated application boundaries.

- Analyzed a complex React / TypeScript application with accumulated technical debt and proposed architecture improvements to simplify maintenance and future development.
- Built and refined shared frontend abstractions and reusable pat

Senior Frontend Developer / Senior React Developer working on an enterprise SaaS platform with dashboards, data-heavy tables, workflow screens, authentication flows, and scalable React / TypeScript applications.

- Built a configurable dashboard editor with drag-and-drop widgets, persistent layouts, dynamic configuration, and reusable UI patterns.
- Developed and evolved dashboards, data-heavy tab

Lead Frontend Engineer at Mail.ru Group / VK, working on marketing communications, campaign management, internal admin tooling, and HR workflow systems for a large-scale internet platform.

- Took ownership of a legacy JavaScript frontend for a marketing communications platform after previous developers left, stabilizing further development and modernization.
- Modernized a large React / Redux cod

Frontend Developer at Yandex, working on large-scale internal billing, payment, and business-support systems built with React / TypeScript.

- Migrated a large legacy XML/XSL internal application to React for business support workflows, payment checks, and service tracking.
- Investigated undocumented legacy logic across XML/XSL views, frontend code, backend integrations, and internal service boun

Lead Frontend Engineer working on React / TypeScript / Redux applications for an internal banking platform used by branch managers for customer payments, transfers, account opening, and customer-service workflows.

- Built React / TypeScript / Redux frontend applications for internal banking operations, including account opening, payments, transfers, and customer-service workflows.
- Developed reu

Frontend / React Developer working on a platform for selling insurance products through partner organizations such as banks, postal services, and other customer-facing channels.

- Built frontend functionality for an insurance sales platform using React, Redux, Redux Thunk, JavaScript, and SCSS.
- Developed reusable UI components and contributed to the application component library, helping standa

Scientific research role combining research work with software development for statistical calculations, data processing, visualization, and workflow automation.

- Built internal utilities for statistical calculations and research data visualization using Excel and VBA.
- Developed Node.js and JavaScript tools for data processing, reporting, and research workflow automation.
- Created reusable sc

Frontend / JavaScript role building web interfaces for Keenetic routers and network-device management in a Linux-based embedded networking environment.

- Developed JavaScript-based web interfaces for router configuration and network-device management.
- Worked with a custom frontend library and internal build system for embedded web applications.
- Built a summary dashboard showing device status,

Strong analytical and interdisciplinary training with emphasis on learning complex domains quickly and
adapting to new technical environments.