Данил Лисин | Versatile Vue.js Developer (Vue 3, TypeScript)

Danil Lisin

VUE JSDeveloper

Transforming complex tasks into elegant solutions. Specializing in Vue 3, TypeScript and creating scalable applications with well-thought-out architecture.

Architecture as a reactive system

Interface as its human face

Pushing beyond 'just code', I design cohesive SPA systems where Vue's modularity and TypeScript's clarity serve one goal — creating intuitive and high-performance digital products

Application structure designDeveloping modular and scalable architecture, organizing codebase for easy maintenance and growth

Interface layoutCreating responsive, cross-browser and accessible interfaces using modern approaches (Flexbox, Grid)

State management implementationSetting up centralized store (Pinia/Vuex), organizing data and their reactive connections between components

Client-server communicationBuilding service layer for API work, error handling, implementing retry mechanisms and caching

RoutingDeveloping complex navigation systems with nested and protected routes, lazy loading of components

This approach enables me to create reliable and scalable solutions that are convenient to develop and maintain.

Vue 3 with Proxy for 'smart' reactivity, and Vite launches the project instantly using built-in ES-modules.Pinia is built for TypeScript from the ground up — types are inferred automatically. This entire stack works on the principle of a constructor: you assemble logic from ready-made functions, rather than writing tons of configuration.

Technology Stack

Core Technologies

Vue.JS

SPA development using Composition API, composables, reactivity, working with lifecycle hooks, custom directives

Nuxt

SSR and SSG applications based on file-based routing, data fetching on server and client, SEO optimization and API integration

Pinia

Application state management using Composition API, organization of modular stores via Setup Store syntax, TypeScript integration

TypeScript

Strict typing, generics, utility types, type safety in components and stores

Vite

Fast project building, plugin configuration, production build optimization

Infrastructure & Tools

Vue Router

Navigation with lazy loading, nested routes, navigation hooks, history management

Vue i18n

Application localization, dynamic translation loading, pluralization

Git

Team collaboration, feature branches, code review, conflict resolution

REST API

Development and use of custom HTTP request wrappers, error handling, caching, request lifecycle management

Layout & Styling

HTML5/CSS3

Semantic markup, responsive design, CSS Grid/Flexbox

SCSS/SASS

Preprocessing, mixins, modular styling, CSS Custom Properties

Bitrix Experience

Worked on support and development of new TravelShop 1.0 templates for various airlines. Confidently use PHP for this purpose. Understand Bitrix specifics.

Development and support of TravelShop 1.0 templates

Integration with flight booking systems

Customization of functionality according to airline requirements

Working with PHP in the context of Bitrix projects

Understanding Bitrix architecture and features

I integrate AI assistants into my workflow to automate routine tasks and enhance analytical capabilities. This not only speeds up code writing and bug detection, but also helps in feature design, documentation, and finding non-obvious solutions, ultimately improving the quality and speed of delivery.

Claude

Cursor

GitHub Copilot

Career

2017 - 2025

Design and development of Vue 3 components for TWx and TravelShop products. Creating UI architecture, developing interactive elements and complex SPA applications for flight booking systems. Support and customization of TravelShop templates on Bitrix for various airlines.

Development of front-end interfaces for online booking and flight registration systems. Creating intuitive user interfaces, working with forms and data validation, integration with backend systems and APIs.

1998 - 2017

Creating animated and interactive advertising banners for television projects. Full development cycle: from concept and design to implementation using HTML5, CSS3 and JavaScript. Creating responsive banners supporting various sizes and devices.

Design and development of websites for major advertising agency clients. Creating interactive interfaces, working on improving user experience. Participation in creating comprehensive digital solutions for brands. Working according to corporate standards and client guidelines.

Development and support of websites for company's media projects. Creating user interfaces, designing promotional pages and landing pages. Integration of design with content management systems, optimization of web page performance.

Development of corporate website designs, creating advertising banners and iconography. Full interface design cycle: from prototyping and visual design to adaptive layout. Graphics optimization and ensuring cross-browser compatibility.

Full cycle of web project creation: from user interface design and visual design to frontend development. Creating intuitive interfaces for content exchange platforms, developing admin panels and user cabinets. Optimizing user experience and interaction.

Development of corporate website designs and promotional pages for company's gaming projects. Creating visual concepts, designing page layouts and interface elements. Preparing graphic materials for web publications.

Design of user interfaces for financial and trading platforms. Creating intuitive and functional interfaces for working with financial data. Development of visual communication systems and branding elements.

Creating website designs for agency clients. Development of visual concepts, preparation of layouts and graphic elements. Working on improving user experience and navigation on web resources.

Design and development of web interfaces for internet portals. Creating user interfaces, working on improving navigation and content structure. Development of graphic elements and visual identity systems.

Design and development of websites for various business segments. Full interface creation cycle: from target audience research and prototyping to final implementation. Development of adaptive designs and ensuring cross-browser compatibility.

Creation of corporate website and online store designs. Development of user interfaces, navigation design and content structure. Working on branding and creating unified visual systems for web projects.

Execution of website design and development orders for various clients. Creating unique design concepts, developing page layouts, preparing graphic elements. Working on full web project creation cycle from idea to implementation.

Website design for production company clients. Creating visual concepts, developing interfaces and navigation systems. Preparing graphics for web publications and ensuring design compliance with technical requirements.

Design of early websites at the beginning of internet development in Russia. Establishing foundational principles of web design and navigation. Working with limited technical capabilities of that time, optimizing graphics for slow internet connections.

Lead Frontend Developer

TravelShop 2.0 - Flight Booking System

Development and maintenance of a modern flight ticket booking system for Russian and foreign airlines, including Azimut.

Key System Features

Real-time flight search and bookingProvides direct access to current airline data and fares for instant booking.

Complex business logic for fare and fee calculationAutomatically applies flexible pricing rules, including individual conditions for corporate clients.

Multi-step booking process with data validationIntuitive step-by-step process with information verification at each stage to minimize errors.

Order and passenger management systemProvides passengers with a personal account for self-service booking management and online check-in.

Integration with booking systems (GDS)Connects to GDS, DCS, and metasearch services through flexible API for content access.

Support for additional services (baggage, meals, insurance)Efficiently offers ancillary services during booking to increase average order value.

Responsive design for all devicesBuilt on PWA (Vue.js) technology, ensuring equally convenient operation on any device.

Achievements and Results

Scalable architecture developed, accelerating new feature deployment by 40%

Booking errors reduced by 60% through implementation of passenger data validation system

Performance improved by 25% through implementation of search query caching mechanism

Code reliability enhanced through configuration of code review process and implementation of static typing

Proper display on all devices ensured through adaptive layout

Implemented Projects

Azimuth Airlines

Full-featured booking system with customized design

TravelShop White Label

Base platform for rapid deployment of booking systems

Architectural Solutions in Vue

Professional Ethics and My Skills

While commercial project source code cannot be published due to IP rights, I can discuss implementation details, architectural decisions, and development methodologies.

I am ready to complete a test task to demonstrate in practice my approach to problem solving, code quality and professional skills.

UI Components Development

UI Components Architect

Designed and implemented a UI component library for a large web application with focus on accessibility, performance and developer experience.

Key Components

Input fields and selectors

Components implement full interaction cycle including validation, input masks, custom placeholders, as well as visual states for errors and loading.

Smart autocomplete

Component features complex keyboard handling logic, virtual scrolling, optimized for mobile devices and supports convenient T9 input.

Modal windows and tooltips

Universal overlay components with swipe gesture support, automatic background scroll blocking, and proper focus management for accessibility.

Calendar and date picker

Flexible component for selecting single dates and periods with ability to define custom range highlighting logic and configurable visual states.

Tables and tabs

Library includes high-performance tables with row virtualization and adaptive tab components equipped with programmatic API for navigation control.

Development Process

API Design

Developing component interfaces considering usability and type safety

Core Functionality Implementation

Creating main component functionality with accessibility support

Testing and Documentation

Writing tests and creating documentation with usage examples

Integration and Feedback

Project integration and feedback collection for component improvement

Architectural Components

Base Componentsfundamental UI elements with well-designed API and theming support

Composite Componentscomplex compound components built on base elements

Theming Systemappearance customization mechanism through CSS Custom Properties

Documentationcomprehensive documentation with usage examples and API reference

Approach Benefits

30% faster feature development through component reuse

Ensuring interface consistency throughout the application

Simplifying codebase maintenance and scaling

Improving user experience on mobile devices

40% reduction in UI logic bugs

REST API Pipeline System

Efficient Management of Interconnected API Call Chains

A powerful system for organizing sequential HTTP requests to REST API, where each subsequent call can utilize data from the previous one. Provides complete control over request chain execution with progress visualization and intelligent error handling.

Key System Capabilities

Sequential HTTP chains

System organizes and executes REST API requests strictly one after another, ensuring correct execution order and control over data flow.

Auto data transfer between steps

Results of each executed request (e.g., created object ID) are automatically and safely substituted into parameters of subsequent requests, eliminating manual data stitching.

Real-time progress tracking

Interface displays visual progress bar and status of each stage, providing user with full transparency about current execution state.

Smart error handling and retries

System analyzes server response codes (e.g., 5xx errors) and automatically performs request retries according to configurable rules, increasing fault tolerance.

Conditional execution logic

Allows defining rules (e.g., if/else) that determine whether the next request will be executed, based on data obtained in previous steps.

Auto-cancel dependent requests

When a fatal error occurs, the system automatically aborts execution of the entire subsequent chain, preventing pointless calls.

End-to-end type safety

Thanks to TypeScript integration, system ensures strict type checking for input parameters and data passed between pipeline steps.

Pipeline Work Process

Request Chain Configuration

Defining the sequence of API calls, dependencies between them, and execution conditions for each stage

Initialization and Validation

Configuration correctness check, data preparation, and execution progress tracking initialization

Sequential Execution

Step-by-step execution of HTTP requests with automatic data transfer and intermediate result processing

Monitoring and Management

Continuous progress tracking, handling emerging errors, and adaptive management of chain execution

Final Processing and Cleanup

Aggregation of all request results, data finalization, and system resource release

Architectural Components

Pipeline Orchestratorcentral coordinator managing the sequence of API request execution and data transfer between them

Request ExecutorHTTP request executor with support for retry logic, timeouts, and handling of various status codes

Progress Trackermodule for tracking request chain execution progress with detailed breakdown by each stage

Error Handlercentralized error handler with classification by types and recovery strategies

Type Safety Layerstrict typing layer ensuring data correctness at all pipeline stages

Approach Benefits

40% reduction in development time for complex API interactions

Increased reliability through centralized error handling and retry mechanisms

Improved user experience through accurate progress display

Simplified debugging and monitoring of request chains

Flexibility for implementing complex business processes with dependent API calls

Full type safety reduces runtime errors

Easy integration with existing Vue.js application ecosystem

Flexible Localization System with String Overrides

Translation Customization Mechanism for Different Bundles

The implemented system allows overriding specific strings in locales depending on the project build bundle, providing flexibility in interface customization for different clients.

Key Features

Override specific strings

System allows selectively replacing individual translations without requiring full copying and duplication of entire dictionary for making changes.

Support for multiple languages

For each supported language, you can define its own set of custom strings, providing unique interface localization for different regions.

Automatic locale merging

Default translations and custom overrides are automatically merged into a single dictionary during project build.

Bundle-specific configuration

Mechanism takes into account target build bundle (e.g., client A or client B), loading corresponding set of customized translations.

Preserve default values

For all strings that were not explicitly overridden, system guarantees use of standard values from base dictionary.

Quick translation addition

New custom strings can be quickly added as separate files or entries, after which they are automatically picked up by the system.

Work Process

Bundle Identification

The system identifies the current build bundle and checks for custom dictionaries for it

Locale Loading

Base translation dictionaries and custom dictionaries for the specified bundle are loaded

Dictionary Merging

Default locales are merged with custom ones, with custom strings having priority

Result Generation

Final translation dictionaries used in the application are formed

Architectural Components

Base Localesmain translation dictionaries with standard strings for all languages

Custom Localescustom dictionaries with overridden strings for specific bundles

Merge Enginemechanism for merging default and custom locales during build

Bundle Configbundle configuration specifying custom dictionaries for overrides

Approach Benefits

Flexibility in interface customization for different clients

Time savings in maintaining multiple translation versions

Reduced probability of errors when updating locales

Simplified process of adding new custom translations

Maintaining a single codebase for all bundles

Quick deployment of customized versions

Universal Aircraft Seat Map Display System

Architecture with Drivers for Different Data Formats

The implemented system allows displaying aircraft seat maps from various booking systems through a single universal component using special drivers for data transformation.

Key Features

Support for multiple formats

System is capable of working with seat map source data from various booking systems, each having its own unique format.

Universal display component

User interface consists of a single Vue component that visualizes seat map regardless of source or input data format.

Driver system for data

Special adapters (drivers) are used to transform specific data from each provider into unified internal format.

Flexible client configuration

Adding support for new client or booking system requires only creating corresponding driver, without changing system core.

Isolated business logic

All complex validation, display, and seat map interaction logic is encapsulated in universal component and does not depend on drivers.

Quick source connection

To integrate new data source, it's sufficient to implement driver according to ready interface, after which it immediately becomes available for use.

Work Process

Data Receiving

The system receives seat map data from an external system in a specific format

Driver Selection

Based on data type or client, the appropriate transformation driver is selected

Data Transformation

The driver transforms incoming data into a unified format for the component

Map Rendering

The universal component displays the seat map based on prepared data

Architectural Components

Universal Seat Map Componentmain seat map display component with unified API

Data Driversspecialized drivers for transforming data from different formats

Seat Map Engineengine for processing and preparing data for display

Configuration Managerconfiguration manager for connecting drivers to the component

Approach Benefits

Quick connection of new clients with their own data formats

No code duplication in the display component

Simplified system maintenance and updates

Isolation of business logic from data specifics

Architecture scalability

Reduced development time for new integrations

Unified Synchronization System for Distributed Vue.js Applications

State synchronization architecture between independent applications with optional encryption

System for creating and managing multiple independent Vue applications within a single repository with automatic state synchronization between them. Implements cross-tab synchronization mechanism and communication between applications through a unified storage with encryption support and flexible configuration.

Key System Capabilities

Unified architecture for Vue apps

System allows developing and managing multiple independent Vue.js applications within a single monorepo with shared dependencies.

Automatic cross-tab synchronization

Application states are automatically synchronized between browser tabs through single source of truth in localStorage.

Multi-layered store system

Architecture uses combination of Pinia for local state and custom stores for synchronized data with clear separation of responsibilities.

Optional data encryption

Critical storage data can be protected using AES-GCM algorithm to ensure confidentiality.

Prevent cyclic updates

Built-in mechanism tracks and blocks cyclic state updates, preventing data races and infinite loops.

Flexible sync management

Synchronization can be dynamically enabled or disabled for individual applications or state modules without reloading.

Detailed logging and debugging

All synchronization stages (changes, sending, conflicts) are logged for convenient debugging and monitoring of system operation.

System Workflow

Application Initialization

Loading and initialization of multiple independent Vue applications with connection to unified synchronized storage

Synchronization Configuration

Configuration of synchronization parameters, encryption, and connection of event listeners for cross-tab updates

Distributed State Management

Automatic synchronization of changes between applications with processing and resolution of update conflicts

Secure Data Storage

Optional storage data encryption and protection against unauthorized access to system state

Monitoring and Debugging

Detailed logging of all synchronization operations with visualization of connection status and updates

Architectural Components

Multi-App Coordinatorcentral coordinator managing multiple independent Vue applications within a single repository

Cross-Tab Sync Enginesynchronization engine for states between browser tabs via localStorage and custom events

Layered Store Architecturemulti-layered store architecture with clear separation of responsibilities between components

Optional Encryption Layeroptional data encryption layer with AES-GCM support and flexible key configuration

Cycle Prevention Mechanismmechanism for preventing cyclic updates and data races during synchronization

Unified Logging Systemunified logging system with detailed recording of all synchronization operations and error handling

Benefits of the Approach

Single codebase for multiple applications — reducing code duplication by 60%

Automatic synchronization — ensuring data consistency between applications

Architectural flexibility — ability to easily add new applications to the system

Enhanced security — optional encryption of critical user data

Improved UX — instant interface updates when state changes in any application

Scalability — support for unlimited number of applications in synchronized system

Simplified debugging — centralized logging of all synchronization operations in real time

Tools born from real challenges and experience

css-magic-gradient

A library for generating CSS gradients (linear, radial, conic) with color harmonies, WCAG accessibility utilities, CSS variable support, canvas export, and reactive hooks for Vue and React. Includes ready‑to‑use presets and tools for creating accessible gradients.

os-detect

A lightweight utility for detecting operating system and device type (iOS, macOS, Android, Windows, Linux, ChromeOS, mobile or desktop). Works in browsers, Node.js, and SSR. Includes Windows 11 detection, reactive hooks for React, and composables for Vue. Zero dependencies.

color-value-tools

Comprehensive library for working with colors across all models — hex, RGB, HSL, HSV, HWB, Lab, LCH, OKLAB, OKLCH, CMYK — plus CSS variables and named colors. Includes WCAG accessibility, color harmonies, perceptual blending (CIEDE2000), color blindness simulation, palette generation, and a CLI.

rest-pipeline-js

A modular orchestrator for REST requests and pipelines. Includes an HTTP client with retry, caching, rate limiting, and request cancellation, plus a flexible PipelineOrchestrator for sequential or parallel stage execution with pause/resume, middleware, state export/import, and Vue/React integration.

responsive-media

A utility for creating reactive state from CSS media queries and element dimensions. Supports viewport breakpoints (window.matchMedia) and container queries (ResizeObserver). Includes Vue 3 and React 18+ adapters, works in SSR, and has zero dependencies.

vue-i18n-kit

Ready‑to‑use localization layer for Vue 3 built on vue-i18n. Lazy locale loading, ICU pluralization via Intl.PluralRules, locale metadata, date/currency formatting. Vite plugin for translation completeness checks, CLI for locale file management, browser‑based locale editor. SSR and Nuxt ready.

vue-network-dashboard

Universal network monitoring plugin for Vue 3. Intercepts HTTP (Fetch/XHR), WebSocket, and SSE, logs them in a unified format with automatic data sanitization. Includes reactive statistics, request mocking, HAR export, waterfall timeline, Diff View, and a ready-to-use UI component with filtering. Supports Nuxt 3, Sentry, and OpenTelemetry.

vue-feature-toggles

Feature flag system for Vue 3 without project rebuilds. Supports strategies via API, environment variables, localStorage, and A/B testing. Includes reactive directives for conditional rendering, composables, caching, SSR, and Nuxt 3 integration. Full type safety and zero overhead for disabled features.

Seeing the difference — that's what matters

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In my blog I share my experience as a frontend developer: I break down tasks, share solutions, and publish notes about working with the modern web.

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