Responsibilities and Projects: Energy Platform (Core System) - Backend development using PHP (Laravel) — основной фреймворк проекта - Implementation of business logic for energy services and user interactions - Frontend development (website and internal tools) - Development and support of the company website (ayydemperakende) Electricity Cost Calculation API - Design and development of API for electricity price calculation - Implementation of tariff-based pricing logic - High-load расчетные операции с учетом различных параметров Tariff Integration Service (SOAP) - Development of service for retrieving electricity tariffs via SOAP APIs - Integration with external energy providers - Data normalization and caching strategies Electricity Consumption Service - Development of monthly consumption calculation service - Aggregation and processing of large datasets - Optimization of расчетов и хранения данных Admin Panel - Development of admin panel for managing tariffs, users, and consumption data - Internal tools for analytics and operations Tech Stack: Backend: - PHP (Laravel) — основной стек, глубокая экспертиза - Go (Golang) — сервисы и вычислительные задачи Databases: - PostgreSQL - MySQL - Schema design and query optimization DevOps and Infrastructure: - Kubernetes (deployment and service orchestration) - Docker, Docker Compose - Linux (Ubuntu, CentOS) - Database deployment and configuration (PostgreSQL, MySQL) Additional: - Git - Jira - Full development lifecycle: architecture → development → deployment → support - Experience with external integrations (SOAP APIs, energy providers)

Responsibilities and Projects: Microloan Platform (Core System) - Backend development using PHP (Yii2) and Go - Implementation of loan processing logic, scoring, and user flows - Development of admin panel for managing loans, users, and operations - Frontend development (internal tools, admin UI) Debt Calculation Service - Development of service for debt calculation (interest, penalties, schedules) - Implementation of flexible calculation logic for different loan conditions - Optimization for performance and accuracy Payment Systems & Subscription Management - Integration with multiple payment gateways (REST APIs) - Unified payment abstraction layer for working with different providers - Implementation of card binding (tokenization) and secure storage flows - Development of subscription-based payment logic (recurring billing) - Management of user payment methods (add/remove/update cards) - Handling billing cycles, retries, and payment status tracking - Processing asynchronous callbacks / webhooks from payment providers - Error handling, retry strategies, and failover between providers Tech Stack: Backend: - PHP (Yii2) - Go (Golang) Frontend: - SASS - Bootstrap 4, Foundation 6 - Gulp, Webpack Databases: - PostgreSQL - MySQL DevOps and Infrastructure: - Nginx, Apache (configuration, deployment, tuning) - PHP modules installation and configuration - Linux (Ubuntu, CentOS) - Database deployment and configuration (PostgreSQL, MySQL) - Bash scripting - Cron jobs (scheduled tasks, billing, calculations) Additional: - Git - Full development lifecycle: development → deployment → support → scaling - Strong fintech experience: payment integrations, recurring billing, multi-provider architecture, fault-tolerant payment processing

Responsibilities and Projects: National Electronic Platform (NEP) — State Trading Platform: - Development of a government-level trading platform (analog of B2B marketplace) - Core backend development using PHP (Zend Framework, Symfony 4) - Implementation of business logic for product listing, trading flows, and transactions - API development for internal and external integrations - Frontend development (admin panel, internal tools) - Support and further development of the NEP public website Reporting System (Enterprise / Government): - Backend development (PHP, Go) - Development of APIs for data aggregation and reporting - Admin panel development for managing reports and data flows - Optimization of database queries and report generation Electronic Signature Authentication Service: - Development of authentication service using electronic signatures (ES/EDS) - Integration with external certification authorities - Secure request validation and user identification flows Tech Stack: Backend: - PHP (Zend Framework, Symfony 4) — core platform development - Go (Golang) — services and APIs Databases: - PostgreSQL - MySQL - Schema design and query optimization DevOps and Infrastructure: - Docker, Docker Compose (deployment and local environments) - Linux (Ubuntu, CentOS) - Database installation and configuration (PostgreSQL, MySQL) - CI/CD (basic pipelines, manual setups) Additional: - Git - Jira - Experience with high-load state systems - Full development lifecycle: architecture → development → deployment → support

Responsibilities and Projects: Reporting Systems (Enterprise) - Backend development using PHP (Symfony 4, Zend Framework 2) - Frontend development with React.js and Vue.js - Database design and optimization (PostgreSQL, MySQL) - Performance optimization for report generation Alfresco ECM Integration - Integration with Alfresco via WebScripts API - Development of a mobile application for document workflow automation - Implementation of REST API interactions and authentication Transport Aggregator (Bus Tickets API) - Design and development of REST API (PHP, Node.js) - Handling high-load booking and search operations - Development of admin panel (Vue.js) - Integration with external services Hotspot (WiFi Access Platform) - Development of Hotspot API (Node.js, PHP) - Admin panel for user and тариф management - Work with network-level authentication and access logic Crypto Casino Platform (TRON / TRX) - Development of smart contracts (Solidity) - Backend API and blockchain integration - Implementation of payment and wallet interaction logic E-commerce and CMS Platforms - Development and customization (WordPress, Drupal 7, Bitrix, Yii2) - Payment system integrations - Performance improvements Tech Stack: Backend: - PHP (Symfony, Zend Framework, Yii2) - Node.js - Go (basic) Frontend: - React.js - Vue.js - TypeScript (basic) - SASS, Bootstrap 4, Foundation 6 - Gulp, Webpack Blockchain: - Solidity (TRON) DevOps and Infrastructure: - Nginx, Apache (setup, configuration, optimization) - Linux (Ubuntu, CentOS) - Docker, Docker Compose - DigitalOcean (cloud infrastructure) - PostgreSQL, MySQL (deployment, tuning, schema design) - DNS configuration - SSL (HTTPS, Let's Encrypt) - Bash scripting, cron jobs Additional: - Git - Redmine, Jira - Full development lifecycle: development → deployment → support → scaling