Backend/full-stack engineer

High-load pet-supplies online store — 6+ years as lead developer

Problem

A federal pet-retail chain needs a reliable high-load online store: dozens of external integrations, marketplaces, delivery and payments — with no downtime under peak load.

What I built

I lead development of a 1C-Bitrix platform (PHP 7.4, legacy monolith) on nginx + php-fpm, with a Vue frontend. 30+ integrations — delivery services, payment systems, marketplaces; an internal API of ~200 endpoints, RabbitMQ queues, Redis cache. Observability with Prometheus + Grafana + Loki and Graylog. I focus on performance too: DB indexes and rewritten queries, and removing quadratic (O(n²)) scans. I extract logic from the monolith into Go microservices with a clean (ports-and-adapters) architecture. CI/CD runs on GitLab CI.

Result

6+ years as lead developer with a cross-functional team. Production holds 600+ RPS at peak. I sped up heavy endpoints by tens of times: 10s → 0.2s, 40s → 1.2s, and 2s → 0.2s on average. Releases ship through GitLab CI.

• PHP 7.4
• 1C-Bitrix
• nginx
• php-fpm
• Vue
• Go
• RabbitMQ
• Redis
• Prometheus
• Grafana
• Loki
• GitLab CI

Veterinary-services website on Symfony DDD+CQRS and FrankenPHP

Problem

A veterinary clinic needed to move away from a compromised WordPress site to a safer, editable and extensible platform: preserve legacy SEO value, give editors control over content, and prepare the foundation for bookings, pet profiles and future integrations.

What I built

I designed a modular monolith on Symfony 7.4 LTS and PHP 8.5: Site, Lead, Clinic, Catalog, Page, Seo and Admin contexts, DDD layers and CQRS through three Symfony Messenger buses. I built Twig SSR for indexable service, program, clinic, specialist and static pages; added EasyAdmin for editors, a lead form with email notifications, and idempotent content seeds imported from the old WordPress dump. Production runs on FrankenPHP/Caddy worker mode, PostgreSQL 16, Doctrine ORM 3, Docker Compose and a deploy script.

Result

The result is a modern services website with public SSR pages, an admin panel and a strong SEO/GEO foundation: canonical/meta/OG, JSON-LD for the organization, clinics, doctors, services and breadcrumbs, sitemap.xml, robots.txt, cookie consent for Yandex Metrica and 301 redirects from legacy WordPress URLs.

• PHP 8.5
• Symfony 7.4 LTS
• DDD
• CQRS
• Symfony Messenger
• FrankenPHP
• PostgreSQL 16
• Doctrine ORM 3
• EasyAdmin 5
• Twig SSR
• Tailwind CSS
• Docker

Employee portal for the pet-retail chain: bonuses, vacations, gigs, HR

Problem

Staff of the same Bethowen chain (see bethowen.ru above) need one portal: sales bonuses, vacations with approval, news, polls, gigs, store chat, HR.

What I built

A monorepo: a NestJS backend (Prisma, PostgreSQL, Redis, JWT with refresh-token rotation) and a Next.js frontend (React 19, TailwindCSS, TanStack Query). Role model — seller, store manager, network manager, HR, admin — with per-store data isolation. Bonuses are computed from the corporate sales API; notifications arrive in real time (SSE). One bearer API serves web and a mobile client; GitLab CI auto-deploys to production.

Result

MVP plus 25+ feature stages in production (lk.petretail.ru): bonuses, vacations, news, polls, notes, gigs, flea market, store chat, feedback and an HR section.

• NestJS
• Next.js
• React 19
• Prisma
• PostgreSQL
• Redis

Android client for the corporate portal, built on Kotlin Multiplatform

Problem

Sales staff and store managers can't comfortably open the web portal mid-shift — the phone is always at hand, a laptop is not. They need a native client for the same cabinet — the Bethowen corporate portal (lk.petretail.ru): bonuses, vacations, store chat, order pickup — with the role model and permissions intact.

What I built

Kotlin Multiplatform: the shared module holds Ktor Client, kotlinx.serialization, SQLDelight, repositories, auth with silent session refresh and forced logout, and a TipTap→HTML converter — logic ready to be reused on iOS. The UI is Jetpack Compose + Material 3: type-safe navigation, ViewModel/Flow, Koin, Coil 3, light and dark themes, minSdk 26. It speaks the same bearer API as the web, gets realtime over SSE, push over FCM, and keeps an owner-scoped offline cache of news and notifications. A Data Matrix (KIZ) scanner runs on an on-device ML Kit model with no network download, plus deep links and verified sideload APK updates (SHA-256, package, versionCode).

Result

All 16 vertical stages of the port are closed with runtime QA: news with reactions and comments, personal bonuses and store analytics, vacations, polls, notes, chat, gigs, flea market, feedback, an HR section and order pickup with the KIZ scanner, plus push, offline cache and verified APK updates — at parity across all 55 web routes and five roles. Development is AI-driven (Codex + Claude): architecture, stage breakdown and review are mine. Distribution is a sideload APK published from the portal admin; iOS is the next stage on the same shared module.

• Kotlin Multiplatform
• Jetpack Compose
• Material 3
• Ktor Client
• SQLDelight
• Koin
• ML Kit
• Firebase Cloud Messaging

Internal SaaS monitoring 100+ services with alerting

Problem

A retail chain needs to watch hundreds of services — HTTP, TCP, databases, domains, SSL — and be the first to know about outages.

What I built

A Go service: checks of several kinds, metrics stored in PostgreSQL + ClickHouse, alerting to Telegram and Yandex Messenger. Shipped with ADRs, OpenAPI 3.1 and architecture diagrams.

Result

Covers 100+ services. Delivered to production with full docs and a deployment guide.

• Go
• PostgreSQL
• ClickHouse
• Docker

Designer-furniture online store — 4+ years of improvements and support

Problem

A designer-furniture shop needs to evolve and maintain its existing site on a legacy stack, without a rewrite.

What I built

I improve a 1C-Bitrix site (PHP 7.4, BitrixVM): new sections and features, catalog and checkout changes. The frontend is plain JavaScript and jQuery.

Result

4+ years evolving and supporting the project in production.

• PHP 7.4
• 1C-Bitrix
• JavaScript
• jQuery

Training and assessment for furniture-store staff: quizzes, materials, admin panel

Problem

A designer-furniture store needs to train and assess its staff: learning materials, quizzes with attempts and statistics, and cabinet access granted only after admin approval.

What I built

Laravel 13 (PHP 8.5, FrankenPHP) + PostgreSQL 17. The cabinet is Inertia.js + Vue 3 + Tailwind; the admin panel is Filament 4. Quiz module: single/multiple-choice questions, timer, attempt limits, shuffling, wizard flow with autosave. Learning materials with rich content and video attach to quizzes as prerequisites. Email sign-up with admin approval and roles (spatie/laravel-permission). QA: Pest, Larastan, Pint; the whole environment runs in Docker Compose.

Result

From spec to production in 3 days and 73 commits: AI-driven development where the architecture, task breakdown and review of every commit stay with me. Live: quizzes with results and CSV export, materials, and an admin dashboard with statistics.

• Laravel
• PHP 8.5
• PostgreSQL
• Filament 4
• Inertia.js
• Vue 3

Offline privacy auditor for installed apps

Problem

Apps quietly observe what else is installed on the phone and how the device is used.

What I built

A fully offline Android app: parses manifests, scores risk from permission/receiver combinations, and explains every finding in plain language. Zero network calls, zero analytics.

Result

Open source under MIT. Local-only analysis — no servers, no signature feeds.

• Android
• Kotlin
• Gradle

A Telegram bot for currency conversion using CBR rates

Problem

Quickly convert an amount to another currency right inside a chat — no calculators or websites.

What I built

A Go bot: free-form amount input, inline mode, rate subscriptions, whitelist and admin commands, rate caching. Rates come from the official CBR XML feed.

Result

Does the math right inside the chat — no more calculators or rate websites. Deploys with a single docker-compose.

• Go
• Telegram Bot API
• Docker