Live visitor cursors in real time
Multiplayer cursors on a portfolio site. WebSocket via Nitro, SVG avatars through own API, random nicknames and an interactive online bar.
Technical context
Nuxt, WebSocket, Nitro, TypeScript
Kaliningrad, RussiaBuilding software since 2010
Nick Kosarev
Fullstack Developer / Tech Lead
I build web products across interfaces, backend services and infrastructure. Foodtech and fintech experience; hands-on responsibility from data models to release.
Experience
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EXPI · ИП Петров И.И.
Tech Lead / Fullstack Developer / DevOps
Full experience and responsibilitiesSole engineer for a fintech platform: architecture, implementation, infrastructure and releases.
- Migrated PHP data and services in stages using ETL, parallel reads and reconciliation. Decoupled copy-trading workers from PHP; portal migration remained in progress.
- Moved Matrix to a cloud worker with idempotent commands, broker reconciliation, leases and pausing on uncertain state. Prepared a paid subscription and public offer for launch; Matrix remained in production testing.
Case studies
Find a relevant problem, then explore the implementation. Filter by area, technology or project.
Read case
Next.js e-commerce catalog with thousands of products
Online store for printer cartridges and office supplies on Next.js. Catalog with thousands of SKUs, filtering, search, and SSR without lag.
Technical context
Next.js, React, TypeScript, PostgreSQL
E-commerce conversion features
Recommendations, product videos, instant search, guest checkout. Each feature targets higher average order value and checkout conversion.
Technical context
Nuxt, TypeScript, Tailwind CSS
Multilingual architecture for an open-source platform
Designed an i18n architecture for an open-source project supporting 11 languages. A new language can be added in 30 minutes with no coding required.
Technical context
Nuxt, Nuxt UI, Pinia, VueUse
Project closed in 2026
Real-time interactive game
Multiplayer Twitch chat game built on Canvas API and WebSocket. Viewers interact via chat commands, OAuth auth, inventory and trophy system.
Technical context
WebSocket, Canvas API, TypeScript, Twitch API
Telegram Mini App for team management
Built a Telegram Mini App for restaurant team task tracking: assignments, statuses, deadlines, KPI monitoring. The entire team adopted it within a week.
Technical context
Telegram Mini App, TypeScript, Vue
Async task processing
Integrated PostgreSQL and RabbitMQ for task queues. Improved reliability and speed of the internal delivery service.
Technical context
PostgreSQL, RabbitMQ, TypeScript, Node.js
Project closed in 2026
Zero-commission online payments for restaurants
Direct acquiring integration for a food delivery SaaS platform. 0% order commission instead of 3-5% charged by aggregators.
Technical context
Nuxt, TypeScript, Node.js
Project closed in 2026
SEO architecture for delivery sites
Individual product pages with Schema.org markup, SSR, meta tags. Client sites rank on Google's first page for local queries.
Technical context
Nuxt, TypeScript, Tailwind CSS
Project closed in 2026
MusicBrainz catalog integration
Integrated MusicBrainz catalog (127,000+ artists), ListenBrainz scrobbling, and a Telegram Mini App for mobile library access.
Technical context
Nuxt, TypeScript, Telegram Mini App
Project closed in 2026
Audio transcoding pipeline
Server-side pipeline: FLAC/MP3/OGG upload, transcoding to multiple formats, S3 streaming. Lossless playback in the browser from any device.
Technical context
Nuxt, TypeScript, S3, Node.js
Scalable infrastructure on Kubernetes
Deployed the platform to Kubernetes: autoscaling under load, CI/CD pipelines, zero-downtime deploys. Reduced hosting costs while handling growing traffic.
Technical context
Kubernetes, Docker, CI/CD, Nginx
Platform migration to React & NestJS
Rewrote the o5.Food core from PHP/jQuery to TypeScript/React/NestJS. Modular architecture, typed API, 500+ business clients migrated with zero downtime.
Technical context
React, TypeScript, NestJS, Node.js
Projects
Past independent products and public source. Closed projects are labelled; the engineering work remains available.
NextOrders
An open-source food-ordering platform with SSR, multiple languages, a persistent cart and guest checkout.
Meloteka
Project closed in 2026
Built a music catalog with a web app, Telegram Mini App, Subsonic API compatibility and audio transcoding.
Startodel
Project closed in 2026
Built a food-delivery website platform with menus, online orders, payments, notifications and multiple languages.
ChatGame
Project closed in 2026
Built an interactive Twitch game with chat commands, real-time synchronization and a Telegram Mini App.
A page you can explore together
On desktop, live cursors show where other readers point. Open a second window or send the page to a colleague. The pill at the bottom opens your profile, where you can hide or show cursors.
How live cursors work