Valerii Zinchenkosystems rescue & hardening

I rescue and harden systems
other people are afraid to touch.

Legacy debt, slow databases, servers under attack, migrations that cannot break production.

Montenegro, Podgorica · EU Contractor

from free diagnostics to $3,000+ engagements

Flagship case study

One menu platform instead of five disconnected tools

Figma plugin · Admin panel · Desktop app · NestJS API, wired to 8 POS systems

Menu platform built with a Figma plugin, admin panel and desktop app
2,460hdelivered solo
$20,000project value
8POS integrations
3 apps, 2 libsone system

The mess

Menus lived in Figma. Live prices and availability lived in eight different POS systems (Square, Clover, Oracle, Focus, CBS NorthStar, TableNeeds, Qu, HolidayOil). Someone was copying between them by hand, and nothing had a single source of truth.

What I did

  • Pitched and defended a simpler operator flow, proved with a PoC, instead of the over-engineered first idea.
  • Designed the whole ecosystem: admin panel, Figma plugin editor, Rust/Electron desktop app, NestJS API, plus a shared UI kit and viewer as two private npm libraries.
  • Built a custom Figma viewer that compiles design JSON to native HTML/CSS, with a SmartText system for live price and availability.
  • Added three WebSocket gateways with typed event routing, OpenAPI-derived types, and JWT auth with batched token refresh.

The outcome

Five disconnected surfaces became one flow: add config, create menus, assign, push over WebSocket, render. Delivered end to end over 2,460 hours.

Have a system like this? Start with a free call →

Projects

A selection of work across domains

$76K+ delivered · ~5,300 hours

Algo Academy

Archived
120h × $17/h = $2,000

Algorithm learning platform for coding education

TypeScriptReactReduxSCSSDocker
Algo Academy
View on GitHub →

AtomSMM

Archived
$5,000

SMM panel for social media marketing (2 versions)

TypeScriptReactCRA
AtomSMM
Private client work

Beelink

Lost
86h × $12/h = $1,000

Drone fire-detection system with Android controller (lost project)

JavaAndroid SDKMavLinkGoogle Object Detection
Private client work

BMC

Lost
30h × $27/h = $800

Multi-repository codebase audit revealing 70% code duplication across frontend and backend projects

ReactTypeScriptJavaScriptExpress
Private client work

Campaign Dashboards

Archived
200h × $15/h = $3,000

Analytics dashboard with fully serverless backend

TypeScriptReactAWS SAMLambdaCloudFormationHasuraGraphQLAuth0AmplifyDigitalOcean Spaces
Campaign Dashboards
View on GitHub →

COH

Archived
$2,000

3D real-time strategy game with navmesh pathfinding

TypeScriptThree.jsrecast-navigation@react-three/fiber
View on GitHub →

Creaty

Archived
$1,200

Content creation platform with Django backend and React frontend

PythonDjangoPostgreSQLRedisCeleryReactTypeScriptDocker ComposeGitHub Actions
Creaty
Creaty
Creaty
View on GitHub →

Denshya / tama

Active

Reactive TypeScript ecosystem with lightweight JSX inflator, observable state, SSR, and router

TypeScriptJSXSSRnpm
View on GitHub →

ERPNext Optora

Archived
$800

ERPNext / Frappe customizations for business process automation

PythonFrappeERPNext
View on GitHub →

Etukk

Archived
360h × $6/h = $2,000

Web platform frontend

TypeScriptReact
Etukk
Etukk
Private client work

feature.fm

Archived
240h × $17/h = $4,000

Feature management platform deployed on Cloudflare Workers

TypeScriptCloudflare WorkersWranglerViteVitest
Private client work

Game Editor

Archived
160h × $9/h = $1,500

3D game editor with GPU path tracing capabilities

TypeScriptWebGLGPU Compute
Game Editor
View on GitHub →

HCF Charity Series

Archived
80h × $18/h = $1,400

Series of charity fundraising platforms — Water, House, Childhood

TypeScriptReactDockerGitHub Actions
HCF Charity Series
View on GitHub →

LiquidNFT

Archived
230h × $15/h = $3,500

Multi-chain NFT platform with landing pages and marketplace

TypeScriptReactethers.jsWeb3tronweb
LiquidNFT
View on GitHub →

Menu App

Archived
2460h × $8/h = $20,000

Complete restaurant menu ecosystem with Figma Plugin, Admin Panel, and Desktop Display App integrated with 8 POS systems

TypeScriptReactNestJSFigma Plugin APISocket.IOMongoDBS3WebSocket
Menu App
Private client work

Merlines

Archived
$1,500

Business frontend application with GitLab CI/CD pipeline

TypeScriptReactDockerDocker ComposeGitLab CI
Merlines
Merlines
Private client work

PARAGO_OS

Archived
8h × $63/h = $500

Full-stack code audit with security analysis, code duplication audit, and migration recommendations

TypeScriptReactDrizzle ORMNeonDBSendGridgitleaksHusky
View on GitHub →

Polygon Constructor

Archived
$350

TypeScript 2D polygon layout library with blocks, transforms, and import/export

TypeScriptreflect-metadata
View on GitHub →

Project Atlas

Archived
$500

Local-first project management tool backed by git

TypeScriptReactisomorphic-git
View on GitHub →

Rukaku

Archived
$2,000

Multi-language microservice finance platform

RustTypeScriptPythonnginxDocker ComposeWebSocket
Private client work

Smartlink

Archived
210h × $17/h = $3,500

Link management platform with production NestJS API and React frontend

TypeScriptReactRedux ToolkitNestJSPostgreSQLTypeORMSocket.IOZodPM2DigitalOceanGitHub Actions
Smartlink
View on GitHub →

Solana DEX Trading Bot

Archived
160h × $25/h = $4,000

High-throughput DEX trading strategies with Solana blockchain integration

TypeScriptBunPythonSolana SDKgRPCJitoDocker Compose
View on GitHub →

Standoff Series

Archived
800h × $15/h = $12,000

Collection of 5 browser-based casino games

TypeScriptReactReduxReact RouterVite
Standoff Series
Standoff Series
View on GitHub →

Story Studio

Archived
$800

Custom TypeScript compiler toolchain with plugins for ESLint, TSServer, and Vite

TypeScriptts-patchESLintTSServerVite
View on GitHub →

Tilt-Nova Sales

Archived
210h × $14/h = $3,000

Sales platform with CRM functionality

TypeScriptReactViteTailwindshadcn/ui
Tilt-Nova Sales
Private client work

Catalog (Pricing)

Fixed-price services with clear deliverables and delivery time. No hidden fees.

Proven playbook, these paths were walked many times

Consulting

  • Honest Advicefree

    Your project, looked at honestly: what's broken and what to do first in 15 min

  • Code Audit & Architecture Review~$500

    Security holes, duplication and shaky architecture found, with a written report in 3-5 days

  • Migration & Modernization~$500-2000

    Legacy code is unspaghettified: TypeScript, modern frameworks, CI/CD in 1-3 weeks

Infrastructure

  • Server Rescue & Hardening~$300-900

    Hacked, overloaded or crashing: I stabilise it first, then harden SSH, firewall and auth, and leave you a written post-mortem in 1-3 days

  • Deployment & CI/CD~$250-500

    Docker, nginx, SSL and pipelines that ship on every push in 2-4 days

  • Cloud Development~$400-1000

    Serverless APIs on AWS Lambda, Cloudflare Workers or Supabase in 1-2 weeks

  • PostgreSQL Performance~$200-500

    Send me the slow query. I read the EXPLAIN plan, add the right index, and show before/after timings. 8s to 80ms on a real case in 1-3 days

  • Maintenance~$150-400/mo

    Monthly fixes, updates, monitoring: the project just keeps running in ongoing

Development

  • Backend Developmentfrom ~$800

    APIs in NestJS, Express, Django, FastAPI or Rust in 1-3 weeks

  • Frontend Developmentfrom ~$600

    React + TypeScript apps, component libraries, state that doesn't bite in 1-2 weeks

  • CMS-based Website~$800-2000

    Content-managed site on Next.js + Payload CMS; your team edits it without me in 1-3 weeks

  • E-commerce & Online Shopsfrom ~$800

    Catalogs, payments, orders, even Telegram storefronts in 1-3 weeks

  • Chat Bots~$200-600

    Telegram / Discord bots for commerce, notifications, integrations in 3-7 days

  • Simple 3D Scenesfrom ~$500

    Three.js viewers, configurators and visualizations right in the browser in 1-3 weeks

PaymentsPayPal · Bank transfer (EU / Montenegro / RU) · Crypto
Lifecycle
01Discovery→02Architecture→03Development→04Deployment
Skills
TypeScriptRustPythonGoJavaC#ReactThree.jsCanvas 2DDenshya / TamaNestJSExpressFastAPIDjangoFlaskAxumDockernginxAWSGCPCloudflare WorkersFly.ioDigitalOceanPostgreSQL (50M+ rows)RedisRabbitMQMongoDBGitHub ActionsGitLab CIViteBunPM2
MethodsB2B/Escrow · EU/RU/Asia · CET/CEST · Daily updates · NDA · IP stays yours

Questions

Straight answers before you get in touch

What kind of systems do you rescue?

Overloaded or hacked Linux servers, slow PostgreSQL databases, fragile webhook and API pipelines, and legacy frontends that block delivery. If it is in production and misbehaving, that is my starting point.

How fast can you start?

Same-day reply, and most jobs start within 24 to 48 hours. Outages and data-at-risk incidents are triaged first.

How does pricing work?

Fixed price per service, quoted after a free 15-minute diagnostic. A PostgreSQL performance pass starts around $200, server rescues run $300 to $900, and larger migrations or builds go to $3,000 and beyond. No hourly surprises.

Do you work remotely?

Yes. I am an EU contractor based in Podgorica, Montenegro (CET/CEST), working with clients across the EU and US, async-first with daily updates.

Do you sign NDAs, and who owns the code?

Signed NDAs on request. Your code, data and intellectual property stay yours.

Which stacks do you work in?

TypeScript and React on the frontend, NestJS, Express, Django, FastAPI or Rust with Axum on the backend, PostgreSQL, Redis and RabbitMQ for data, and Docker, nginx, AWS, GCP and Cloudflare for infrastructure.

Start with a free 15-minute diagnostic

Tell me what is broken. I will tell you what to fix first, and whether I am the right person for it.