Independent product & engineering studio

High-performance
Backend systems & scalable product ecosystems

We build resilient B2B microservices, PMS systems, E2E messengers, and fintech platforms with C# / .NET 10 and Docker.

Discuss a project Explore products

Modular by design Built for production

Systems that scale with you

qzde.core / architecture LIVE

Web API

QZDE Core.NET 10

Data layer

Realtime

Modules

Security

Always asyncRealtime by default

ENGINEERED FOR WHAT'S NEXT

Scroll to explore

THE PRODUCT LAB

Not just projects.
Working ecosystems.

We build products and platforms that solve real problems—from hospitality to secure communications.

ADVANCED MODULES

Operational depth, at a glance.

Two standalone products with rich interfaces: crypto-market arbitrage analytics and hospitality management with referral distribution.

CRYPTO ARBITRAGE · CROSS-EXCHANGE

01 / 02

BROTHERMES ARBITRAGE SUITE

Cross-currency monitoring and arbitrage discovery across exchanges, with streaming spreads, net margins, and automated-agent oversight.

Live Spread Heatmap · Exchanges · Matrix · HWID

SignalR Live Spread Heatmap with selectable time ranges
Binance, Blackbit, Winance, and Money Storage rates with availability status
Arbitrage matrix with buy/sell prices and net margin (%)
Playwright agents, ingest status, and HWID profile control

Open productbrmes.qzde.de

HOSPITALITY · MLM & BONUS ARCHITECTURE

02 / 02

YSHKYN PMS

A hotel and glamping PMS integrated with network distribution: properties, room inventory, wallet, and automated service-margin sharing.

Room inventory · properties · balance

Room states: available, occupied, housekeeping, and service
Unified tracking for properties, team members, and wallet balance
Referral MLM structure with level 1 and 2, uplink, and downline
Automatic referral-link bonus allocation from net service margin

Open productyshkyn.qzde.de

Mars Notebook project tree alongside a Markdown editor

04Coming soon

Knowledge base · Markdown workspace

Mars Notebook

mars.qzde.de

A hierarchical knowledge base with a project tree, Git scripts, and a Markdown editor.

SHA-256 · 8f14e45f…

ZERO-KNOWLEDGE
VERIFIED

DOCUMENT TRUST LAYER

05Coming soon

B2B document trust · zero-knowledge

QZDE CryptoSign

sign.qzde.de

B2B digital signing, SHA-256 hashing, and zero-knowledge document validation.

QZDE Billing customer and financial transaction table

06Coming soon

B2B finance · invoicing platform

QZDE Billing

billing.qzde.de

An ibilling-based platform for customer tables, financial transactions, invoices, statements, and proposals.

One modular foundation. Products that adapt to the way you work.How we build

SYSTEMS, NOT JUST SCREENS

Interactive Backend & CLI

Inspect the building blocks behind QZDE: async .NET services, real-time events, containerized deployment, and queryable JSONB data.

.NET 10 PostgreSQL SignalR Docker

qzde-core / Program.cs RUNNING

Program.cscsharp

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSignalR();
builder.Services.AddNpgsqlDataSource(
  builder.Configuration.GetConnectionString("Core"));
var app = builder.Build();
app.MapHub<SpreadHub>("/hubs/spreads");
await app.RunAsync();

UTF-8LFcsharp

WHAT WE DO

Full-cycle studio.
Product engineering lab.

Strategy, design, development, launch, and engineering support for B2B products.

Web development & SaaS

B2B sites and SaaS products, from architecture and UX through production on .NET 10, React, Tailwind, PHP/Laravel, and MODX.

.NET 10ReactLaravelMODX

PWA & mobile clients

Mobile experiences with geotracking, push events, and reliable offline sync.

PWALive trackingOffline-first

B2B microservices & payments

Services and payment orchestration for USDT TRC-20, Papara, iyzico, and card flows.

MicroservicesPayment routing

IT staffing & high-load systems

Engineering capacity for teams and high-load .NET systems with DevOps and Docker.

.NETDevOpsDocker

PWA / REAL-TIME OPERATIONS

Live Tracking · PWA / real-time operations

Coordinates, PWA clients, and offline sync queues in one operations workspace.

How tracking worksUI preview · sample feed

The PWA or agent sends coordinates to change its status from stale to active/live. The green indicator means data is flowing. Stop tracking pauses intake. Spreads and events are shown in Arbitrage Stream.

Connection

SignalR · WebSocket ready24 ms

LIVE MAP2 active · updates < 2 min

Antalya, TR

TRACKS4 agents

stale

SYNC QUEUEoffline-first · retry ready

03 pending

location.batch 2 events route.checkpoint 1 event auto-sync enabled

ARBITRAGE STREAMlive event log

STREAMING

12:41:08PWA location syncedTimon · 36.88846, 30.69453

12:40:52Route deviation detectedArbitrage rule · zone 04

12:40:31Offline queue replayed3 events · Markus device

DYNAMIC CMS / EDITORIAL

Knowledge at work.
Code without the noise.

Team blog posts, news, and short code snippets with topic filters and a live publication preview.

C# · .NET 10 PUBLISHED

Minimal API: typed responses without the boilerplate

A compact endpoint with request validation and explicit HTTP responses for a production API.

Program.csC#

app.MapPost("/api/agents/ping", async (AgentPing ping, IAgentService agents) => {
    var result = await agents.UpdateLocationAsync(ping);
    return result is null
        ? Results.NotFound()
        : Results.Ok(result);
})
.WithName("PingAgent")
.RequireAuthorization();

SYSTEM DESIGNQZDE / PRINCIPLES

Business applicationsHospitality · fintech · customYOUR PRODUCT

Plugin modulesIndependent · composable · extensiblePLUG & PLAY

QZDE CoreAsync engine · .NET 10 · SignalRTHE FOUNDATION

InfrastructureDocker · Linux · PostgreSQLPRODUCTION READY

Built with security in mindv10.0 / stable

ONE CORE. MANY POSSIBILITIES.

A flexible platform.
Not a fragile pile of tools.

We evolve our C#/.NET framework to build systems faster without limiting product growth.

Modular, not monolithic

Add business capabilities without risking the core.

Realtime is built in

Events and async are fundamental to the architecture.

Your data stays yours

PostgreSQL, JSONB, and zero-knowledge where it matters.

Technology stack

UNDER THE HOOD

Technology we trust.

A proven stack for predictable performance and maintainability.

C# / .NET 10Core runtime

PostgreSQLPrimary data

SignalRLive transport

DockerContainers

SQLiteEdge nodes

PlaywrightBrowser agents

HestiaCP / FornexVPS hosting

PHP / LaravelWeb applications

LET’S BUILD SOMETHING REAL

Have a challenge
that is ready to solve?

Tell us about your product, integration, or process. We’ll discuss architecture and next steps.

Email us