● Full-stack development & systems architecture

We build the backend, the API, and the pipeline that hold a real product together.

KeyTechGrp designs and ships full-stack applications, API integrations, and the database architecture and CI/CD infrastructure behind them — built to run production workloads, not demos.

Capabilities

End-to-end application development — from schema design through deployment.

01 Python / FastAPI

Production APIs and backend services — authentication, background jobs, webhook processing, third-party integrations.

02 PostgreSQL / SQLAlchemy

Multi-tenant schema design, migrations, and data modeling built to hold up under real usage and change over time.

03 Next.js / TypeScript

Web front-ends and dashboards wired directly into the same APIs powering the backend — no throwaway prototypes.

04 Docker / GitHub Actions

Containerized services with CI/CD pipelines for build, test, and deploy — repeatable from dev through production.

Lodgify Co-Host Platform

A multi-tenant platform built to run the operational side of short-term rental co-hosting.

Multi-tenant co-hosting platform

Runs on our own self-hosted infrastructure, with a FastAPI backend and Next.js frontend, integrating directly with the Lodgify API to automate guest communication, accounting, and property operations. In use for our own and managed properties.

In use

Architecture

  • Multi-tenant PostgreSQL schema
  • ADR-driven design discipline
  • Raw payload retention for audit & replay

Integrations

  • Lodgify API (bookings, guests, properties, messages)
  • Bigcapital accounting ledger
  • Google sign-in (OAuth / OIDC)

Infrastructure

  • Dockerized services on self-hosted Proxmox
  • Private network only, no public exposure
  • GitHub Actions CI/CD to a staged QA environment

Approach

Practices that hold up once a project is no longer new.

Architectural decision records

Design decisions are documented as they're made, so the reasoning behind the system survives past the person who wrote it.

Schema-first data modeling

Multi-tenant and relational structure is designed deliberately up front, not patched in after the first migration headache.

Soft-coding over hard-coding

Business rules and configuration live in data, not scattered through conditionals — so change doesn't mean a redeploy.

Raw data retention

Original payloads from every integration are kept, so nothing downstream is a black box when something needs to be replayed or debugged.

Let's talk about what you're building.

Full-stack development, API integration work, and systems architecture. Send a message and we'll follow up by email.