High-Concurrency Full-StackProduction

Hosto

Property Reservation Platform with Host Approval Lifecycles & Turnover Buffers

Visit Production App (hosto.k79.quest/)GitHub Repository

100%Approval LifecycleHost-managed reservation workflow

< 250msUpload LatencyDirect-to-S3 presigned pipeline

100%Buffer AccuracyAutomated turnover windows

01.The Problem & Why Naive Implementations Fail

Short-term rental platforms often suffer from uncoordinated scheduling, lack of maintenance turnover time between guest check-ins, and heavy media upload bottlenecks on web application servers.

02.Architectural Solution & Engineering Decisions

Architected a property booking system with host approval workflows, automated maintenance turnover buffers factored directly into reservation intervals, and direct S3 presigned uploads to keep API servers lightweight.

Key Architectural Highlights

PostgreSQL Range Exclusion Constraint

Enforces mathematical non-overlap at the database storage engine level, making concurrent double-booking physically impossible even under simultaneous distributed writes.

Verified Implementation Pattern:

ALTER TABLE "Reservation"
ADD CONSTRAINT no_overlapping_bookings
EXCLUDE USING gist (
  property_id WITH =,
  tstzrange(check_in, check_out, '[)') WITH &&
);

Dynamic Housekeeping Turnover Buffers

Property-specific turnaround windows are factored directly into reservation intervals, preventing back-to-back check-ins prior to room turnover.

Adaptive Direct S3 Presigned Uploads

Presigned S3 upload architecture supporting path-style addressing for local development (MinIO/RustFS) and virtual-host addressing in cloud production.