---
title: "Konstantin (@C0nstanta) | Hashnode"
description: "Senior Software Engineer working on backend systems, data pipelines, and demand forecasting."
url: "https://hashnode.com/@C0nstanta"
---

@C0nstanta

# Konstantin

@C0nstanta · Joined January 2026

### [Crash-safe JSON at scale: atomic writes + recovery without a DB](https://c0nstanta.hashnode.dev/crash-safe-json-at-scale-atomic-writes-recovery-without-a-db?utm_source=hashnode&utm_medium=feed)

How we hardened file-based JSON storage in a Flask app - atomic writes (fsync+os.replace), rolling .bak, and forensic-safe recovery reads.

15 min read · [c0nstanta.hashnode.dev](https://c0nstanta.hashnode.dev/crash-safe-json-at-scale-atomic-writes-recovery-without-a-db?utm_source=hashnode&utm_medium=feed)

[Jan 5](https://hashnode.com/posts/crash-safe-json-at-scale-atomic-writes-recovery-without-a-db/695b7dc265de715b6e79b880)

### [Near real-time Server Logs in a Flask Dashboard](https://c0nstanta.hashnode.dev/near-real-time-server-logs-in-a-flask-dashboard?utm_source=hashnode&utm_medium=feed)

Originally published on DEV.to:https://dev.to/constanta/real-time-server-logs-in-a-flask-dashboard-21ad I built an inventory system for warehouse operators. Non-technical people. When something breaks, the conversation goes like this: "It's not work...

6 min read · [c0nstanta.hashnode.dev](https://c0nstanta.hashnode.dev/near-real-time-server-logs-in-a-flask-dashboard?utm_source=hashnode&utm_medium=feed)

[Jan 1](https://hashnode.com/posts/near-real-time-server-logs-in-a-flask-dashboard/6956ca5b2f3573443f56e50e)