banditz

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Research Bug bounty at javahack team · 25+ years experience

Freeland Reseacrh Bug Bounty

About banditz

Freeland Reseacrh Bug Bounty in Hackerone, Intigriti, Bugcrowd

Articles by banditz (5)

Backend Engineering | banditz

How to Implement JWT Authentication Properly — Access Tokens, Refresh Tokens, and Common Mistakes

Most JWT tutorials store tokens in localStorage and skip refresh flow. Here's how to implement JWT auth that actually holds up in production — proper token pairs, secure storage, and revocation.

Jan 9, 2026

#JWT authentication #access token refresh token #JWT best practices

Diagram showing JWT token flow between client and server

Database Systems | banditz

How to Diagnose and Fix MySQL Replication Lag

Your replica is 300 seconds behind. Reads return stale data and users see ghost records. Here's how to find the cause and fix it without breaking replication.

Jan 7, 2026

#MySQL replication lag #fix replication delay #Seconds_Behind_Master

MySQL SHOW REPLICA STATUS showing high Seconds_Behind_Master

Cyber Security | banditz

How to Audit Linux File Permissions and Find Security Holes

Someone ran chmod 777 to fix a permissions error. Now your server has a gaping hole. Here's how to audit file permissions and find dangerous misconfigurations before attackers do.

Jan 5, 2026

#Linux file permissions #chmod security #SUID SGID audit

Linux terminal showing find command results for SUID files

Cyber Security | banditz

How to Harden SSH and Stop Brute Force Attacks on Linux Servers — Read the Logs Before You Lock the Door

Every Linux server with SSH exposed to the internet gets hammered by brute force bots within hours of going live. Most admins just change the port and call it a day. But if you actually read /var/log/auth.log, you'd see that the bots adapt — they rotate usernames.

Jan 3, 2026

#SSH hardening #brute force attack prevention #fail2ban SSH

Linux terminal showing auth.log with failed SSH login attempts and fail2ban blocking IPs

Database Systems | banditz

How to Find and Fix Slow Queries in PostgreSQL — Read EXPLAIN ANALYZE Before You Add Random Indexes

Your API endpoint takes 4 seconds to respond. Your dashboard loads like it's 2003. Someone suggests "just add an index" without even looking at the query plan. Stop. The problem might not be a missing index at all — it could be stale statistics, a bad join order, an ORM generating garbage SQL.

Jan 1, 2026

#PostgreSQL slow query #EXPLAIN ANALYZE PostgreSQL #PostgreSQL query optimization

PostgreSQL EXPLAIN ANALYZE output showing sequential scan bottleneck with actual time highlighted