Branko (@brankopetric00) / X

Branko

4,613 posts

Branko

@brankopetric00

opentweet.io openreels.io krabb.io

Joined August 2019

Pinned
Branko
@brankopetric00
Apr 16
I told Claude: "write 5 tweets about my landing page" It just did it. Built an MCP server for OpenTweet that connects to Claude Desktop, Cursor, and VS Code. Create tweets, schedule batches, upload media, check analytics, all from a chat prompt.
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4.8K
Branko
@brankopetric00
Oct 26, 2025
CTO asked to reduce S3 costs. We were spending $4,200 monthly on storage. Implemented lifecycle policies: - Move to Glacier after 90 days - Delete after 2 years Cost dropped to $980 per month. Saved $3,220 monthly. DevOps team got praised in all-hands meeting. Three months
643K
Branko
@brankopetric00
Oct 24, 2025
Developer kept complaining our RDS instance was too slow. Wanted to upgrade from db.t3.large to db.r5.8xlarge. Cost increase: $140/month to $3,400/month. I checked query performance first: - Query ran 47,000 times per hour - No indexes on the WHERE clause columns - Missing
293K
Branko
@brankopetric00
Oct 27, 2025
Implemented API rate limiting by IP address. 1000 requests per hour per IP. Perfect protection against abuse. Next week: Legitimate customer hit rate limit. Complained their service was broken. They were behind corporate NAT. 500 employees sharing one IP address. Hit limit in
349K
Branko
@brankopetric00
Oct 24, 2025
User reported: "Search is slow." It took 8 seconds to return results. Elasticsearch cluster looked fine. Query was optimized. Indexes were healthy. I traced the request end-to-end: - Frontend -> API: 45ms - API -> Elasticsearch: 180ms - Elasticsearch query: 220ms - API ->
331K
Branko
@brankopetric00
Oct 21, 2025
Our Docker images had 847 vulnerabilities. All from the base image. We were using ubuntu:latest. The fix: - Switched to distroless images - Reduced image size from 420MB to 28MB - Vulnerabilities dropped to 3 - Container startup time improved by 60% Then discovered our CI/CD
392K
Branko
@brankopetric00
Oct 24, 2025
Company spent $18k/month on Datadog. Leadership loved the dashboards. I dug into what we actually used: - 12 people logged in per month - 89% of metrics never viewed - Alerts had 97% false positive rate (team ignored them) - We were ingesting 2.4TB of logs daily - Retention: 180
427K
Branko
@brankopetric00
Nov 6, 2025
Kubernetes migration almost killed our startup. Where we were: - 8 EC2 instances - Ansible for deploys - Boring but working - $1200/month AWS bill Why we migrated: - New investor wanted 'cloud-native' - Engineers wanted K8s experience - Competitors were using it - Seemed like
1.4M
Branko
@brankopetric00
Oct 24, 2025
Production went down. Load balancer health checks failing. All instances marked unhealthy. SSH'd into an instance: - App: running - CPU: 5% - Memory: 40% - Disk: 15% - Network: fine Manually hit health endpoint: curl localhost/health {"status": "ok"} Worked perfectly. Checked
219K
Branko
@brankopetric00
Oct 30, 2025
A penetration tester got root access to our Kubernetes cluster in 15 minutes. Here's what they exploited. The attack chain: - Found exposed Kubernetes dashboard (our bad) - Dashboard had view-only service account (we thought this was safe) - Service account could list secrets
220K
Branko
@brankopetric00
Oct 22, 2025
Our EC2 bill was $31,000 monthly. 70% of instances ran below 15% CPU. We implemented: - AWS Compute Optimizer recommendations - Downsized 85 instances - Moved dev/staging to spot instances - Scheduled non-prod environments to shut down at night New monthly bill: $11,200 The
259K
Branko
@brankopetric00
Nov 1, 2025
3 years ago, we chose a monolith. Today, that monolith: - Runs in a single ASG. - Deploys in 12 minutes. - Is understood by every engineer. - Has a single, fast test suite. - Costs 1/5th what our 'microservice' platform does. We're now building our second product. It's also a
214K
Branko
@brankopetric00
Oct 21, 2025
Breakdown of AWS outage in simple words 1. Sunday night, a DNS problem hit AWS - DynamoDB endpoint lost 2. This meant services couldn't find DynamoDB (a database that stores tons of data). 3. AWS fixed the DNS issue in about 3 hours. 4. But then EC2 (the system that creates
212K
Branko
@brankopetric00
Oct 28, 2025
Set up Nginx as reverse proxy. Configured upstream to application server on port 3000. Everything worked. Deployed to production. Two weeks later: Random 502 errors. 1-2 per hour. No pattern. Checked: - Application server: Always running - Application logs: No errors - Nginx
176K