Knowledge

Engineering Notes

Practical production engineering lessons, debugging patterns, and system design insights collected from real Rails, DevOps, AWS, and SaaS work.

Tech Leadership & Strategy Tech Strategy for Early-Stage Startups

Jul 06, 2026 · 1 min read

MVP Architecture That Won't Need Complete Rebuilds at Series A

"It's just an MVP. We'll rebuild it later."I've heard this many times.In reality, that "temporary" MVP often becomes the foundation for the next fe...

Tech Leadership & Strategy Rails & DevOps Ecosystem Trends

Jul 02, 2026 · 2 min read

A Founder Told Me SaaS Is Dead. Here's What I Think.

A founder recently told me:"SaaS is dead."Recently, I had a thought-provoking conversation with a connection who's an expert in AI and automation. ...

Engineering for Growth Data Architecture Decisions at Scale

Jun 29, 2026 · 2 min read

Event Sourcing & Audit Trails: Building Immutable Data Architecture

A customer asked a simple question."Who changed this record, and what was the previous value?"We had the current data.But reconstructing the histor...

Engineering for Growth Scaling Challenges & Real-World Trade-offs

Jun 25, 2026 · 1 min read

Webhook Delivery & Reliability at Scale: Ensuring Nothing Gets Lost

"We sent the webhook."The customer replied:"We never received it."That conversation taught us an important lesson about scaling integrations.In a R...

Infrastructure & Architecture System Design Patterns & Trade-offs

Jun 22, 2026 · 1 min read

API Gateway Decisions: Rate Limiting, Auth, and Routing at Scale

Most API Gateway decisions look simple in early-stage SaaS systems.Until traffic and integrations start growing.We faced this while scaling a Rails...

Infrastructure & Architecture DevOps & Infrastructure-as-Code

Jun 18, 2026 · 1 min read

Database Migrations in Production: The Strategies That Don't Break Deployments

A 30-second database migration once delayed an entire production deployment.Not because the migration was wrong.Because it locked a table that was ...

Production & Reliability Rails Performance Tuning & Scaling

Jun 15, 2026 · 1 min read

Caching Strategy That Actually Works: Redis, Fragment, Page Caching Explained

One caching change reduced a Rails endpoint from 1.8 seconds to under 200ms.No database upgrade.No new servers.Just a different approach to handlin...

Production & Reliability Incident Response & Post-Mortems

Jun 11, 2026 · 2 min read

The 3am Incident: How We Debugged a 30-Minute Outage in Production

3:07 AM.Phone rings."Production is down."No engineer likes that message.A few years back, we faced an outage that lasted around 30 minutes on a Rai...

Tech Leadership & Strategy Engineering Culture & Team Scaling

Jun 08, 2026 · 1 min read

Knowledge Sharing at Scale: Documentation, Pairing, and Mentoring

One question I often ask during engineering reviews:"If this engineer goes on leave tomorrow, what stops working?"A few years back, we had a Rails ...

Tech Leadership & Strategy Tech Strategy for Early-Stage Startups

Jun 04, 2026 · 1 min read

Build vs Buy: The Decision Matrix for SaaS Features

One of the most common discussions in early-stage SaaS teams:“Should we build this internally or use a third-party service?”We faced this while sca...

Engineering for Growth Technical Debt & Strategic Refactoring

Jun 01, 2026 · 1 min read

Identifying Technical Debt Worth Paying Down (Not Everything Needs Refactoring)

One mistake we made early in a growing Rails product:Trying to refactor too much at once.Every old module started looking like “technical debt”.So ...

Engineering for Growth Data Architecture Decisions at Scale

May 29, 2026 · 1 min read

SQL vs NoSQL for SaaS: When to Use Each (And Why We Chose Both)

One interesting thing we learned while scaling a SaaS platform:SQL vs NoSQL is rarely an “either-or” decision.We ended up using both.Initially, eve...

Infrastructure & Architecture AWS Architecture & Cost Optimization

May 25, 2026 · 1 min read

RDS Scaling Patterns: When Read Replicas Become Your New Problem

Read replicas solve one scaling problem.Then quietly create another.We saw this in a Rails SaaS system running on AWS RDS.As traffic increased, add...

Infrastructure & Architecture System Design Patterns & Trade-offs

May 21, 2026 · 2 min read

Reduced Operational Complexity by Replacing 7 Applications with a Multi-Tenant Rails Architecture

Most SaaS systems do not become expensive because of traffic.They become expensive because of architecture decisions made too early.Recently, I wor...