PRODUCT ENGINEER

LEO AFRINGAN

AI-native product systems
Architecture · Infrastructure · Execution
Clarity × Scalability × Speed

Overview

AI-native product systems designed for reliable execution at scale. Work spans infrastructure, asynchronous backends, and production architecture with explicit operational control.

Turning complex systems into scalable products.

System architecture illustration

System Focus

  • Design modular architectures that remain readable as systems grow.
  • Build async backends with boundaries, retries, and failure isolation.
  • Run observability-first execution with metrics, tracing, and actionable logs.
  • Deliver with performance budgets, safety rails, and controlled rollout.

System Impact

Modern products fail less from missing features and more from weak system design: unclear boundaries, fragile async workflows, and limited observability.

Architecture-first execution turns complexity into reliability through contracts, isolation, measurable performance, and controlled rollout. The result is faster iteration without destabilizing production.

Writing

View all (8)

Observability Is Not Monitoring

On system clarity, execution discipline, and production thinking.

Jan 2026

Designing Systems That Can Change (Before They Scale)

A lot of system design conversations start with scale.

Dec 2025

Architecture Isn’t Diagrams — It’s Decisions

Most people think system architecture starts with diagrams.Boxes, arrows, services, clouds

Nov 2025

AI Prevents Organized Human-Led Cyber Attacks

How OpenAI-Powered Systems Strengthen Modern Infrastructure Security

Dec 2025

How to Rescue a Broken Ubuntu System

Budgets, rollouts, and reliable iteration under load.

Sep 2025

Why Linux Kernel is the Beating Heart of Technology

Imagine a world where you—not tech giants—control the very core of your computer.

Sep 2025

Investigating High Disk I/O in Linux - Using iostat, iotop, and Visual Analysis

In Linux systems, disk performance is crucial for overall system responsiveness.

Sep 2025

How to Investigate a Compromised Linux Server

When a Linux server is compromised, every second counts.

Sep 2025

Field Notes

Snapshots from on-site work in datacenter and production environments — focused on infrastructure deployment, hardware validation, and network troubleshooting.

Rack Maintenance Session
Cabling & Patch Verification
Server Room Walkthrough
Deployment Validation
Network Hardware Review
Infrastructure Checkpoint

Production Systems Philosophy

Systems should scale without losing clarity.
Complexity must be structured, not hidden.
Architecture is not overhead — it is long-term velocity.

How I Build Production Systems

Architecture

  • Explicit service boundaries and contracts
  • Failure isolation and controlled degradation
  • Measurable interfaces and versioned evolution

Execution

  • Incremental rollout with safety checks
  • Observability-driven validation before scale
  • Backward-compatible change management

Infrastructure

  • Containerized services and reproducible environments
  • Deployment discipline with environment separation
  • Monitoring, logging, and alerting integration

Work

Selected systems built for long-term production.

AI Structured Product System

(Independent system architecture · 2025)

AI-native structured product system.

  • Deterministic pipelines with built-in safety rails.
  • Modular orchestration with clear feature boundaries.
  • Observability-led execution with retries and isolation.

Payment Infrastructure Layer

(Independent system architecture · 2025)

Modular multi-provider transaction architecture.

  • Provider abstraction with a consistent verification flow.
  • Internal credit layer with extensible gateway paths.
  • Audit-friendly lifecycle states with admin visibility.

Shared Production Capabilities

Deterministic execution Contract-driven evolution Fault isolation Idempotent flows Observability-first design Operational visibility

Built with production constraints in mind: safety, observability, and controlled change.

Systems Designed for Longevity

I design production systems for longevity — where structure, clarity, and operational discipline scale together. My focus isn’t short-term feature velocity — it’s resilient and measurable system evolution.

Architecture is a long game — I build systems that are meant to survive it.

Designed for production constraints — safety, observability, and controlled change.

About

I build production systems at the intersection of AI, infrastructure, and disciplined execution — focused on reliability, operational clarity, and long-term scalability.

How I Work

Currently focused on production-grade AI systems and infrastructure-aware execution.

Let’s connect

Contact

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Responses typically within 24–48 hours.