Deji Fatoye

The author

Building systems
that don't break.

SRE & Infrastructure Lead · Lagos, Nigeria

The work

What I actually do.

I lead infrastructure and reliability for a payments platform processing well into the millions of transactions a day. My job, on a good week, is invisible. On a bad week, it is keeping things together while we work out which queue silently dropped what.

Before that I spent five years across fintech and health-tech across the continent — places where the network is hostile, the power is suspect, and the engineering culture is being built in real time. That is the lens I write from.

What I write about

Three threads.

SRE & Reliability

Runbooks, on-call, SLOs that mean something, and the rigour that keeps you online.

System Design

How to actually think about scale, consistency, failure modes, and trade-offs.

Software Engineering

Code, craft, and the quiet decisions that compound over years.

Why I write

The ledger of what I learned.

I write here because the engineering blog I needed when I was 24 didn't exist. There was a flood of frameworks and a drought of judgment. People sharing the wins, almost nobody sharing the trade-offs.

I want this site to be honest field notes. Not thought leadership. Not a portfolio. A ledger of what I learned, written down so the next person doesn't have to learn it the same way.

From Lagos, with the assumption that the network will fail. That is not a constraint — that is an education.

The path so far

Timeline.

2024 — present

Senior SRE & Infrastructure Lead

Confidential, Lagos

Leading platform reliability for a high-throughput financial system across two regions.

2022 — 2024

Staff SRE

Series B Fintech, Remote

Built the on-call programme from scratch, ran SLO migration across 40 services, halved MTTR.

2019 — 2022

Backend & Infrastructure Engineer

Pan-African Health Tech

Designed and shipped multi-tenant infrastructure serving 14 countries.

2017 — 2019

Software Engineer

Lagos consultancy

Cut my teeth on production systems for banks, telcos, and government services.

Built with LokalEdge

A Lagos-based engineering studio.

dejifatoye.dev was designed and built by LokalEdge — an engineering studio building serious products with West African teams, for global users.