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Gwer Donatus

Backend & AI Engineering

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donatusgwer@gmail.com

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Field Notes

Engineering process, system design decisions, and the occasional deep dive into things that break in production.

Backend Engineering01

Designing Distributed Ledgers: Lessons from Building TxCore

12mDecember 15, 2024

Security Engineering02

Breaking My Own Crypto App Before Anyone Else Can

11mJuly 20, 2025

Backend Engineering03

Async Python Patterns for High-Throughput Systems

8mNovember 20, 2024

Building AI Products: From Prototype to Production

10mOctober 5, 2024

Backend Engineering05

PostgreSQL at Scale: Patterns That Work

15mSeptember 12, 2024

Backend Engineering06

Building Reliable Webhook Delivery Systems

11mAugust 28, 2024

Security Engineering07

The Missing Trust Layer in AI-Powered Financial Systems

14mJanuary 10, 2025

Security Engineering08

Building Sentinel: Phase 1 — Laying the Foundation

16mJanuary 17, 2025

Security Engineering09

How Do You Audit What an AI Agent Does?

18mFebruary 5, 2025

Security Engineering10

Building Sentinel: Phase 3 — Risk Intelligence & AI Actor Tracking

22mFebruary 12, 2025

Security Engineering11

The Investigation Problem: Why Security Events Mean Nothing Without Context

12mFebruary 26, 2025

Security Engineering12

Building Sentinel: Dashboard & Compliance Reports

20mMarch 5, 2025

Security Engineering13

The Operational Envelope: Why Good Code Isn't Enough

11mApril 2, 2025

Security Engineering14

Building Sentinel: Kubernetes, Alerting & CD Pipeline

17mApril 9, 2025

Backend Engineering15

Building Proova: Tracking Revenue Through WhatsApp, DMs, and Offline Payments

20mJune 15, 2024

Backend Engineering16

Proova Field Notes: What Offline Attribution Taught Me About Trust

Backend Engineering17

Building TxCore: Distributed Ledgers, Idempotency, and the Saga Pattern

24mNovember 20, 2023

Backend Engineering18

TxCore Field Notes: Idempotency Is the Whole Game

7mDecember 5, 2023

Backend Engineering19

Building Naija Co-op Hub: Escrow, Loans, and Multi-Tenant Security in a Cooperative Marketplace

21mMarch 10, 2023

Backend Engineering20

Naija Co-op Hub Field Notes: Why Cooperatives Need Different Software

5mApril 18, 2023

Backend Engineering21

Building Jos Eventia: Escrow Bookings and Trust in a Local Vendor Marketplace

17mAugust 15, 2022

Backend Engineering22

Jos Eventia Field Notes: The Chicken-and-Egg Problem Is Technical Too

5mSeptember 22, 2022

Backend Engineering23

Building ThriftbyZee: Search, Recommendations, and the Visual Nature of Fashion Commerce

16mMay 10, 2022

Backend Engineering24

ThriftbyZee Field Notes: Image Quality Is a Backend Problem

4mJune 20, 2022

Frontend Engineering25

Building GITS: Performance, Animation, and the Agency Website as Proof of Work

14mFebruary 15, 2022

Frontend Engineering26

GITS Field Notes: Performance Is the Portfolio

4mMarch 8, 2022

Financial Infrastructure27

Building Drift Recon: Confidence-Weighted Matching and Statistical Drift Detection

19mSeptember 15, 2024

Financial Infrastructure28

Drift Recon Field Notes: Mismatch Is a Symptom, Not a Diagnosis

5mOctober 2, 2024

SaaS Platform29

Building FinOps Ops Console: Refund Risk as a Time-Sensitive Workflow

15mJuly 20, 2024

SaaS Platform30

FinOps Field Notes: Chargebacks Are a Refund Problem in Disguise

4mAugust 5, 2024

Financial Infrastructure31

Building LedgerLens Recon: Why Not Every Reconciliation Problem Needs Kafka

13mMay 10, 2024

Financial Infrastructure32

LedgerLens Field Notes: The Best Reconciliation Tool Is a Spreadsheet

SaaS Platform33

Building an Alerts Monitoring Dashboard: Self-Referential Hierarchies and Idempotent Actions

14mFebruary 15, 2024