Fathin Dosunmu Technical founder & engineer

I build AI products from scratch and write about what it takes to make them useful in the real world.

Today I’m Founder & CTO at CodesDevs in Tallinn. Previously, I built production fintech at Monese and Zing and worked as a founding engineer at Solitude.

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Selected work

ELAV

An AI executive assistant that handles the mechanical work—connecting context, finding evidence, preparing action—while keeping judgment with the people responsible.

 BackToBirth AI

Aviation certificate verification, built from scratch. AeroBench scores 95.8% F1 across 141 real certificates.

 AgentSIM

A telecom identity layer for browser agents that hit SMS and OTP verification in real workflows.

 Solitude

Founding engineer across product, source access, context and memory, identity, billing, and production delivery.

 Prism

An open-source adversarial AI system where one agent proposes and another is paid to find the flaw.

Security lens

More security writing ↗

Security is part of how I shape a product, not a review I leave until the end. I work across identity and permissions, trust boundaries, sensitive data flows, abuse cases, auditability, and the failure modes around AI agents.

  • Product security
  • Identity & authorization
  • Threat modelling
  • Agent trust & auditability
2024 · MSc thesis Exploring the Complexity Criteria of Mobile Malware: an Examination of its Impact on the Analysis Process Research on how mobile-malware complexity changes the analysis process. 2022 · Medium The Ultimate Secret to Red Team Engagements Planning, scope, and communication as security controls. 2022 · Medium Alfred — TryHackMe walkthrough Hands-on exploitation, initial access, and Windows privilege escalation.

Recent field notes

Follow along ↗
Apr 2026 · DEV Why Claude Code Agents Get Stuck on Phone Verification The identity bottleneck that stops autonomous agents in real workflows. Jan 2026 · Substack Your AI Agent Doesn’t Remember Anything We keep calling things “memory” that aren’t memory.
Elsewhere: Substack ↗ Medium ↗ DEV ↗

IRL

01 / 03 Talking through ELAV with the room.

About

Fathin smiling in a candid low-light photograph
Somewhere between builds.

I’m drawn to the early, messy stage—shaping the idea, building the product, and figuring out how it becomes useful in the real world.

Cybersecurity by training; product building by practice. My MSc thesis at TalTech examined how mobile-malware complexity changes the analysis process. That same security lens now shapes how I think about identity, permissions, attack paths, and operational risk.

Let’s chat

DM me on X or LinkedIn with whatever you’ve got on your mind—a product idea, a strange technical problem, or something still half-formed.

DM me on X ↗ Message me on LinkedIn ↗