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.

Start a conversation → See the studio ↗ GitHub ↗

Selected work

ELAV

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

BackToBirth AI

Aviation certificate verification built from scratch, with an open benchmark spanning 95 real-world certificates from 40+ organizations.

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.

CodesDevs

Work with us ↗

When a project needs more than one pair of hands, I build through CodesDevs, my custom software boutique for founders and teams taking technically difficult products from the first product decisions to production. We work across product strategy, architecture, implementation, and the operating details after launch.

  • AI agents
  • Workflow automation
  • Security-sensitive software

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 / 14 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 ideas, building products, and making them useful in the real world.

Cybersecurity by training; product builder by practice. My MSc thesis at TalTech explored how mobile-malware complexity changes analysis. That security lens still shapes how I think about identity, permissions, attack paths, and operational risk.

I started teaching myself HTML and CSS at 13 or 14. The pull remains the same: understand how things work, spot patterns across fields, and build something useful.

Outside work, I’m into art, sci-fi, music, travel, space, finance, sport, health, and fitness.

Let’s chat

DM me on X or LinkedIn with whatever you’ve got on your mind, whether it’s a product idea, a strange technical problem, or something still half-formed. If it needs a team, I build through CodesDevs.

DM me on X ↗ Message me on LinkedIn ↗ CodesDevs ↗