Been building systems professionally since my teens.
Avid reader of philosophy and literature. Learned by doing: software by building it, Eastern European politics by spending time on the ground and talking to everyone from taxi drivers to oligarchs in saunas.
Learned OPSEC and the adversarial mindset the hard way — because my life depended on it.
2026 — current
Cockroach Systems ApS — offensive security research.
- Became OSCP Certified
- Building proprietary C2 system
- Publishing at cockroach.systems
- 100+ CTF machines completed
- Three months living and studying in Estonia
- Studying at Maldevacademy
Tech: C, Rust, Python, nix, zig, other, windows internals...
2025
Built a sovereign homelab. OSCP studies. Months spent traveling balkans and Romania.
2024
Period of recovery and bereavement.
2023 — ISR Operator, International Legion, Ukraine
Volunteered with an independent unit operating under experienced military leadership, working alongside a multinational team.
- Certified drone pilot (military academy certification)
- Aerial and foot reconnaissance
- Civilian liaison and logistics coordination for a support network
- Contributed to team OPSEC and digital-security standard operating procedures
- Coordinated a multi-day tactical training program for incoming personnel
2022 — Monthio / Ukraine
Volunteer refugee support. Travelled Ukraine extensively — Kyiv, eastern front, Dnipro. Trained with various groups before committing to deployment in 2023.
Returned to data engineering at monthio. Rewrote ETL/analytics pipelines. Backup and DR procedures. Optimised data warehouse — ~1000x query speedup. Mentored analysts.
Tech: Azure Synapse, Scala, Apache Spark
2020–2021 — Visma / Ukraine
Large-scale property valuation system for the Danish Ministry of Tax. Notorious project.
Orchestration team — distributed state machine, frontend/backend integration, architecture planning. Implemented a VPN client in Clojure.
Left Aug 2021 to road trip western Ukraine. Learned blockchain, culture, history, politics.
Tech: Clojure, Java, ClojureScript, JS, PostgreSQL, Docker, AWS
2018 — Monthio
First technical hire and lead developer at a PSD2 credit scoring startup. Full ownership of architecture — Azure data lake, ETL pipeline, C# backend, government integrations. Hiring and business development.
Tech: C#, MSSQL, Python, ReactJS, Azure
2016 — Maar Consulting
Digital signage system for Copenhagen International School. 100+ screens. Android device management, fullstack scheduling system. Sole developer.
Tech: PostgreSQL, ReactJS, Cordova, NodeJS
2014–2018 — Wemuda
Co-founder, age 16. Consumer transparency app (Detectox) — barcode scanning against ingredient/nutrition criteria. Reverse engineered Rema 1000's Android app to extract product API endpoints. DTU contract (250.000 DKK). TV2 press coverage. Company still alive.
Tech: PostgreSQL, C#, Python, AWS, AngularJS, Cordova
Education
- HTX Hillerød — 2014–2017
- Københavns Universitet — Data science (2018–2019, left for industry)
- Applied Stoicism — life
Self-study
Threat intelligence, Russian doctrine and information warfare, totalitarianism and propaganda, behavioural manipulation, risk and complexity, classical philosophy. Seneca, Greenberg, Arendt, Miłosz, Zuboff, Bezmenov, Taleb, KUBARK.
Certifications
- OSCP
- Boryviter Military Academy — ISR Drone Pilot Certification
Conferences
- Confirmed speaker at ICS CPH 10th Anniversary, November 2026
Contact
Codeberg: https://codeberg.org/captn-r0ach