Hi! I'm Marcus 👋
Full Stack Ruby on Rails Developer based in Copenhagen
Building systems that scale and companies that last
Building & Leading
Currently freelancing as Tech Lead for Autobutler, where I've helped reduce team size from 11 to 4 while maintaining throughput, saved 2M+ DKK in recurring tech costs, and enabled multiple millions more in savings through headcount optimization.
Previously co-founded ProCollective, a freelance management platform that was used by companies like Publicis Groupe.
Experience at Scale
I've built systems serving millions of users - from education platforms monitoring 2M+ Danish citizens at UNOIT (later acquired by EG) to mobile ordering systems and Ruby on Rails monoliths handling complex business logic across multiple countries.
Investor & Advisor
Investments: Fortunate to participate in investments in some of the world's most ambitious companies including SpaceX, Anduril, Groq, and xAI.
Advisory: I advise technical teams on architecture and perform due diligence for VCs.
From Side Projects to Companies
I've co-founded multiple startups, built gaming communities with 100K+ players, and even ran a profitable operation as a 12-year-old. I love turning ideas into reality and learning from every project along the way.
How I Work
Operating principles
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Ship outcomes, not tickets. Focus on business impact and clear success metrics.
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Reduce complexity. Prefer simple designs that scale and are easy to maintain.
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Ownership end‑to‑end. From discovery and architecture to delivery and iteration.
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Measure, learn, iterate. Use data and feedback loops to continuously improve.
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Communicate clearly. Align stakeholders early, write things down, and remove ambiguity.
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Bias to action. Small, reversible changes over big‑bang rewrites.
Recent results
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Autobutler: reduced annual tech spend by 2M+ DKK, maintained delivery velocity while rightsizing engineering from 11 → 4, enabled multi‑million DKK savings via org simplification, and had a drastic positive impact on the bottom‑line.
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UNOIT: delivered national‑scale education systems serving 2M+ Danish citizens; the business was later acquired by EG.
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Mindpool: advised on product and technology; the company was later acquired.
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VC diligence: performed technical due diligence for a VC across early and growth‑stage opportunities.
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ProCollective: co‑founded and secured adoption by Publicis Groupe while active.
What I'm great at
Ruby on Rails at scale
Monoliths with clear boundaries, fast iteration, and reliable performance.
Pragmatic architecture
Make real tradeoffs, create migration paths, and keep options open.
Tech leadership
Align teams around outcomes, simplify roadmaps, and raise the bar.
Let's Connect
I'm always interested in hearing about new projects, opportunities, or just having a great conversation about technology. Feel free to reach out!