Active
Co-Founder & Engineer
— Elixify · Kollega.aiCo-built two production AI platforms — agentic tooling for hiring and for business optimisation — from architecture to launch.
2 AI platforms in productionTypeScriptAI AgentsProduct
Norway · Available for select work
Software engineer
& growth operator.
I’m Hafsteinn Runarsson. I design and ship AI systems, growth algorithms, and custom software for businesses. Recent work has taken an artist from zero to five million listeners in 90 days and put more than $5M in tooling into production.
Featured & trusted by
BBCNBCCoca-ColaSpotifyThe Times
Selected experience
01
Software Engineering
Production software, shipped fast. Full-stack products, AI agents, and the tooling that runs underneath them.
2023 — Now
Solo Engineer
— Custom Software & ToolsSolo-shipped a product that generated $900K for a client in week one, then co-built ten-plus more tools on top of it.
$5M+ shipped across 10+ toolsFull-stackNext.jsPostgreSQL
02
Marketing & Growth
Engineered growth, not luck. Algorithmic distribution, brand, and campaigns that move real numbers.
90-day sprint
Growth Engineer
— Spotify Artist GrowthBuilt a growth-algorithm system that took an artist from zero to five million monthly listeners. Picked up by BBC and NBC.
0 → 5M listeners · BBC · NBCGrowthAlgorithmsSpotify API
2026
Campaign Concept
— Coca-Cola NorwayConcepted a $100K campaign for Coca-Cola's 100-year Norway anniversary, including a custom mobile game. Slated for Oslo, summer 2026.
$100K campaign conceptCreativeBrandGame Concept
Ongoing
Co-Founder
— Apparel BrandGrew a clothing label from zero to outfitting artists with a combined 100M+ streams worldwide.
100M+ streams styledBrandSocialOps
About
An operator who codes, and a coder who sells.
For years I’ve worked at the seam where code meets audience: algorithmic growth, solo-shipped software, and creative campaigns. Two AI platforms co-founded, a faceless content network running on autopilot, and a handful of products that quietly moved real money.
Now I do that for a few businesses at a time, through Daia. If there’s a system in your business that should be running itself, I build it — then hand you the keys.
LANGUAGES
- TypeScript
- Python
- JavaScript
- SQL
- Bash
AI / ML
- OpenAI SDK
- Anthropic SDK
- LangChain
- Embeddings
- Agent design
- Prompt engineering
PRODUCT / GROWTH
- Algorithm engineering
- Automation pipelines
- Spotify API
- YouTube API
- n8n
- Growth systems
CREATIVE / BRAND
- Figma
- Graphic design
- Brand direction
- Motion
- Content strategy
- Campaign design
ContactHave a system that should
Have a system that should
be running itself?
Open to select projects · 2026