Marco Alphenaar.

Full-stack developer. SaaS platforms, PWAs and hand-built websites, engineered under pressure and finished like ice.

STRATUM 01 · WHO

I build software the way glaciers work: slow pressure, hard results.

Since 2022 I've been shipping custom websites, SaaS products and internal tools from Haarlem. No templates, no shortcuts. Every pixel and every query set by hand.

A good build is like clear ice: you only notice the work when it's missing. Fast to load, high in Google, and cold-blooded about turning visitors into customers.

10+: live builds
4+: years experience
3: own products

STRATUM 02 · FLAGSHIP WORK

Specimens, preserved in ice.

SPECIMEN ASAAS · 2025

Prijspijl

Market-accurate price indications for cars and motorcycles. A commercial SaaS used by private sellers and dealers across the Netherlands.

Valuation engine
NL market
Dealers + private

SPECIMEN BSALES INTEL · 2026

LeadRadar

Finds companies with slow websites and ranks them as prospects. PageSpeed scanning, Pipedrive CRM sync and AI-generated call scripts.

PageSpeed scans
Pipedrive
Claude API

SPECIMEN CPWA · 2025

Forge

A fitness-tracker PWA that installs straight from the browser. Offline-first workout logging that lives on your phone, not in a store.

PWA
Offline-first
Installable

STRATUM 03 · CLIENT SITES

Built for others.

BEDROCK · CONTACT

Let's build something cold-blooded.

One developer, direct contact, no account managers in between.

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