Building things that make systems understandable
Performance engineering, AI integration, and systems thinking for organizations navigating complexity. Based in Sweden.
"The liminal space is where transformation happens — the threshold between what was and what will be."The philosophy behind Proliminal
Services
AI Integration
Helping organizations adopt AI meaningfully — from strategy to implementation. Agent architectures, LLM integration, and AI-first development frameworks.
Performance Engineering
Load testing, performance analysis, and systems optimization. Six years of deep domain expertise in mission-critical forestry logistics systems.
Systems & Observability
Making complex systems understandable through visualization, flow modeling, and developer tooling. From architecture to the user interface.
UX & Usability
Interfaces that serve people. Bringing empathy and usability thinking to technical products — because good systems deserve good interfaces.
Architecture
Distributed systems, event-driven architectures, and protocol design. Building foundations that scale with clarity.
Transformation
Guiding teams and systems through the liminal space — from legacy to modern, from manual to automated, from opaque to observable.
Selected Work
FlowTime (Research)
Spreadsheet-like, deterministic, discrete-time graph engine for flow modeling and time-travel observability.
LodeTime (Research)
A living, always-on development companion — watches code, understands architecture, runs tests, integrates with AI.
A2UI Protocol
Agent-to-UI protocol implementations — agents send declarative JSON component trees; the client renders approved widgets.
Agent Lens
VS Code extension that makes AI coding agents observable. Works with GitHub Copilot and Claude Code.
AI-First Framework
Portable AI-assisted development framework with role-based agents, reusable workflow skills, and guardrails.
Biometria
Six years of performance engineering and systems work for Sweden's forestry measurement industry. Long-term client engagement.
Daklapack Europe
Mission-critical production system for medical self-test kits. When a legal freeze killed all Azure assets, rebuilt the entire system on-prem in days — zero downtime, zero tolerance for errors.
About
Peter Bruinsma is a consultant and technologist with over 30 years of experience across the USA, the Netherlands, and Sweden. He started his career at Microsoft in Redmond, later returning to Microsoft in the Netherlands as an application development consultant. In 2000 he founded CraitonTesting AB, an independent test house specializing in hardware and system certification for international manufacturers, which he ran for 13 years.
Most recently, he spent six years with Biometria — Sweden's central measurement organization for the forestry industry — doing performance engineering and systems work on mission-critical platforms handling over a million transactions per day.
Today, his focus has shifted heavily toward AI — not just as a technology to integrate, but as a fundamental shift in how we build, observe, and interact with software systems. His open source work reflects this: tools for AI agent observability, agent-to-UI protocols, and frameworks for AI-first development.
He believes that the best technology is technology you can understand. This conviction drives everything from his approach to systems architecture to his deep interest in UI/UX and usability. Good interfaces are acts of empathy.
About the name ProLiminal →Approach
Proliminal takes its name from liminality — the transformative space between what was and what will be. Every engagement follows this arc:
Understand
Map the current state. Listen deeply. Identify the real constraints and the real opportunities hiding in the system.
Transform
The liminal phase. Navigate the uncertainty between old and new. Prototype, test, iterate. Embrace productive chaos.
Emerge
Arrive at clarity. Systems that are observable, performant, and understandable. Knowledge transferred. Autonomy restored.
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Looking for a consultant who brings both deep technical expertise and genuine care for how systems serve people? Let's talk.