Henrik Hallengren

One person. Whole systems. Built end to end.

Most software is assembled by a team and leaks in the seams between them. I design and build complete systems myself, from the business strategy down through product, design, and the code, to the infrastructure it runs on. Strategy to pixel to server, held in one head. That is rare, and it is the whole point.

A house of systems, each built from the same hand and the same doctrine.

Henrik Hallengren
// A few of the brands I've worked with across my career
Google
Samsung
Procter & Gamble
Mondelēz
Panasonic
Pernod Ricard
Ubisoft
Absolut
Corona
Budweiser
Jameson
Kia
Vattenfall
Swedbank

Thirty-plus world-class brands across roles and projects over a career, mostly inside earlier positions, not a claim that I built their internal systems. What it tells you is plain: serious organisations have paid for this judgment, more than once, and I carried the responsibility on record.

The doctrine

How everything here is built.

None of these four principles is exotic on its own. What is uncommon is one person living all four, consistently, across an entire body of work. That is the iPhone logic: nothing in it was unique in isolation; the singularity was the composition. The doctrine is the thread that makes the systems coherent, and it is what the next page is about.

Technology-agnostic

The technology is never the point. The right technology for the actual job is. Every stack is optimised for the problem in front of it and the scale it will one day carry, never for fashion and never for habit.

Trustworthy AI, not a black box

AI belongs in a system only where it earns its place, and only in a form you can trace and defend. Determinism where determinism matters; explainability where a decision has to stand up. Capable, but never opaque.

System-first

The system comes first, the model second. An LLM is applied only where it adds genuine value, never where plain executable code solves the problem more cheaply and reliably. Most products reach for the model first. I reach for the system.

Full-stack system thinking

Not full-stack code. Full-stack thinking: who interacts with the system, how it solves their problem optimally and cost-effectively, all the way down to the infrastructure it runs on. Few hold that whole span without a large team.

One person, four disciplines

Four disciplines that normally need four people. One head, deep in each.

A complete system normally asks for a strategist, a designer, a product lead, and an engineer, and it loses time and intent in every gap between them. I am all four, and the unusual part is not the breadth. It is the depth held in each at the same time.

Each one backed, not claimed. The matrix is the proof: one head that holds all four at depth, with no translation loss between them.

Product

Thirteen brands and eighty-plus products; a multi-tenant platform for twenty thousand-plus users.

Tech

Multi-tenant SaaS, production AI, multi-agent orchestration, RAG. Architecture is product strategy.

Strategy

P&L, go-to-market, pricing; grew an account three hundred and fifty per cent, ran a five hundred per cent pivot.

Design

Visual craft since twelve, formally trained. Have a design language already? I follow it to the letter.

Two ways in

Systems on the shelf. Or one built for you.

Both from the same hand and the same doctrine. One is already made and running; the other is made to measure, for something that does not exist yet.

Door one

Systems

A growing body of systems, already built and running. A flagship in production today, and an ecosystem of tools in early access. Different problems, different technologies, one hand.

See the systems →
Door two

Commission

A limited number of bespoke systems, built from the same hand and the same doctrine, for those who want something that does not exist yet. Tell me what you want to build.

Commission a system →
The flagship

A system that solves the problems around Pillar Two.

Pillar Two compliance is a hard, high-stakes problem: a calculation that has to be deterministic, traceable to the OECD rules, and defensible to an auditor. The flagship system takes that whole burden off the table. Live today, behind a request for access. The clearest proof of the doctrine in production, and one of a growing family.

Alongside it, an ecosystem of AI tools in early access, each built on the technology its job actually needs.

pillartwo.hallengrens.com
Jurisdiction · IETop-up due
Effective rate13.9% vs 15% floor
Elasticity · top-up tax
€1.2M€3.8M
conservative → recommended → aggressive
7elasticity points
23rulings cited
Medrisk profile
// deterministic layer 1 · traced to GloBE Art. 5.1
// 42 entities reconciled · 0 exceptions · audit trail exported
The hand behind it

One person stands behind all of it.

One unusual individual who has worked at the highest level, across product, tech, strategy, and design, for some of the world's biggest brands. The systems on this site are built by that one person, end to end. This is not a recent turn toward AI; it is a thread pulled for a long time.

1996

First code

2015

First machine-learning code

today

The AI frontier