Markus Siering
Now

What I'm doing at the moment

Last updated August 2026.

Family

Like so many others, I'm a very, very proud dad. It's so much fun watching a child grow up, exploring the world and finding wonders in the tiniest things we grownups take for granted. These days I also sit on the parent council at her school, which turns out to involve more spreadsheets than I expected — so I'm building a small app for it.

Work

I'm a Senior Frontend Engineer at Whiskey Tango Foxtrot in Hamburg, working on regulated platforms with a lot of traffic: lotteries and insurance. The technical problems are good ones — Next.js and React Server Components at a scale where the architecture decisions actually bite.

Before this I spent three years at zolar putting my work behind the energy transition, until the company sadly went into insolvency. I've been thinking about how to get back to work that points the same way — software for the energy transition or the fight against climate change.

Training

HYROX has taken over the calendar. Before the next one there's a Spartan Race in Berlin at the end of August — purely for fun, no ambitions.

Hamburg · debut1:40:56October 2025
Berlin1:31:18May 2026 — ten minutes faster
NextHamburg DoubleOctober
The weekly shape
  • One strength day
  • Two or three easy Zone 2 sessions — rower, bike or SkiErg
  • One threshold run
  • One HYROX-style session: sleds, lunges, wall balls
  • A long slow run around the Alster on Sundays
Numbers, not dates
  • Bodyweight back squat and bench
  • Double bodyweight deadlift
  • 15 pull-ups
  • Simple & Sinister with the 32kg bell
Those are years away, which is the point.

Building

Small tools, mostly for myself:

HYROX session randomizer

Preact and Vite

Elite 15 bump chart

HYROX placements across the 2026 World Championships

Parent council planner

knauerplanner.de — the spreadsheets, finally civilised

Kickbase analyzer

Bundesliga fantasy football deserves better than my gut

HYROX tracker

still unfinished, as these things go

Reading and thinking about

Marine permaculture

Kelp farming as carbon drawdown and habitat. I read Bren Smith's Eat Like a Fish and have been following the Climate Foundation's work since. I keep turning over whether it works as a business with enough starting capital, or whether it's better off as a habitat project with no profit motive at all. Meanwhile I support Mossy Earth and watch their kelp and seagrass projects.