elliot.hegraeus
en sv

About

Backend systems, with the maths underneath.

Engineer and student in engineering mathematics at KTH. I build the parts of a product users never see but always feel — schedulers, sync engines, billing, data models — and I have the quantitative background to know when the maths matters.

I learned the stack the hard way — then made it move faster.

The maths came first — I'm reading Civilingenjör i teknisk matematik at KTH — applied computational mathematics, weighted toward data science and financial mathematics. It's the background that lets me treat Monte Carlo, regression and optimisation as engineering tools rather than coursework.

Then the systems — At Fairlo I built a FastAPI service on AWS and Snowflake that automated call-centre outreach, plus regression-based reporting across every schema. At Abeloo I modernised the platform and wrote an automation tool that took an internal research report from an hour to a minute.

Now the products — Three early-stage ventures with live users — a scheduling engine in Rust, a delivery backend, a tested micro-betting core. I take them end-to-end: data model, billing, and the interface people actually touch. When the brief is reach rather than throughput I build for that instead: the Habitat 10 site I wrote holds the top organic result and is the source Google's AI Overview cites.

Go / Rust / Python / TypeScript / FastAPI / PostgreSQL / Redis / Docker / Backend systems / Automation / Monte Carlo / Regression & optimisation / Machine learning / Agentic workflows

Where I've shipped

  1. Incoming — consulting engagement · International hospitality group

    2027

    Brought in through referral to advise a major international hospitality brand; scoping with leadership in 2026.

    Read more
  2. Software engineer & tech consultant · Abeloo SA

    2025 – 2026

    Built and still maintain their platform on a part-time contract; built an automation tool that cut a research workflow from an hour to a minute.

    Read more
  3. Developer intern · Fairlo

    2024

    FastAPI / AWS / Snowflake — automated call-center outreach and built regression-based reporting across schemas.

    Read more
  4. Product engineering · Habitat 10

    2025

    Built the Habitat 10 site on Next.js / React — now the top organic result and the cited source in Google's AI Overview for the development.

    Read more

How I work

  • Small, well-named pieces that are easy to reason about and easy to change.
  • Boring, reliable concurrency over clever abstractions.
  • Measure before optimising — then optimise the thing that's actually slow.
  • AI as a multiplier on judgment I already had, never as a substitute for it.

What I reach for

The tools that earn their place in my work — each one with a note on where and why I use it.

See how I use each one

At a glance

Focus
Backend systems, automation & quantitative engineering
Stack
Go, Rust, Python, TypeScript, Postgres
Based in
Stockholm · London
Currently
KTH engineering mathematics · open to the right role
Languages
English (native) · Swedish (C2, Tisus)
Writing
100-page report on AI in schools for the Swedish Board of Education

Open to backend, quant-adjacent and founding-engineer work.