Say hello

Elias · Software engineer · London

How I work

I like getting under the skin of a product: how it works, what the data says, and how it feels to use.

Elias standing aboard a boat, with water and a rocky coastline behind him
Out on the water

Here Things I’ve built, things I’m trying, and a few things I enjoy.

Selected work

01 / Featured work

A few things I’ve been building.

Threshold landing page showing rental affordability choices for London, Basel, and Zurich01

Product engineering · Data visualisation · 2026

Threshold

A rental calculator for London, Basel, and Zurich. It puts salary, moving costs, and local assumptions together so you can see what a move might take.

  • Shareable URL state
  • Typed city configuration
  • Accessible visual reasoning
Built with
React 19 · TypeScript · Vite · React Router · React Map GL · MapLibre GL JS · URLSearchParams · Vitest
Read case study Open project View code
Argus Risk interface showing event-driven risk positions02

Event-driven systems

Argus Risk

A local simulator for a multi-currency risk platform. Follow simulated prices and trades through the system and see what they do to a portfolio.

Built with
.NET 8 · Kafka / Redpanda · PostgreSQL / Marten · SignalR · Next.js
Read case study View code
Flowtime focus timer interface03

Offline-first interaction

Flowtime

A focus timer that keeps time when your browser dozes off. It saves your history on your device and lets you choose what happens if you close the tab mid-session.

Built with
Next.js · TypeScript · localStorage · Service Worker · Vitest
Read case study Open project View code
View all work

02 / Outside work

Some of what I’m into lately.

Recent building

Live · past yearI’ve made 1025 contributions in the past year.
0private
27 Sept 2025 – 26 Sept 2026Past 365 days
Sun
Mon
Tue
Wed
Thu
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Sat

Scroll across the year. Focus a day and use the arrow keys to explore it.

· No contributions
LessMore
GitHubUpdated 26 Sept

Around here

London skyline from the Thames, with St Paul’s Cathedral and the City beyond
London · home base

Training

Typical weekMy weekly training plan
MonFull body
TueZone 2 run
WedFull body
ThuInterval run
FriFull body
SatZone 2 rowing machine
SunInterval assault bike
My weekly plan

Fantasy football

Live
Weekly matchupWeek 3
My team21.0points
Opponent3.8points
0–2 this season
SleeperUpdated 26 Sept

Books, films, music and history

A few things I enjoy outside work.

GoodreadsCurrently readingDark Age001

Dark Age

The #1 New York Times bestselling author of Morning Star returns to the Red Rising universe with the thrilling sequel to Iron Gold. For a decade Darrow led a revolution against the corrupt color-coded Society. Now,…Updated 26 SeptView on Goodreads
LetterboxdMost recently watchedThe Invite002

The Invite

2026 · 4.0 out of 5Updated 26 SeptView on Letterboxd

Music · Spotify

My playlist

What I’m listening to

I add songs as I find them.Open playlist in Spotify

History

A few curious turns

Saved examples
  1. On this day1783

    The first living creatures to ride in a balloon were a sheep, a duck and a rooster. All three survived the flight at Versailles.

    Read the record
  2. On this day1933

    Mexico’s Empresa Mexicana de Lucha Libre, now CMLL, was founded by Salvador Lutteroth.

    Read the record
  3. On this day2003

    NASA sent Galileo into Jupiter’s atmosphere, ending its 14-year mission and protecting Europa from a future impact.

    Read the record
Browse Wikipedia history

03 / Experiments

Things I’m trying out.

Side projects, interface studies, and notes from things I’m making.

01Warm illustrated portrait of the eccentric Professor Past

History experiment

Ask Professor Past

Ask an eccentric professor about history; this is the first public version of Professor Past.View source
02Aerial view of a football stadium and marked fieldFootball · Data · Prediction

Fantasy football models

I’m tinkering with matchup views, rankings, and draft tools for my Sleeper league. A prediction model might be next.Read experiment note

The live matchup is on the homepage; this is where I try the ideas around it.

03Flowtime focus timer interface showing an idle sessionInteraction · Craft · Notes

Interface studies

Small studies of controls, motion, and the details that make a product easier to use.Read experiment note

I keep the studies that teach me something, even when the idea doesn’t work.

04 / About

A bit about me.

I’m in London, building high-performance pricing and risk systems. Away from work, I make my own products end to end: I start with the problem, shape the experience, write the code, and stay with the hard bits until they make sense.

I like software that tells you what it’s doing, holds up when things go wrong, and gets the small details right.

Start a conversation
Elias Bennett smiling in a white dinner jacket
Off duty, approximately

Career path

My career so far.

I like getting under the surface of a product. I started by using data to improve websites, then moved into building software.
  1. 01

    Marketing Executive

    Optegra Eye Healthcare & Kensington Medical

    I worked with engineers on website performance, using Core Web Vitals and split tests to help choose what to fix.

  2. 02

    Full Stack Software Engineer

    Joveen

    I moved into the code, improving an ecommerce site across React, MySQL and a Java/Spring Boot backend.

  3. 03

    Present

    Software Engineer

    BNP Paribas CIB

    High-Performance Computing, Pricing and Risk Systems · through _nology

    These days I work on software that brings market data into pricing and risk calculations.

05 / Contact

Let’s talk.

Email me eliasthebennett@gmail.com
Elias smiling outside in a grey jumper