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Elena Marsh

Selected work

Software that holds up in production

A selection of recent builds across web apps, APIs and infrastructure. Each one shipped to real users, with the numbers to show for it.

Projects

Showing 6 projects

A smartphone on a white desk showing a payment card screen in a finance app

Ledgerline

Web app2025

A rebuild of a finance dashboard and mobile app used by 3,000 businesses, moving from nightly reports to live balances.

  • TypeScript
  • Next.js
  • PostgreSQL
  • Redis
  • WebSockets
Two server racks with glass doors and small status lights in a bright white data centre

Northwind

API & backend2024

A move from a struggling monolith to well tested services for a payments provider processing two million transactions a day.

  • Node.js
  • TypeScript
  • PostgreSQL
  • Kafka
  • Kubernetes
Hands holding a smartphone with a navigation route on a map against a pale blue background

Atlas Freight

Full stack2025

A full stack planning tool that turns thousands of daily deliveries into optimised routes for dispatchers and drivers.

  • React
  • TypeScript
  • Python
  • PostGIS
  • AWS
A doctor in a white coat talking with a patient in a bright consultation room

Kin Health

Web app2024

Booking, video consultations and payments for a network of 300 clinicians, rebuilt to be fast, accessible and secure.

  • Next.js
  • TypeScript
  • Node.js
  • PostgreSQL
  • Stripe
A hand holding a smartphone above a pale green desk with coffee, a glass of water and sticky notes

Fieldnote

Mobile2023

A sync engine and mobile app for a research notes product used in places where a good connection is a luxury.

  • React Native
  • TypeScript
  • SQLite
  • CRDTs
  • Node.js
A developer typing at a desk in front of a monitor showing code in a dark editor

Pipewise

Open source2023

A command line tool that turns sprawling CI configuration into clear, testable pipelines, now used by thousands of teams.

  • Go
  • GitHub Actions
  • Docker
  • YAML