Skip to content

About

Engineer, problem solver and lifelong student of how systems work.

I help teams turn ambitious ideas into software that is fast, dependable and a pleasure to maintain, from the first schema to the last pixel.

Elena Marsh smiling with her arms crossed against a light studio wall
Years building production software
9+
Products and platforms shipped
40+
Average uptime across the systems I run
99.9%
An engineer typing at a desk with a large monitor showing code in an editor

A little more about me

I wrote my first program on an old family laptop in Porto: a text adventure that crashed every time you opened the fridge. I've been chasing that feeling of making something work ever since. After a computer science degree, I joined a small agency and learned to ship quickly for clients in health, finance and retail.

Later, as a senior engineer at a fintech in London, I helped scale a payments platform from thousands to millions of transactions a day. It taught me to care as much about observability, testing and a calm on-call rotation as about clean code.

Today I work independently from Lisbon and take on a few projects at a time. I'm happiest owning a product end to end: modelling the data, designing the API, building the interface and making sure it all stays fast and reliable long after launch.

Experience

  1. 2022 – Present

    Independent full stack engineer

    FreelanceLisbon

    Building web products, APIs and infrastructure for startups and established teams across Europe and North America.

  2. 2019 – 2022

    Senior software engineer

    Brightwell BankLondon

    Scaled the payments platform from thousands to millions of daily transactions and led the move to an event-driven architecture.

  3. 2016 – 2019

    Software engineer

    Coastline DigitalLondon

    Built web apps and APIs for clients in health, finance and retail at a 40-person product agency.

  4. 2015 – 2016

    Junior developer

    Studio FerroPorto

    Started my career building websites and internal tools, and fell in love with shipping things people actually use.

Toolkit

What I do

  • Web applications
  • APIs & backend
  • Cloud & DevOps
  • Technical consulting

Tools I use every day

  • VS Code
  • Git and GitHub
  • Docker
  • GitHub Actions
  • Postman
  • Sentry
  • Linear
  • Figma

Elena rebuilt our dashboard without a single day of downtime. She explained every trade-off in plain language, and the result is now the fastest part of our product.

Sofia AlmeidaCTO, Ledgerline