hs.

Hobby

3D Printing

One of my favourite side passions. I design and print custom pieces on a request basis — from functional parts to decorative objects. Each piece starts with a brief and ends with something physical in the world.

# Examples

Custom prize statue

A friend needed a cable organiser that could clip onto the back of a standing desk with an irregular edge profile.

Built with Ruby on Rails & Tailwind CSS — Helder Santos © 2026
Full Experience

xgeeks

6 years

Tech Lead

Mar 2021 → Present

CIRCL

React, Node.js, TypeScript, Jest, GitHub Actions

Led the frontend team to build a route planning software, initially catering to the needs of a specific LPG distributor in Portugal and later planning and executing a solution to launch on the global market, with special focus on the US and Europe. Led product discussions and informed decisions based on expected outcomes.

  • –Integrated authentication between App and Web using Auth0
  • –Route job/stop configuration on the frontend, including all possible constraints
  • –Route assignment to drivers and vehicles with active monitoring on the web
  • –Integration with Flatfile for spreadsheet import of existing routes
  • –Integration with backend providing routing capabilities from a 3rd party provider
#route-planning #system-architecture

Cazoo

Next.js, React, Node.js, Ruby on Rails, TypeScript, Jest, CircleCI, GitHub Actions

Supported xgeeks engineers working on the client and ensured smooth operations.

  • –Led internationalisation of customer-facing applications for European expansion, including CI/CD-integrated translation workflows
  • –Maintained and executed a decommissioning plan for the car subscription proposition to maximise cost savings without compromising base operability
  • –Supported the Vehicle Lifecycle team in maintaining and optimising logistics systems after its main contributors left
  • –Shifted focus to marketplace pivot — created a vehicle intake journey from the ground up and optimised it using collected user interaction metrics
#i18n #design-system #subscriptions #marketplace

Team Lead

Aug 2023

Vocable.ai

React, Ruby on Rails, GPT

Led the team in a launch-critical phase to ensure timely delivery within previously agreed deadlines. Facilitated alignment between internal and external engineering teams and the client.

#AI #GPT

Software & Architecture Auditor

Feb 2021

Bertha

Ruby on Rails

Analysed multiple Ruby on Rails applications in terms of performance and code quality to ensure future scalability. Identified performance bottlenecks in the system architecture and proposed measures to ensure stability under high usage peaks.

#ruby-on-rails

Team Lead

Dec 2020

Packery

React, Ruby on Rails, GPT

Led the team in a launch-critical phase to ensure timely delivery within previously agreed deadlines. Facilitated alignment between engineering teams and the client.

#AI #react #ruby-on-rails

Senior Software Engineer

Dec 2020

Packery

Nuxt.js, Vue.js, Docker

Onboarded an ongoing project to clear existing blockers and enable delivery of the final product. Led development of new features on a Vue.js application with a Golang backend. Improved the existing 3D rendering engine and added PDF export capabilities.

#3d-rendering

ProjectBox

9 years

Software Engineer / Tech Lead

Oct 2011

Ruby on Rails, MySQL, SQL Server, PHP, jQuery, WPF, ASP.NET, .NET Core, React, WSL

Worked as a full stack developer across multiple languages and frameworks. Interfaced directly with clients, managed projects and tech teams to ensure profitability and client satisfaction. Led the development of an international project for testing critical applications in the healthcare sector for the UK market.

#software-engineer #tech-lead #project-management

Education

BSc in Computer Science

Polytechnic Institute of Viseu