Hello, my name is
Wagner Matos
I am Product Engineer
Based in Dorset, UK. I have rich experience building scalable, well designed products. I’d love to talk about your project.
- 15 + Years of Experience
- 100s Completed Projects
Hacker
What I Do
my Services
Services
Technologies, Languages
and Frameworks
Ruby
90 %
Ruby on Rails
95 %
JavaScript
80 %
Golang
65 %
React
60 %
Node JS
80 %
Skills
Portfolio
my Cases
Development
View Project
Coverage Impact
Application that converts raw csv data and generate analytical graphs
Portfolio
Resume
my CV
Experience
Citizens Advice - Contract
Senior Software Engineer
Oct 2023 - Apr 2024
As a Senior software engineer, I have helped increase the team’s velocity, streamlined processes and improve overall delivery. I am currently helping to deliver a critical project with a strict deadline.
Juniper Education - Contract
Senior Software Engineer
Aug 2022 - Mar 2023
As a software engineer my role is to work closely with the tech lead and deliver features and critical maintenance to a platform that allows customers to buy or sell their cars online. I helped implementing critical features as well as fixing bugs and ensure the system was kept up to date.
Citizens Advice - Contract
Senior Software Engineer
Sep 2021 - Mar 2022
As a senior software engineer my role is to work closely with product owner and other stakeholders to deliver features and critical maintenance to a platform that allows advisers provide help to thousands of people every day. I was also responsible for helping reviewing the system architecture and providing suggestions on where and how the application could be split into discreet services and APIs.
Experience
Babbel - Contract
Senior Software Engineer
Apr 2023 - Sep 2023
As a senior software engineer my role is to work closely within the Tech and Tools (TnT) team providing tool to enable and facilitate other engineering teams as well as looking after critical services (Authentication and Authorization) and infra-structure (AWS stack, Elastic Search, Kibana, etc) and deliver features and critical maintenance to a platform that allows users learn new languages.
Carwow - Contract
Senior Software Engineer
Apr 2022 - Sept 2022
As a software engineer my role is to work closely with the tech lead and deliver features and critical maintenance to a platform that allows customers to buy or sell their cars online. I helped implementing critical features as well as fixing bugs and ensure the system was kept up to date.
Harper Concierge - Perm
Lead Software Engineer
Apr 2019 - Sep 2021
As a lead software engineer my role was to design and create a platform that exchange information with several e-commerce platforms e.g. Shopify, SalesForce, Magento and other 3rd party vendors.
History
Latest Blog
my Articles and Advice
July 4, 2025
Constant Collision in Rails: When Your Concerns Clash with Gems
While working on a Rails app recently, I stumbled across a frustrating bug that only appeared in the test environment. Everything worked perfectly in the development console. Models loaded fine. Associations were intact. My concern methods behaved exactly as expected. But then my test suite started throwing mysterious NoMethodErrors—complaining that an ActiveRecord model was missing associations it clearly had.
July 3, 2025
AI Is a Productivity Multiplier — But Only If You Stay in Control
Alberto Fortin’s recent post on dialing back LLM usage resonated with me. Like many developers, I’ve found AI to be both a productivity godsend and a source of friction. It can feel like magic — until it quietly leads you down the wrong path.
…
July 3, 2025
Rails Testing Gotcha: When Concerns Work in Console But Not in Tests
If you’ve ever encountered a situation where your Rails model associations work perfectly in the console but mysteriously fail in your test suite, you’re not alone. I recently ran into this exact issue and wanted to share the solution along with some insights about Rails’ autoloading behavior.
…
Blog
Contact Me
Let’s Talk About Ideas
Address
Dorset, United Kingdom
Freelance
Available Right Now
Contact Me