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Fractional Ruby on Rails developer for fast moving teams.

I'm Wagner Matos, a UK based software engineer helping startups, agencies, and SaaS companies build and maintain reliable Rails applications. Available for ongoing retainer or fractional engagements across the UK, US, and Europe.

You don’t always need to hire another engineer permanently. I can join your team part-time or on retainer to ship features, refactor legacy code, or keep your app stable and moving forward.

I integrate quickly, communicate clearly, and respect your team’s process. My goal is to make your life easier, whether that’s reviewing PRs, leading a small rebuild, or helping you plan technical decisions.

How I can help

  • Fractional Rails Development - Ongoing part-time engineering support for your product.
  • Technical Consulting - Architecture reviews, code audits, and mentoring.
  • Feature Development - Design and build new functionality with clean, maintainable code.
  • AI & Machine Learning Integration Add intelligent features to your apps: recommendation systems, natural language processing and AI-driven automation.
  • Maintenance & Support - Keep your app secure, up-to-date, and performant.
Get in touch

Active Job Continuations in Rails 8.1: What They Actually Solve

Rails 8.1 shipped on 22 October 2025, and Rails 8.1.3, released on 24 March 2026, is the current stable release as of writing (April 2026). After a few months of using Active Job Continuations on a couple of client projects, I want to write down w...

The Complete Guide to Rails Credentials and Secrets Management

Managing secrets well is a common hallmark of production grade Rails applications. Get it wrong and you're one misplaced commit away from exposing API keys, database passwords, or encryption tokens. Get it right and your team can deploy confidentl...

Ruby 4.0 is Here - What It Actually Means for Your Rails App

Ruby 4.0 landed in December 2025. Rails 8.1.3 followed in March 2026. If you're running a production Rails application and haven't looked closely at either release yet, this post is for you. Not a feature dump — a practical take on what matters, w...

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Recent Work

Johnson & Johnson During the ECP Congress 2025, Johnson & Johnson needed a way to bring their precision medicine story to life on the exhibition floor. Healthcare professionals would be passing through quickly, the experience had to attract, educate, and track engagement, all without depending on venue Wi-Fi or cloud infrastructure.
Alertive I built a serverless webhook service that delivers real-time conversation events to each trust's own systems, handling encryption, authentication, concurrent delivery, and automatic retries.
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Johnson & Johnson During the European Academy of Dermatology and Venereology (EADV) 2025 Conference, Johnson & Johnson Medical aimed to better understand how healthcare professionals interacted with their multi-zone exhibition booth, so they’ve asked me to come with a solution that would provide real-time visibility while operating independently of Wi-Fi or cloud connectivity
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Johnson & Johnson During the European Academy of Dermatology and Venereology (EADV) 2025 Conference, Johnson & Johnson Medical aimed to better understand how healthcare professionals interacted with their multi-zone exhibition booth. Traditional tracking methods lacked real-time visibility and were often dependent on unreliable event Wi-Fi and cloud connectivity.