Rubén Beltrán del Río

✷ Holistic tech services ✷

Welcome.
A pixel-art portrait of Rubén doing a peace sign and sticking his tongue out

Howdy! I'm Rubén Beltrán del Río, a freelance software engineer based in Berlin. I build iOS and macOS apps, web applications, backend services, and help teams with technical leadership. Looking for some help with your project? I might be able to help!

I can help you build.

  • Fast, accessible websites with SEO optimization and cutting edge web development best practices.
  • Native iOS, iPadOS, and macOS apps using Swift, Catalyst, SwiftUI, or UIKit.
  • Scalable backend services with great observability, clear documentation, and cloude-native infrastructure.
  • End-to-end data pipelines from tracking planning, to ELT/ETL workflows that deliver accurate and actionable analytics insights.
  • Infrastructure as code that can orchestrate and manage all your services on AWS, Scaleway, Azure or any cloud provider.

Optimize and improve.

  • Supply chain analysis to reduce risk from dependencies across different languages and packaging ecosystems.
  • CI & CD automation to improve code quality, testing, and deployment.
  • Cloud cost optimization through right-sizing, architecture improvements, and spending analysis for AWS, GCP, Azure and other cloud providers.
  • LLM integration & optimization using custom tooling, prompt engineering, and Model Context Protocol (MCP) servers.

Or help your team go fast.

  • AI transformation. Teach your organization how to work with AI, and build the right tools to support it.
  • Upskill your team, and bring them up to speed with new technologies, architecture patterns or processes.
  • Build a product engineering mindset and ehelp your product and engineering teams speak the same language, and work closer together.
  • Experimentation mindset to enable your team to design, execute, and interpret A/B tests and multivariate experiments.
  • Systems analysis to streamline your operations by understanding how your team, resources and processes come together, finding chokepoints, and reducing waste.

Ain't that right!

With over 25 years of experience, I've worked with big and small teams, ad-supported and sales-driven products, bootstrapped startups looking to launch, and established companies looking to scale up. I've worked with all sorts of stacks:

  • Languages: JavaScript, Rust, Ruby, Python, PHP, Swift, Objective-C.
  • Cloud Providers: AWS, Scaleway, Cloudflare, Google Cloud, Azure.
  • CI Systems: GitHub, Gitlab, CircleCI, TravisCI, Jenkins, Bitrise.
  • Database Systems: PostgreSQL, MySQL/Aurora, Redis, MongoDB, Apache Cassandra, Snowflake.
  • Analytics Software: Google Analytics, Amplitude, PostHog, Indicative.
Get in touch.

You can book a call to tell me about your project face to face. Or you if you prefer text, you can send me an e-mail!

Book a call.

But don't take my word for it.

Here's what some lovely people have to say about me.