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Timothy Lewis

@timothylewis1

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Senior Ruby backend developer building Shopify apps, including Stakeout, a product price-comparison app.

Germany

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I’m currently developing Shopify apps and other freelance projects, including Stakeout, a price-comparison app that fetches prices for the same or similar products from online sources. I built it with Rails 8 and Shopify integrations.

At Vaha / etone Motion Analysis GmbH, I helped build the Vaha Fitness Mirror from scratch, including its backend API and subscription and billing system. I designed and built the central billing system for recurring revenue, and led a five-developer backend team in my final year there.

At Pixformance Sports, I designed and built major parts of the REST API for Smart Trainers and led a Rails 4-to-5 upgrade of a large production codebase with no downtime. Earlier, I contributed to its Rails backend and built Puppet-managed infrastructure.

Experience

Work history, roles, and key accomplishments

Current

Senior Ruby Backend Developer

Current

Freelance

Apr 2024 - Present (2 years 5 months)

Self-employed, focused on Shopify app development and other freelance projects, including a price comparison app and an AI-powered website generation system.

Ruby on Rails Hotwire Turbo Stimulus Polaris ViewComponents esbuild PostgreSQL Solid Queue Shopify Apps JWT Shopify App Bridge SerpAPI Cloudflare Workers Flue SQLite Acidic Job Ruby LLM Tailwind

Senior Ruby Backend Developer

Vaha / etone Motion Analysis GmbH

Jul 2019 - Apr 2024 (4 years 9 months)

Led the backend team and designed the billing and subscription system for the Vaha Fitness Mirror, handling recurring revenue for ~1,000 subscribers. Built a unified messaging stack for customer communication.

Ruby on Rails Grape Redis Sidekiq PostgreSQL Heroku Shopify ChargeBee Stripe Sendgrid OneSignal Twilio

Ruby Backend Developer

Pixformance Sports

Jul 2017 - Jul 2019 (2 years)

Led a Rails 4 to 5 upgrade of a large production codebase with no downtime. Designed and built major parts of the REST API serving Smart Trainers and frontend clients.

Ruby on Rails Redis Sidekiq PostgreSQL Heroku

Windows/Linux Server Administration / Devops-Backend-Infrastructure

Pixformance Sports

Feb 2014 - Jul 2017 (3 years 5 months)

Joined as a network administrator with a growing focus on backend development. Contributed to the Ruby on Rails backend for device communication and built a decentralized, fault-tolerant Puppet-managed infrastructure.

Ruby Ruby on Rails Puppet Active Directory Heroku