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Muhammad Ur Rehman

@muhammadurrehman

Message

Senior Ruby on Rails engineer scaling SaaS systems with reliable APIs.

Pakistan

Message

What I'm looking for

I’m looking to build and scale Ruby on Rails SaaS with reliable REST/GraphQL APIs, strong production ownership on AWS/Heroku, and high-quality testing. I enjoy mentoring teams and shipping features that perform in the real world.

I’m a Senior Ruby on Rails Engineer who designs and scales production Ruby on Rails applications for real-world B2C SaaS. I build reliable REST and GraphQL APIs, manage system health in production, and ship end-to-end solutions with Node.js and React—focused on reliability, speed, and maintainability.

In my recent role, I owned deployments across Heroku and AWS and strengthened performance by optimizing workflows, cutting patient onboarding time from 12 seconds to ~1 second, and reducing Rails background job execution from ~30 seconds to under 4 seconds. I’ve also led architectural decisions and mentored engineers, improved testing coverage to 70%+, and enhanced developer experience with clear Swagger docs and modern real-time updates using Turbo/Hotwire.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

WeGuide

Aug 2023 - Present (2 years 11 months)

Owned production deployments and system health across Heroku and AWS, including S3, Cloudflare, and API Gateways. Built and optimized Rails background job processing, REST/GraphQL APIs, automated tests, and real-time admin updates using Turbo.

Ruby on Rails Heroku AWS S3 Cloudflare API Gateway REST APIs GraphQL APIs Swagger RSpec Cucumber Capybara Cypress Background Jobs Vacuumdb Turbo Hotwire GitHub CircleCi Jira Real Time Updates Cursor Claude ChatGpt

Senior Software Engineer

Crewmate Inc.

Aug 2022 - Aug 2023 (1 year)

Improved backend performance by optimizing Ruby on Rails architecture and refactoring Node.js microservices. Delivered new features, containerized Rails with Docker, implemented Turbo/Hotwire, and led CI/CD and monitoring improvements.

Ruby on Rails Microservices Performance Optimization Docker AWS Heroku Turbo Hotwire CI CD Pipelines Monitoring New Relic

Senior Backend Engineer

Dentolo

Jul 2022 - Mar 2023 (8 months)

Built Rails REST API endpoints and Node.js microservices for a healthcare platform, including Rails-based GraphQL APIs. Improved CI/CD with Jenkins and Kubernetes, enhanced background job processing, and developed a Rails/React admin panel supported by automated testing.

Ruby on Rails REST APIs Microservices GraphQL APIs CI CD Jenkins Kubernetes Automation Testing Ruby on Rails Admin Panel React

Software Engineer

Devsinc

Feb 2021 - Jul 2022 (1 year 5 months)

Developed and enhanced e-commerce and re-commerce web applications for large-scale user traffic. Built Rails-based CRM functionality, Shopify-integrated Rails apps, Node.js microservices improvements, and real-time messaging using Action Cable, supported by automated CI/CD and testing.

Ruby on Rails CRM Microservices GitHub Actions Jenkins CI Runs Python Automation RSpec Cypress Capybara

Associate Software Engineer

Ember.pk

Jan 2019 - Feb 2021 (2 years 1 month)

Developed Ruby on Rails APIs for multiple mobile and web applications and built Flutter mobile apps for Android and iOS. Implemented React/JavaScript admin panels, set up CI/CD with GitHub Actions and CircleCI, published to app stores, and improved reliability with extensive RSpec and Cucumber test coverage.