ahmadhamza19

Location: Pune, India

Remote: Yes (fully remote since 2019, worldwide)

Willing to relocate: Yes

Technologies: Ruby, Ruby on Rails, PostgreSQL, Redis, GraphQL, Hotwire/Turbo, Sidekiq, RSpec, Node.js, JavaScript, Docker, CI/CD

Résumé/CV: https://drive.google.com/file/d/1Pn4PYHqgbTRAOGqEKEtO7k06-X9...

GitHub: https://github.com/ahmad19

Portfolio: https://ahmad19.github.io/

LinkedIn: https://www.linkedin.com/in/ahmad-hamza-0b812052

Email: ahmadhamza19 at gmail

Senior Ruby on Rails developer with 10+ years of experience across healthcare, e-commerce, talent platforms, gaming, and media. Most recently at Toptal (Nov 2021 to Apr 2026): on the core team I worked on an internal engineering insights platform used by hundreds of engineers, then on client engagements I built a guest checkout and storefront system plus enterprise catalog restrictions (GraphQL, policy engine, caching) for a healthcare e-commerce platform, and refactored a Google Merchant Center product pipeline for a large marketplace. Earlier I built payments and compliance features for a regulated gaming platform handling deposits and withdrawals across 30+ gateways.

Open source contributions to Devise, CanCanCan, and Kamal. Current side project: JustInvoicIt, a Rails 8 + Hotwire invoicing app for freelancers.

Looking for senior backend or full-stack Rails roles, remote worldwide.

Ruby on rails developer looking for senior roles and immediately available to start.

Location: Pune, India (UTC+5:30)

Remote: Yes — remote only

Willing to relocate: Yes

Technologies: Ruby on Rails, GraphQL, PostgreSQL, Redis, Hotwire/Turbo, RSpec, Sidekiq, Docker, CI/CD, MCP

Résumé/CV: https://drive.google.com/drive/folders/1WphuwQcEnJ89AUoyO3ve...

Email: [email protected]

Senior Ruby on Rails developer with 12+ years building scalable applications across healthcare, e-commerce, talent/recruitment, gaming, and media. Recent highlights: redesigned a legacy GMC reporting pipeline cutting CPU usage by 70%+ and runtime from days to hours; built a convention-driven engineering insights platform serving 600+ engineers at Toptal; end-to-end unauthenticated storefront with GraphQL policy engine at Fullscript. OSS contributions to Devise, CanCanCan, and Kamal. Available immediately.

Location: Pune, India (IST / UTC+5:30)

Remote: Yes — worldwide remote only

Willing to relocate: No

Technologies: Ruby, Rails, PostgreSQL, Redis, Sidekiq, GraphQL, Hotwire/Turbo, RSpec, Docker, Kamal

Résumé/CV: https://www.linkedin.com/in/ahmad-hamza-0b812052

Email: [email protected]

Senior Ruby on Rails developer, 10+ years. Most recent work via Toptal:

- Fullscript: built an unauthenticated storefront (catalog, guest checkout, org branding) and an enterprise catalog-restrictions policy engine — GraphQL mutations, caching, search integration.

- Desertcart: refactored a legacy Google Merchant Center disapproval system spanning ~300 accounts (150K–15M products each). Cut CPU 70%+ and reduced runtime from days to hours; added New Relic dashboards + Slack alerting to prevent account suspensions.

- Toptal Core Team (3 years): scalable architecture for an internal engineering-insights platform serving 600+ engineers across GitHub/Jira; convention-driven design + a custom Rails generator so new metrics ship fast. Also rebuilt parts of screening ops on a high-volume platform.

- Earlier: online casino platform (30+ payment gateways, anti-addiction compliance for 1M+ players) and team lead at Cybage.

OSS: small contributions to Devise, CanCanCan, and Kamal.

Side project: JustInvoicIt (Rails 8 + Hotwire) for freelancer invoicing. Currently experimenting with an MCP server using OAuth.

Looking for: Senior/Staff Backend or Full-Stack Rails roles. Comfortable owning architecture, mentoring, and shipping end-to-end.

Hi, can you also check for me ? I have applied on 1st november.

Location: Pune, India Remote: Yes (from anywhere) Willing to relocate: No Technologies: Ruby, Rails, Javascript, Stimulus, Turbo Resume: https://docs.google.com/document/d/1TQiSB4F37H6FpZibeSnBC5z3...

About Me: I have 10 years of professional experience with Ruby on Rails. A friend introduced me to ruby in my final year of college. Its simplicity drew me in - it was refreshing to see that something as basic as adding numbers was as straightforward as 1 + 1, a stark contrast to my experience with C. Since then, I've loved building products in Ruby and Rails.

In my early career, one of the first major challenges I faced was n + 1 queries. This issue was causing application crashes and out of memory errors. Following articles/stackoverflow/rails guides lead me to use "includes" but I quickly realized that sometimes Rails’ magic isn’t enough - sometimes you actually need to jump, get your hands dirty and dig deeper. This meant writing raw SQL queries which was learning in itself, and sometimes it means that problems initially looks complex but actually they are as easy as like removing the redundant http requests.

Navigating through those challenges taught me a lot about the importance of optimizing for scalability and maintainability.

More recently, at Toptal, while working on an analytical tool, I designed a module in the application's code structure with a focus on modularity and ease of extension. This approach ended up being so helpful that we decided to create a Rails generator to speed things up even more. The generator creates the necessary files with boilerplate code, so all that’s left is to adjust them to fit the specific requirements. It saved us a lot of time on repetitive setup tasks and made development much smoother. Read more here - https://medium.com/@ahmadhamza/scalability-through-conventio...

This journey—from discovering Ruby’s simplicity to now writing scalable applications—has been incredibly fulfilling, and I’m always looking to push those boundaries further.

Same here. Applied many times but never heard back from them.

this is perfect!

Well said. Making accept payments easy and seamless is the most important aspect.

Regards

Really amazing photos.

you mean heisenberg ;) ?

Need tips on how to choose an idea which can be coded in 48 hours with 4 people in the team ?

Location: Pune, Maharashtra, India, Remote: Yes, Willing to Relocate: USA Technologies: Ruby, Rails, Git, Javascript, jQuery, CSS, HTML Resume: https://www.linkedin.com/profile/view?id=185421452&trk=nav_r... Email: [email protected]