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Fiverr Pro
English
$
USD
I will debug, optimize, and refactor your code
Hamza Zahid
About this gig
If your application has bugs, performance issues, or messy code, I can help.
I provide professional debugging, refactoring, and optimization to make your system stable and scalable.
I offer professional development with a focus on clean architecture, performance, and scalability. My work follows industry standards and best practices, ensuring your application remains maintainable and future-proof.
Technical services include:
- Ruby on Rails development (Service Objects, POROs, ActiveRecord, Mailers, Sidekiq)
- RESTful API development with proper versioning, serialization, and testing
- Authentication and authorization using Devise, JWT, Pundit, or CanCanCan
- Database design, complex queries, indexing, and optimization for PostgreSQL/MySQL
- Frontend integration using Hotwire (Turbo/Stimulus) or React
- CI/CD pipelines using GitHub Actions, Docker-based deployments, and environment setup
- Caching strategies (Redis, fragment caching), background processing, and performance tuning
- Rails version upgrades, dependency auditing, and refactoring legacy code
Every feature is delivered with modular structure, documented commits, and optimized performance. Ideal for startups, SaaS products
Get to know Hamza Zahid
Hamza Zahid
Expert Full Stack Developer
- FromPakistan
- Member sinceNov 2025
- Avg. response time1 hour
Languages
English
Why Clients Hire Me
- Experience building HIPAA-compliant products, including secure data handling, access controls, audit logging, and encryption best practices
- Full-stack + AI expertise
- Security- and compliance-aware development
- Clean, production-ready code
- Reliable communication and on-time delivery
Backend & APIs
- Node.js (MERN), NEST/EXPRESS, Django, Ruby on Rails, PHP
- REST & GraphQL APIs
- Authentication: JWT, OAuth2, Devise, Firebase Auth
- Background jobs & queues (Redis, Sidekiq, Celery)
Frontend
- React.js, Vue.js, Next.js
- Modern, responsive UI with TailwindCSS
My Portfolio
FAQ
What do you need to get started?
A clear description of your requirements and access to your code repository (GitHub/GitLab). If it's a new project, I’ll help define the structure and requirements.
Can you work on an existing Ruby on Rails project?
Yes, I can work on existing, new, or legacy Rails applications. I can fix bugs, add features, refactor code, or upgrade versions.
Do you provide API integration or custom backend solutions?
Absolutely. I handle third-party API integrations, custom API development, webhooks, background jobs, and data pipelines.
Can you also handle the frontend part?
Yes. I can work with ERB/HAML, Hotwire/Turbo, Stimulus, TailwindCSS, or React if full-stack support is required.
Do you offer deployment services?
Yes. I can deploy your application to Heroku, Render, AWS, DigitalOcean, or Dockerize it based on your environment.
