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I will debug, optimize, and refactor your code
Hamza Zahid
Acerca de este Servicio
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
Conoce a Hamza Zahid
Hamza Zahid
Expert Full Stack Developer
- DePakistán
- Miembro desdenov 2025
Idiomas
Inglés
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
Mi porfolio
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.
