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I will develop custom software or backend systems using spring boot
Leo
About this gig
Are you looking for a reliable, senior-level backend developer to build robust, scalable, and secure systems? You are in the right place!
I specialize in enterprise-grade software development, custom API architecture, and database optimization using Java Spring Boot, Node.js, and modern database technologies.
What I Can Do For You:
- Custom Backend Development: Java (Spring Boot, Spring MVC, Spring Security) & Node.js (Express, NestJS)
- API Architecture: Secure, RESTful API design & Microservices integration
- Database Engineering: MySQL, PostgreSQL, MongoDB schema design, indexing, and query optimization
- Security & Auth: JWT, OAuth2, role-based access control (RBAC), and encryption
- Cloud & DevOps: Docker containerization, Redis caching, and CI/CD setup
- Refactoring & Debugging: Legacy code cleanup, performance tuning, and bug fixes
Why Work With Me?
- Enterprise Architecture Standards (Clean Code, SOLID principles)
- Comprehensive API Documentation (Postman Collection / Swagger)
- High-Performance & Scalable Code
- Clear, Fast & Professional Communication
Please contact me before placing an order to discuss your project requirements and architecture!
Get to know Leo
Leo
Senior Full Stack Engineer: Java, Spring Boot, C Sharp, Vue, React, Mobile
- FromChina
- Member sinceJul 2026
- Avg. response time1 hour
Languages
English
Hi, I'm a Senior Software Engineer specializing in full-stack, backend, and mobile development.
Tech Stack:
Backend: Java (Spring Boot/Cloud), C# (.NET), Python
Frontend & Mobile: Vue, React, Android, iOS
Database & Infra: MySQL, PostgreSQL, REST APIs, Microservices, Docker
Services I Offer:
Custom RESTful API development & third-party integrations
Database schema design & query performance optimization
Full-stack web platforms & mobile app modules
Python scripts for automation & data processing
I deliver clean code, solid architecture, and clear docs. Message me to start!
Other Software Development Services I Offer
FAQ
Do you provide complete documentation for the APIs?
Yes, all packages include complete API documentation (Postman collection or Swagger UI) and setup instructions for smooth integration.
Can you help with custom cloud deployment?
Absolutely. I can containerize the app using Docker and provide deployment support for AWS, DigitalOcean, or Linux VPS environments.
What platforms do you support?
I support all major backend platforms and cloud providers, including Java (Spring Boot), Node.js (Express/NestJS), C# .NET, and database platforms like MySQL, PostgreSQL, and MongoDB. For deployment, I work seamlessly with AWS, Azure, Docker, and Linux/Windows server environments.
