Browse categories
Explore
Fiverr Pro
English
$
USD
I will build a high performance scalable backend system


Mario Balan
About this gig
Stop fighting with slow database queries, messy code, and APIs that crash.
I write efficient, reliable backend code that handles the heavy lifting behind the scenes without overcomplicating the setup. I am a backend developer focused on writing code that gets the job done.
Whether you need a robust Java (Spring Boot) server, a fast TypeScript (Node.js) backend, or a Python API, I build systems that are easy for your frontend team to plug into.
What I Can Build For You:
- Custom APIs: Secure RESTful endpoints tailored exactly to what your application needs to do.
- Database Setup: Structuring relational databases (PostgreSQL), flexible NoSQL (MongoDB), or integrating BaaS like Firebase/Supabase for faster delivery.
- Speed & Performance: Implementing Redis caching to prevent database bottlenecks and keep data access lightning-fast.
- Security: Keeping user data secure by setting up JWT or OAuth2 logins.
- Business Logic: Writing the core code that processes data and interacts with external services.
Please send me a message before ordering! Lets talk about what you need to build and figure out the best way to get it done! Thank You!
Get to know Mario Balan
Mario Balan
Full Stack Software Engineer and Backend Specialist
- FromRomania
- Member sinceJan 2026
- Avg. response time1 hour
Languages
Romanian, English
Full-stack engineer | Backend architecture & scalability. Scaled platforms to 25M+ users (CC).
I build distributed backends, REST/WebSocket APIs, real-time systems & AI/LLM integrations—clean, secure, and built to grow.
Java/Spring Boot · Node.js · Python/FastAPI · React/Next.js · PostgreSQL · Redis · OAuth/JWT
New product or existing system—message me and let's ship something that lasts.

