Hire a Backend Developer. APIs. Databases. Architecture. - Aleksandar Kuzmanovic offers many high-quality services. Need to hire a backend developer? I'm Aleksandar Kuzmanovic — a freelance back end developer with 12+ years of experience building server-side systems with Node.js, Django, Laravel, and Java. I architect APIs, design databases, and build the server-side logic that powers production web applications. Key stats: 12+ Years experience, 4 Backend frameworks, REST + GQL API expertise, 3 Database engines. Technologies: Node.js, Express.js, Django, Python, Laravel, PHP, Java, PostgreSQL, MongoDB, MySQL, GraphQL, REST APIs, Redis, Docker, AWS, Socket.io. Contact: aleksandarkuzmanovic02@gmail.com.
Hire a Backend Developer.
APIs. Databases. Architecture.
Need to hire a backend developer? I'm Aleksandar Kuzmanovic — a freelance back end developer with 12+ years of experience building server-side systems with Node.js, Django, Laravel, and Java. I architect APIs, design databases, and build the server-side logic that powers production web applications.
Whether you need a freelance backend developer for API development, database design, or a complete server-side architecture — I deliver clean, well-documented, production-ready backend systems. I also work with MEAN and MERN stack architectures for teams that need a single developer across the full JavaScript ecosystem.
Backend development is where application reliability, data integrity, and security are determined. I build backends with proper error handling, structured logging, input validation, rate limiting, and authentication — production-grade engineering that protects your data and scales with your user base.
Need to hire a backend developer? I'm Aleksandar Kuzmanovic — a freelance back end developer with 12+ years of experience building server-side systems with Node.js, Django, Laravel, and Java. I architect APIs, design databases, and build the server-side logic that powers production web applications.
Services & deliverables.
End-to-end.
RESTful API Development
Clean, versioned REST APIs with authentication, validation, error handling, rate limiting, and Swagger/OpenAPI documentation. Framework: Node.js, Django, or Laravel based on project fit.
GraphQL API Development
Flexible GraphQL schemas with resolvers, subscriptions, DataLoader for N+1 prevention, and type-safe code generation for strongly-typed frontend consumption.
Database Architecture
PostgreSQL, MongoDB, or MySQL schema design with proper normalisation, indexing, migrations, and query optimisation. Data modelling built for your application's access patterns.
Authentication & Authorisation
JWT, OAuth 2.0, social login, role-based access control, refresh tokens, and session management. Secure authentication that protects users and data.
Background Job Processing
Queue-based task processing for email delivery, report generation, data imports, webhook handling, and scheduled jobs. Reliable asynchronous processing with Redis.
Cloud Deployment & DevOps
Docker containerisation, CI/CD pipelines, AWS/Vercel/Railway deployment, environment management, logging, error tracking, and performance monitoring.
Why hire me for backend development?
Multi-Framework Backend Expertise
I build with the right tool for the job — Node.js for real-time and JavaScript-native projects, Django for rapid development with Python, Laravel for PHP ecosystems, and Java for enterprise systems.
API Design & Documentation
Clean, versioned REST APIs and GraphQL schemas with proper authentication, validation, error handling, rate limiting, and comprehensive documentation. APIs built for consumption by any frontend or mobile app.
Database Architecture
PostgreSQL, MongoDB, and MySQL schema design with proper indexing, query optimisation, migrations, and data integrity. I select SQL or NoSQL based on your data patterns and scale requirements.
Full-Stack When You Need It
As a full-stack developer, I can pair backend work with React or Next.js frontends. Get a complete application from one developer who understands both sides of the architecture.
Cloud & DevOps
Docker containerisation, CI/CD pipelines, AWS/Vercel/Railway deployment, environment management, and production monitoring. Your backend runs reliably in the cloud.
Security & Performance
Input validation, SQL injection prevention, CORS configuration, rate limiting, JWT/OAuth security, and query optimisation. Backends built to be secure and performant from day one.
My process.
Simple. Transparent.
API & Data Modelling
Define API contracts, data models, authentication requirements, and integration points. Clear technical specification that serves as the development roadmap.
Database Architecture
Schema design, relationship mapping, indexing strategy, and migration setup. Selecting the right database engine (SQL vs NoSQL) based on your data patterns.
Backend Implementation
Server framework setup, middleware chain, authentication flows, business logic, validation, error handling, and logging. Clean, documented code with proper architecture.
Testing & Security
Unit tests, integration tests, API endpoint tests, security audit, and load testing. Every endpoint verified under realistic conditions before production.
Deployment & Monitoring
Docker containerisation, CI/CD pipeline, cloud deployment, structured logging, error tracking, and performance monitoring. Production-ready from day one.
Technology Stack
What makes a great backend developer.
Backend development is the foundation of every web application. While frontends display data and collect user input, it is the backend that processes business logic, manages data, handles authentication, and integrates with external services. The quality of your backend directly determines your application's reliability, security, and performance.
A great backend developer makes three critical decisions correctly: database architecture (SQL vs NoSQL, schema design, indexing), API design (REST vs GraphQL, versioning, error handling), and authentication strategy (JWT, OAuth, session-based). These foundational decisions are difficult to change later and have compounding effects on development speed and application quality.
Aleksandar Kuzmanovic brings multi-framework backend expertise that enables selecting the best tool for each project. Node.js with Express.js for real-time applications and JavaScript-native teams. Django with Python for rapid development and data-heavy applications. Laravel with PHP for content-driven platforms and WordPress ecosystems. Java for enterprise systems requiring long-term stability. The framework selection is based on your project requirements, not developer preference.
Security in backend development is not an afterthought — it is an architectural decision. Input validation, parameterised queries, authentication token management, rate limiting, CORS configuration, and dependency auditing must be built into the foundation. Aleksandar's backends are secure by design, implementing OWASP best practices at every layer.
Modern backend development extends beyond writing server code. Container orchestration with Docker, CI/CD pipelines for automated deployment, structured logging for debugging, error tracking for production monitoring, and performance profiling for optimisation are all part of the backend developer's responsibility. Aleksandar delivers complete backend systems ready for production — not just server code that needs DevOps support.
Common questions.
Clear answers.
- What does a backend developer do?
- Builds server-side logic — APIs, databases, authentication, business logic, payment processing, email systems, background jobs, and third-party integrations. Ensures data flows correctly, securely, and efficiently.
- What backend technologies does Aleksandar work with?
- Node.js (Express), Django (Python), Laravel (PHP), Java. REST APIs and GraphQL. PostgreSQL, MongoDB, MySQL. Deployed on AWS, Vercel, Docker. Also MEAN/MERN stack architectures.
- Why hire a freelance backend developer?
- Specialised expertise, direct communication, cost-efficiency. You work directly with the engineer — no agency layers. Clean architecture, comprehensive API documentation, and freelance flexibility.
- Can you build both the frontend and backend?
- Yes. As a full-stack developer, Aleksandar pairs backend systems with React or Next.js frontends. One developer, complete application ownership, fewer communication gaps.
- What is the best backend language for my project?
- It depends on your requirements. Node.js for real-time and JavaScript-native stacks. Django for rapid development with Python. Laravel for PHP ecosystems. Java for enterprise. Aleksandar recommends the best fit based on your project's needs, team expertise, and scaling requirements.
- Do you write tests for backend code?
- Yes. Aleksandar writes unit tests, integration tests, and API endpoint tests. Test-driven development ensures that backend logic works correctly and regressions are caught before they reach production.
- How do you handle backend security?
- Input validation on all endpoints, parameterised queries to prevent SQL injection, JWT/OAuth for authentication, rate limiting to prevent abuse, CORS configuration, environment variable management, and regular dependency auditing. Security is built into the architecture, not bolted on.
- Can you optimise a slow backend?
- Yes. Aleksandar profiles backend performance issues — slow database queries, missing indexes, N+1 problems, inefficient algorithms, and caching gaps. Targeted optimisation that measurably improves response times.
Ready to start?
Send a message and I'll respond within 24 hours with a clear plan for your project.