You will get Scalable Java APIs with AWS deployment |Custom Java Application Development
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Project details
Are you looking for a Java Backend Developer to handle complex API integrations with precision? I specialize in integrating a wide range of APIs, including payment gateways, geolocation services, Google APIs, OpenStack APIs, healthcare APIs, Firebase, and more.
With extensive experience in Java and Spring Boot, I ensure seamless communication between your backend and third-party services. I focus on delivering scalable, secure backend solutions tailored to your business needs.
Here’s what I offer:
• API Integration Expertise: Payment processing, geolocation, healthcare data, cloud services, and more.
• Custom API Development: Build and integrate RESTful APIs tailored to your requirements.
• Database Connectivity: Optimize database integration with services like MySQL, PostgreSQL, MongoDB.
• Performance Optimization: Implement caching, multithreading & secure transactions for fast, reliable performance.
• Security Implementation: Ensure robust authentication (OAuth/JWT), data encryption, and error handling.
Let’s work together to bring your vision to life with a world-class backend system.
Contact me now to discuss your project and create a custom backend solution.
With extensive experience in Java and Spring Boot, I ensure seamless communication between your backend and third-party services. I focus on delivering scalable, secure backend solutions tailored to your business needs.
Here’s what I offer:
• API Integration Expertise: Payment processing, geolocation, healthcare data, cloud services, and more.
• Custom API Development: Build and integrate RESTful APIs tailored to your requirements.
• Database Connectivity: Optimize database integration with services like MySQL, PostgreSQL, MongoDB.
• Performance Optimization: Implement caching, multithreading & secure transactions for fast, reliable performance.
• Security Implementation: Ensure robust authentication (OAuth/JWT), data encryption, and error handling.
Let’s work together to bring your vision to life with a world-class backend system.
Contact me now to discuss your project and create a custom backend solution.
Programming Languages
HTML & CSS, JavaScript, JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$499
|
Standard
$3,499
|
Advanced
$6,999
|
|---|---|---|---|
| Delivery Time | 10 days | 30 days | 70 days |
Number of Revisions | 2 | 4 | Unlimited |
Number of Pages | 5 | 10 | 15 |
Design Customization | - | ||
Content Upload | |||
Responsive Design | |||
Source Code | - |
44 reviews
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PH
Patrick H.
Mar 1, 2026
Java Developer with Expertise in Spring Framework
SA
Steve A.
Sep 17, 2025
30 minute consultation
SS
Sergey S.
Jul 14, 2025
Simple Ktor backend
Well done. Thanks so much.
ED
Eric D.
May 23, 2025
Lead Java Backend Developer
Harmeet was a fantastic addition to our team. They delivered clean, efficient, and well-structured Java front-end code with great attention to detail. Communication was always clear and timely, and they consistently met deadlines. Their ability to quickly understand requirements and adapt to our development process made the project run smoothly. Highly recommended for any front-end development work—would gladly work with them again.
TG
Tobias G.
Mar 11, 2025
Kotlin/Java Backend Prototype for Preoperative Planning Platform
Harmeet did great work on our project. She was always keen to understand the requirements in detail and completed her tasks swiftly and efficiently.
About Harmeet
Senior SaaS Architect | Java Spring Boot | Microservices | AWS
100%
Job Success
Sangrur, India - 7:56 am local time
I specialize in Java, Spring Boot, Microservices, AWS, PostgreSQL, MongoDB, Kubernetes, and scalable backend architecture for high-performance SaaS platforms.
Worked on platforms handling real-time workflows, payment systems, enterprise reporting, AI integrations, booking engines, analytics systems, and multi-tenant SaaS infrastructure.
I’ve developed enterprise-grade platforms for healthcare, fintech, e-commerce, and real-time applications, focusing on scalability, security, and long-term maintainability.
My expertise includes:
✔ High-performance REST APIs
✔ Microservices architecture
✔ Cloud-native AWS deployments
✔ Authentication & payment systems
✔ Enterprise integrations
✔ Performance optimization
Whether you need to modernize a legacy Java application, build a backend from scratch, or scale an existing SaaS platform, I can help architect and deliver reliable production-ready systems.
My Core Competencies
1. Java Development:
- Core Java: In-depth knowledge of Java’s features, collections, concurrency, and multi-threading
- Spring Framework: Expertise in Spring Boot, Spring MVC, Spring Security
- Microservices: Designing and implementing microservices architecture with Spring Cloud
- API Development: RESTful APIs with JWT, OAuth, and GraphQL integration
2. Mobile App Development:
- Android Development: Skilled in developing native Android apps using Java and Kotlin
- App Lifecycle: From UI/UX design to API integration and deployment
3. Database & Back-End:
- Database Expertise: Proficient in MySQL, PostgreSQL, and MongoDB for secure, scalable data management
- ORM: Working with Hibernate for object-relational mapping
- Server-Side Scripting: Building efficient backends with Java and Spring.
4. Deployment & Cloud:
- Cloud Deployment: Expertise in deploying Java-based applications on AWS, Azure, and Google Cloud
- Containerization: Proficient with Docker for application containerization and management
5. Security & Performance:
- Application Security: Implementing secure systems with Spring Security, OAuth, and data encryption
- Performance Tuning: Optimizing application speed, database queries, and server-side performance
Industries I Serve
- E-Commerce: Custom checkout systems, payment gateway integration, and scalable shopping carts
- Healthcare: HIPAA-compliant mobile apps and backend systems for patient management
- Finance: Developing secure and efficient transaction systems, real-time data processing
- Education: Learning platforms and mobile apps to enhance educational experiences
- Travel & Hospitality: Building booking engines, itinerary planners, and travel apps
- Real Estate: Custom property listings, user-friendly property search apps
Why Work With Me?
- End-to-End Solutions: From ideation and development to testing and deployment
- Scalable & Secure Architecture: Applications that grow with your business
- Cross-Platform Experience: Expertise in both web and mobile development
- Agile & Transparent Communication: Ensuring a smooth collaboration throughout the project
What I Can Help You Build
- SaaS backends
- REST APIs
- Microservices architecture
- Authentication systems
- Payment integrations
- Cloud deployment pipelines
- Enterprise dashboards
If you need a reliable backend engineer to build scalable APIs, SaaS platforms, or cloud-native Java applications, let’s discuss your project.
Keywords:
Spring Boot, Java Backend, SaaS Development, REST API, Microservices, AWS, Scalable Applications, SaaS Architecture, Platform Engineering, Distributed Systems, Event-Driven Architecture, Cloud-Native Development, Enterprise APIs, Multi-Tenant SaaS, AI Integrations, Kubernetes, Docker, Kafka, DevOps, System Design, Scalable Infrastructure, High Availability Systems, Fintech, Healthcare Platforms, Booking Engines, Real-Time Systems
Steps for completing your project
After purchasing the project, send requirements so Harmeet can start the project.
Delivery time starts when Harmeet receives requirements from you.
Harmeet works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering and Analysis
- Understand the client's requirements, goals, and target audience. - Identify technical, functional, and non-functional requirements.
Project Planning
- Break the project into smaller, manageable tasks or modules. - Create a project timeline with milestones. - Set up version control (e.g., GitHub) for collaboration and tracking.