You will get a secure, scalable REST API with JWT authentication
Project details
You will receive a secure, scalable, and production-ready backend system built as a RESTful API using .NET Core or Spring Boot. I design clean, layered backend architectures with proper separation of concerns (controller, service, repository), JWT-based authentication, structured validation, and optimized database interaction. My focus is on long-term maintainability, security, and performance—not quick prototypes. Whether you need an MVP backend, SaaS API module, or internal system service, I deliver robust and well-documented solutions ready for real-world use.
Programming Languages
Java, TypeScript, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$400
|
Advanced
$850
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Ahsan
Senior .NET / Java Backend Engineer | FHIR, EMPI & API Architecture
Karachi, Pakistan - 1:01 pm local time
I specialize in:
HL7-FHIR interoperability engines
EMPI systems with deterministic and probabilistic matching
REST API architecture & enterprise integrations
EHR governance, ONC alignment & compliance-driven backend design
Microservices, concurrency control & performance optimization
Azure-based cloud deployments & scalable infrastructure
Recent Highlights
Led end-to-end delivery of a complete backend platform including REST APIs, business logic layers, database architecture, and Azure cloud infrastructure
Architected a FHIR interoperability engine integrating with Azure FHIR Server
Built a production-grade EMPI engine resolving cross-system patient duplication
Implemented governance-aligned backend systems supporting ONC-aware workflows
Additional Experience
FinTech & Payments: Secure payment portals, transaction safety, session management, thread-safe backend systems
Backend Engineering: REST APIs, microservices, background services, distributed auth, concurrency control, and performance tuning
Data & Cloud:
SQL Server (T-SQL), PostgreSQL, Oracle, Entity Framework, Hibernate, AWS & Azure deployments, cloud-based integrations
Steps for completing your project
After purchasing the project, send requirements so Ahsan can start the project.
Delivery time starts when Ahsan receives requirements from you.
Ahsan works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement & Architecture Review
Analyze functional requirements and define API structure.
Core API Development
Implement endpoints, business logic, and database integration.