You will get a scalable system with React ,Java, Kotlin, Spring Boot, Kafka, Posgtres.
Project details
I help businesses build scalable and reliable backend systems using Java, kotlin, Spring Boot, and event-driven architectures.
Currently working in a fintech environment, I have hands-on experience designing and maintaining microservices that handle real-time transactions, messaging (Kafka), and secure data processing.
What I can help you with:
1. Build REST APIs using Spring Boot
2. Design microservices architecture
3. Kafka integration (producers/consumers, event-driven systems)
4. PostgreSQL query optimization & database design
5. Debugging and fixing backend issues
6. Performance improvements for existing systems
7. Good command on app architecture and database structure.
I focus on writing clean, maintainable code and delivering solutions that work in real-world production environments.
If you're looking for someone who understands both development and system design, I can help.
Let’s discuss your project.
Currently working in a fintech environment, I have hands-on experience designing and maintaining microservices that handle real-time transactions, messaging (Kafka), and secure data processing.
What I can help you with:
1. Build REST APIs using Spring Boot
2. Design microservices architecture
3. Kafka integration (producers/consumers, event-driven systems)
4. PostgreSQL query optimization & database design
5. Debugging and fixing backend issues
6. Performance improvements for existing systems
7. Good command on app architecture and database structure.
I focus on writing clean, maintainable code and delivering solutions that work in real-world production environments.
If you're looking for someone who understands both development and system design, I can help.
Let’s discuss your project.
Programming Languages
JavaScript, Java, KotlinCoding Expertise
Performance Optimization, Security, DesignWhat's included $15
These options are included with the project scope.
$15
- Delivery Time 2 days
- Number of Revisions 1
- Source Code
Optional add-ons
You can add these on the next page.
Fast 1 Day Delivery
+$5About Adnan
Java Backend | Spring Boot, Kafka, Microservices | Fintech API
Karachi, Pakistan - 2:16 am local time
If you need someone who has actually shipped high-throughput financial systems (not just read about them), I can help.
─── What I bring ───────────────────────
Payment systems — ISO 8583, ISO 20022, financial middleware, transaction processing at <200ms latency with 100K+ daily transactions
Backend engineering — Java 8/11/17/21, Kotlin, Spring Boot, microservices, event-driven architecture (Kafka), REST/GraphQL APIs
Cloud & DevOps — AWS (EC2, EKS, Lambda, RDS, S3), Docker, Kubernetes, Terraform, GitHub Actions, Jenkins
AI integration — Spring AI, RAG pipelines, LangChain4j, AI-driven fraud detection (reduced support resolution time 30%)
Security — JWT, OAuth 2.0, OIDC, KYC/AML integrations (Jumio, Twilio, PingOne, FRAML)
Domain depth — Thought Machine CBS, Cardworks, FINEXUS, FIS, FRAML
─── Recent client wins ─────────────────
• Al Rajhi Bank Malaysia — rebuilt digital onboarding for a global Islamic banking platform; cut onboarding time 40%, integrated KYC/AML/identity stack end-to-end
• Neo Digital Labs — engineering payment gateway switch processing ISO 8583/20022 with AI fraud detection and Spring AI customer support assistant
• ICT Traders — led team of 4+ engineers, migrated on-prem ERP to cloud, reduced infrastructure costs 80%
─── How I work ─────────────────────────
I write clean, tested code (TDD, JUnit 5, Mockito), enforce code review discipline, and communicate proactively. I don't disappear — you'll always know where your project stands.
Available for: long-term contracts · architecture consulting · fintech/banking builds · team augmentation
Let's talk about your project.
Steps for completing your project
After purchasing the project, send requirements so Adnan can start the project.
Delivery time starts when Adnan receives requirements from you.
Adnan works on your project following the steps below.
Revisions may occur after the delivery date.
Could purchase project or send your requirements.
Could send your requirements and set meeting for more detail discussion of solution.