Senior Java Backend & FinTech Engineer · Amman, Jordan

Engineering trust
into every system.

I’m Ahmad Kisswani, a Java Developer and Software Engineer in Amman, Jordan, building secure, reliable backend systems for FinTech, payments, remittance, and enterprise operations.

With 5+ years of experience, I design and deliver production-ready applications using Java, Spring Boot, Microservices, REST and SOAP APIs, JPA/Hibernate, and relational databases. I turn complex financial requirements into maintainable services with clear boundaries, dependable integrations, and predictable behavior.

My work is strongest where security and reliability are non-negotiable: high-security financial applications, mutual TLS, encryption, certificates, webhook verification, idempotency, transaction integrity, data consistency, and robust error handling. I build with clean architecture, testing, observability, performance, and backward compatibility in mind.

I also engineer Distributed Systems with Kafka, Redis, Docker, PostgreSQL, Oracle, and monitoring tools—balancing scalability with practical operational simplicity. Based in Jordan’s Amman software development community, I’m open to senior Java backend opportunities with ambitious teams across the Gulf, USA, Europe, and remote-first organizations worldwide.

Experience 5+ years Java & enterprise systems
Core stack Java · Spring Boot Microservices · Distributed Systems
Global focus Gulf · USA · Europe FinTech · Secure backend platforms

01 / Selected work

Systems built for
real-world pressure.

FinTech integration

Visa Direct Payout Platform

Validation, payouts, FX, balance, and webhook APIs secured with mutual TLS and message-level encryption.

  • Java
  • REST APIs
  • mTLS
  • Webhooks
Distributed systems

Event-Driven Commerce

Order, payment, inventory, notification, authentication, and gateway services connected through Kafka.

  • Spring Boot
  • Kafka
  • Docker
  • PostgreSQL
Platform architecture

White-Label E-Commerce

A multi-tenant modular monolith with tenant isolation, extensible payments, inventory reservations, and RBAC.

  • Java 21
  • Redis
  • Flyway
  • Security
Enterprise integration

Secure Banking Connectors

REST and SOAP integrations using AES, RSA-OAEP, certificates, keystores, and robust data mapping.

  • SOAP
  • Encryption
  • Oracle
  • JAX-WS

02 / Expertise

A focused backend
engineering toolkit.

Backend

Java · Spring Boot · Spring MVC · Spring Security · JPA / Hibernate · REST · SOAP

Architecture

Microservices · Modular monoliths · Event-driven systems · API design · Design patterns

Data & messaging

Oracle · PostgreSQL · MySQL · Redis · Kafka · SQL optimization · Transactions

Delivery

Docker · CI/CD · Linux · Nginx · Maven · Prometheus · Grafana · Testing

03 / Contact

Let’s build software
that has to work.