About the Role
We are seeking an experienced Senior Java Developer with strong expertise in
payment systems and banking API integration. The successful candidate will design
and build mission-critical services that power our financial infrastructure — including
digital wallets, real-time settlements, reconciliation processes, and bank connectivity.
You will collaborate closely with product, compliance, and DevOps teams to ensure high
availability, performance, and regulatory compliance across our platform.
Key Responsibilities
 Design, develop, and maintain high-performance Java microservices for
payment processing and financial transactions.
 Integrate with banking APIs, PSPs, and payment gateways (e.g., SWIFT, FPS,
SEPA, VISA/MASTERCARD, or local clearing systems).
 Implement secure payment and settlement flows, including authorization,
posting, reconciliation, and refund logic.
 Work with event-driven architectures using Kafka and apply event-sourcing
design patterns where appropriate.
 Ensure data integrity and transactional consistency across multiple systems
(PostgreSQL, message brokers, and external APIs).
 Build and maintain RESTful APIs and WebSocket services; implement gRPC
integrations when needed.
 Collaborate with DevOps engineers on containerization (Docker),
orchestration (Kubernetes), and CI/CD pipelines.
 Participate in code reviews, testing, and monitoring improvements to ensure
system stability and scalability.
 Support compliance with security and regulatory requirements, including PCI-
DSS, KYC/AML, and Open Banking standards.

Qualifications & Technical Skills
Required:
 8+ years of experience in Core Java solution design and enterprise application
development.
 Strong knowledge of Spring Framework, Spring Boot, Spring Cloud, and
event-sourcing implementation.
 Proficient with common Java frameworks and tools: Spring,
JPA/MyBatis/Hibernate, Maven.
 Expert in Kafka, with a solid understanding of Kafka architecture,
producers/consumers, partitions, and topics.
 Hands-on experience building RESTful APIs and WebSocket services;
familiarity with gRPC is a plus.
 Experienced with testing frameworks (JUnit 5, Mockito) and writing
maintainable test suites.
 Skilled in PostgreSQL schema design, query optimization, and data migrations.
 Strong understanding of microservice design principles, including service
discovery, resilience, and observability; proven hands-on project experience.
 Familiar with Docker and Kubernetes for building and deploying distributed
systems.
 Understanding of OAuth 2.0 or OpenID Connect 1.0 is a plus.
 Proficient with Git and modern version control workflows (branching, pull
requests, CI/CD).
 Degree holder in Computer Science, Software Engineering, or a related
discipline.
Preferred:
 Experience working on financial systems, banking integrations, or payment
gateway platforms.
 Familiarity with double-entry accounting, ledger-based systems, or
transaction reconciliation.
 Experience with cloud environments (AWS, GCP, or Azure).

 Contribution to open-source projects on GitHub or other platforms is a strong
plus.
 Good command of English, both written and spoken.
 Strong interpersonal skills, with a proactive, analytical, and solution-driven
mindset.

Soft Skills
 Excellent communication and collaboration skills.
 Aggressive problem diagnosis and creative problem-solving abilities.
 Commitment to clean code, testing, and continuous improvement.
 Self-motivated, detail-oriented, and capable of working independently.