Java Developer Payment application

Infotree Global Solutions Inc.; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Job summary

Infotree Global Solutions Inc. is seeking a skilled Java developer to join the Payments Engineering team. You will work in a pod of 3–4 developers and adapt legacy applications to ISO 20022 changes, a new financial messaging standard.

You will thrive under time pressure and excel at understanding business logic and reverse engineering complex codebases. The role requires 4 days per week in the office, participation in requirements sessions, design discussions, and code reviews.

Qualifications

• Bachelor's or Master's degree in a computational field (CS, Engineering, Applied Math).
• 4+ years of relevant work experience.
• Solid grasp of Java, Spring, Hibernate, and DB2.
• Experience with Spring Boot, Kafka, MongoDB, Maven, Docker, RESTful APIs.
• Experience with event-driven / microservices and CI/CD pipelines.
• Familiarity with Git; banking/finance tech experience is a plus.

Responsibilities

• Participate in requirements gathering sessions with business users.
• Analyze, design and plan work with the Engineering team.
• Implement and test changes; participate in code reviews, UAT and releases.
• Think outside the box to improve the stack and deliver high-impact changes.

Skills

Strong analytical skills

Collaborates effectively

Excellent communication

Commercial focus & code quality

Education

Bachelor's or Master's degree in Computer Science / Engineering / Applied Mathematics

Tools

Java

Spring

Hibernate

DB2

Spring Boot

Apache Kafka

MongoDB

Maven

Docker

RESTful API design

Event-driven / microservices

Git / CI/CD (GitLab CI)

Job description

We are seeking a skilled and detail-oriented Java developer to join the Payments Engineering team. The candidate will work in a pod with 3-4 experienced Java developers and focus on adapting legacy applications for non-discretionary ISO20022 changes, which is a new financial messaging standard. An ideal candidate thrives in complex environments, is able to work under time pressure, is keen to understand business logic and excels at reverse engineering a complex code base to implement high-impact changes.

Key Responsibilities:

• Participate in requirements gathering sessions with business users

• Participate in analysis, solution design and planning the work with the Engineering team

• Implement and test changes, participate in code reviews, assist in UAT and code releases

• Think outside the box when implementing changes and improve the stack as you go along.

The position requires 4 days/week in the office.

Qualifications:

• A Bachelor's or Master's degree in a computational field (Computer Science, Engineering, Applied Mathematics or a related quantitative discipline)

• 4+ years of relevant work experience.

• A solid grasp of Java, Spring, Hibernate, and DB2

  • Spring Boot — dependency injection, auto-configuration, Spring Data, Spring Security

  • Apache Kafka — producers, consumers, Kafka Streams (stateful processing, state stores, aggregation), and Kafka Connect

  • MongoDB — document modelling, Spring Data MongoDB

  • Maven — multi-module project management, dependency resolution, build lifecycle

  • Docker — containerization, image builds

  • RESTful API design and development

  • Experience with event-driven / microservices architectures in a distributed systems environment

  • Familiarity with Git and CI/CD pipelines (GitLab CI preferred)

Preferred:

• Angular

• IBM MQ / JMS — queue managers, channels

• Infrastructure as Code — infrastructure provisioning and management

• ISO 20022 or financial messaging standards (SWIFT, CBPR+, FIN)

• Python scripting

• Experience in financial services, payments, or banking technology

• Strong analytical skills

• Ability to collaborate effectively and work in a global team

• Ability to stay commercially focused, whilst not losing sight of code quality

• Good communication skills.

Strong work ethic, ownership, willingness to engage and be challenged