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Build and maintain REST APIs in Java to integrate third-party software with Utimaco’s hardware security modules (HSMs), following clean-code practices and OpenAPI specs.
Build and maintain Java backend services using TDD/BDD, refactoring and clean code, while collaborating in Agile sprints for a global media and telecom client.
Build and maintain Java backend services using TDD and Agile, focusing on clean code and RESTful APIs for a global adtech agency.
Designs and leads Paymentus’s enterprise payments platform, defining scalable microservices, APIs, and data flows while mentoring engineers and translating business needs into technical solutions.
Builds CRM web modules with Angular front-end and Java/J2EE middleware in a hybrid Gdańsk office.
Build and maintain Java-based internal banking tools (workflow, content management, automation) for HSBC’s EU teams using Spring, J2EE, and micro-services.
Builds CRM web modules in Angular2+ and Java/J2EE middleware to integrate phone systems with banking workflows, including testing and global rollout support.
Lead full-stack development for lottery systems, designing secure, scalable solutions and mentoring mid-level engineers using J2EE, Hibernate, JavaScript, and web services.
Builds Java-based crew scheduling software for airlines, working hybrid in Kraków to design and maintain aviation operations systems.
Build and maintain Java/Spring microservices for a global payments platform, owning development, integration, and releases within an Agile team.
Builds and maintains core Java-based financial reference data systems using Spring, React, and microservices, ensuring secure, scalable solutions for client lifecycle management.
Senior Java Developer builds backend services using Java (JEE/J2EE), Spring, Hibernate, and SQL for global client projects in an outsource team.
Builds and maintains mission-critical Java applications using Spring, Hibernate, and cloud architectures in a collaborative team setting.
Senior Java developer building a mission-critical aviation crew-management platform using Java/J2EE, Spring, Hibernate, and Oracle in a hybrid Kraków office.
Develops Java-based web applications and React frontends for Commerzbank’s online banking portal, integrating with REST/SOAP APIs and Kafka in an agile team.
Build and maintain scalable Java-based business applications for card processing and high-transaction environments using J2EE, Oracle, and middleware tools.
Build and maintain Java-based payment and transaction systems for merchants, using Spring/J2EE and Oracle, ensuring secure, scalable omnichannel payment solutions.
Build and maintain Java-based payment solutions and Oracle applications for a leading fintech provider, using Spring/J2EE and microservices to power card transactions and merchant services.
Develops SaaS back-end services in Java/J2EE, designs solutions, and integrates systems using Spring, databases, and APIs.
Develop Java-based ISTAR software for Canadian Army systems, designing APIs, data pipelines, and desktop clients that integrate sensor data and command-and-control subsystems.
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