Senior Java Developer (Remote EU)

5/2022 – 8/2023

Java developer at International Payments (PSS TIP) area within Master Chefs squad (9 FTE).

My responsibilities:

Developing and maintaining microservices handling system integrations (Spring Boot, Spring Integration Java DSL, Tibco, Active MQ, XML/XSL, Hibernate, Azure DevOps, Oracle, Maven)
Working on development, implementation and deployment of APIs. (Spring Web MVC, TDD)
Participating in Scrum ceremonies; daily stand-up, planning, refinement, retro. Improving the Way-of-Working (WoW)
Code collaboration via code reviews (Git, Azure DevOps)
Participating in production support during incidents.
Active contributor within the Java Chapter (CoE) by developing and presenting PoCs.

Application Development

2/2020 – 5/2022

As a member of the Nike ED&A (Enterprise Data & Analytics) domain, I have acted as a Lead / Senior Java Developer within the UMD (User-Managed Data) squad (6 FTE). My contributions started with the re-design of the UMD application.

UMD, leveraged by Nike globally, empowers business users to manage their own data structures and inject these into Nike's Data & Analytics space.

Application Development

2/2018 – 1/2020

Phase 2 of previously launched e-Recruiter in Q1.2018 aiming to provide both functional, technical and infrastructural enhancements according to the product roadmap:

- Decoupling of microservices by Pub/Sub async messaging for 3rd party
integrations (Spring Boot, RabbitMQ, Spring Cloud Stream)
- Converting all MVC based REST controllers to being non-blocking I/O (Java 11, Spring WebFlux/Project Reactor)
- Migrated Netflix components such as Hystrix, Ribbon, Zuul to respectively
Resilience4j, Spring Cloud Load Balancer, and Spring Cloud Gateway.
- Asynchronous distributed tracing to decrease load and runtime dependencies of the microservice landscape (Spring Cloud Sleuth, Istio Kiali/Jaeger, RabbitMQ)
- Setting up centralized logging and custom charts within a separate Kubernetes namespace. (ElasticSearch, FluentD, Kibana - EFK stack)
- Setup custom application monitoring and alerting for Circuit Breakers and Retries running in Istio Service Mesh (Actuators, Micrometer, Prometheus and Grafana)
- Migrated containers from AWS EC2 to Amazon EKS cluster with Istio Service Mesh in order to improve observability, security, and reliability
- Development of Candidate Job Dashboard and Search modules (Angular, Angular Material)
- TDD - Conducted PoC on producer- and consumer-driven contract testing (Spring Cloud Contract)
- Moving API landscape documentation for increasing agility and maintainability (SwaggerHub)
- Documentation of new procedures, run-books, release templates.

Java-Frameworks, Spring Framework, Advanced Message Queuing Protocol, Amazon Web Services (AWS), Elasticsearch