Enis S. - Software Developer

Munich, Germany

Experience

May 2023 - May 2025

2 years 1 month

Berlin, Germany

Software Developer

50Hertz Transmission GmbH

Participated in the gradual modernization of components to cloud-native 12-factor applications
Worked closely with the Business Operations team to eliminate manual processes and fix several performance bottlenecks
Designed and implemented a CI/CD pipeline to boost developer productivity, enforce quality and security checks, and automate product delivery
Migrated multiple components to the OpenShift Kubernetes cluster
Built a monitoring stack from scratch with Prometheus and Grafana to monitor services running in OpenShift
Developed dashboards in both Grafana and Splunk for operational transparency
Implemented an OIDC/OAuth2-based single sign-on (SSO) solution with Keycloak to secure multiple applications
Technologies: Java, Spring, Quarkus, Kafka, MySQL, Cassandra, Redis, Spring Data, Hibernate, Docker, Kubernetes, OpenShift, Keycloak, OIDC, OAuth2, Helm, Prometheus, Grafana, Splunk, Spark

Mar 2023 - Present

2 years 10 months

Munich, Germany

Architect Consultant

OpenValue

Presented the talk "Communicating our APIs: Enhance Provider and Consumer Interaction" at the Java User Group Munich
Gave the talk "3 Approaches in API Development" at the OpenValue Düsseldorf meetup

Sep 2020 - Feb 2023

2 years 6 months

Munich, Germany

Staff Engineer

Unzer GmbH

Architected critical security components to meet PCI DSS certification requirements, including JWT-based authentication with OAuth2.0
Responsible for architecture and guiding other teams contributing to the new platform
Implemented an event-driven chargeback processing based on a serverless architecture
Achieved all project goals and enabled a smooth handover through strong communication skills
Technologies: Kotlin, Spring WebFlux, Kafka, AWS Lambda, MongoDB, PostgreSQL, Spring Data MongoDB/R2DBC, Docker, Kubernetes, Helm, AWS, Datadog, Terraform, OAuth2.0, JWT

Dec 2018 - Sep 2020

1 year 10 months

Munich, Germany

Software Architect

Wirecard Technologies

Tackled complex architectural challenges to ensure high availability, high throughput, distributed development and PCI DSS certification
Served as technical lead for the new platform and conducted training sessions for internationally distributed teams
Used expertise in designing reactive systems to achieve project milestones
Technologies: Java, Akka, gRPC, Protobuf, Event Sourcing, CQRS, Cassandra, Prometheus, Grafana, Datadog, Ansible, DDD, Reactive, NoSQL, Agile, Scrum

Mar 2015 - Nov 2018

3 years 9 months

Munich, Germany

Senior Software Engineer

Wirecard Technologies

Developed an API gateway that orchestrates multiple payment methods as a single transaction
Acted as technical point of contact for several modules, including onboarding and mentoring new team members and ongoing module maintenance
Technologies: Java, Spring Boot, Spring MVC, Spring Data, Apache Camel, JPA, Spring Cloud Config Server, Oracle DB, MySQL

Sep 2014 - Feb 2015

6 months

İstanbul, Turkey

Team Lead

Hitit Computer Services

Led a team of 4-5 developers to successfully meet project milestones
Technical lead for payment integrations of the flight reservation and ticketing system
Lead for check-in, boarding, and self-service kiosk integrations
Technologies: Java, Java EE, Servlet, JSF, JSP, SOAP

Nov 2009 - Aug 2014

4 years 10 months

İstanbul, Turkey

Senior Analyst Programmer

Hitit Computer Services

Extended the flight booking software with new payment methods
Certified the airline check-in system for operation at additional airports
Integrated payment methods like PayPal, China Union Pay, Global Collect, Asseco EST, Garanti, B&S, Sofort, and POS terminals
Successfully certified the airline software with airport IT infrastructure providers (SITA CUTE, SITA CUSS, ARINC MUSE, Resa)
Developed interfaces to peripherals like boarding pass and baggage tag printers, kiosks, boarding gate readers, magnetic stripe and OCR readers
Technologies: Java, Java EE, Servlet, JSF, JSP, SOAP

Feb 2009 - Oct 2009

9 months

İstanbul, Turkey

Web Application Developer

AEC Teknoloji

Developed e-commerce websites
Technologies: C#, ASP.net

Jul 2008 - Jan 2009

7 months

İstanbul, Turkey

Software Engineer

Garanti Bank

Implemented a PDF report generator
Technologies: Java

Summary

Enis is an experienced and motivated software developer and hands-on architect who has been working with Java since 2008.

He specializes in platform modernization in complex environments, especially with Java, Kotlin, Spring, Quarkus, Kafka and Kubernetes. Enis has successfully helped several companies with cloud-native transformation.

He is a good communicator, regularly presents at community events and places great value on high-quality documentation.