Robin Sadlo
Senior Cloud & Backend Engineer
Experience
Senior Cloud & Backend Engineer
Media-Saturn-Holding GmbH
- Implemented applications with Kotlin and Ktor as microservices
- Used MongoDB in MongoDB Atlas cloud
- Asynchronous communication between services using Google Pub/Sub
- Used Kotest and Mockk for unit tests
- Developed an administration frontend with TypeScript, React, and Express.js
- Provisioned environments in GCP using Terraform
- Implemented CI/CD processes with GitHub Actions
- Operated scalable production and testing environments in GCP with Kubernetes, Helm, and Flux CD
- Monitored environments with Prometheus and Grafana
- Provided BI data in Google BigQuery data warehouse
Lead Software Developer
Codeagle GmbH
- Implemented the backend with Java and Spring Boot
- Developed a Java GraphQL client for the monday.com API
- Deployed the application as a container in AWS ECS
- Used Amazon SQS, ELB, and CloudFormation
- Built the frontend as a Chrome browser plugin with TypeScript and React 18
- Integrated the plugin into Xing and LinkedIn
- Automated tests with JUnit, Mockito, and Wiremock
- Set up the CI pipeline with automated AWS deployments in GitLab
Lead Software Developer
Deutsche Telekom IT
- Followed agile methods with Scrum and managed the project in Jira
- Implemented the backend with Kotlin and Spring Boot
- Used Amazon SQS
- Developed the frontend with TypeScript, Vue.js, and the internal UI framework 'scale'
- Automated tests with JUnit, Mockito, and Wiremock
- Set up the CI pipeline in GitLab
- Delivered the application as Docker images
- Operated the application in AWS
Backend Developer
Fiducia & GAD IT (now Atruvia)
- Implemented microservices with Java and Spring Boot
- Used Oracle Database
- Automated REST API tests with Postman
- Unit tests with JUnit
- Operated in OpenShift for production and testing environments
- Monitored performance with Dynatrace and Graylog
Software Developer
Bundesamt für Migration und Flüchtlinge
- Specified the application using Domain-Driven Design
- Implemented with Java, Spring Boot, and Axon Framework
- Applied CQRS and Event Sourcing
- Persisted data in Oracle Database
- Built REST interfaces and documented them with Swagger
- Developed web UIs with Angular and TypeScript
- Version control with Git and Bitbucket
Software Developer
Freelance
- Backend implementation with Kotlin and Spring Boot as microservices
- Service discovery and gateways with Eureka, Zuul, Hystrix and Ribbon
- Message broker with RabbitMQ and Spring AMQP
- Persistence in Neo4j
- Web interfaces with Vue.js
- Deployment with Docker and Docker Compose
Software Developer / Atlassian Consultant
Schwenninger Health Insurance
- Automatic conversion of customer emails into Jira issues
- Solr search index setup and integration with Jira
- Automatic lookup of sender address and display of relevant data
- Search mask implementation for full-text and field-specific search in Jira
- Display of customer information in Jira issues
- Email template implementation for automatic replies
- External archiving system integration
- Development with Java, JavaScript, and Vue.js
Software Developer / IT Consultant
Scolution GmbH & Co. KG
- Hosting infrastructure automation for Atlassian applications
- Ansible configuration and YAML inventory files
- Linux server installation and hardening with Ansible
- Application operation with Docker and Docker Compose
- Monitoring with Prometheus and Grafana and alerting through OpsGenie
- Centralized log collection with Graylog
- Implementation of scripts and backup mechanisms with Python
Software Developer / Atlassian Consultant
Various Project Partners
- Analysis, modeling, and automation of business processes in Jira using BPMN
- Implementation of automated process steps with Groovy/Scriptrunner
- Training on Groovy/Scriptrunner and maintenance of automated processes
- Unit testing with Groovy and Spock
- Jira plugin development with Java and Spring for complex requirements
- UI adjustments with JavaScript and Vue.js
Software Developer
essendi it GmbH
- Development of an application for issuing and managing digital certificates
- Modular architecture with OSGi and Apache Karaf
- Backend implementation with Java and OSGi services
- REST API with Jackrabbit Content Repository
- Frontend with JSF and PrimeFaces
- Process control with Camunda BPMN Engine
- Certificate processing with BouncyCastle
- Testing with JUnit and Selenium
- Advising the product owner on security and PKI
Software Developer
Optima packaging Group (essendi it GmbH)
- Developed a web application for managing maintenance manuals in custom machine manufacturing
- Backend development in Java EE
- REST web services for a GWT frontend
- Persistence with MySQL and Hibernate
- Database schema management with Liquibase
Software Developer
Hohenlohe aktiv Tours (essendi it GmbH)
- Adapted the Magento webshop for time- and quota-based tour booking
- Implemented a frontend wizard with real-time quota checking
- Created and sent gift card PDFs upon payment receipt
- Displayed participant lists for operators
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (7.5 years), Retail (3.5 years), Manufacturing (1.5 years), Telecommunication (1 year), Banking and Finance (1 year), and Government and Administration (0.5 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (11.5 years), Product Development (7 years), Business Intelligence (3.5 years), Project Management (1 year), and Quality Assurance (1 year).
Summary
I have extensive experience in developing modern cloud solutions with Kotlin, Java, and Spring Boot, and I have proven my skills in microservices architecture and implementing scalable cloud infrastructures in numerous projects.
In particular, I have strong expertise in cloud technologies (GCP, AWS), continuous integration and deployment (CI/CD), as well as solid knowledge in frontend and backend development with modern frameworks like React and Vue.js. I recently demonstrated my ability to successfully carry complex projects from concept to delivery at Media-Saturn-Holding GmbH.
Skills
Industry Experience: Retail / E-commerce, Banking, It Services, Manufacturing, Transportation & Logistics, Insurance, Special-purpose Machinery, Telecommunications
Methodical Skills: Analysis And Design, System Specification, System Architecture, Testing, Migration, Bpmn
Architecture Styles: Microservices, Monolith, Soa, Event-driven, Hexagonal Architecture
Design Patterns: Singleton, Mvc, Decorator, Dependency Injection, Abstract/factory Method, Redux, Observer, Pub/sub, Cqrs
Programming Languages: Kotlin, Java, Javaee, Javascript, Typescript, Python, Groovy
Frontend Frameworks: Vue.js, React, Angular, Jsf, Primevue, Bootstrap
Backend Frameworks: Spring, Spring Boot, Ktor, Osgi, Hibernate, Axon, Camunda
Project Management: Scrum, Agile Software Development, Kanban, Waterfall Model, Jira, Confluence, Safe
Testing: Kotest, Mockk, Junit, Mockito, Wiremock, Testcontainers, Selenium
Development Paradigms: Object-oriented Programming, Functional Programming
Interfaces: Rest, Graphql, Soap, Grpc
Development Environment: Intellij, Webstorm, Visual Studio Code
Operating Systems: Linux, Windows
Databases: Mysql, Postgresql, Mongodb, Neo4j, Mariadb, Redis, Oracle Database
Web Technologies: Html, Css, Json, Ajax, Xml, Sass/less
Development Tools: Git, Github, Gitlab, Gitlab (Ci), Bitbucket, Bamboo, Svn, Jenkins
Cloud (Gcp): Kubernetes Engine, Pub/sub, Bigquery, Google Cloud Storage, Google Cloud Logging
Cloud (Aws): Ec2, S3, Fargate, Iam, Elb, Rds, Cloudformation, Route 53, Certificate Manager, Secret Manager, Cloudwatch, Sdk, Ecs, Sns, Sqs
Devops/infrastructure: Continuous Integration/continuous Deployment (Ci/cd), Kubernetes, Docker, Helm, Fluxcd, Terraform, Ansible, Docker Compose, Prometheus, Grafana, Grafana Tempo, Grafana Loki
Languages
Education
Duale Hochschule Baden-Württemberg
Bachelor of Science · Business Informatics – Software Engineering · Germany
Certifications & licenses
AWS Certified Cloud Practitioner (CLF-C01)
ACP 300 – Agile Development with Jira Software
ACP 600 – Project Administration in Jira Server
Profile
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