25.03.2026 aktualisiert

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Software Development Professional with Expertise in Site Reliability Engineering

Sengenthal, Deutschland
Deutschland
Sengenthal, Deutschland
Deutschland

Profilanlagen

cv_de.docx
cv_de.pdf
cv_en.docx
cv_en.pdf

Skills

InnovationJavaJavaScriptPHPMicrosoft WindowsAmazon Web ServicesApple IOSArchitekturMicrosoft AzureGeschäftsplanUbuntuCentOSCloud ComputingDebian LinuxDebuggingLinuxDevOpsElasticsearchIngenieurwesenProtocol BuffersHypertext Transfer Protocols (HTTP)PythonPostgreSQLSimple MailMySQLNode.jsScrumRuby On RailsRed Hat Enterprise LinuxRedisAnsiblePrometheusRubySoftwareentwicklungSQLSystemarchitekturTypeScriptWebRTCDatadogAWS CDKGoogle CloudTest-Driven DevelopmentReact.jsAWS LambdaGitCloudformationKanbanSystemadministrationKubernetesCassandraAWS FargateApache KafkaElastic KibanaTerraformgRPCMochaDockerGolangProgramming Languages
Freiberuflicher Software-Entwickler und Plattform-Architekt seit 2015 mit Schwerpunkt auf Go, Kubernetes und AWS. Ich entwickle verteilte Systeme, interne Plattformen und Automatisierungsloesungen — ueberwiegend in Umgebungen mit mehreren Hundert Entwicklern und Tausenden von Services. Meine Arbeit bewegt sich an der Schnittstelle von Backend-Entwicklung und Infrastruktur: eigene Kubernetes-Controller, CI/CD-Pipelines, Cloud-Migrationen und Werkzeuge fuer Entwicklerteams.

Einfachheit, Zuverlaessigkeit und Wartbarkeit stehen bei mir an erster Stelle.
Compute:Kubernetes with CRI-O, Docker, Kata, Fargate, ECS, AWS Lambda, Linux, Windows, MacOS Hosts
Observability:Prometheus, EFK-Stack (Elasticsearch, Fluentd, Kibana), Datadog, Grafana
Infrastructure as Code (IaC):Cloudformation, Terraform, AWS CDK, Azure ARM, Ansible, Puppet
Cloud Providers:Amazon Web Services (AWS), Google Cloud Platform, Microsoft Azure
Programming Languages:Go, Python, Typescript, JavaScript, ESnext, Ruby, PHP, Java, SQL
Databases:MySQL, PostgreSQL, Cassandra, Elasticsearch, Redis
OS:Linux (Debian, RHEL, CentOS, Ubuntu, Arch and Alpine), OSX, Windows
Protocols:HTTP, Protobuf, SMTP, GRPC, Kafka, WebRTC, XMPP, JSONschema
Methodologies:Git, Scrum, Kanban, Test-Driven-Development (TDD)
Frameworks/Test Suites:Go test, Kubebuilder, React.JS, Node.JS, Ruby on Rails, Mocha, Jest, Prometheus

Sprachen

DeutschMutterspracheEnglischverhandlungssicher

Projekthistorie

System Architect and Site Reliability Engineer

Juratherm GmbH

Industrie und Maschinenbau

50-250 Mitarbeiter

- Infrastructure automation
- Concept and Realisation of the general infrastructure
- Design and integrate Backup and Desaster recovery plans

Lead Go Developer

Wilde-IT GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

  1. Built a Kubernetes-native file integration platform in Go, distributed across core services and remote agents, processing around 10,000 jobs per minute
  2. Workflow engine based on a state machine with retry, cancellation and flow control between core and agents
  3. Pluggable protocol adapters for SFTP, SMTP and local filesystems — new sources or targets plug in without touching the core
  4. gRPC middleware chain for filtering, selective compression, PDF conversion, tokenization and templating
  5. PostgreSQL-backed job queue with stream-based S3 file transfer for reliable delivery under failure
  6. Kubernetes CRDs and controllers for workflow management, RBAC with multi-tenancy and enterprise auth via LDAP, OIDC and SAML

Site Reliability Engineer

Baxter International

Pharma und Medizintechnik

>10.000 Mitarbeiter

- Established reliable operation of 3 - AKS - kubernetes clusters in a development team of 400 developers, previously only accustomed to on premise deployments.
- Migrated 25 java-based apps to containers, automated github workflows and helm deployments for lifecycle management. This decreased the lead and deploy time for software changes from multiple hours to a maximum of 5 minutes.
- Migrated the company’s source code management system with 230 repositories from Bitbucket to GitHub enterprise. Strengthened security through the use of SAML, 2-factor authentication and SCIM based user provisioning.
- Created tools in go and typescript for engineering managers to self manage their team members and to enable role based access control for each of these applications within Azure AD.

Dev-Ops und Platform-Engineer

TeleSon AG

Konsumgüter und Handel

50-250 Mitarbeiter

  1. By implementing unix level automation, on premise and on AWS, we were able to reduce the downtime during incidents and improve the deployment time of all company owned servers.
  2. By changing the deployment method from manually provisioned servers and infrastructure to industry best practices (Infrastructure as Code - via CDK) I was able to increase the reliability and boost team confidence when deploying code changes
  3. By implementing a CI/CD deployment system on GitHub Actions we were able to reduce the amount of interactions that admins had to go through during deployment
  4. By introducing the company to containerized architecture (i.e. Kubernetes or more precise EKS) and deployments, we could reduce the time to deploy and deploy applications in isolation. Deployment times changed from around 30min for a full EC2 instance rebuild to less than 2min.

Dev-Ops Engineer and SRE

EnBW Energie Baden-Württemberg AG

Energie, Wasser und Umwelt

1000-5000 Mitarbeiter

- Design and develop system to automatically update all linux servers in the companies backend networks in regular intervals.
- Develop a headless (automated) command execution engine, which can run commands on remote servers securely.
- With custom-built go tooling, a bare-metal kubernetes cluster could be deployed in under 2 minutes compared to the previous time of 30 minutes when using kubespray. The kubernetes components are deployed in an existing kubernetes cluster, once per sub-cluster.
- Design and configure runtime security software for attack detection during the runtime of a linux process.

Site Reliability Engineer

ADB Safegate

Transport und Logistik

500-1000 Mitarbeiter

- Designed and enhanced a standardized deployment pipeline for quickly deploying kubernetes clusters with a standardized setup across different environments, platforms and infrastructure
- Support and guide the in-house development team with kubernetes training and scalable and fault-tolerant architecture patterns

Platform Engineer

Scout24 AG

Internet und Informationstechnologie

1000-5000 Mitarbeiter

- Built a kubernetes custom resource and controller in go, which offers a single, standardized interface for metrics, alerts, automatic scaling and user-facing communication endpoints. This decreased the deployment time from an average of 15 minutes to a mere 3 minutes and unrecoverable deployment failures, from an average of 1% to below 0.1%.
- Built automatic backup and restore pipelines for 5 clusters using velero. By building a custom UI, this process wraps the velero custom resources and allows for services to be moved across clusters in under 1 minute, well within the 1 hour RTO.
- During the process of carve-out, I participated in - 150 services (of the back then 600 services) were moved - without downtime - including relational databases, kubernetes controllers and resources.

Fullstack Developer and Platform Engineer

AutoScout24 GmbH

Internet und Informationstechnologie

500-1000 Mitarbeiter

- Develop React.JS for an online car selling platform
- Support with organising and executing an organisational carve-out
- Develop multiple kubernetes controllers, platform infrastructure, disaster recovery and security policies from scratch

Software Developer and Site Reliability Engineer

seven point.media GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

- Build a cash registry and client management system for fitness centers in React.JS, which is used by 600 clients in 10 countries.
- Build and maintain a platform product on AWS/EKS for enabling developers easy build and deploy to their PHP app in < 5min.

Software Developer

100 days Software Projects GmbH

Internet und Informationstechnologie

< 10 Mitarbeiter

- Develop an office solution for SMB
- Develop and design an E-commerce app from scratch
- Concept, Architectural-Design and development of a password manager
- Concept and Realisation of a Hosting and CI infrastructure
- Concept, Development of a Google-Drive like storage solution
- Concept, Development of a thumbnail generator

Site Reliability Engineer

Corscience GmbH & Co. KG

Pharma und Medizintechnik

50-250 Mitarbeiter

- Care, maintenance and servicing of the company's internal server landscape
- Design and development of in-house software applications
- Consolidate 20 in-house web services into a docker

React.JS Coaching

ERAMON GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

- Coach developers on React
- Integrating React into the company's legacy software platform

Software Architect and Developer

VATC Technologies Inc.

Öffentlicher Dienst

50-250 Mitarbeiter

- Design and architecture of a platform for secure storage and analysis of biometric data sets
- Design and architecture of a platform for automated aggregation and evaluation of activities in social networks

Software Developer

Jacor Online Marketing

Internet und Informationstechnologie

< 10 Mitarbeiter

- Development of an application to evaluate images and rate them

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