Senior Backend Engineer, personio SE & Co. KG Munich
Jun, 2018 - Present
Background
Work Experience
Work Experience
Senior Backend Engineer, OC Development GmbH Prien am Chiemsee
Jan, 2017 - May, 20181 year 5 months
Senior Backend Engineer, PosterXXL GmbH Munich
Jun, 2017 - Dec, 20177 months
Maintain and improve the web shop and background services (Symfony 2, AWS)
Identify and fix random logouts by refactoring the session and shopping cart handing (AWS DynamoDB)
Plan and develop internal tools to support other departments
Create a concept and implement a service for handling background workers: Infrastructure (AWS Cloudformation), Continuous integration and deployment (Gitlab pipelines), Linting and testing, Monitoring and alerting (AWS Cloudwatch, Logstash, Kibana), Project setup (Symfony 3, Docker)
Full-Stack Software Engineer, joblocal GmbH Rosenheim
Jun, 2015 - May, 20172 years
Increase performance of the high traffic pages by analysing and refactoring database n+1 queries, business logic (NewRelic), optimizing data- and asset caching (Memcached, AWS Cloudfront)
Improve monitoring and alerting: Provide TV Status Board and an error monitoring tool with integrated ticket creation (AWS Cloudwatch, Geckoboard, Airbrake, Jira)
Reduce cost by introducing automatic ssl certificate management for 30+ domains (certbot, AWS Certificate Manager, AWS Route53)
Design, implement, test and document a comprehensive REST API (JSON-API Schema, Authentication, Rate Limiting, Caching - AWS Api Gateway)
Plan and provision infrastructure to host microservices: Infrastructure as Code (AWS Cloudformation)
Develop and apply security concept: Network (VPC, Firewall, Bastion) and Services (IAM Roles, Credentials)
Add load/message based automatic scaling (AWS ECS, Docker) and monitoring (AWS Cloudwatch)
Setup continuous integration and deployment using Jenkins Pipelines, PHPUnit
Create a concept about handling background processes like queued jobs and cronjobs as well as event pub/sub (AWS SNS and SQS)
Design and implement the local development environment (docker compose), test and production environments (AWS ECS)
Configure cost management (AWS Cost Allocation Tags/ Reports)
Plan, implement and deploy a microservice using test driven development (PHP Lumen) and migrate the data
Manage and provide support for Google Tagmanager
Web Developer, WebTec Braun GmbH Rosenheim
Jan, 2015 - May, 20155 months
Develop and support corporate websites and shops
Design and implement features for the experience gift voucher shop project
Manage linux server infrastructure
Identify and fix linux server performance issues: previous hosting provider change led to partition misalignmment
Technologies: LAMP Stack, Wordpress, OXID, Yii
Full-Stack Software Engineer, joblocal GmbH Rosenheim
Sep, 2011 - Dec, 20143 years 4 months
Identify, reproduce and fix bugs of the current job platform
Design and implement the next major version featuring multi-domain handling: Project architecture, database structure
Implement several domains (company, job_posting, job_application, ...) covering backend, frontend and workers in a team
Provision and manage linux server infrastructure: multiple webservers & loadbalancer, static content hosting & caching
Setup and manage the local development environment: automated linting and testing, build and deployment pipeline
Add infrastructure- and job platform monitoring and alerting/escalation (Zabbix, SMS)
Handle security related topics: iptables configuration, package/dependency updates and access control
Lead a major platform refactoring to provide multi-tenancy capability
Implement Apache Solr search integration (frontend, backend), install and configure the solr service, participate in search index optimization (synonym lists, scoring)
Design and implement a scalable system to run scheduled search queries based on customer saved search criteria
Develop a job vacancy email notification system triggered by scheduled search results (Mailchimp/Mandrill)
Cover business critical routes with automated end-to-end tests (PHPUnit, Selenium)
Evaluate and migrate to Amazon Web Services: provision infrastructure as code (AWS CloudFormation), replace self-hosted with AWS provided solutions (VPC, CloudWatch, EC2, RDS, S3, Elastic Beanstalk)
Office IT support, on-call duty
Web Developer, eraffe media GmbH & Co. KG Rosenheim
Mar, 2008 - Aug, 20113 years 6 months
Investigate and remove performance bottlenecks of the eraffe.de community portal
Reproduce and fix most important bugs
Design and implement the next version 3 of the eraffe.de community portal: design the database layout, develop the PHP/MySQL based backend as well as the HTML/JS frontend
Provision and manage linux server infrastructure
Technologies: PHP, HTML, JavaScript, MySQL, Apache, Nginx, Varnish Memcached/ APC SphinxSearch
Web Developer, Kuse GmbH Werbeagentur Traunstein
Sep, 2004 - Feb, 20083 years 6 months
Develop and maintain a PHP/MySQL based content management system
Design and implement corporate websites using the CMS
Provision and manage a hosted linux server
Design and prototype a single page app to evaluate a new ad format
Technologies: PHP, HTML, JavaScript, MySQL, Apache, Debian