Recommended expert

Frank Bohnsack

Software Engineer

Frank Bohnsack
Berlin, Germany

Experience

Jul 2020 - Present
5 years 7 months
Berlin, Germany

Software Engineer

Freelancer

  • Freelance software engineer focusing on backend (Python/Django) and frontend (VueJS).
Jan 2019 - Present
7 years 1 month
Zürich, Switzerland

Lead Software Engineer

iWay AG

  • As a Lead Software Engineer, I lead a team of internal and external software developers.
  • My main focus is on the backend. This includes REST APIs, middleware, and data migration.
  • We mainly use Python and its frameworks like Django, DRF, Starlette, or FastAPI.
  • I also feel at home in JS frontend systems like Vue or ExtJS.
Jan 2017 - Dec 2018
2 years
Zürich, Switzerland

Software Engineer

iWay AG

  • As a software developer, I was responsible for developing and maintaining internal software.
  • This includes customer backends and various REST backends for internal services (e.g., internal customer portal, gateways to SwissCom Fiber/xDSL ordering, VoIP provisioning, etc.) and databases.
  • We mainly used Python, Django, UWSGI, Nginx, and Celery/Redis.
  • I was also in charge of migrating and integrating the systems of the acquired deep AG.
Apr 2013 - Dec 2016
3 years 9 months
Chur, Switzerland

Operations Engineer

deep AG

  • As an operations and software engineer, I was responsible for running internal and customer infrastructure.
  • This included services like mail, DSL/RADIUS, DNS, and hosting, as well as setting up and maintaining hardware, and implementing and adapting software.
  • I was responsible for developing and maintaining internal software, including the billing and provisioning system and network and system monitoring.
  • 90% of my work was spent completely redeveloping the entire infrastructure. This included migrating all ISP services like DNS, web, mail, RADIUS, and implementing a REST API for each service.
  • The old Java/Perl based customer/service management system was completely reimplemented (Django+DRF/ExtJS) and migrated.
Jan 2008 - Mar 2013
5 years 3 months
Dortmund, Germany

Software & Product Development Engineer

Verizon Business

  • Analysis of business processes as well as project leadership and management roles in various projects with distributed international teams.
  • Development and maintenance of internal software, including mail systems, billing systems, VoIP infrastructures, network monitoring, configuration, and various order, pricing, and provisioning systems.
  • Development of various products as SOA architectures on application servers like Tomcat and IBM WebSphere.
  • Use of databases Oracle (versions 8, 9, 10), PostgreSQL, and MySQL.
  • Operation of internal applications on web server farms with Apache and Tomcat.
  • Development in Python, Perl, Java, C, and PHP.
  • Development of applications to support troubleshooting and 24x7 operation of complex SOA architectures.
  • Products: resale DSL, VoIP, email, web hosting, and custom solutions such as network and VoIP reporting for Daimler.
  • Development of software for router configuration (BGP) from RPSL data from RIPE, ARIN, APNIC, etc., in Python.
  • Development of strategies to identify bot networks based on NetFlow data.
Sep 1999 - Dec 2007
8 years 4 months
Dortmund, Germany

Internet Backbone Engineer

Verizon Business

  • Planning, expanding, and operating the MCI EMEA backbone (Cisco and Juniper hardware).
  • Developing software for network validation and backbone network configuration.
  • Internet routing and analysis of NetFlow traffic data.
  • Providing third-level support for the EMEA Network Operations Center, including 24x7 on-call duty.
Jul 1997 - Aug 1999
2 years 2 months

Internet Installation Engineer

Verizon Business

  • Installing and supporting customer connections (dial-up and leased lines).
  • Automating ordering and provisioning processes.

Skills

With Over 25 Years Of Experience In Software Development, I See My Strengths Mainly In Designing And Implementing Modern And Demanding Web Applications And Backends. I Place Great Importance On Clean, Readable, And Reusable Code, Automated Tests, And Smooth Integration.

  • Programming Languages: Python, Javascript, Perl
  • Frameworks: Django, Drf, Flask, Extjs, Vuejs
  • Software / Tools: Mysql, Postgresql, Mssql, Oracle, Redis, Uwsgi, Celery, Ansible, Sentry, Github, Gitlab, Jira, Confluence, Elasticsearch, Kibana, Debian, Centos, Cloudlinux

Languages

German
Native
English
Advanced

Education

Oct 1994 - Jun 1997

University of Applied Sciences Stralsund

Diploma Engineer (FH), Computer Engineering · Computer Engineering · Stralsund, Germany

Oct 1991 - Jun 1994

University of Rostock

Computer Science · Rostock, Germany

Oct 1990 - Jun 1991

Wismar University of Applied Sciences

Subject-specific university entrance qualification · Wismar, Germany

...and 2 more
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