Wojciech Chemijewski, Developer in Warsaw, Poland
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Wojciech Chemijewski

Verified Expert  in Engineering

Software Developer

Warsaw, Poland
Toptal Member Since
May 2, 2019

Wojciech is an experienced automation & deployment engineer with a demonstrated history of working in the IT industry. He has extensive experience in programming (Perl, Ruby, and Bash) and the development of complex, reusable deployment automation, orchestration, maintenance, migration, monitoring, and environmental assessment tools. He’s able to work in international teams, product management, product engineering, consulting, sales, and support.


Ruby, Cloud
Jenkins, Ruby, Chef, Oracle Cloud
Oracle Directory, Oracle Directory Server Enterprise Edition (ODSEE)




Preferred Environment

Git, Atom, Linux

The most amazing...

...thing I’ve built was a Chef orchestration & deployment toolkit to automate deployment SaaS products, based on multitude mutually dependent software components.

Work Experience

Principal DevOps Engineer

2018 - PRESENT
  • Designed and developed an email cloud service.
Technologies: Ruby, Cloud

Principal Member of the Technical Staff, Communications Global Business Unit

2014 - 2018
  • Designed and developed the automation of the continuous deployment of SaaS products on the Oracle Cloud Infrastructure.
  • Supported pre-sales and post-sales activities of the field and support personnel; those related to the Oracle Communications Unified Communications Suite (OCUCS).
  • Acted as the technical lead of a geographically dispersed engineering team.
  • Designed SaaS services which involved numerous Oracle Communications and Oracle Middleware software components, across several dozens of Linux virtual machines.
  • Developed Chef- and Ruby-based cloud deployment automation toolkit which dynamically orchestrates deployment and configuration management of arbitrary software using Chef, across a multitude of mutually dependent virtual machines, in order to support the automated deployment of the SaaS services.
  • Developed Chef recipes used to automatically deploy Oracle and third-party software in order to support SaaS services.
  • Built up continuous deployment pipelines on the Oracle Cloud Infrastructure using Jenkins.
  • Prepared proof-of-concept environments using Docker.
  • Delivered a training session on the OCUCS reference deployment to the technical teams in the Asia Pacific region on-site and remote support to a large service provider OCUCS deployment for a partner in Brazil.
Technologies: Jenkins, Ruby, Chef, Oracle Cloud


2011 - 2014
  • Gave advanced support of directory services based on the Oracle Directory Server Enterprise Edition (ODSEE).
  • Consulted on environments based on the OCUCS.
  • Continuously administered and maintained a large (multiple dozens of millions of entries), mission-critical directory environment which is based on ODSEE for a telco customer in Poland. Designed and implemented expansions to that environment.
  • Supported other multi-million ODSEE environments at telco customers in the EMEA region (Poland and Turkey).
  • Deployed and maintained OCUCS environments and migrations from its previous versions (Norway and China).
Technologies: Oracle Directory, Oracle Directory Server Enterprise Edition (ODSEE)

Principal Tech | Consultant in the EMEA Services Technology Office

2009 - 2011
  • Designed and deployed Symantec messaging and web security products for customers throughout the entire EMEA region.
  • Supported the field consulting and sales teams in building consulting opportunities involving these products.
  • Continuously collaborated with other teams like product management and engineering with regards to deployment projects.
  • Actively made contributions as an architect in activities of the EMEA Service Providers sales team.
  • Design and implemented the Symantec Brightmail Message Filter, Symantec Brightmail Traffic Shaper, Symantec Brightmail Gateway, and Symantec Web Gateway at a service provider and enterprise customers in multiple countries of the EMEA region.
  • Prepared and delivered training sessions on these products to customers and partners.
  • Participated in pre-sales activities involving these products in various countries.
Technologies: Symantec Brightmail

IT Architect for Software, Sun Professional Services

2001 - 2008
Sun MIcrosystems
  • Designed and deployed messaging environments based on the Sun Java Systems Communications Software (now: OCUCS) with up to several millions of users.
  • Designed and implemented migrations from other messaging environments (like open source software, OpenWave, Microsoft Exchange) to Sun's environment.
  • Designed and deployed directory services based on the Sun Java Systems Directory Server (now: ODSEE, up to environments supporting multiple dozens of millions of entries).
  • Maintained the environments.
Technologies: Perl, Linux, Solaris

System Administrator | Head of the IT Team

1996 - 2000
Polish Press Agency
  • Distributed services via the means of internet.
  • Managed the computer network and servers.
Technologies: Microsoft SQL Server, Perl, Windows, Linux, Solaris

Operator of Microcomputers

1995 - 1996
Warsaw Agrucultural University
  • Provided technical support for users of the university computer network.
Technologies: Perl, OpenVMS

Mail Migration Projects

As a professional services consultant, I've worked on several mail migration projects at customers.

Such projects would involve analysis of the current mail environment, design a new one and migrating the mailboxes. It involved preparing documentation, and automation scripts that would perform the task. The most important objective was to design and perform the migration in a way, that would minimize the impact on users' ability to use the service as much as possible.

Directory Service

For several years, I've worked on this a directory services-related project where I designed highly available business-critical systems for a telco operator.

The directory service would be an underlying component for many other entities offering the services to customers and would contain information in quantities measured in hundreds of millions of LDAP entries. The resilience qualities of this system would span all layers including network, storage, computer, and applications.

My role was mainly related to the design, implementation, and support of the application (directory service) part.
1992 - 1999

Master's Degree in Electronics

Warsaw University of Technology - Warsaw, Poland

JULY 2018 - JULY 2020

Oracle Cloud Infrastructure 2018 Certified Architect Associate



Chef, Jenkins, Atom, Git, Oracle Directory, Symantec Brightmail, AWS SDK


Ruby, Perl, Bash, TeX




Oracle Cloud, Microsoft SQL Server


Linux, Solaris, Windows, Docker


LDAP, Email Protocols, Spam Filtering, OpenVMS, Oracle Directory Server Enterprise Edition (ODSEE), Cloud

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