Who am I?
IT Specialist, systems administrator, software architect and developer.
My experience in IT — continuously since 2002, professionally since 2009. It contains both software development in many languages and GNU/Linux administration.
Since 2013 I am expanding my expertise in the field of software quality, development automation and object-oriented software design. I am constantly transferring this knowledge to others. I have also experience on designing and implementing software development environments and procedures. I have a lot of experience on designing systems that work on a large scale.
Currently, I spend a lot of time on issues generally referred to as Cloud Computing and DevOps.
Privately — hiking, sailing and sport shooting. I'm an amateur competitor and licensed polish sport shooting referee. In a free time I also like to grab my photo camera and make some art with it. Since 2024 I'm a licensed Ham Radio operator, using the SP4TM callsign.
Knowledge and experience
Programming languages
- Go
- very good
- Ruby
- very good
- PHP
- good
- python
- little
- JavaScript
- medium
- Java
- medium
- C/C++
- little
Databases
- PostgreSQL
- medium
- MySQL
- medium
- MongoDB
- little
Webmastering
- HTML
- very good
- CSS
- medium
- WebSockets
- little
DevOps part 1
- Docker
- good
- Traefik
- good
- Nginx
- good
- Kubernetes
- medium
- KVM/LibVirt
- medium
DevOps part 2
- Chef
- good
- Terraform
- little
- Packer
- little
- Ansible
- little
CI/CD Tools
- GitLab
- very good
- GitLab-CI
- very good
Cloud Providers
- Google Compute Engine
- good
- DigitalOcean
- good
- Amazon Web Services
- medium
Spoken languages
- Polish (native)
- very good
- English
- good
Other
- Amateur photography
- very good
- Coaching
- good
- Sport Shooting
- good
- Sailing
- little
- Ham Radio
- little
Experience timeline
Senior Backend Engineer since 04/2020 GitLab Inc. contractor
Main responsibilities:
- design and maintenance of Hosted Runners for GitLab.com platform
- maintenance of GitLab Runner and related projects
Talk at "15 Sesja Linuksowa" 04/2018
Performing a talk Designing a CI/CD solution that processes a milion jobs each day at 15 Sesja Linuksowa — one of the Linux users conferences in Poland.
CI Reliability Expert since 05/2017 GitLab Inc. contractor
Main responsibilities:
- development of CI part of GitLab CE/EE projects and GitLab Runner project
- development of monitoring and alerting for CI infrastructure at GitLab.com
- maintenance of CI related infrastructure at GitLab.com
Coach at Rails Girls Tricity 03/2016
As an Rails Girls coach I was introducing three person team of girls into the world of programming and Ruby
on Rails.
More informations about Rails Girls project you can find at http://railsgirls.com/.
Backend Engineer since 12/2015 to 04/2020 GitLab Inc. contractor
Main responsibilities:
- software development — issues and features handling
- maintenance of GitLab Runner project
- on-call hero - handling GitLab.com outages and client's problems on scheduled duties (until 08/2016)
System Administrator, Software Developer 11/2014 - 12/2015 Sprint S.A., Olsztyn
Main responsibilities:
- management of servers and systems
- design and implementation of software development infrastructure
- devops — design and implementation of tools and configurations
- identification and implementation of new technologies
- implementation of CI/CD patterns (static code analysis, TDD, BDD, deployment)
- working with maps and GIS data
PRINCE2® Foundation Certificate 11/2013
November 6, 2013 I passed the exam and received certification at Foundation level of Prince2® project management methodology.
PHP Developer, Team Leader 03/2013 - 10/2014 Dituel Sp. z o.o., Olsztyn/Warsaw
Main responsibilities:
- design and development on porting to PHP a CMS software of the company (Java-based originally)
- design and development of the software created for clients of the company
- management of work of software development team
- network and servers management in the company's office in Olsztyn
PHP Developer 11/2010 - 03/2013 Redefine Sp. z o.o, Olsztyn/Warsaw
Main responsibilities:
- development of websites of the company
- design and development of CMS software of the company
Completion of training for coaches in NGOs 11/2007 ZHP, Olsztyn
In October, 2007 I completed training for coaches in NGOs. The training was realised by ZHP — the
largest and the oldest polish scouts organisation.
The training gave me a basic coaching knowledge and experience and prepared me to realise trainings at
county level. From 2007 till now I have conducted many of training sessions and I was
involved in planning and organisation process of several large courses.
Freelancer since 2004 self-employment since 12/2015
Freelance in software development and software design. Voluntary work related to the programming and management
of IT infrastructure. Image management and PR. OpenSource software development (own and contributed to).
Since December 2015 I'm officially and formally, according to polish law, an owner of my own company:
Tomasz Maczukin - IT Specialist.
Business related projects
Hosted Runners for GitLab.com 05/2016 - now
Since May 2016 I'm one of the designers, creators and maintainers of the Hosted Runners for GitLab.com platform. I helped evolve this platform from its baby years when only few public jobs were executed to its current state, where we execute more than 1 M CI/CD jobs every single day on the Hosted Runners only.
Issues I was involved with:
- operating of highly concurrent CI/CD compute service on a scale — executing more than 1 M tasks every day
- designing and implementing infrastructure, networking and GitLab Runner configuration
- designing and providing monitoring capabilities for the Hosted Runners platform
Maintainer of GitLab Runner 03/2016 - now
Since March 2016 I'm one of the maintainers of the GitLab Runner project, a tool that's one of the foundations of GitLab CI/CD.
Issues I was involved with:
- maintaining code quality and project structure
- designing and implementing features
- designing and maintaining GitLab Runner ecosystem
- managing monthly releases of GitLab Runner versions
Refactorization of one of company's main products 04/2015 - 12/2015
From April to December 2015 I was part of the development team involved in the process of refactorization and re-implementation of one of the most important business products of my employer.
Issues I was involved with:
- concepts and decisions in architectural scope
- devops — runtime, deployment and development tools
- design and implementation of tests (static, unit and functional)
CI/CD software development environment (rev. 2) 03/2015 - 12/2015
Containing:
- GitLab — as remote code repository and Code Review mechanism
- GitLab-CI — as Continuous Integration server
- git-flow — as workflow for Git repositories
- tests automation — static code analysis, unit testing, functional testing
- Docker — software containerisation
Moving to a new employer and new team, I've extended my knowledge and experience in the area of software engineering
quality and CI/CD, which ended with redesigning the software quality platform stack. I've implemented it in the new
form for my new team as well.
Environment was implemented with the employer. Particular configuration elements are unavailable due to provisions
of the contract.
Environment for developers team to ensuring software quality (rev. 1) 06/2013 - 06/2014
Containing:
- GitLab — as remote code repository and Code Review mechanism
- JenkinsCI — as Continuous Integration server
- git-flow — as workflow for Git repositories
- implementation of PSR standards
- tests automation — static code analysis and basics of PHPUnit
- Capistrano — as deployment mechanism (implementation of 'Continuous Deployment' pattern)
Making my first steps in the world of Clean Code, software engineering metrics and CI/CD automation,
I've designed and implemented a platform for my team to manage our software, its quality
and executing regular tasks.
Environment was implemented with the employer. Particular configuration elements are unavailable due to provisions
of the contract.
TwojaPogoda.pl 09/2011 - 04/2012
The biggest Polish website about weather and with weather forecasts. I was involved in the entire process of designing and creating a new version of website in 2012. Redesign did end with huge improvement of the website performance (load time of main page reduced from 30 seconds to under 1 second) and limiting the amount of consumed resources at the same time (backend servers saturation reduced from 95% to about 5% and finally the fleet scaled down by 60%).
Non-business related open source projects
IPv6 ULA Generator
Binary for generating IPv6 ULA (Unique Local Address), compatible with RFC 4193.
GitLab integration command for Git push
A binary that introduces the git gitlab-push command, which provides integration
with GitLab through push options. Focusing mostly in covering some common configuration that's
added when creating merge requests from the freshly pushed branches.
GoFront
Small web frontend used to redirect Go packages from own domain to a source control hosting provider like GitLab.
Go Version lib
A small library for handling version information tracking in software written in Go.
WhatevaERR
Because software development doesn't need to be always so serious!
Contact me
Contact methods
You cant contact me via e-mail or one of my social networks accounts:
GPG/PGP
You can also use PGP/GPG encryption if you like. Also, when receiving an e-mail message from me or when checking my git commits, you can expect that they will be signed with my GPG key. I'm signing all my e-mails since 2012, and since February 2016 I'm signing all my git commits and git annotated tags (excluding those created on my behalf by GitLab, GitHub and similar software).
My GPG key can be downloaded from keyservers or directly from here:
- ID:
-
0xE1626E3E26C0C9B5
- Fingerprint:
-
5C62 DF63 396C D290 5201 BBEB E162 6E3E 26C0 C9B5
- URL:
- https://maczukin.pl/tomasz-maczukin.asc