Antonis is available for hire
Hire AntonisAntonis Christofides
Verified Expert in Engineering
Apache Developer
Lefkada, Greece
Toptal member since May 16, 2017
Bio
Antonis has over 20 years of experience writing software and administrating servers. He's written scientific desktop software in Delphi and various web-accessible databases with Python and Django, even making minor contributions to the Django platform itself. Excellent at writing, Antonis has authored a book on Django deployment and co-authored several scientific papers.
Portfolio
GRNET - National Infrastructures for Research and Technology
Ansible, Grafana, Elasticsearch, Nextcloud, Jitsi, Logstash, Ubuntu, Git...
Cognitera
Python, Django, Django REST Framework, PostgreSQL, Git, Azure, Keycloak
Cognitera
Django, Django REST Framework, GeoDjango, Ansible
Experience
- Apache - 20 years
- Debian - 17 years
- PostgreSQL - 15 years
- Python - 15 years
- Django - 10 years
- JavaScript - 10 years
- Ansible - 6 years
- NGINX - 5 years
Work Experience
Senior Developer and DevOps
2022 - PRESENT
GRNET - National Infrastructures for Research and Technology
- Installed Nextcloud for use by a company division as an alternative to Google Drive.
- Created dashboards using Logstash, Elastic, and Grafana.
- Installed Matrix/Element and Jitsi as alternatives to Google Drive/Calendar, Slack, and Zoom.
Technologies: Ansible, Grafana, Elasticsearch, Nextcloud, Jitsi, Logstash, Ubuntu, Git, Documentation, SQL
Team Lead
2023 - 2023
Cognitera
- Worked at Cognitera, a company that maintains the "Single Application for aid" Django application, where Greek farmers submit their application for EU subsidies. In 2023, the functionality had to be extended with "ecoschemes," and I oversaw the addition of this feature.
- Oversaw the development of "ecoselector", a Django application to help "Single Application for aid" users select appropriate ecoschemes.
- Suggested alternatives for hosting. For example, I wrote a report comparing Hetzner to Azure for the purposes of the company.
Technologies: Python, Django, Django REST Framework, PostgreSQL, Git, Azure, Keycloak
Senior Developer
2023 - 2023
Cognitera
- Managed a team of six tasked with designing and developing an application.
- Designed and developed a decision support system to help fill out a complex form related to EU agricultural subsidies.
- Proposed and implemented several company procedures.
Technologies: Django, Django REST Framework, GeoDjango, Ansible
Software Engineer (Independent Contractor)
2017 - 2019
ETME
- Developed a Django application for chemical water measurements management.
- Installed and managed GeoServer.
- Developed the OpenLayers front-end for a migration to GeoServer.
Technologies: Bootstrap, OpenLayers, GeoServer, Django, PostGIS, Gunicorn, Leaflet, SQL, GeoDjango
Senior Python Developer
2017 - 2018
Poder.io (via Toptal)
- Created and maintained microservices for an analytics data pipeline.
Technologies: Apache Kafka, Redis, Asyncio, Python
Ansible Consultant
2017 - 2017
Pulse and Opinion SA
- Wrote Ansible code to scale the company infrastructure.
- Trained staff.
Technologies: Ansible
Developer | DevOps | Researcher
1993 - 2017
Department of Water Resources and Environmental Engineering, National Technical University of Athens
- Developed Enhydris: free server software for the management of meteorological data through the web.
- Contributed to various research projects with responsibilities such as database design, software development, and environmental assessment.
- Developed and maintained software and web-accessible database for the storage and management of documents and research projects.
- Developed and maintained software and website for online weather data.
- Administered DNS, emails, and the web.
- Developed Hydrognomon: a free desktop software for hydrological time series processing.
- Maintained Hydronomeas: a hydrological simulation tool.
Technologies: Samba, BIND9, BIND 9, Apache, Bash, C, Django, Python, PostgreSQL, MySQL, Oracle, Debian Linux, HP-UX, Delphi, PostGIS, Gunicorn, Documentation, Writing & Editing, Subversion (SVN), Exim4, Mercurial, LDAP, Travis CI, Leaflet, Django REST Framework, Selenium, Windows, SQL, GeoDjango
Developer
2013 - 2015
Department of Agricultural Technology, Technological Education Institute of Epirus
- Designed and co-developed a system to provide irrigation advice to the farmers of the plain of Arta; it comprises Python command-line applications that perform spatial integration of meteorological variables and calculation of evaporation.
- Developed a Python/Django web application that calculates water balance and advises the end-user when and how much to irrigate.
Technologies: Pandas, NumPy, MapServer, GeoDjango, Django, Python, PostGIS, Gunicorn, Documentation, Writing & Editing, Leaflet, Selenium, SQL
DevOps
2012 - 2014
Vorgründungsgesellschaft GridMind Ivan Fernando Villanueva Barrio EU
- Set up highly available PostgreSQL with replication.
- Installed continuous integration.
- Designed and implemented scaling, failover, and failback.
- Designed and implemented backup and recovery.
- Wrote recovery plans.
Technologies: Lsyncd, uWSGI, NGINX, PostgreSQL, Puppet, Django, Python, SQL
Junior Engineer
1995 - 1996
Transeuropean Consulting Unit of Thessaloniki (currently called TREDIT)
- Prepared and supervised surveying teams in a parking survey.
- Processed the collected data and developed some software for this processing.
Technologies: Surveying, Data
Project History
Enhydris
https://github.com/openmeteo/enhydrisFree server software for the management of meteorological data through the web. Powers the site (http://openmeteo.org/).
Hydrognomon
Free desktop software for hydrological time series processing and is written in Delphi.
Aira
A system to provide irrigation advice to the farmers of the plain of Arta. I supervised its development.
Django-selenium-clean
https://github.com/aptiko/django-selenium-cleanA small library to make Django Selenium tests easier and cleaner.
Deploying Django on a Single Debian or Ubuntu Server
A book on Django deployment.
Resolving Conflicting Objectives in the Management of the Plastiras Lake: Can We Quantify Beauty?
http://www.itia.ntua.gr/en/docinfo/683/A scientific paper investigating some of the deeper assumptions of decision analysis.
Education
1999 - 2000
Master of Science Degree in Computer Science
University of Manchester, School of Computer Science - Manchester, UK
1988 - 1994
Diploma in Civil Engineering
National Technical University of Athens, Faculty of Civil Engineering - Athens, Greece
Skills
Libraries/APIs
Leaflet, Asyncio, OpenLayers, Pandas, NumPy
Tools
Ansible, Git, NGINX, Apache, uWSGI, Travis CI, Subversion (SVN), Puppet, Mercurial, Exim4, Grafana, Logstash, Keycloak
Languages
Python, JavaScript, SQL, Bash, Delphi, C
Frameworks
Django REST Framework, Django, GeoDjango, Bootstrap, Jest, Selenium
Platforms
Ubuntu, Debian, MapServer, HP-UX, Debian Linux, Oracle, Apache Kafka, Windows, Azure
Storage
PostgreSQL, Nextcloud, Redis, GeoServer, PostGIS, MySQL, Elasticsearch
Paradigms
Continuous Integration (CI), Samba
Other
Documentation, Writing & Editing, Release Management, BIND9, Gunicorn, BIND 9, Lsyncd, Data, Surveying, Computer Science, LDAP, Jitsi
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