Programming languages and technologies I have used, and when. The five levels correspond to the highest Dreyfus model stage (novice, advanced beginner, competent, proficient, expert, master) I achieved.

Programming languages

Python			2006-
Perl			2008-2021
Java			2004-2020
C++			1999-2020
C			1997-2020
R			2008-2020
Groovy			2022-
Rust			2021-2024
Go			2014-2016, 2025
PHP			2004-2005
Caml			2002-2005
BASIC			1997-2002
Pascal			1998
x86 assembly			1997-2003
Z80 assembly			1999-2001
68000 assembly			2001-2003

Web

(X)HTML & CSS			2004-
SVG			2008-2015
Javascript (ES5, JQuery, D3)			2015-
Apache and Nginx			2008-2020
Jekyll site generator			2020

Database technologies

MySQL			2008-
SQLite			2011-
PostgreSQL			2004, 2014-
DuckDB			2025-

Distributed computing

Platform LSF			2011-
HTCondor			2006-2010, 2017
Grid Engine			2017
PBS			2017
Slurm			2020

Workflow management

eHive workflow manager			2011-2025
Nextflow			2019-
Snakemake			2019-
Prefect			2023-
CWL			2016

Cloud and containerisation

Docker, Singularity			2016-
Docker Swarm			2017-2021
Kubernetes			2019, 2021-
Helm			2021-2024
OpenStack			2021-
Terraform			2021-2022
Google Cloud Platform			2020

Infrastructure

Linux environment (Debian, Ubuntu)			2003-
bash scripting			2003-
Homebrew			2015-
Conda			2021-
Git (command-line) & GitHub			2011-
CI/CD on Travis			2014-2020
CI/CD on GitHub			2019-
CI/CD on GitLab			2019-
Ansible			2021

Applications

Jira			2012-
Confluence			2011-
GitHub			2011-
GitLab			2021-
GitHub Copilot			2025-