Tadeusz Sośnierz

A pragmatic, self-sufficient and versatile programmer with a decade of remote work expertise.

Recent experience

• HKS3 (since 2024)
  Key technologies: Perl, Vue.js

  Main responsibilities:

  • Built custom plugins and integrations for the Koha ILS for customers
• The Matrix Foundation (contractor, 2024)
  Key technologies: Typescript, React

  Main responsibilities:

  • Developed Matrix Migrator – a web-based tool to migrate Matrix accounts between homeservers
  • Maintained the IRC bridge, working mainly on incoming security issues
• Element (full-time, 2021-2023)
  Key technologies: Typescript, Rust, Python

  Main responsibilities:

  • Maintained “bridges” between Matrix and other protocols (IRC, XMPP, Slack, Teams)
  • Developed EMS Cloud – a SAAS platform for Matrix servers and integrations

  Highlight: Led development of Group Sync – a bridge between external user directories and Matrix.
  Group Sync maintained Matrix rooms, spaces and ACLs based on group membership data pulled from LDAP, Azure AD or received via SCIM.
  Implemented in Typescript, using Matrix as a storage layer with heavy focus on integration testing.

• Sidnet Solutions (contractor, 2016-2021)
  Key technologies: Perl, Rust, Go

  Main responsibilities:

  • Created and maintaining several internal projects using Dancer, DBIx::Class, Moose
  • Worked with The Hut group (2020) building microservices for a cloud management project in Go

  Highlight: Led development of Floorcheck – a Windows desktop application analyzing large (100GB+) sets of spatial data, analyzing floor flatness and producing AutoCAD-compatible drawings.
  Included a purpose-built filesystem, and several algorithms inspired by game development techniques.
  Implemented in Rust, using gtk-rs, with heavy focus on performance.

• Runbox Solutions AS (contractor, 2016-2021)
  Key technologies: Perl, Typescript

  Main responsibilities:

  • Maintained RMM - Runbox Mail Manager: a Perl web service with a mix of mod_perl and Catalyst
  • Developed Runbox 7 — an Angular-based webmail utilizing a custom-built canvas table renderer and client-side full text search index

Other notable experience

• OSEC – Open Source Education Center (contractor, since 2015)

  Designed and conducted Python training courses for major Polish companies, at every level.

• Opera Software ASA (full-time, 2012-2015)

  Worked as a Web Developer on MyOpera, Opera Sync and several internal projects.
  Used Perl (Moose, Catalyst), Python (Flask), some C++ and Go

• Google, The Perl Foundation (grant, 2011)

  Participated in Google Summer of Code writing the Pod parser for Rakudo,
  the Perl 6 compiler (now known as Raku).

• Kontekst HR International Group (contract, 2009)

  Performed a website security audit following the discovery of major security vulnerabilities