CV

Łukasz Jan Niemier

Twitter: @hauleth

Poznań University of Technology: Computer Science - no degree - 2012-2015
- Secretary of AKAI - Students' Association of Web Developers

Hauleth.dev - Consultant - 2021+
- Supabase - 2023-current
  - Logflare - logs aggregation service
  - Supavisor - a cloud-native, multi-tenant Postgres connection pooler
- Eiger - 2022-2023
  - Forte.io
    - Implementation of the Interledger protocol for cross-chain transactions
  - Aleo Blockchain
    - Implementation of the GraphQL API for the on-chain data
- Erlang Solutions/Kloeckner GmbH - 2021 - Consultant for Elixir, Ruby, and SQL (PostgreSQL)
  - Substantial query performance optimisations by optimising PostgreSQL indices
Remote Inc. - Senior Backend Engineer - 2020-2021
Kobil GmbH - Erlang/Elixir Developer - 2019-2020
- Maintaining MongoDB driver for Elixir
- Implemented transactions for MongoDB driver in Elixir
AppUnite - Full-stack Developer/DevOps - 2016-2019:
- JaFolders/AlleFolders
  - 2x performance improvement by optimising PostgreSQL usage
  - Reduced geo-queries using PostGIS thanks to better indices and materialised views usage
  - Implementation of the UI and brochure viewer in Vue and SVG
- OneMedical/Helium Health
  - Architectural redesign of application from Rails/MongoDB to Phoenix/PostgreSQL
  - Preparing hybrid deployment with on-premise/in-cloud system
  - Migration of the existing deployments from MongoDB to PostgreSQL
Nukomeet - Full-stack Developer - 2015-2016
Prograils - Junior Developer - 2013

Elixir language:
- Logger reimplementation on top of Erlang's logger module
- mix test --cover CLI output
- Support for NO_COLOR environment variable
- is_struct/1
- Fixing module inspection on case-insensitive file systems
- Support for parsing extra arguments via mix eval and eval command in release
Erlang OTP:
- Support for custom devices in logger_std_h
- Fixing socket module to support broader set of protocols (for example ICMP)
- Support for global metadata in logger
- Support for reconfiguration of logger (needed for better Mix and Rebar3 integration)
- Several fixes to logger and socket modules
- Add support for τ constant in math
Git:
- Add support for Elixir in diff
Ecto:
- Support aggregations over *
- Better error on duplicated schema block
Elixir MongoDB driver
- Support for transactions

https://github.com/hauleth/erlang-systemd - systemd integration for Erlang projects
https://github.com/hauleth/mix_unused - Mix compiler for detecting unused code
https://github.com/open-telemetry/opentelemetry-erlang - maintainer of the Erlang's OpenTelemetry implementation
Vim plugins:
- https://github.com/hauleth/asyncdo.vim - simple asynchronous task runner
- https://github.com/hauleth/sad.vim - search and replace text - faster
- https://gitlab.com/hauleth/qfx.vim - display signs next to QF matches