Łukasz Niemier

Email: lukasz@niemier.pl
Website: https://hauleth.dev

GitHub: https://github.com/hauleth
Tangled: https://tangled.com/@hauleth.dev
StackOverflow: https://stackoverflow.com/u/1017941

Technical Skills

Languages & Frameworks: Elixir, Erlang (OTP), Rust, PostgreSQL, Ruby on Rails, Bash, Nix/NixOS
Tools & Technologies: Git, Terraform, Consul, Nomad, Docker, GNU/Linux

Notable contributions

  • Elixir - logger reimplementation on top of Erlang's logger module, mix test --cover CLI output, Support for NO_COLOR environment variable, add is_struct/1 guard, fix module inspection on case-insensitive file systems, support for parsing extra arguments via mix eval and eval command in release
  • Erlang OTP - add support broader set of protocols in socket module, support for custom devices in logger_std_h, support for global metadata in logger, support for reconfiguration of logger (needed for better Mix and Rebar3 integration)
  • Ecto - support aggregations over *, better error on duplicated schema block

Professional Experience

DockYard - Consultant

2025

Architectural analysis of client product codebase with preparation of security analysis with detailed report with proposed solutions

Supabase Supavisor - Lead Elixir Developer

2023–2025

  • Optimised metrics gathering system that resulted in an order of magnitude performance boost
  • Updated used OTP and Elixir versions from OTP 24 to OTP 27 and Elixir from 1.14 to 1.18
  • Reduced usage of mocking in tests to improve tests performance and volatility, resulting in reduced CI usage and improved developer experience
  • Implemented e2e tests against existing Node.js PostgreSQL clients to improve production issues
  • Implemented multi-region deployment system to provide blue/green deployments
  • Replaced usage of ct_slave with newer peer module in OTP

Supabase Logflare - Senior Elixir Developer

2023

  • Implemented on-the-fly decompression of incoming data that improved ingestion possibilities and reduced transfer usage
  • Implemented DataDog-compatible ingestion endpoint for seamless transition from DataDog provider to Logflare
  • Improved BigQuery pipeline workflow to reduce congestion on database connections
  • Added support for AWS Cloud Events metadata extraction
  • Improved CI usage by splitting different actions to separate steps ran in parallel
  • Replaced dynamic generation of connection modules for PostgreSQL storage system with Ecto's dynamic repositories to avoid atom exhaustion

Eiger - Consultant

2022–2023

  • Forte.io - implemented Interledger protocol for cross-chain transactions
  • Aleo Blockchain - implemented GraphQL API for the on-chain data; created syntax colouring library for Aleo assembly-like language for smart contracts

Erlang Solutions/Kloeckner GmbH - Consultant

2021

Optimised DB query performance by providing PostgreSQL structure analysis and improving indices usage

Remote Inc. - Consultant

2020–2021

Kobil GmbH - Erlang/Elixir Consultant

2019–2020

Implementation of transactions in MongoDB driver for Elixir

AppUnite - Full-stack Developer/DevOps

2016–2019

  • JaFolders/AlleFolders - 2× performance improvement by optimising PostgreSQL usage by reducing geo-queries using PostGIS thanks to better indices and materialised views; implemented UI and brochure viewer in Vue and SVG
  • OneMedical/Helium Health - architectural redesign and reimplementation of application from Rails/MongoDB to Phoenix/PostgreSQL; prepared hybrid deployment with on-premise/in-cloud system; migrated of the existing deployments from MongoDB to PostgreSQL