# Łukasz Niemier (@hauleth.dev)

Profile: https://sifa.id/p/hauleth.dev
Headline: Principal Elixir Developer

## About

Principal-level Elixir/Erlang Engineer with 10+ years of experience building distributed cloud-native platforms and high-performance backend services. Contributor to Elixir, Erlang/OTP, and Ecto. Specializing in performance engineering, distributed systems, and fault-tolerant platforms.

\**Areas of expertise**:
Distributed Systems · BEAM/OTP · Performance Engineering · System Architecture ˙ Technical Mentoring

## Experience

- **Ruby Developer at Nukomeet** (2015 – 2016)
- **Senior Elixir Consultant at Logflare** (2023 – 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
- **Senior Elixir Developer at Eiger** (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
- **Senior Erlang Developer at Kobil GmbH** (2019 – 2020)
  Implementation of transactions in MongoDB driver for Elixir
- **Full Stack Engineer at AppUnite** (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
- **Principal Elixir Developer at Supabase** (2023 – 2025)
  \- Lead development of Supabase's Supavisor project which was a backbone of the company offering
  \- Improved performance of the implementation by 60% by careful analysis of application profile
  \- Lead implementation of E2E testing against popular PostgreSQL JavaScript clients
  \- Implemented multi-region deployment to improve system durability by blue/green deployments
  \- Reduced usage of mocks in test suite to improve test performance as well as test volatility, reducing in reduced CI usage and improved development experience
- **Elixir Consultant at DockYard** (2025 – 2025)
  Architectural analysis of client product codebase with preparation of security analysis with detailed report with proposed solutions
- **Elixir Consultant at Erlang Solutions** (2021 – 2021)
  Optimised DB query performance by providing PostgreSQL structure analysis and improving indices usage
- **Senior Elixir Developer at Remote.com** (2020 – 2021)

## Education

- **Poznań University of Technology** — No degree, Computer Science (2012 – 2015)

## Skills

- Elixir
- Erlang
- PostgreSQL
- TCL
- English
- CI/CD
- System Deployment
- Elixir
- Phoenix Framework
- Rust
- Blockchain
- Elixir
- Rust
- Erlang
- PostgreSQL
- Ruby
- Phoenix Framework
- Ruby on Rails
- Software Engineering
- Technical Leadership
- Mentoring
- Databases
- Git
- Electronic Medical Records
- Healthcare
- PaaS
- SaaS
- IaaS
- Terraform
- Nix
- Linux
- NixOS
- Project Management
- MongoDB
- JavaScript
- Vue.js
- Rebar3
- Agile
- Team Collaboration
- Team Collaboration
- Leadership
- BigQuery
- Systems Design
- Information Architecture
- Security Auditing
- Incident Response
- Training & Development

## Volunteering

- Vice Technical Organisator at Pyrkon
- Secretary at AKAI - Akademickie Koło Aplikacji Internetowycch
-  at Elixir Language

## Languages

- Polish (native)
- English (full_professional)
- German (elementary)

## Other profiles

- github: https://github.com/hauleth
- website: https://hauleth.dev
- linkedin: https://linkedin.com/in/niemier
- fediverse: https://fosstodon.org/@hauleth
- twitter: https://x.com/hauleth