Łukasz Niemier

Summary

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

Technical Skills

Core Technologies: Elixir, Erlang/OTP, Phoenix, Ecto, PostgreSQL
Additional Experience: Rust, Terraform, Nomad, Consul, Docker, Nix/NixOS

Open Source & Ecosystem Contributions

Recognized contributor to the BEAM ecosystem through open-source development, conference speaking, and standards working groups.

• Contributor to Elixir core
• Contributor to Erlang/OTP
• Contributor to Ecto
• Changes accepted across logging, networking, tooling, and language features
• Member of Erlang Ecosystem Foundation Observability Working Group
• Member of OpenTelemetry Erlang Working Group
• Member of the Year on Elixir Forum in years 2019–2025

Hauleth.dev - Owner

Nov 2016 - Present

• Publish technical articles on Elixir, Erlang, Rust, distributed systems, and culture
• Develop and maintain open-source projects used by the BEAM community
• Deliver conference talks and participate in ecosystem working groups

DockYard - Elixir Consultant

Nov 2025 – Dec 2025

• Performed architecture and security review of a large Elixir codebase
• Delivered a detailed report with recommendations covering architecture, scalability, fault tolerance and security

Supabase - Lead Elixir Developer

Nov 2023 – Jun 2025

• Redesigned metrics gathering architecture resulting in 10× throughput improvement and lower infrastructure costs
• Upgraded production platform from OTP 24 to OTP 27 and Elixir 1.14 to 1.18
• Simplified test architecture, reducing CI resource usage while improving reliability and developer experience
• Implemented e2e tests against existing 3rd-party PostgreSQL clients to improve platform reliability for external clients
• Led design and implementation of multi-region deployment strategy improving platform fault tolerance and availability
• Mentored engineers in Erlang/OTP profiling and performance analysis of production systems

Supabase - Senior Elixir Consultant

Mar 2023 – Nov 2023

• Implemented on-the-fly decompression of incoming data that improved ingestion possibilities and reduced transfer usage by up to 50%
• Implemented DataDog-compatible ingestion endpoint for seamless transition from DataDog to Logflare
• Reduced BigQuery congestion by 10% by architectural redesign of existing pipelines
• Added support for AWS Cloud Events metadata extraction
• Improved CI utilisation by 35% thanks to 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 prevent DoS attack via atom exhaustion
• Maintained Rust NIF bindings to pg_query SQL parser library

Eiger - Consultant

Aug 2022 – Feb 2023

• Implemented Interledger protocol for cross-chain financial transactions
• Implemented Elixir FFI bindings to Rust library Zcash
• Led implementation of GraphQL APIs for blockchain data platforms
• Led small engineering team and delivered developer tooling for smart contract ecosystems

Erlang Solutions/Kloeckner GmbH - Consultant

Apr 2021 – Dec 2021

• Optimised database query performance by 15% via PostgreSQL structure analysis and improved indices usage
• Prepared company-wide learning materials for PostgreSQL utilisation and configuration. Mentored team about their SQL queries writing skills

Remote.com - Elixir Developer

Oct 2020 – Apr 2021

• Refactored and fixed multi-currency handling logic within the payment processing subsystem, improving correctness and maintainability of currency conversion code paths

Kobil GmbH - Erlang/Elixir Developer

Mar 2019 – Sep 2020

• Created Hex-compatible package registry for serving internal packages together with HexDocs-compatible documentation viewer
• Migrated build system from Rebar3 to Mix to improve integration with Elixir dependencies
• Implemented support for transactions in MongoDB driver for Elixir
• Maintenance of open-source MongoDB driver

AppUnite - Full-stack Developer/DevOps

Nov 2016 – Mar 2019

• 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
• 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
• Implemented service to decode Dutch and Belgian postal codes to approximate geographical locations

Nukomeet - Ruby Developer

Apr 2015 – Nov 2016

• Maintain and expand conference management and ticketing system for conferences organised by the company

Selected Projects

• Ultravisor (Elixir and Rust) — Ultravisor is a scalable, cloud-native Postgres connection pooler. An Ultravisor cluster is capable of proxying millions of Postgres end-client connections into a stateful pool of native Postgres database connections
• e9p (Erlang) — Implementation of 9p filesystem protocol in pure Erlang
• erlang-systemd (Erlang) — Integration library between Erlang applications and systemd service descriptions
• mix_unused (Elixir) — Mix task and compiler hook that locates unused public functions in your Elixir projects.
• dolores (Rust) - local development proxy with local TLS certificate generation and dynamic project registration