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

Open Source & Ecosystem Contributions

• 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
• Speaker at CodeBEAM V America - Who supervises supervisors?
• Speaker at ElixirConf EU 2022 - "config.exs is simple" and Other Lies
• Guest at Thinking Elixir Episode 149 - Elixir's Unified Logger
• Member of the Year on Elixir Forum in years 2019–2025

DockYard - Consultant

2025

• Architectural analysis of client product codebase with preparation of system analysis with detailed report
• Proposed several improvements in areas of security, architecture design, fault tolerance, and scalability

Supabase - Lead Elixir Developer

2023–2025

• Redesigned metrics gathering architecture resulting in 10× throughput improvement and lower infrastructure costs
• 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 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 team about Erlang and Elixir profiling tooling and performance analysis for hot code paths

Logflare - Senior Elixir Developer

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

Eiger - Consultant

2022–2023

• Implemented Interledger protocol for cross-chain financial transactions
• 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

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.

Kobil GmbH - Erlang/Elixir Consultant

2019–2020

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

AppUnite - Full-stack Developer/DevOps

2016–2019

• 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