My personal blog
hauleth.dev
blog
Update CV to be easier to ingest by ATS
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title = "CV"
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title = "Łukasz Niemier"
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[extra]
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no_comments = true
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sitemap = false
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{{ cv() }}
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**Email:** <lukasz@niemier.pl>
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**Website:** <https://hauleth.dev>
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**GitHub**: <https://github.com/hauleth>
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**Tangled**: <https://tangled.com/@hauleth.dev>
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**StackOverflow**: <https://stackoverflow.com/u/1017941>
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## Technical Skills
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**Languages & Frameworks**: Elixir, Erlang (OTP), Rust, PostgreSQL, Ruby on Rails, Bash, Nix/NixOS
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**Tools & Technologies**: Git, Terraform, Consul, Nomad, Docker, GNU/Linux
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## Notable contributions
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- Elixir - logger reimplementation on top of Erlang's `logger` module, `mix test
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--cover` CLI output, Support for `NO_COLOR` environment variable, add
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`is_struct/1` guard, fix module inspection on case-insensitive file systems,
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support for parsing extra arguments via `mix eval` and `eval` command in
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release
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- Erlang OTP - add support broader set of protocols in `socket` module, support
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for custom devices in `logger_std_h`, support for global metadata in `logger`,
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+
support for reconfiguration of `logger` (needed for better Mix and Rebar3
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integration)
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- Ecto - support aggregations over `*`, better error on duplicated `schema` block
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## Professional Experience
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{% section() %}
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### DockYard - Consultant
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<small>2025</small>
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Architectural analysis of client product codebase with preparation of security
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analysis with detailed report with proposed solutions
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{% end %}
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{% section() %}
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### Supabase Supavisor - Lead Elixir Developer
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<small>2023–2025</small>
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- Optimised metrics gathering system that resulted in an order of
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magnitude performance boost
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- Updated used OTP and Elixir versions from OTP 24 to OTP 27 and Elixir
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from 1.14 to 1.18
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- Reduced usage of mocking in tests to improve tests performance and
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volatility, resulting in reduced CI usage and improved developer
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+
experience
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+
- Implemented e2e tests against existing Node.js PostgreSQL clients to
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improve production issues
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- Implemented multi-region deployment system to provide blue/green
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deployments
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- Replaced usage of `ct_slave` with newer `peer` module in OTP
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{% end %}
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{% section() %}
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### Supabase Logflare - Senior Elixir Developer
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<small>2023</small>
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- Implemented on-the-fly decompression of incoming data that improved
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ingestion possibilities and reduced transfer usage
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- Implemented DataDog-compatible ingestion endpoint for seamless
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transition from DataDog provider to Logflare
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- Improved BigQuery pipeline workflow to reduce congestion on database
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connections
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- Added support for AWS Cloud Events metadata extraction
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- Improved CI usage by splitting different actions to separate steps ran
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in parallel
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- Replaced dynamic generation of connection modules for PostgreSQL
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storage system with Ecto's dynamic repositories to avoid atom exhaustion
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{% end %}
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{% section() %}
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### Eiger - Consultant
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<small>2022–2023</small>
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- **Forte.io** - implemented Interledger protocol for cross-chain transactions
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- **Aleo Blockchain** - implemented GraphQL API for the on-chain data; created
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syntax colouring library for Aleo assembly-like language for smart contracts
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{% end %}
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{% section() %}
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### Erlang Solutions/Kloeckner GmbH - Consultant
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<small>2021</small>
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Optimised DB query performance by providing PostgreSQL structure analysis and
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improving indices usage
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{% end %}
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{% section() %}
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### Remote Inc. - Consultant
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<small>2020–2021</small>
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{% end %}
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{% section() %}
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### Kobil GmbH - Erlang/Elixir Consultant
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<small>2019–2020</small>
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Implementation of transactions in MongoDB driver for Elixir
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{% end %}
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{% section() %}
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### AppUnite - Full-stack Developer/DevOps
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<small>2016–2019</small>
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- **JaFolders/AlleFolders** - 2× performance improvement by optimising
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PostgreSQL usage by reducing geo-queries using PostGIS thanks to better
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indices and materialised views; implemented UI and brochure viewer in Vue and
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SVG
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- **OneMedical/Helium Health** - architectural redesign and reimplementation of
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application from Rails/MongoDB to Phoenix/PostgreSQL; prepared hybrid
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deployment with on-premise/in-cloud system; migrated of the existing
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deployments from MongoDB to PostgreSQL
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{% end %}
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flake.lock
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···
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# Łukasz Jan Niemier
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## Personal information
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Email:
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<~@hauleth.dev>
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Website:
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<https://hauleth.dev>
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Twitter:
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[@hauleth](https://twitter.com/hauleth)
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## Education
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- Poznań University of Technology: Computer Science - no degree - 2012-2015
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+ Secretary of AKAI - Students' Association of Web Developers
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## Experience
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- Hauleth.dev - Consultant - 2021+
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+ DockYard/Karambit.ai - 2025
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* Architectural analysis of Karambit product
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* Prepared security analysis with detailed report with fixes
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+ Eiger - 2022-2023
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* Forte.io
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- Implemented Interledger protocol for cross-chain transactions
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* Aleo Blockchain
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- Implemented GraphQL API for the on-chain data
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- Created syntax colouring library for Aleo assembly-like language
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for smart contracts
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+ Erlang Solutions/Kloeckner GmbH - 2021 - Consultant for Elixir, Ruby,
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and SQL (PostgreSQL)
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* Optimised DB query performance by providing PostgreSQL structure
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analysis and improving indices usage
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+ Remote Inc. - Senior Backend Engineer - 2020-2021
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* Architectural analysis of existing codebase
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+ Kobil GmbH - Erlang/Elixir Developer - 2019-2020
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* Maintained MongoDB driver for Elixir
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* Implemented transactions for MongoDB driver in Elixir
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- Supabase - 2023-2025
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+ Logflare - logs aggregation service:
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* Implemented on-the-fly decompression of incoming data that improved
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-
ingestion possibilities and reduced transfer usage (created library
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-
[`plug_caisson`][] for that purpose)
46
-
* Implemented DataDog-compatible ingestion endpoint for seamless
47
-
transition from DataDog provider to Logflare
48
-
* Improved BigQuery pipeline workflow to reduce congestion on database
49
-
connections
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-
* Added support for AWS Cloud Events metadata extraction
51
-
* Improved CI usage by splitting different actions to separate steps ran
52
-
in parallel
53
-
* Replaced dynamic generation of connection modules for PostgreSQL
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-
storage system with Ecto's dynamic repositories to avoid atom exhaustion
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-
+ Supavisor - a cloud-native, multi-tenant Postgres connection pooler
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-
* Deployment management
57
-
* Optimised metrics gathering system that resulted in an order of
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-
magnitude performance boost
59
-
* Updated used OTP and Elixir versions from OTP 24 to OTP 27 and Elixir
60
-
from 1.14 to 1.18
61
-
* Reduced usage of mocking in tests to improve tests performance and
62
-
volatility, resulting in reduced CI usage and improved developer
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-
experience
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-
* Implemented e2e tests against existing Node.js PostgreSQL clients to
65
-
improve production issues
66
-
* Implemented multi-region deployment system to provide blue/green
67
-
deployments
68
-
* Improved system observability features by making it more resilient and
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-
performant
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* Replaced usage of `ct_slave` with newer `peer` module in OTP
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-
- AppUnite - Full-stack Developer/DevOps - 2016-2019:
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+ JaFolders/AlleFolders
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* 2x performance improvement by optimising PostgreSQL usage
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-
* Reduced geo-queries using PostGIS thanks to better indices and
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-
materialised views usage
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-
* Implemented UI and brochure viewer in Vue and SVG
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-
+ OneMedical/Helium Health
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-
* Architectural redesign of application from Rails/MongoDB to
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Phoenix/PostgreSQL
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* Prepared hybrid deployment with on-premise/in-cloud system
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* Migrated of the existing deployments from MongoDB to PostgreSQL
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- Nukomeet - Full-stack Developer - 2015-2016
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- Prograils - Junior Developer - 2013
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### Organisations
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- Erlang Ecosystem Foundation - member of the Observability WG
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- OpenTelemetry Project - member of the Erlang WG
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### Other fields
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- Volunteer:
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+ Pyrkon Fan Convention
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* Helper - 2011, 2012, 2013, 2014, 2016
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* Organizer - 2015
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+ UEFA Championship 2012 - Poland-Ukraine
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* ICT Accreditation support
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- Times Person of the Year - 2006
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### Languages
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- Polish - mother tongue
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- English - fluent
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### Showcase
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- GitHub: <https://github.com/hauleth>
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- GitLab: <https://gitlab.com/hauleth>
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- SourceHut: <https://sr.ht/~hauleth>
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- StackOverflow: <https://stackoverflow.com/u/1017941>
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### Notable contributions
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- Elixir language:
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+ Logger reimplementation on top of Erlang's `logger` module
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+ `mix test --cover` CLI output
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+ Support for `NO_COLOR` environment variable
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+ `is_struct/1`
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+ Fixing module inspection on case-insensitive file systems
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+ Support for parsing extra arguments via `mix eval` and `eval` command in
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release
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- Erlang OTP:
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+ Support for custom devices in `logger_std_h`
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-
+ Fixing `socket` module to support broader set of protocols (for example
125
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ICMP)
126
-
+ Support for global metadata in `logger`
127
-
+ Support for reconfiguration of `logger` (needed for better Mix and Rebar3
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-
integration)
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+ Several fixes to `logger` and `socket` modules
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+ Add support for τ constant in `math`
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- Git:
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+ Add support for Elixir in diff
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- Ecto:
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+ Support aggregations over `*`
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+ Better error on duplicated `schema` block
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- Elixir MongoDB driver
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+ Support for transactions
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### Notable projects
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- <https://github.com/hauleth/erlang-systemd> - systemd integration for Erlang
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projects
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- <https://github.com/hauleth/mix_unused> - Mix compiler for detecting unused
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code
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- <https://github.com/open-telemetry/opentelemetry-erlang> - maintainer of
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the Erlang's OpenTelemetry implementation
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- Vim plugins:
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+ <https://github.com/hauleth/asyncdo.vim> - simple asynchronous task runner
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+ <https://github.com/hauleth/sad.vim> - search and replace text - faster
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+ <https://gitlab.com/hauleth/qfx.vim> - display signs next to QF matches
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### Languages and Frameworks
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- Elixir
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+ Phoenix
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+ Ecto
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- Erlang
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+ OpenTelemetry collaborator
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+ EEF Member
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+ OTP contributor
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- Nix/NixOS
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- Rust
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- PostgreSQL
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- sh/Bash
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- Ruby
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+ Ruby on Rails
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### Technologies
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- Git
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- Vim
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- HashiStack
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+ Terraform
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+ Consul
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+ Nomad
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- GNU/Linux and other UNIX-like systems
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- TDD/BDD methodologies
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- Property testing
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## Other
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- Viking reenactor
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- Keyboard fan
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- Sci-fi/Fantasy fan and Poznań's Sci-fi/Fantasy club member
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[`plug_caisson`]: https://github.com/supabase/plug_caisson