Samuel Berthe

Software Engineer · Go Open-Sourcer · GenAI Community Leader · Hackathon Organizer

📍 Nantes, France   |   🌐 samuel-berthe.fr   |   📝 Substack   |   🐦 @samuelberthe   |   🦋 @samber.bsky.social   |   💼 LinkedIn

Hi. I'm Samuel. I write Go libraries. It started as a hobby, turned into a side project, and is now my attempt at making open source a full-time job. The jury is still out. The coffee budget is not.

It began the usual way: I needed something at work that didn't exist, built it, and thought "someone else probably needs this too." That pattern never stopped. The most well-known result is lo, a utility library built on Go generics. It's now used in production at companies of all sizes, such as RedHat, VMware, Tencent, Bytedance, Grafana, and many others.

The community around these projects is overwhelmingly kind, sharp, and generous. Yes, even the occasional keyboard warrior ready to die on a typo 🙃. And I'm grateful for every single one of you. 💖

The ecosystem kept growing from there: monads, dependency injection, caching, structured errors, and 35+ log/slog handlers. If your stack uses Terraform, Kubernetes, the Grafana stack, apps you've definitely opened today (if you're Chinese), or a few places you'd rather not think about 😅 #pr0n — there's a fair chance my code is already quietly running somewhere.

On the community side: I started the Generative AI meetup in Nantes (Fr) from scratch: no audience, no budget, no certainty anyone would show up. It became the largest GenAI meetup in France 🇫🇷. I also run hackathons, speak at conferences, and write on Substack.

If your team ships with any of my libraries and you want to help me keep doing this, sponsoring on GitHub goes a long way. No SLA included, but bugs get fixed with genuine enthusiasm.

My lifetime goal? git push --force into a satellite. Just kidding. Well... maybe not entirely.

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The Go Toolkit

Turns out Go generics unlock a lot. I'm still finding out how much.

| Library | What it does |
| ---------------------------------------- | -------------------------------------------------------------- |
| 🔧 lo | Lodash-style helpers for Go: Map, Filter, Reduce, and 90+ more |
| 🌀 mo | Monads for Go: Option, Result, Either, Future |
| ⚙️ do | Dependency injection with generics for Go |
| 🌊 ro | Reactive streams & event-driven programming for Go |

Be aware, 22 letters left for my next Go projects. Plenty of runway. 😂😂😂

At this pace I'll own the entire alphabet before Go drops GOPATH from the docs.

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The Go slog Ecosystem

Go 1.21 introduced log/slog as the standard structured logger. I built 35+ handlers so you only configure slog once and route logs anywhere:

At some point "just one more handler" stopped being a joke. When you have 1, the next 42 come effortlessly.

Core

| Project | Description |
| ---------------------------------------------------------------- | ----------------------------------------------------------------- |
| 🔀 slog-multi | Fanout, pipeline, routing, and failover between multiple handlers |
| 🎨 slog-formatter | Attribute formatting and transformation |
| 🎲 slog-sampling | Log sampling policies to reduce high-volume noise |
| 🃏 slog-mock | Mock handler for unit testing |

HTTP middleware — slog-gin · slog-echo · slog-fiber · slog-chi · slog-http

Monitoring & observability — slog-logstash · slog-syslog · slog-fluentd · slog-loki · slog-datadog · slog-sentry · slog-otel · slog-graylog · slog-quickwit · slog-rollbar · slog-betterstack

Notifications — slog-slack · slog-telegram · slog-webhook · slog-mattermost · slog-microsoft-teams

Messaging & streaming — slog-kafka · slog-nats · slog-channel · slog-parquet

Adapters — slog-zap · slog-zerolog · slog-logrus

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Go Utilities

The stuff that didn't fit anywhere else but was too useful to delete.

| Project | Description |
| ------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------- |
| 💥 oops | Errors with context, stack traces, and structured metadata |
| 🔥 hot | In-memory cache: LRU, LFU, TinyLFU, W-TinyLFU, ARC, 2Q, S3FIFO, SIEVE, FIFO, N-random; TTL, sharding |
| 🕸️ go-mod-graph | Web-based Go module dependency graph visualizer |
| 🐰 go-amqp-pubsub | Resilient pub/sub framework for RabbitMQ, auto-reconnects and binds on network failure |
| 🔁 go-singleflightx | x/sync/singleflight with generics and an extended API |
| 📦 go-batchify | Group and deduplicate concurrent tasks to reduce downstream load |
| 🔤 go-type-to-string | Extract a string representation of any Go type |
| 📏 go-metered-io | Drop-in io.Reader/io.Writer that tracks total bytes transferred |
| 🔌 go-tcp-pool | TCP connection pool with auto-reconnect as a net.Conn drop-in |
| 📊 go-psi | Linux Pressure Stall Information (PSI) reader and starvation notifier |
| 🔍 go-quickwit | Go ingestion client for Quickwit search engine |
| 🛡️ go-safe-csv-writer | encoding/csv fork that prevents CSV injection and data exfiltration |
| 📦 go-pkggodev-client | Typed Go client for the pkg.go.dev API |

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Claude Code / AI Tooling

AI-native tooling built by someone who spends way too much time inside the tool. You know... dopamine...

| Project | Description |
| -------------------------------------------------------------------------------- | -------------------------------------------------------------------------- |
| 🛠️ cc | Claude Code toolchain and marketplace |
| ☕ cc-caffeine | Keep Claude Code alive while commuting, prevents laptop sleep |
| 🧠 cc-skills | Reusable AI agent skills for marketing and engineering |
| 🐹 cc-skills-golang | AI agent skills purpose-built for production Go projects |
| 🤖 go-playground-mcp | MCP server for Go Playground, run and share Go code from your AI assistant |
| 🛡️ the-great-gpt-firewall | Curated list of sites blocking AI crawlers via robots.txt |
| 🔢 tiktoken-cli | Count LLM tokens in files and directories from the terminal |
| 📊 vscode-token-counter | VS Code extension showing live token counts in the status bar |
| 📊 godig | CLI & MCP server for pkg.go.dev - replaces Context7 for Go projects |

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Awesome Collections

Lists of things so you don't have to ChatGPT them at 2am.

| Project | Description |
| -------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| ⚡ awesome-prometheus-alerts | 1.000 production-ready Prometheus alerting rules for 100 services |
| 📊 awesome-olap | Curated list of OLAP databases and analytical query engines |
| 🫟 awesome-user-research | Curated list of tools for Product Managers and UX Researchers |

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Prometheus & Observability

If you can't measure it, you can't get paged on it at 3am.

Alert on everything. Sleep on nothing.

| Project | Description |
| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------- |
| ⚡ awesome-prometheus-alerts | 1.000 production-ready Prometheus alerting rules for 100 services |
| 📊 prometheus-query-js | JavaScript client for the Prometheus HTTP query API |
| 📈 chartjs-plugin-datasource-prometheus | Prometheus datasource plugin for Chart.js |
| 📤 promql-exporter | Prometheus exporter that re-exposes PromQL query results as metrics (replacing federation and remote-write for niche use-cases) |
| 🏓 hyperping-exporter | Prometheus exporter for Hyperping uptime monitoring |
| ☁️ clevercloud-exporter | Prometheus exporter for Clever Cloud infrastructure metrics |

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Tools & Utilities

Random things? Maybe. Useless? Never.

| Project | Description |
| ---------------------------------------------------------------------------- | ---------------------------------------------------------------------------- |
| 📈 oss-kpi | Dashboard to track open-source project KPIs: stars, forks, downloads, and more |
| 🧾 invoice-as-a-service | Generate professional PDF invoices from a single HTTP POST, with S3 upload |
| 📝 headercheck | Linter that checks and fixes required file headers, golangci-lint compatible |
| 🔑 sync-ssh-keys | Sync server ~/.ssh/authorized_keys from GitHub/GitLab org membership |
| 🔀 git-contrib-graph | Git contribution graph rendered in the terminal |

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Writing & Talks

Occasionally I stop writing code long enough to write words about code, with live demo that goes exactly as planned.

Substack - I write about Go, open-source, and software engineering on Substack. Deep dives into performance engineering, library design, and lessons learned from maintaining high-traffic OSS projects.

Talks - Slides and resources from my conference talks and meetup presentations. Topics include generative AI, performance engineering, observability, Golang, and building open-source communities.

Generative AI meetup replays 🇫🇷 - When my camera does not crash in the middle of the talk.

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🚀 Fuel My Work

All those green squares, and yet rent is still

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