Hi, I'm Nico 👋

Based in Berlin. I started as a backend developer, moved into cloud & kubernetes and now I like building the infrastructure that others build on. Most of my work happens in private gitlab repos and my github mainly reflects contributions to OSS projects.

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Open Source Contributions

Kubernetes & Cloud Native

klaudworks/kubeconfig-operator (creator) Kubernetes operator that creates and manages permission-restricted kubeconfigs	crossplane-contrib/provider-http Crossplane Provider for HTTP requests as resources
	2 PRs, 2 issues PRs: Add MissingFieldStrategy for KeyInjection fix flaky test by guaranteeing execution order Issues: Creation of resource is not skipped if resource already exists Replacing sensitive values doesn't work in certain cases
argoproj/argo-cd Declarative GitOps CD for Kubernetes	open-telemetry/opentelemetry-helm-charts OpenTelemetry Helm Charts
2 issues Issues: Faulty unrelated conversion webhook brings argocd to a halt ServerSideDiff not detecting diff in manifests	3 PRs, 1 issue PRs: Simplify dependency propagation Fix resolution of dependent environment variable Fix email service address Issues: Checkout service can't access email service
kubernetes-sigs/kubebuilder SDK for building Kubernetes APIs	cloudnative-pg/plugin-barman-cloud Barman Cloud plugin for CloudNativePG
1 issue Issues: Helm ServiceAccount scaffolding NIL pointers	2 issues Issues: Backups are not restorable on low-activity databases due to missing final WAL segment Restore breaks when increasing wal.maxParallel to 8
giantswarm/etcd-backup-operator Creates etcd backups and uploads them to AWS S3	kutespaces/argocd (creator) Preconfigured learning environment for GitOps with Kubernetes & Argo CD
1 PR PRs: add support for s3 compatible storages
kutespaces/strimzi-kafka-operator (creator) Preconfigured Strimzi Kafka environment for Kubernetes	kutespaces/kubernetes (creator) Fully preconfigured learning environment for Kubernetes

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Data & Stream Processing

gaul/s3proxy Access other storage backends via the S3 API	KafScale/platform (maintainer) Kafka-compatible data streaming on S3
9 PRs, 5 issues PRs: Implement multipart upload for azureblob-sdk provider Implement atomic conditional puts for azureblob-sdk Add If-Match and If-None-Match support for PutObject operations Add OpenTelemetry Prometheus metrics with configurable port/host Fix server-side copy with Managed Identity in AzureBlobStore Fix azureblob multipart upload regression Update tests for multipart upload azureblob-sdk (s3-tests) Skip delimiter prefix tests on s3proxy localstack (s3-tests) Enable ifmatch and ifnonematch tests (s3-tests) Issues: Feature: Metrics for S3 operations ListObjectsV2 start-after fails on azureblob-sdk backend azureblob-sdk provider does not work with aws-sdk-java-v2 < 2.35 Release 2.8.0 Autoprocessor fails when using Java 24	11 PRs, 8 issues PRs: cleanup / bugfix: replace hand-rolled Kafka wire protocol with franz-go's kmsg fix: move produce tagged fields inside partition loop feat: fetch partition routing and on-demand metadata refresh fix: route group coordination requests to a single broker to prevent split brain fix: prevent duplicate offset assignment with etcd lease-based partition ownership cleanup: remove minio defaults from broker, pass through operator env vars fix: don't block all partitions while one is initializing fix: arm64 images contain amd64 binaries due to hardcoded TARGETARCH default fix: handle orphaned S3 segments gracefully in RestoreFromS3 and Read perf: S3 concurrency semaphore and lock-free flush uploads perf: parallelize S3 segment and index uploads Issues: bug: produce request encoding breaks with multiple partitions per topic bug: proxy hangs on acks=0 produce requests bug: consumer groups with more than 1 consumer leads to GroupCoordinator split brain bug: two brokers writing to the same partition can produce overlapping offsets perf: reduce e2e produce + fetch latency on AWS to < 100ms perf: parallelize S3 .index + .kfs downloads in processors Handle orphaned and corrupt segments gracefully in RestoreFromS3 parallelize S3 uploads for .index and .kfs
dbs-leipzig/gradoop Distributed temporal graph analytics on Apache Flink with pattern matching and graph mining	lensesio/stream-reactor Collection of open source Kafka Connect connectors for S3, Cassandra, Elasticsearch, MongoDB and more
6 PRs, 5 issues PRs: [#551] csv graph collection import and export [#966] Reduce createMetaData() bloating [#973] remove semicolon from ascii gdl graph [#876] added print for logical graph and graph collection [#877] added support for property value null [#881] Fix runtime error empty edge set Issues: Rename log4j-test.properties Fix bloated test output Improve DataSource getLogicalGraph() ExclusionTest testReduceCollection() token recognition error GraphCollectionsFactory.fromTransaction() null pointer exception	2 PRs PRs: fix(cloud-sink): widen int8/int16 values for Avro int Fix connect.s3.vhost.bucket inverted semantics

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AWS

awslabs/cdk-eks-blueprints AWS CDK EKS Blueprints	cloudtools/troposphere Python library to create AWS CloudFormation descriptions
1 PR PRs: Add zone id filter using external args	1 PR PRs: Support for OpenApiVersion in serverless.Api
canida-software/k8s-on-aws (creator) Accompanies a series of blogposts about Kubernetes on AWS	canida-software/terraform-ecs-fargate-spot-quickstart (creator) Quickstart to set up applications on AWS ECS with Fargate Spot using Terraform

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AI & LLM Tooling

klaudworks/universal-skills (creator) MCP server that brings Claude Code's skills feature to any AI coding agent	skills-directory/skill-codex (creator) A Claude Code skill to delegate prompts to Codex
BerriAI/litellm Python SDK & Proxy Server to call 100+ LLM APIs	apache/flink-agents Agentic AI framework based on Apache Flink
1 PR, 1 issue PRs: fix: stop leaking x-litellm-api-key to Anthropic + support OAuth tokens in passthrough Issues: LiteLLM Proxy to Transcription Model Fails	1 PR, 1 issue PRs: [Bugfix] Use Thread Context ClassLoader for user class loading Issues: ClassNotFoundException when loading user-defined resource classes from uploaded JARs
klaudworks/ralph-meets-rex (creator) CLI tool that orchestrates multi-step AI coding workflows

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Developer Tools & Other

Beingpax/VoiceInk Voice-to-text app for macOS with near-instant local transcription and screen context awareness	zereight/gitlab-mcp Model Context Protocol server for GitLab, enabling AI agents to interact with GitLab APIs
1 PR, 2 issues PRs: Fix OCR capturing VoiceInk status overlay instead of frontmost app window Issues: Date and execution time flipped for history request Screen content not detected	1 PR PRs: Pin zod-to-json-schema to 3.24.5
hasura/graphql-engine Instant realtime GraphQL APIs on Postgres, SQL Server, BigQuery and MongoDB with fine grained access control
1 issue Issues: Remote Schema Permissions Default Value Null leads to Validation Error