Serverless Functions on Kubernetes — Which Open-Source Solution Is Right?
A systematic comparison of Knative, OpenWhisk, OpenFaaS, Fission, and Kubeless across nine criteria — and why Fission ultimately comes out ahead.
Not available for work
Hi, I'm Jan.
I build cloud systems.
Fullstack software developer with several years of AWS experience, building cloud applications with Java (Spring Boot, Quarkus), Angular, and Kubernetes. I seek pragmatic solutions rather than perfect theory, take ownership of code quality and architecture, and stay curious — in my homelab just as much as at work.
My Expertise
Technical Arsenal
Tools I rely on day-to-day, and a few I pick up just because they interest me.
Java
Core · Streams · Concurrency
Quarkus
Cloud-native Java
Angular
Frontend Framework
PostgreSQL
Relational Database
AWS
Cloud Infrastructure
Kubernetes
Orchestration · Helm
ArgoCD
GitOps Deployment
AI-Assisted Coding
Copilot · Cursor · Claude Code
Credentials & Certifications
Cloud Practitioner
Amazon Web Services
ACTIVE · 2026
CKAD
Linux Foundation
ACTIVE · 2027
CKA
Linux Foundation
PLANNED
Career Timeline
Professional Journey
My timeline of contributions and growth in the tech industry.
- Technical Lead & Senior Fullstack DeveloperdoubleSlash Net-Business GmbH
Overall technical responsibility for production cloud services on AWS — designing, building, and launching new microservices across frontend and backend, introducing GitOps with ArgoCD, managing escalations for enterprise software used worldwide, and mentoring apprentices, including an internal training series on AI-assisted coding.
- Guest Lecturer — AI-Assisted CodingRavensburg-Weingarten University (RWU)
Software engineering guest lecture on AI-assisted coding — bringing hands-on industry experience with tools like Copilot and Claude Code into the classroom.
- Fullstack Software DeveloperdoubleSlash Net-Business GmbH
Migrated on-premise services to AWS with Docker and Kubernetes, carved microservices out of a monolithic legacy application, and built REST APIs and Angular frontends for international B2B software. Set up automated E2E test suites with Playwright and Cucumber, worked closely with international customers in Scrum, and took on on-call duty and onboarding of new team members.
- Bachelor ThesisdoubleSlash Net-Business GmbH
Designed and built an evaluation framework for systematically comparing serverless platforms on Kubernetes (OpenFaaS, Knative, Fission), and implemented automated software license signing with serverless functions, deployed to the Azure cloud.
- Intern & Working StudentdoubleSlash Net-Business GmbH
Backend feature development with Spring Boot in an agile team — fixing bugs, improving code quality through targeted refactoring, writing unit and integration tests with JUnit and Mockito, and gaining first hands-on experience with Docker and CI/CD.
- B.Sc. Computer ScienceMunich University of Applied Sciences
Computer science degree in Munich — the foundation for everything that followed.
Selected Work
Featured Projects
Things I've shipped — from work projects to weekend experiments.
Portfolio — bremauer.cc
My Website—an Angular web app, Go backend, Vitest, Storybook, and CI quality gates
View ProjectTrackYourStop
Flutter app that tracks public transit departures in real time and keeps you informed with current news.
View ProjectChess
Browser chess game built with Svelte and plain JavaScript — svelte stores, Rollup, and no framework bloat.
View ProjectAvailabilityChecker
Windows tool that watches microphone usage and drives a physical availability lamp — so that meetings can proceed without interruption.
View Projectdotfiles
My Linux setup as code — shell configuration and tooling, versioned and reproducible on any machine.
View ProjectSay hello.
Happy to chat about cloud infrastructure, backend architecture, or whatever is on your mind.
Email me
jan.bremauer@icloud.com
Location
Munich, Germany