{ whoami }

I build the platforms other software stands on — Kubernetes-native, event-driven, multi-tenant systems — and I build agents on top of them. Platform engineer by trade, AI enthusiast.

Based in Grand-Est, France, open to hybrid roles in France, Belgium, and Luxembourg, or remote elsewhere.

Focus

Platform · AI

Stack

Go · TypeScript · Python · Kubernetes

Exp

4+ Years

{ the story }

2022La Capsule — Bruxelles

Bachelor & First commits

Graduated the bachelor programme at La Capsule, repeatedly rated the best coding bootcamp in Europe. The full stack, end to end: TypeScript, React, React Native, Node, MongoDB.

TypeScriptReactReact NativeNode.jsMongoDB
2022–24La Capsule · freelance

Teaching while shipping

Taught web & mobile development to the next cohorts for a year and a half in Lille and remotely. In parallel, built booking platforms for local businesses — nci coiffure and OsteoBook — both still live and serving clients today.

TeachingFreelanceBooking platformsReact
2024–26Université de Lorraine · PLEIADES

Kapps'UL

A Heroku-like, event-driven platform on an on-prem Kubernetes cluster: students deploy apps from a catalog into strictly isolated environments. Custom operators, GitOps reconciliation, gRPC + RabbitMQ microservices, and a bespoke scale-to-zero autoscaler built for thousands of idle environments.

3000+

self-healing environments

2

custom operators & CRDs

2+

years in prod

GoKubernetes OperatorsgRPCRabbitMQGraphQLGitOps
2025iSAQB

Architecture, validated

Passed the CPSA-F — Certified Professional for Software Architecture, Foundation level — while building Kapps'UL. Design decisions backed by method, not just instinct.

CPSA-FSoftware Architecture
2026CNCF · Linux Foundation · freelance

The golden year

All 15 CNCF certifications plus LFCS in six months — Golden Kubestronaut #479 worldwide, #20 in France. Shipped VME & Uniq for the university, started Mantoa, and went deep on Go internals with Ardan Labs.

15 CNCF certsLFCSMantoaGolang mastery

MY
WORK

Kapps'UL — platform home screen
Live — 3000+ users

Built platform

2024–26

Université de Lorraine · PLEIADES

Kapps'UL

A Heroku-like platform on an on-prem Kubernetes cluster: students deploy applications from a catalog into strictly isolated, quota-enforced environments. Event-driven microservices, custom operators extending the Kubernetes API, GitOps reconciliation, and a bespoke scale-to-zero autoscaler keeping thousands of idle environments cheap.

3000+

isolated tenants

2y+

in production

GoKubernetes OperatorsgRPCRabbitMQGraphQLGitOpsOn-prem
VME — screenshot
Live in production

Université de Lorraine

2026

VME

Campus software observability: which software lives on which machine, what teachers actually use, what can be reclaimed — feeding automated park maintenance through Puppet automations.

Software inventoryObservabilityAutomation of software management
Uniq — screenshot
Live in production

Université de Lorraine

2026

Uniq

A unique naming and tracking system for the campus machine park — one canonical identity per computer, from enrollment to retirement.

Asset trackingNaming authorityWeb platform
NCICoiffure — screenshot
Live in production

Freelance — barber shop

2023

NCICoiffure

Booking platform for a barber shop — online appointments, services, gallery. In production and booking real clients since launch.

BookingTypeScriptReact
OsteoBook — screenshot
Live in production

Freelance — osteopath

2024

OsteoBook

Booking platform for an osteopathy practice with the same goal: zero phone tag, clients can book their own appointments. Still live, still used daily.

BookingTypeScriptReact

Apps in production

Mantoa — screenshot
Work in progress — open sourcing soon

Open source at v0

2026 — Work In Progress

Mantoa

Agentic learning coach: feed it a book, course or technical document — it builds the roadmap, runs your daily sessions, tests you and schedules reviews until mastery. Document ingestion, knowledge extraction, LLM orchestration, graph + vector stores.

Agentic AIRAGGraph DBVector searchEvals
ULearn — screenshot

Ancestor of Mantoa

2025

ULearn

Drop a PDF, get mind maps, multi-level quizzes and flashcards. The knowledge-extraction ideas that grew into Mantoa — open source release in preparation.

LLM orchestrationPDF pipelineQuizzes & mindmaps

Agentic AI & Cloud Platform

Onecard — screenshot

React Native

2022

Onecard

QR-code professional networking: share the right card (pro, personal…) for the moment, remember where you met people. Built to make networking stick.

React NativeQRMobileGraduation Project
Hyrox Watcher — screenshot

Dockerized scraper

2025

Hyrox Watcher

Hyrox races sell out in a day and the org never warns you. A tiny dockerized watcher diffs the race list daily and pings us the moment registrations open.

ScrapingDockerCronAlerts

Side quests

Kubernetes watcher at scale — screenshot
Publishing soon

Platform

2026

Kubernetes watcher at scale

How to organize multiple watchers of Kubernetes cluster resources, potentially triggered by more than 3,000 users at once, for a real-time UI without overwhelming the API.

KubernetesReal TimeDistributed Systems

Blog Posts

  • KCNA certification — verified on Credly
  • KCSA certification — verified on Credly
  • CKA certification — verified on Credly
  • CKAD certification — verified on Credly
  • CKS certification — verified on Credly
  • CNPE certification — verified on Credly
  • LFCS certification — verified on Credly
  • ICA certification — verified on Credly
  • CCA certification — verified on Credly
  • PCA certification — verified on Credly
  • CAPA certification — verified on Credly
  • KCA certification — verified on Credly
  • CGOA certification — verified on Credly
  • OTCA certification — verified on Credly
  • CBA certification — verified on Credly
  • CNPA certification — verified on Credly

{ the cncf journey }

GOLDENKUBESTRONAUT

Golden Kubestronaut badge

#479

worldwide

#20

in France

15 + 1

CNCF certs · LFCS

6

months total

{ depth }

The more AI assists us,
the more mastery we owe the craft.

iSAQB CPSA-F badge

iSAQB CPSA-F

Certified Professional for Software Architecture — Foundation

I passed a software architecture certification to validate formally what Kapps'UL demanded daily: trade-off analysis, architecture documentation, quality goals and design under constraints — decisions backed by method, not instinct.

Ardan Labs badge

Ardan Labs — Ultimate Go

Go, at the metal

The more AI assistance we get, the deeper our fundamentals must go. That's why I trained with Ardan Labs, one of the most renowned providers of Go training, on mechanical sympathy and Go internals — the language the cloud is written in.

Mantoa manta-ray mascot reading a bookv0 — work in progress

{ building now }

Mantoa

Most people don't fail to learn because they lack information — they fail because they don't have a system. Mantoa turns any book, course or technical document into a complete learning program: a structured roadmap, guided daily sessions, understanding tests, perfectly-timed reviews, and explanations until mastery.

You provide the effort. The app provides the method. Document ingestion, knowledge extraction, LLM orchestration, graph & vector stores — evolved from ULearn, open source at launch.

Knowledge engineeringRAGAgent evalsAgent observabilityModel-agnosticGraph + vector DBsOpen source at v0

{ convictions }

Opinions on AI-assisted engineering

Hands on the critical parts

I’m fully in favor of AI assistance—with caveats. I use it to move faster across the parts of engineering where speed is useful

Own the harness

I deeply believe in open source. While we wait for self-hosted models to become powerful and fast enough for everyday work

Understanding over velocity

We too often use AI to optimize shipping speed instead of deepening our understanding. Long-running

Available for new challenges

LET'STALK

Platform engineering, cloud-native products, agentic systems — if it needs to scale and stay understandable, I'm in.

© 2026 Joël Vappianitoo much coffee & too much scroll