LVL 01
Player 1 · Ready

Sebastien
Wouters

Kotlin & Java Developer

Backend engineer building JVM services with Kotlin, Spring and Ktor. Quiet, resilient systems — the kind that hum along and never wake you at 3am.

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Sebastien Wouters in a blue kimono outside a traditional Japanese house
HP ■■■■■■■■□□Class: JVM
Level 02

Skill Tree

KotlinLV 10
JavaLV 9
Spring BootLV 9
KafkaLV 8
KtorLV 7
PostgreSQLLV 7
Inventory: Gradle Docker Kubernetes AWS Redis Micronaut JUnit 5
Level 03

Quest Log

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2022 — NowIn progress

Senior Backend Engineer · Mossbyte

Lead a fleet of Kotlin + Ktor services handling ~40k req/s. Drove an event-sourced rewrite that cut p99 latency by 38% and made on-call boring again.

2019 — 2022Completed

Backend Engineer · Toritron

Built event-driven Java + Kafka pipelines for a payments platform. Owned reconciliation, idempotency, and the quiet correctness nobody notices when it works.

2017 — 2019Completed

Software Engineer · Hinoki Labs

Shipped Spring Boot APIs and stood up the team's first real CI/CD. Where I learned that good infrastructure is mostly patience.