Technology: Kotlin

Modern, concise JVM language that is fully interoperable with Java. First-class choice for Android and Spring Boot backends.

Albert Heijn – Kotlin developer
Since March 2026 I have been working as a freelance senior Kotlin developer at Albert Heijn (Zaandam) on the Gambit platform. The work involves hands-on Kotlin development with heavy use of GraphQL, Spring, and AI integrations.

What I work on
- Kotlin development on the Gambit platform
- Spring Boot and GraphQL
- AI integrations
June 5, 2026
ABN AMRO – Java tech lead
From mid-2024 to early 2026 I worked as a freelance Java backend tech lead at ABN AMRO (Amsterdam area), leading backend development on Azure infrastructure.

What I worked on
- Java backend development and technical leadership
- Spring Boot on Azure cloud infrastructure
March 1, 2026
bol.com – Kotlin & React developer
Between 2022 and 2024 I worked at bol.com (Utrecht) as a freelance Kotlin backend developer, first on a data migration project and later on platform services.

Data migration (2022 – 2023)
- Kotlin backend development for a large-scale data migration
- Spring Boot, PostgreSQL, MS-SQL, Google Cloud, Kubernetes
Platform services (2023 – 2024)
- Kotlin backend development with Spring Boot
- Google Cloud: Pub/Sub, Cloud Storage, BigQuery
- Kubernetes, PostgreSQL
June 1, 2024
Ahold Delhaize – Java/Kotlin TechLead
From 2017 to 2022 I worked as a Java/Kotlin tech lead at Ahold Nederland (Zaandam), leading backend development on a Kubernetes and Docker infrastructure with Spring Boot at its core.

What I worked on
- Java/Kotlin backend services on Kubernetes and Docker
- Quarkus with MicroProfile as a Spring Boot alternative
- Azure: Data Lake, Storage, Databricks, Kubernetes, Event Hub, Stream Analytics
- Event streaming with Kafka, Avro, and Schema Registry
- Frontend work in React, Redux, Axios, TypeScript, Bootstrap
- Python, Scala, Groovy, Bash, and SQL tooling
- Flutter mobile development
January 1, 2022