IN PROGRESS: AWS Certified (Solutions Architect, Developer, SysOps Administrator, Cloud Practitioner)
2012: KIM van Harte & Lingsma
2005: Java Sun Certified Developer [CX-310-252A]
2004: Java Sun Certified Programmer [CX-310-035]
2002: Sybase System & Database Administration: ASE12.5
2001: Oracle for experienced usage via Vijfhart
Java and open source