Krzysztof Sarna
Middleware engineer with 25 years in banking, telecoms and insurance. Administers and migrates Oracle WebLogic and IBM WebSphere environments at T-Mobile, PZU, Orange and BASF. WLS/WAS trainer and Java EE consultant — answers in person, not through a call centre.
25 years on the production front line
In the IT industry for over 25 years — across banking, telecoms and insurance. Specialises in middleware and systems integration on Java Enterprise Edition application servers.
He started at a UK brokerage house, where he co-built Poland's WoodStock Online Brokerage. He moved into telecoms, building applications on BEA WebLogic Server. Five years in banking on IBM WebSphere, then back to telecoms — managing Oracle WebLogic and IBM WebSphere systems. In insurance he maintained Oracle SOA Suite 11g and led the migration to 12c. Today he combines the role of FlexNet's CEO with work as a middleware trainer and IT consultant.
Experience
- 25+ yrsIT industry — banking, telecoms, insurance
- 22 yrsApplication servers — Oracle WebLogic & IBM WebSphere
- 17 yrsOracle WebLogic Server 6–14c
- 17 yrsIBM WebSphere 5–9, Portal 5–6, MQ 5–6, IHS
- 24 yrsApache / Tomcat / JBOSS, UNIX / Windows
- 1 yrOracle SOA Suite 11g → 12c (migration)
Skills
Additional training: RH135 Red Hat System Administration II · From Zero to Hero with AWS (InfoShare Academy, 2022) · Kubernetes in practice (Sages, 2021) · ITIL.
Certificates
Consultation, audit, support
Tell us what you're facing. Your choices in the form build a brief — exactly what the engineer who replies will see.
- we take over systems from other vendors
- we support older WebLogic and WebSphere
- urgent issue? quick diagnosis first
Tell us about it
Your data is safe. It will be used only to handle your request. More info in our privacy policy.