Oliver Lehmann

Professional experience for Oliver Lehmann

• Current 1 year, since Oct 2022

  Software Developer

  Gothaer Konzern

• 1 year and 10 months, Dec 2020 - Sep 2022

  Solution Architect

  REWE Systems GmbH

  Designing solution architectures and advising the dev team on how to transform 20-40 year old monolithic applications like a central subsidiary ledger into a microservice or "modulith" architecture. Also considering aspects like reasonability, cost efficiency as well as "make or buy". Strongly focussing on asynchronous streaming solutions for application interaction instead of synchronous online (web-)services or the currently predominant database integration solutions.

• 7 years and 8 months, Apr 2013 - Nov 2020

  Senior Software Engineer & Software Architect

  REWE Systems GmbH

  Domain-Driven-Design, System Architecture, Review, Performance Tuning and Development of RESTful multi-layer Services for the REWE Merchandise System in Java using Spring Boot, RESTEasy, Jackson, MapR, MyBatis, Infinispan, Guava, DB2. Long term (5+ years) project: reimplementation of the legacy monolithic merchandise system by using the above stated mindset, tools and frameworks.

• 7 years and 6 months, Oct 2005 - Mar 2013

  Senior Software Engineer

  METRO SYSTEMS GmbH

  2011-2013: Mobile Store Merchandise System on a Handheld, Technologies: Java/Spring, Tasks: Functional+Technical Specification, Development // 2005-2013: Store Merchandise and Logistic System, Technologies: Oracle PL/SQL, Forms, Reports, Tasks: System Architecture&Integration, Functional + Technical Specification, Development, Code Review, Performance Tuning, International Rollout, Project Coordination

• 2 years and 9 months, Jan 2003 - Sep 2005

  Application Engineer

  METRO SYSTEMS GmbH

  Implementation of a Job Scheduling for batch processing using the Tivoli Workload Scheduler for an inhouse developed and international used centralized Oracle based Merchandise Management System.

• 1 year and 10 months, Feb 2001 - Nov 2002

  Developer / System Administrator

  brainwire GmbH

  Development Community Solutions (PHP, MySQL) + System Administration (Linux)

• 3 years and 6 months, Aug 1997 - Jan 2001

  Apprentice

  BASF Schwarzheide GmbH