- Analysis, refinement and estimation of complex functional and technical requirements
- New development and evolution of backend services with Java / Spring Boot, following architecture and quality guidelines
- DevOps: CI/CD pipelines with AWS CodeBuild & CodePipeline (YAML + CDK Java), Bamboo; cloud infrastructure on AWS (Lambda, RDS, S3, CloudWatch, EC2)
- Solution design, effort estimation and technical planning
- Cross-team technical alignment with stakeholders and dependent teams
- Code quality through tests and reviews · 3rd-level support for production systems
- Onboarding and mentoring of junior and mid-level engineers
~ /usame · zsh
$ whoami
- name
- üsame turhan
- role
- senior backend engineer (java / spring)
- based
- vienna, austria 🇦🇹
- work model
- hybrid (vienna) · remote (elsewhere)
- experience
- 10+ years
- edu
- tu wien
- languages
- german, english, turkish
Senior software engineer with 10+ years of experience in Java backend development. I work at the intersection of technical implementation, architecture and requirements analysis — delivering features end-to-end in complex enterprise environments.
Beyond hands-on development I regularly own solution design, effort estimation, cross-team technical alignment and 3rd-level production support. I also mentor junior and mid-level engineers.
where i operate
- technical implementation (full ownership)
- architecture & solution design
- requirements analysis & refinement
- devops — pipelines, cloud infrastructure (AWS)
what i regularly own
- solution concepts & technical specs
- effort estimation & sprint planning
- cross-team technical coordination
- 3rd-level support for production systems
- mentoring junior & mid-level engineers
$ cat value.md
I help companies to:
- build complex backend systems that stay stable and scalable — even at 500k+ users
- turn technical and functional requirements into working software efficiently, from refinement to deployment
- evolve and migrate existing systems without unnecessary rewrites
- establish DevOps practices — automated pipelines, cloud infrastructure as code
- raise the quality bar through clean code, testing and thorough code review
$ cat stack.txt
backend
Java 17–25Spring Boot 3 / 4
Spring FrameworkJakarta EE
Java EE 7REST APIs
Microservices
data
PostgreSQLMySQLSQL
JPA / HibernateMongoDB
cloud & devops
AWS CDK (Java)CodeBuild
CodePipelineLambda
RDSS3
CloudWatchEC2
DockerGitHub Actions
BambooJenkinsMaven
auth
OIDC / OAuth2IBM ISAM
testing
JUnitMockito
Test Automation
reporting
Apache POIEclipse BIRT
PDF generation
practices
Clean CodeDesign Patterns
UMLAgile / Scrum
Requirements EngineeringIaC
tools
IntelliJ IDEAEclipseAWS Console
$ ls experience/ --long --reverse
- Java EE 7: developed a fleet card billing system for major oil companies — Eclipse BIRT report transformations, PDF generation, batch processing
- Built a power plant project costing & calculation tool for a major energy company — full lifecycle from offer phase to warranty handover, component-level breakdown (Apache POI, complex Excel import/export with named ranges & VBA templates, PDF exports · Fabasoft Folio)
- Built and owned the CI/CD and development infrastructure for the entire department — automated build, restore, install and test pipelines, distributed test agent deployment
- Designed and delivered a one-week test automation training for new and volunteer colleagues; test architecture review over an extended period
- Release management & customer deployment liaison — assembled release packages and coordinated on-site deployments with customer devops teams (direct infra access not permitted — compliance)
- Requirements engineering · onboarding and mentoring of new engineers
$ ls projects/ --highlights
01 Global Dealer Access Portal Porsche Informatik · 2021 – present
- Centralized web portal for a global automotive group's dealer ecosystem — 500,000+ users (importers, direct dealers, workshops, third parties) across all brands and markets worldwide
- Unified access to sales and after-sales applications, replacing separate brand-specific dealer portals; backend: SSO, user management, role management, application access control
- OIDC integration against existing IBM ISAM infrastructure
- AWS infrastructure: CodeBuild, CodePipeline, Lambda, RDS, S3, CloudWatch, EC2 · IaC via AWS CDK (Java)
- Team of 6 (1 BE tech lead, 1 FE lead, 1 senior FE, 1 senior BE, 2 junior/mid) · my role: senior backend developer
02 Org Structure Platform — Legacy Migration Porsche Informatik · ongoing
- Migration of a core legacy system that feeds organisational hierarchy data into the main dealer access portal (Project 01)
- Full hierarchy: group management → brands → regions → dealerships → workshops — all brands, all global markets
- Replacement architecture designed for reliability, extensibility and clean data contracts
03 Power Plant Project Costing Tool DXC · 2015 – 2021
- Costing and calculation system for large-scale power plant projects at a major energy company — full lifecycle from offer phase to warranty handover
- Full component breakdown (right down to individual parts); engineers adjust parameters in the offer phase to meet tender requirements, with structured sign-off workflows
- Complex Apache POI Excel import/export (named ranges, VBA code templates, multi-sheet workbooks), PDF report exports
04 Fleet Card Billing System DXC · Java EE 7
- Billing and invoice processing for major oil company fleet cards — Eclipse BIRT report transformations, PDF generation, batch processing
- Java EE 7 development including full test coverage and CI/CD integration
$ cat workstyle.md
core strengths
- backend architecture — from greenfield design to legacy migration
- requirements analysis & technical refinement
- complex integrations (OIDC, ISAM, legacy systems, third-party APIs)
- performance optimization & database tuning
- error analysis, debugging, 3rd-level support
- devops — cloud pipelines, infrastructure as code (AWS CDK)
how i work
- structured and solution-oriented — I clarify requirements before touching code
- quality and sustainability over quick fixes
- pragmatic about technical decisions — no over-engineering
- clear communication on risks, estimates and deviations
- I own my work end-to-end: from ticket to production
$ cat edu.txt
M.Sc. Software Engineering & Internet Computing — TU Wien
B.Sc. Software & Information Engineering — TU Wien
$ contact --help