Michal Budzyn
Senior Golang Engineer
Experience
May 2024 - Nov 2024
7 months Germany
Senior Golang Engineer
IONOS / United Internet
- Decoupling managed Kubernetes from the IONOS Cloud API.
- Developing new APIs for Kubernetes cluster and node pool management, adhering to IONOS Cloud API Guidelines.
- Implementing features for cluster management, node pool management and node management.
- Integration with IAM for enhanced security, maintaining comprehensive documentation, and ensuring optimized API response times.
- Golang
- Java
- Kubernetes
- CI/CD
- GitHub Enterprise
- GitHub Actions
- Swagger/OpenAPI v3
- REST API
- API development
- Cloud infrastructure
- Postgres
- pgx
- gRPC
- EDA and hexagonal architecture concepts
- NATS / JetStream
- Contribution to the kubernetes-sigs/controller-tools
- Testcontainers
Jan 2021 - Mar 2024
2 years 3 months Germany
Senior Backend Developer
German Edge Cloud
- Implementation of the operation center core components – Multi-Cloud management and orchestration tools, code generators, development of a VPNaaS solution – Kubernetes operators.
- Evaluation of LXD for the edge, POC for cloud native edge based on metal3.
- Development of modules for platform provisioning system for bare-metal and hybrid-cloud components based on actor model.
- Technical solution design.
- Development of a central edge proxy using REST over Websocket for services running in restricted environment and reverse HTTP proxy over QUIC protocol.
- Kotlin
- Golang
- Java
- Spring Boot
- OpenStack
- AWS
- Terraform
- GitLab
- CI/CD pipelines
- Kubernetes
- k3s
- k3d
- Docker
- Helm
- Helmfile
- Kubebuilder
- Postgres
- Bolt DB
- REST
- JWT
- WebSockets
- gRPC
- Gin-gonic
- Microservices
- GORM
- Temporal.io
- Prometheus
- Terraform Plugin Framework
- Earthly
- Packer
- OpenVPN
- RSA
- TLS
- CRL
- Carvel tools
- (LXC,LXD, OVN basics)
- Node.js/Typescript
- Jest
- GCP K8S Config Connector
- Azure Service Operator
- Canonical Juju
- Hybrid-Cloud
- Metal3
- Kubernetes ClusterAPI / CAPI
- mTLS
- L4/L7 load balancing
- DevOps
Oct 2021 - Nov 2021
2 months Germany
Senior Golang Developer
Applike Group / Adjoe
- Refactoring and performance improvements in the area of Adjoe backend services.
- Golang
- High traffic
- AWS
- SQS
- SNS
- ECS
- GitLab
- Terraform
- Docker compose
- Gin-gonic
- Ginkgo
- Gomock
- pprof
- Postman
- RESTful services
- Microservices
Apr 2021 - Sep 2021
6 months Germany
Senior Golang Developer
Kubermatic / SAP
- Kyma project - development of the Kubernetes service platform.
- Golang
- Kubernetes
- Istio
- Helm
- CRD controllers
- X.509
- mTLS
- Hyperscalers
- GCP
- Azure
Nov 2020 - Apr 2021
6 months Germany
Kotlin / Java Developer
Metronom GmbH
- Development of microservices for METRO Companion App.
- Kotlin
- Java
- Spring Boot
- GCP
- Kubernetes
- BigQuery
- Swagger/OpenAPI
- OAuth2
- OpenID Connect
- JWT
- Jenkins
- Gradle
- Git
- GitLab
- GitHub
- Datadog
- Postgres
- RabbitMQ
- Webflux
- Microservices
Jul 2020 - Sep 2020
3 months Neu-Isenburg, Germany
Senior Java Backend Developer
Lufthansa Airplus Servicekarten
- Development of microservices for secure communication between Mobile App and virtual credit card management system.
- Java
- Spring Boot
- Spring Cloud
- Microsoft Azure
- Azure Kubernetes Service (AKS)
- Docker
- Helm
- Jenkins
- SQL Server
- Apache Kafka
- Git
- PCI compliance
- Vavr-io
- OAuth2
- OpenID Connect
- Keycloak
- JOSE
- JWT
- JWE
- RSA
- JPA
- Hibernate
- Swagger/OpenAPI
- Kotlin
- Microservices
May 2019 - Dec 2020
8 months Düsseldorf, Germany
Golang Developer
Live Reply
- Development of A4 POD Access Orchestrator / Software Defined Network Controller and RADIUS Proxy for FTTH / FTTB retail and wholesale subscribers of Deutsche Telekom.
- Golang
- Bare metal Kubernetes
- Docker
- Kafka (confluent-kafka-go, sarama)
- NATS Streaming
- gRPC
- gRPC gateway
- Etcd3
- REST
- RADIUS
- Network programming
- Prometheus
- Grafana
- Gin-gonic
- GitLab
- Helm
- CI/CD
- Microservices
Jul 2018 - Jun 2020
2 years Langenfeld, Germany
Backend Architect and Developer / DevOps Engineer
Xarvio-BASF
- Design and development of a new service platform based on Kubernetes.
- Migration of existing infrastructure and Java services to Kubernetes.
- Development in area of application security, backend service engineering, proof of concepts, service monitoring and alerting.
- Design and development of image processing pipeline using TensorFlow GPU, AWS Batch, Step Functions and Lambda.
- Java
- Spring Boot
- Spring Cloud
- Golang
- Python
- WebSockets
- AWS
- Kubernetes
- Docker
- Helm
- Linkerd2
- Chartmuseum
- KOPS
- EKS
- Postgres RDS
- RabbitMQ
- Terraform
- Kubebuilder
- Packer
- Elasticsearch
- Kibana
- Calico
- Fluentd
- Filebeat
- Prometheus
- Alertmanager
- Grafana
- ElastAlert
- OpenTracing Zipkin / Jaeger
- OAuth2
- OIDC
- Autoscaling based on custom metrics
- Karpenter
- KEDA
- CI/CD
- TeamCity
- Kotlin DSL
- Argo CD
- IntelliJ
- GoLand
- AppDynamics
- Datadog
- DNS
- X.509 certificates management
- POC
- DevOps
- ARM
- Microservices
Jan 2016 - Jun 2018
1 year 6 months Cologne, Germany
Platform Developer
REWE Digital
- Development of Core Platform Services.
- New development of central push, SMS and E-mail communication services.
- Development of solution for secret management for microservices running in Kubernetes - sidecar for Vault initialization, unsealing and plugin registration, Vault Plugin and Client for Google G-Suite authentication, implementation of Spring Vault Auth Backend with Kubernetes Service Account Token – contribution to Spring Vault and Spring Cloud Vault.
- Development of Prometheus exporters for service monitoring, Kafka JAAS SASL module for dynamic user management, Golang prototype of Kafka Proxy (TLS client certificates check, local SASL authentication, additional handshake for authentication with Google-ID JWT Token, K8S sidecar, SOCKS5).
- Support in the cloud transformation project – migration of an existing on-premise eCom platform to Google Cloud Platform (Kubernetes, networking, routing, DNS, VPN, shared VPC, K8S service broker / service catalog).
- Golang
- Java 8
- Spring Boot 1.5/2.0
- RxJava
- Project Reactor
- Microservices
- Kubernetes
- Google Cloud Platform
- Docker
- Docker Swarm
- Consul
- Prometheus
- Grafana
- PostgreSQL
- Redis
- Apache Kafka
- OAuth2
- Swagger
- REST
- JSON
- WebSocket
- HashiCorp Vault
- Terraform
- APNS (Apple Push Notification Service)
- FCM (Firebase Cloud Messaging)
- Nexmo SMS
- IntelliJ
- Logstash
- Kibana
- GIT
- Stash
- Linux
- Ansible
- Jenkins
- HipChat
- JIRA
- CI / CD
- Load balancing
- Blue-Green deployment
- Service Discovery
- Scrum
Sep 2016 - Dec 2016
4 months Cologne, Germany
Senior Java Backend Developer
REWE Digital
- Development of a basket service used by REWE online-shop delivery service.
- Software enhancements and migration to support new marketplace architecture.
- Java 8
- Microservices
- Docker
- Spring Boot
- Play 2 for Java
- Apache Kafka
- Event Sourcing
- PostgreSQL
- Redis
- Liquibase
- JUnit
- Spock Framework
- OAuth2
- REST
- JSON Jackson
- IntelliJ
- Immutables
- ELK
- GIT
- Stash
- Linux
- Bamboo
- HipChat
- JIRA
- Continuous Integration
- Load balancing
- Blue-Green deployment
- Scrum
Sep 2015 - Aug 2016
1 year Berlin, Germany
Senior Java Backend Developer
Zalando SE / Zalando Payments SE
- Development of the Risk Management Backend Services in the Post Order Layer used for order screening and fraud detection.
- Design and prototyping of feature API gateway, distributed stream processing, data indexing and data lake repository for new risk-management platform.
- Developer of high-level interface for event bus infrastructure over Kafka-like queues with automatic failover, load distribution between consuming clients, offset management and leader election.
- Java 8
- Microservices
- AWS
- Docker
- Spring Boot
- Spring Cloud
- Spring MVC
- RxJava
- Apache Kafka
- Netflix Hystrix
- Solr / SolrCloud
- PostgreSQL
- DynamoDB
- ElasticSearch
- Kibana
- Cassandra
- Guava
- REST
- Swagger
- SOAP
- SoapUI
- OAuth2
- Zookeeper / Netflix Exhibitor
- Zuul Proxy
- Spring Cloud Config
- Netflix Archaius
- JSON Jackson/GSON
- Yaml
- Multithreading
- JMS/HornetQ
- Junit
- Mockito
- WireMock
- AssertJ
- Maven
- Load balancing
- Blue-green deployment
- GIT
- HipChat
- JIRA
- Stash
- GitHub Enterprise
- Linux
- Scrum
- Kanban
- Code reviews
- Technical solution design
- Zalando STUPS platform
Sep 2013 - Sep 2015
2 years 1 month Cologne, Germany
Senior Java Backend Developer / Technical Architect
HRS Group
- Development and design of infrastructure and framework components in a multi-datacenter system for HSA4 (Hotel Self Administration) project.
- Development of inventory, reservation and booking engine services, distributed and off-heap caching solutions, multicast-based service discovery and audit solution.
- Agile Software Development with Scrum and Kanban, prototyping, performance and last testing, micro-benchmarking, application profiling, GC tuning.
- Server Side Core Java Development
- Technical Architecture
- E-Commerce
- NoSQL
- Apache Cassandra
- CQL3
- DataStax OpsCenter
- Redis / Sentinel
- Distributed Caching
- Twitter Twemproxy - Nutcracker
- Ketama consistent hashing
- Distributed tracing - Zipkin
- sun.misc.Unsafe
- Off-Heap Memory
- Memory-Mapped Files
- SQL
- MySQL
- Spring
- AOP
- Hibernate
- JPA2
- CI / Jenkins
- HTTP
- Multithreading
- Reflection / CGLIB
- Java Profiling / Java Mission Control
- JProfiler 7
- Microbenchmarking – Caliper/ JMH
- Azul jHiccup
- Guava
- JEE
- JBoss 7
- Linux / CentOS Enterprise
- JMeter
- JUnit
- MBeans
- REST
- JSON/Jackson
- Messaging
- JMS / HornetQ
- Proxy/ SQUID
- Load Balancing
- Service Discovery/ Multicast
- IGMPv3
- Wireshark
- Maven
- SVN
- GIT
- Gerrit
- Eclipse
- IntelliJ IDEA
- JIRA Agile
- Puppet
- Ubuntu Desktop
- Vagrant
- AMQP / RabbitMQ
- ReactiveX / RxJava
- AWS cloud computing
- Protocol Buffers
- Aerospike
Jun 2013 - Aug 2013
3 months Hamburg, Germany
Senior Software Developer Java EE
Otto Group
- Development of an enterprise-wide high performance Java EE based backend e-commerce system (B2C - eCommerce Services Platform).
- Java EE
- Glassfish
- Spring
- AOP
- Oracle DB
- Hibernate
- JPA
- Jenkins
- JIRA
- Confluence
- JUnit
- Mockito
- WebServices
- JAX-B
- XSD
- SOAP
- WSDL
- REST
- JSON/GSON
- CommonJ
- YourKit Profiler
- SVN
- Ant
- Maven
- Eclipse
- SOAP-UI
- Wireshark
- Iptables
- SUSE Enterprise Linux
- Ubuntu Desktop
Jan 2011 - May 2013
1 year 5 months Bonn, Germany
Senior Software Developer
Deutsche Telekom AG
- Generic Data Pass enhancements - Phase 3, 4 and 5.
- Enhancements of online charging server (backend development in Java, system average/peak load per node – 500/3000 requests per second, availability ~99,999%) to comply with new EU regulations for data roaming overarching spending cap for prepaid and postpaid customers (Opt-In/Opt-Out).
- Implementation of internal and external rating module (eRAT interface), ARP (automatic repurchase pass) logic and pass logic for business customers.
- Development of rating functionality for domestic and roaming traffic (allowances, daily usage charges, notifications) replacing Alcatel-Lucent rating enabler legacy platform.
- Implementation of SOAP server service to receive subscription changes notifications from cNTDB through SOA-Backplane ESB (Enterprise Service Bus), adaptation of Diameter-Gy interface to support IPv6.
- Development of Wireshark dissectors for ANS.1 based protocols (LUA language) and simulators in Python - socket programming.
- Development of consistency check, configuration and administration tools.
- Agile software development using Scrum, integration and performance tests.
- Production support, PCAP and ticket analysis.
- RTSP (Real Time Service Platform)
- Java 5.0/6.0
- Python
- TCP/IP
- SOAP
- XSD
- Web Services
- WSDL
- JAX-B
- SOAP-UI
- HTTP
- Diameter
- LDAP
- CI Hudson/Jenkins
- EMMA Coverage
- Eclipse
- LUA
- Oracle 10g
- SQL
- PL/SQL
- SQL Developer
- XML
- Solaris 10
- Linux / Ubuntu Desktop
- PlantUML
- Apache CXF
- HTTP 1.0/1.1 Chunking
- Ant
- JUnit
- EasyMock
- JSON/Jackson
- Wireshark
- Thark
- Editcap
- Capinfos
- OTE
- IPS
- ClearCase
Jul 2011 - Dec 2011
6 months Germany
Senior Software Developer
Deutsche Telekom AG
- IDRP SSD.
- Enhancements of INOX OCS to control bandwidth consumption with SSD (Speed Step Down / Up) functionality.
- Implementation of new SOAP interface to the PCRF server (Policy And Charging Function), monthly recurring passes for domestic traffic based on pass subscription profiles, load balancing (horizontal scalability) achieved by subscriber stickiness.
- Optimisations to avoid mass interaction between OCS, PCRF and GGSN for end of month scenario (signalling storm prevention), modification in charging and ticketing, „Social Hours“ feature.
- Performance testing and tuning with a target to control full data roaming and domestic traffic.
- LDAP
- SOAP
- HTTP
- Diameter
- Seagull - Multiprotocol Traffic Generator
- IPS
- Java 5.0
- Oracle 10g
- Solaris 10
- Linux / Ubuntu Desktop
- Wireshark
- CI Hudson/Jenkins
- Junit
- Ant
- Make
- NSN RTSP v8.1
- Huawai GGSN
- Huawai UGW
- cTNDB (One-NDS8.0)
- PCRF (AAA-5.0.2)
Dec 2010 - Jun 2011
7 months Germany
Senior Software Developer
Deutsche Telekom AG
- IDRP - International Roaming Data Pass (Travel & Surf).
- Implementation of INOX Server (OCS - Online Charging Server) on the NSN RTSP (Real-Time System Platform) based on Diameter protocol, allowing roaming subscribers using vouchers for international data traffic.
- Integration with Huawei GGSN Diameter Credit Control Interface (Gy Interface), LDAP to CNTDB-HLR, Integration with Landing Page using ESX interface, accounting, charging, ticketing.
- International Roll-out for T-Mobile Germany, Austria and Netherlands.
- Diameter RFC 3588, RFC 4006, 3GPP TS 32.299, 3GPP 29.060, 3GPP 29.061.
- Java 5.0
- JUnit
- Emma Coverage
- EasyMock
- Wireshark
- Solaris 10
- Linux
- Oracle 10g
Mar 2010 - Nov 2010
9 months Germany
Senior Software Developer
Deutsche Telekom AG
- NGIN/INSV8.1 (New Generation Intelligent Network).
- Evaluation and tests of NSN IN Advantage 8.1 platform and SCE (Service Creation Environment).
- Development of test services for SS7, HTTP, SOAP, Diameter, LDAP, ESX interfaces.
- Refactoring, redesign and migration of T-Mobile Primo Services.
- Implementation of new LDAP interface to cNTDB (RFC 4511, RFC 4515).
- System online testing with IPS using OGW (Omni Gateway) and Signalware Sigtran.
- Ant
- Java 5.0
- Eclipse
- Wireshark
- Bash scripting
- OpenLDAP
- ApacheDS
- Oracle 10g
- Linux
- Solaris 10
Jun 2009 - Mar 2010
10 months Germany
IN Application Developer
Deutsche Telekom AG
- Design and implementation of MOC, MTC, Web Initiated Calls and USSD IN-Services in project “Office Connect”.
- Leg management, call forwarding, call deflection, call pickup, A- and B-side call transfer, sequential call hunting, parallel ringing, mid-call features, charging and ticketing, rerouting from VPLMN to HPLMN, User-to-User signalling, service retriggering, ATI (Any Time Interrogation).
- Coding and decoding of CAMEL structures (ASN.1 BER), integration with Primo MultiSIM, MNP, HomeZone and VDA services, LDAP (CNTDB) and IP Centrex integration.
- Usage of ITU-T, ETSI and 3GPP standards e.g. 3GPP TS 29.078 v8.0.0, 3GPP TS 29.002 v8.10.0, 3GPP TS 24.008 v8.6.0, ITU-T Q.1218, ITU-T Q.763, ITU-T Q.931, ITU-T Q.716.
- SCP / NSN IN Advantage 7.5
- SLEE
- OTE
- IPS
- SS7 (INAP - SINAP7m+, CAP, MAP)
- ASN.1
- OIF Online Interface
- JUnit
- EasyMock
- SunOS
- Oracle
- Eclipse
- JBuilder
- Java 1.2/1.6
- JBoss Netty
Feb 2009 - May 2009
4 months Germany
IN Application Developer
T-Mobile International
- Implementation of LI (Legal Interception), T-VPN Call Manager and 0700 DTMF administration menus modules in project RINN (Replacement IN North) for NSN (Nokia Siemens Networks) Advantage V7.5 platform.
- SCP / NSN Intelligent Network Advantage 7.5
- SLEE (Service Logic Execution Environment)
- T-INAP (Telekom Intelligent Network Application Part)
- ASN.1
- OIF (Online Interface)
- Offline testing with OTE
- Online testing with IPS
- Java 1.2
- Java 1.6
- JUnit
- EasyMock
- Shell Scripting
- Python 2.4
- CORBA
- SunOS
- Oracle
- Eclipse
- JBuilder
Aug 2008 - Jan 2009
6 months Bad Homburg, Germany
Senior System Developer
ATIS Systems GmbH
- Design and implementation of an E-Mail and IP CTI (Core Transfer Interface) in project „Klarios NG” (telecommunication law interception and recording solution).
- Mass data processing and transfer; back processing, communication with F3S (Flexible Scalable Storage Solution) using Java New I/O, provisioning of the search engine feeder and indexing services.
- Writing of technical concepts in English; activity, sequence and class diagrams.
- Conception of a recovery processing, last and performance tests.
- Java 6
- Oracle 11g
- Oracle AQ
- Derby DB
- Magic Draw
- Subversion
- JPA Java Persistence API
- Hibernate
- Spring
- AOP Aspect Oriented Programming
- Eclipse
- JUnit 4
- XML
- JAXB
- Ant
- Multithreading (Concurrency Framework, Transient Queues, synchronous and asynchronous communication)
- Connection Pooling
- FTP (Jakarta Net)
- Linux
- AIX
May 2008 - Jul 2008
3 months Germany
Senior Software Developer
T-Mobile Germany
- Implementation of an application business logic and licence management for a ngVMS (new generation voice mail system) administration.
- Connection to ESB Enterprise Service Bus (SOA Backplane).
- Java JDK 6.0 (Linux)
- JUnit
- Ant
- Oracle 10g
- Hibernate
- Spring (Java/J2EE application framework)
- Apache CXF (SOAP)
Jan 2008 - Apr 2008
4 months Germany
Senior Software Developer
T-Mobile Germany
- Redesign and refactoring of SPC (Service Provisioning Component) and HCS (Handset Capability Server) interfaces.
- Usage of Dynamic MBeans for module online administration.
- Java JDK 5.0
- JUnit
- Ant
- Oracle 10g
- JDBC
- Hibernate
- Spring
- Axis
Jul 2007 - Dec 2008
6 months Germany
Software Developer
T-Mobile Germany
- Design and implementation of a module for an administration of the Siemens IN (Intelligent Network) – CORBA interfaces for MNP, HomeZone and MultiSim.
- Java JDK 5.0
- JUnit
- Ant
- CORBA (JacORB)
- Oracle 10g
- Castor
Apr 2007 - Jun 2007
3 months Germany
Software Developer
T-Mobile Germany
- Design and development of a Java plug-in for a data supply to a VPN (Virtual Private Network) administration system.
- Sun ONC/RPC (Remote Procedure Call) protocol as a connection between the systems.
- Usage of multithreading and transient queues.
- Java JDK 5.0
- JUnit
- Ant
- Concurrency Utilities
- ONC/RPC for Java
- Oracle 10g
Dec 2006 - Mar 2007
4 months Germany
Software Developer
T-Mobile Germany
- Development of a persistence layer for a database module.
- Own generator for Java model classes, stored procedures, Hibernate Named Query classes and Hibernate mapping declaration files.
- Parallel provisioning, automatic new model verification, JUnit tests generator.
- Porting a C++ logic to Java.
- C++ (Solaris)
- STL
- Java JDK 5.0 (Linux)
- Apache Betwixt
- XML
- XSLT
- XALAN
- DOM4J
- Oracle 9i/10g
- PL/SQL
Oct 2006 - Nov 2006
2 months Germany
Software Developer
T-Mobile Germany
- Porting of C++ XOR-Provisioning module (Xtra Online Rating) to Java.
- Additional development of test client and mock server.
- Multithreading, transient queues, queue monitoring, own connection pool implementation, unit and last tests.
- Java JDK 5.0
- JUnit
- Ant
- Concurrency Utilities
Jan 2005 - Sep 2006
9 months Germany
Software Developer
T-Mobile Germany
- Analysis, design, and implementation of a new provisioning interface (SOA Approach) between Customer Care and Core Network Administration.
- Prototyping, conception of a gradual migration of business processes, Tibco-Adapter development, own class generator for XML to C++ binding.
- Writing documentation in English, Rational Rose modelling – collaboration and class diagrams.
- XMLBeans
- XML Schema
- Xerces
- Tibco XML Tunnelling
- Java
- Multithreading
- C++
- STL
- Oracle 9i (CLOBS,BLOBS)
- JUnit
Sep 2005 - Dec 2005
4 months Germany
Software Developer
T-Mobile Germany
- Enhancements of provisioning system for project "Homezone" (mobile@home).
- Workflow and models modifications for new IN-Profiles, UCSI-Triggers (USSD CAMEL Subscription Information) provisioning to Subscriber Mediation Device, stored procedures development.
- C++
- STL
- Oracle 9i
- Power Designer
Jul 2005 - Aug 2005
2 months Germany
Software Developer
T-Mobile Germany
- Application functionality enhancement for "Combi-Card Teens" product processing.
- Modifications in CRM-Workflow and Messaging System.
- Development of new Send/Receive Tibco-Adapters.
- Database conceptual and physical data models enhancement, storage procedures development.
- C++
- STL
- Java
- Oracle 9i
- Tibco
- Power Designer
Apr 2005 - Jun 2005
3 months Germany
Software Developer
T-Mobile Germany
- Development of a bridge server between CRM and Ericsson MMSC-Proxy.
- Development of MMSC simulation application.
- Conception, interface design - IDL,WSDL.
- Performance and stress tests.
- Java
- CORBA(JacORB)
- SOAP(AXIS)
- Multithreading
- Ant
May 2004 - Sep 2004
5 months Germany
Software Developer
T-Mobile Germany
- Development of application for request processing for Identity Server Administration (IDS).
- Application functionality enhancement for new activation, adding and deletion of BPR-Option, adding and deletion of TwinCard/TwinBill-Option, contract termination, change number processes.
- Development of functionality for CRM workflow business processing, new services in remote agent, routing to Tibco-Agent.
- SUN Solaris
- C++
- STL
- Oracle
Feb 2004 - Mar 2005
1 year 2 months Germany
Release Manager
T-Mobile Germany
- Release Management in Project SMD (Subscriber Mediation Device), Budget approx. 1 million EUR p.a.
- System release planning, preparation of annual budget, budget forecast, resource planning, budget and cost monitoring, time and man-power estimation, project plan/time scheduling preparation, external work commissioning.
Dec 2003 - Jun 2004
7 months Germany
Software Developer
T-Mobile Germany
- Development of iSPC system (International Service Provisioning Component).
- Connecting CRM System to Subscription Server and Service Portals.
- Database design and development of workflow system for request processing and administration of network related events.
- Development of send, receive, micromanagement processes.
- Oracle
- Java
- JDBC
- Multithreading
- Power Designer
Jun 2003 - Sep 2003
4 months Germany
Software Developer
T-Mobile Germany
- Development of Lock-Server for lock/unlock request processing for GSM-Service SMS-MO (subproject “Warm Billing for Prepaid”).
- Complete conception, design, data modelling and development of database parts and new workflow.
- Service development for Customer Care and Customer Billing, data migration, population scripts.
- SUN Solaris
- C++
- STL
- Oracle
- UML
- OOA
- OOD
Apr 2002 - Oct 2002
7 months Germany
Software Developer
T-Mobile Germany
- Development of batch application for MNP-Porting requests processing (Mobile Number Portability).
- Connecting to MRI (Master Routing Interface).
- Development of Central Master Routing Database simulation application and stored procedures for MNP-Helpdesk.
- Oracle
- C++
- STL
- Java
- JDBC
- Shell-Script
Jan 2002 - Jun 2003
1 year 6 months Germany
Software Developer
T-Mobile Germany
- Development and support of online prepaid load system of T-Mobile Germany.
- Building of database system for persistent storage of online-prepaid business processes.
- Designing of concept for database migration with warranty of 99% operational availability.
- Development of database jobs and SAP data transfer.
- DB-Tuning, DB-Monitoring.
- Oracle
- Shell-Script
Nov 2000 - Mar 2005
4 years 5 months Germany
Software Developer / Project Carmen
T-Mobile Germany
- Development of Stored Procedures, Database Tuning in Project Core Network Administration and Resource Administration of T-Mobile Germany.
- Data Model enhancements, migration scripts and database patches.
- VLDB (Very Large Database) – Tables with 300 million records.
- Failure and performance analysis.
- Performance improvements by table partitioning, function based indexes, materialized views and replication.
- Development of logistic and distribution batch applications, CRM Workflow processing jobs, communication with external systems.
- Large and complex software project, development team ca. 300 people including 45% of software developers.
- Oracle 7/8i
- SQL
- PL/SQL
- C++
- STL
- Shell-Script
- Power Designer
Jul 1999 - Oct 2000
1 year 4 months Poland
Software Developer
Industrial and Financial Systems Poland
- Further development of Swedish ERP System (IFS Applications), Modules: Finance, Distribution, Maintenance, software adjustment to Polish law, enhancements of Data Models and GUI, Performance Tuning.
- Oracle 8
- SUN Solaris
- PC-Clients
- Centura
Languages
Polish
Native
English
Advanced
German
Advanced
Spanish
Elementary
Education
Kielce University of Technology
Bachelor · Management and Marketing · Kielce, Poland
Kielce University of Technology
Master's Degree · Computer Science · Kielce, Poland
Certifications & licenses
AWS Certified Developer Associate Level
Amazon Web Services
Oracle Certified Professionalist in 8i/9i
Oracle
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