Denis Hamann

Architect & Senior Cloud Developer - NEO OCR

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Hamburg, Germany

Experience

Jul 2022 - Present
3 years 7 months

Architect & Senior Cloud Developer - NEO OCR

Santander Consumer Technology Services GmbH

  • Led the design and implementation of a cloud-based OCR system for document classification in the sales process
  • Structured the preparation of classified documents via REST APIs in the AWS environment
  • Designed the architecture and communicated with stakeholders
  • Proactively aligned compliance
Jan 2021 - Sep 2022
1 year 9 months

Senior Backend Developer - Order Management / Sourcing

MediaMarktSaturn Group

  • Designed and implemented a new sourcing microservice in a hexagonal architecture based on Domain-Driven Design
  • Introduced modern development patterns (CI/CD, clean code coaching)
  • Harmonized APIs and events across business areas by collaborating with other teams
  • Coordinated integration interfaces with enterprise architects
Oct 2020 - Mar 2021
6 months

MongoDB Specialist - Mongo Cluster Upgrade & Optimization

Techniker Krankenkasse

  • Migrated an existing MongoDB cluster to the latest version
  • Simplified the setup and added infrastructure-as-code patterns
  • Optimized clustering, sharding, replica sets and backups
Oct 2019 - Dec 2020
1 year 3 months

Senior Backend Developer, DevOps - Partner Platform

Otto GmbH & Co KG

  • Developed several new microservices to support additional partner data sources for the partner platform
  • Took a lead role in architecture design and service implementation
  • Integrated existing processes into the AWS environment after discussions with platform stakeholders and partner developers
Jul 2018 - Sep 2019
1 year 3 months

Backend Developer, DevOps - MMDB-Switch

Otto GmbH & Co KG

  • Developed several new microservices to replace a legacy monolith
  • Took a leading role in architecture design and implementation
  • Designed APIs, tested and ensured functionality after deployment
  • Conducted follow-ups and coordinated with stakeholders and other development teams
Apr 2018 - Sep 2018
6 months

Backend Developer, DevOps - AWS Migration

Otto GmbH & Co KG

  • Migration of around 30 microservices from an external hosting infrastructure to AWS
  • Optimization of the architecture using serverless Lambdas and Kinesis
  • Full-stack development tasks and DevOps (routing, user management, network peering)
  • Building the Amazon infrastructure from scratch
Jan 2017 - Mar 2018
1 year 3 months

Android Developer - yomo

Star Finanz GmbH

  • Development of the YOMO mobile app to manage bank accounts as an Android developer
  • Introduction of a testing culture with automated unit and UI tests in the continuous integration system
  • Advice on stress tests and migration of the codebase to Kotlin
Apr 2016 - Dec 2016
9 months

Mobile Developer

Norddeutscher Rundfunk

  • Development of a modular app platform for multiple radio and TV stations on Android and iOS
  • Introduction of a test-driven culture with unit and component tests in the CI setup
  • Improvement of the build process and app quality
Apr 2016 - Jun 2016
3 months

Web Developer, Consultant

myDriver

  • Analysis of ongoing database issues in the BI department
  • Advice on technical and organizational levels
  • Development of a one-page application with AngularJS and Bootstrap for BI optimization
Jul 2015 - Mar 2016
9 months

Consultant, System Architect

Lufthansa Technik

  • Technical and business analysis for the reimplementation of a capacity management application
  • Communication with stakeholders and requirements gathering
  • Evaluation of available technologies and architecture design
  • Definition of a data migration plan and roadmap
  • Migration of over 500 users from MS Access to a web-based, LDAP-integrated application
Jul 2014 - Mar 2015
9 months

Developer - Chair of Computer Science in Cultural Studies

University of Bamberg

  • Prototype development for dynamic game boards in geo games using public data
  • Research and integration of OpenStreetMap data
  • Development of a k-nearest neighbors algorithm for game board evaluation
  • Creation of a web service based on GraphHopper route calculations
Apr 2014 - Sep 2015
1 year 6 months

Consultant, System Architect

Lufthansa Technik

  • Evaluation of the existing MS Excel solution as a basis for a production planning application
  • Requirements gathering with clients and IT departments
  • Design of a two-stage calculation algorithm to optimize machine utilization and staff availability
  • Implementation of an application for objective decision support
Apr 2014 - Mar 2015
1 year

Mobile Developer

Shinsolutions

  • Development of a beacon-based people search app for events
  • Focus on backend communication and Bluetooth interaction
  • Implementation of a solution to locate lost friends
Jul 2013 - Mar 2014
9 months

Mobile Developer

Fewclicks

  • Development of a proof of concept for beacon technology in retail environments
  • Technical analysis and stakeholder communication
  • Presentation of the prototype to the board and contract agreement for internal use
Jul 2013 - Mar 2014
9 months

Developer - Chair for Energy-Efficient Systems

University of Bamberg

  • Development of software for classifying the energy consumption of unknown households
  • Proof of concept using SVM and ANN
  • Web-based application with R Studio and custom feature vector design
  • Deployment of a web service for household characteristic prediction
Jul 2012 - Sep 2013
1 year 3 months

Research Assistant

GGS Heilbronn

  • Investigated the impact of shareholders on the IT capabilities of S&P500 companies
  • Developed custom software and SQL queries for data analysis
  • Conducted extensive ETL processes and validated hypotheses
Jul 2012 - Dec 2012
6 months

Project Manager

Pirelli Germany

  • Led the project to develop a premium lounge for tire dealers
  • Managed supplier communication and optimized the delivery process of lounge elements
  • Ensured a transparent process for the sales team
Apr 2011 - Sep 2011
6 months

SAP Developer

Pirelli Germany

  • Developed an ABAP dynpro for rim configuration in the POS system
  • Integrated a web view for visual preview of tires and rims
  • Rolled out to 84 dealerships and reduced the number of suppliers
Jul 2010 - Mar 2011
9 months

Java Developer

Pirelli Germany

  • Evaluated and developed an SNMP-based host monitoring solution
  • Designed architecture and algorithms for host-switch mapping
  • Integrated into Nagios and detected misconnected hosts
Jul 2010 - Mar 2011
9 months

Mobile Developer

Shinsolutions

  • Developed a white-label app and CMS for the Erbach Castle Association
  • Managed backend communication and differential file synchronization
  • Published the app and secured media coverage
Jan 2010 - Sep 2010
9 months

IT-Consultant

Pirelli Deutschland

  • Analysis and improvement of the Intrastat reporting process in SAP R/3
  • Identification of the most common errors and implementation in SAP transactions
  • Reduction of the error rate from over 70% to under 3%
Jul 2009 - Dec 2009
6 months

Web Developer

Pneumobil

  • Analysis and development of a web-based application for tire-rim combinations
  • ETL process for data migration and quality improvement from MS Access
  • Implementation of features to match tires, rims, and vehicle data
Jul 2007 - Jun 2008
1 year

Developer

Ralos

  • Software development to analyze and display energy yield from solar modules
  • Integration of a serial interface for power data collection
  • Web application for displaying historical solar data, awarded an innovation prize

Summary

Denis is a very experienced developer with broad experience in IT and implementation projects in the private and public sectors. He aims for pragmatic, business-oriented solutions with the lowest possible architectural complexity. He has expertise in backend development and loves solving complex problems in close collaboration with stakeholders.

Denis's work style is characterized by strong commitment, goal-oriented thinking and a relaxed approach. He is especially strong at problem solving and working towards goals and deadlines. He prefers working in teams where he can take responsibility and initiative.

Skills

  • E-commerce
  • Automotive Industry
  • Aerospace Industry
  • Research/academia
  • Banking And Finance
  • Public Sector
  • Applied Research
  • Software Industry
  • Solar Energy
  • Kotlin
  • Java
  • Spring
  • Spring Boot
  • Jpa
  • Aws
  • Gcp
  • Kubernetes
  • Event Sourcing
  • Jenkins
  • Gradle
  • Maven
  • Mongodb
  • Postgresql
  • Kinesis
  • Ecr
  • Ec2
  • Sqs
  • Sns
  • S3
  • Aws Lambda
  • Cloudwatch
  • Cloudformation
  • Kibana
  • Elastic Search
  • Grafana
  • Oracle
  • Mssql
  • Python
  • Android

Languages

German
Native
English
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