Denis Hamann - Architect & Senior Cloud Developer

Q: Where is Denis based?

Denis is based in Hamburg, Germany .

Q: What languages does Denis speak?

Denis speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Denis have?

Denis has at least 17 years of experience. During this time, Denis has worked in at least 19 different roles and for 16 different companies . The average length of individual experience is 1 year and 9 months . Note that Denis may not have shared all experience and actually has more experience.

Q: What is Denis's latest experience?

Denis's most recent position is Architect & Senior Cloud Developer - NEO OCR at Santander Consumer Technology Services GmbH .

Q: What companies has Denis worked for in recent years?

In recent years, Denis has worked for Santander Consumer Technology Services GmbH , MediaMarktSaturn Group , and Techniker Krankenkasse .

Q: Which industries is Denis most experienced in?

Denis is most experienced in industries like Retail , Banking and Finance , and Information Technology (IT) . Denis also has some experience in Automotive , Aerospace and Defense , and Education .

Q: Which business areas is Denis most experienced in?

Denis is most experienced in business areas like Information Technology (IT) , Product Development , and Business Intelligence . Denis also has some experience in Quality Assurance (QA) , Research and Development (R&D) , and Procurement and Purchasing .

Q: Which industries has Denis worked in recently?

Denis has recently worked in industries like Banking and Finance , Retail , and Insurance .

Q: Which business areas has Denis worked in recently?

Denis has recently worked in business areas like Information Technology (IT) , Product Development , and Procurement and Purchasing .

Recommended expert

Hamburg, Germany

Experience

Jul 2022 - Present

3 years 8 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

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Banking and Finance (5 years), Retail (5 years), Information Technology (3.5 years), Automotive (2.5 years), Aerospace and Defense (2 years), and Education (2 years).

Banking and Finance

Retail

Information Technology

Automotive

Aerospace and Defense

Education

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (15.5 years), Product Development (8 years), Business Intelligence (3.5 years), Quality Assurance (3 years), Research and Development (2.5 years), and Procurement (2 years).

Information Technology

Product Development

Business Intelligence

Quality Assurance

Research and Development

Procurement

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

Advanced

Profile

Created

August 2023

Last Update

March 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Denis based?

Denis is based in Hamburg, Germany.

What languages does Denis speak?

Denis speaks the following languages: German (Native), English (Advanced).

How many years of experience does Denis have?

Denis has at least 17 years of experience. During this time, Denis has worked in at least 19 different roles and for 16 different companies. The average length of individual experience is 1 year and 9 months. Note that Denis may not have shared all experience and actually has more experience.

What roles would Denis be best suited for?

Based on recent experience, Denis would be well-suited for roles such as: Architect & Senior Cloud Developer - NEO OCR, Senior Backend Developer - Order Management / Sourcing, MongoDB Specialist - Mongo Cluster Upgrade & Optimization.

What is Denis's latest experience?

Denis's most recent position is Architect & Senior Cloud Developer - NEO OCR at Santander Consumer Technology Services GmbH.

What companies has Denis worked for in recent years?

In recent years, Denis has worked for Santander Consumer Technology Services GmbH, MediaMarktSaturn Group, and Techniker Krankenkasse.

Which industries is Denis most experienced in?

Denis is most experienced in industries like Retail, Banking and Finance, and Information Technology (IT). Denis also has some experience in Automotive, Aerospace and Defense, and Education.

Which business areas is Denis most experienced in?

Denis is most experienced in business areas like Information Technology (IT), Product Development, and Business Intelligence. Denis also has some experience in Quality Assurance (QA), Research and Development (R&D), and Procurement and Purchasing.

Which industries has Denis worked in recently?

Denis has recently worked in industries like Banking and Finance, Retail, and Insurance.

Which business areas has Denis worked in recently?

Denis has recently worked in business areas like Information Technology (IT), Product Development, and Procurement and Purchasing.

What is the availability of Denis?

Denis is immediately available full-time for suitable projects.

What is the rate of Denis?

Denis's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.