Ilja Leyberman - Software Engineer/Architect (Tech Lead), Team Lead

Unna, Germany

Experience

Sep 2020 - Feb 2024

3 years 6 months

Stuttgart, Germany

Software Engineer/Architect (Tech Lead), Team Lead

Mercedes-Benz Tech Innovation GmbH

Software Engineer/Architect (Tech Lead) and Team Lead in Digital Retail/Aftersales for Mercedes-Benz Group AG.
Project: Development of various solutions in Digital Retail.
The project goal was implementing different solutions in the Aftersales area.
Implemented multiple interfaces for surrounding systems and integration of external devices like cameras, scanners, digital lockers.
Developed various interfaces in the Used Cars area.
Created several prototypes.
Supported UI/UX and Data Analytics.
Developed frontend and backend solutions.
Led Kubernetes migration.
Built CI/CD pipelines.
Communicated with the business unit.
Technical design of new solutions and team alignment.
Cross-team alignment.
Oversaw the full technology stack and related systems.
Documentation, preparing and conducting reviews, and supporting the team.
Coordinated releases and key milestones.
Technologies used: Angular 16, Java/Kotlin, REST, NPM, MS SQL, PostgreSQL, Kubernetes, HELM, GitHub Enterprise, Kafka, SCRUM.

May 2016 - Nov 2020

4 years 7 months

Lünen, Germany

Technical Lead in Innovation (R&D) / Senior IT Consultant

Brockhaus AG

As Technical Lead in Innovation (R&D):
Developed prototypes in various technologies related to the insurance industry and enterprise environment.
Supervised bachelor theses by students.
Supported the sales team at fairs and conferences.
Gave presentations and wrote articles for online and print media.
Focus areas: BiPRO, citizen development, no-code, low-code, DSL, NLP, open source and more.
openVALIDATION project - developed a DSL compiler for validating business rules in natural language (06.2018 – 11.2020, Client: Open Source):
openVALIDATION is a multilingual natural-language DSL compiler for validation rules. Rules in German or English can be translated into Java, C#, JavaScript, Python, and Rust.
The generated code is universal and can be used almost anywhere, in the frontend for form validation or in the backend at service entry (e.g. REST/SOAP).
Responsibilities: idea generation, prototype development, base architecture, managing a student team, supervising bachelor theses.
Resulting side projects: ov-language-server with Monaco and VS Code integration, OpenAPI openVALIDATION adapter, Vue.js adapter.
Technologies: ANTLR4, Handlebars, Java, Azure, Spring, Vue.js.
As Senior IT Consultant:
Advised insurance clients, including ERGO Group, on implementing the motor insurance system.
BiPRO/RNext project - worked on the cross-industry standardization project (01.2018 – 11.2020, Client: German insurance industry):
Contributed in the BiPRO technical RNext working group.
Developed new standards and prototypes, approved a reference implementation using OpenAPI Specification (Contract First) and Twelve-Factor App methodology.
Responsibilities: prototype creation, committee work.
Technologies: GitLab, Java, Spring, OpenAPI, DevOps, Cloud Native, Twelve-Factor App.
CJI/Campaign Management project - implemented processes for customer journeys for ERGO Group (09.2019 – 01.2020, Client: ERGO AG):
Built processes for managing customer journeys, including an app for capturing marketing campaigns.
Responsibilities: developed REST interfaces, orchestrated processes, connected cloud-native (AWS) microservices to insurer’s backend (HOST).
Technologies: AWS, Cloud Native, DevOps, Jenkins, GitHub Enterprise, Docker, Kubernetes, Java, Spring, JPA, AWS S3.
Development of a motor insurance system for ERGO Group (06.2016 – 03.2018, Client: ERGO Group):
Delivered a new system and migrated the old one.
Built the application flow.
Implemented the BiPRO TAA 423 standard service.
Responsibilities: team setup, architecture and technical design, BiPRO services development, API gateway for about 40 systems, orchestrated third-party services (e.g. credit check), backend (HOST) integration, validation rules implementation.
Technologies: .NET, C#, SOAP, Unity, Enterprise Architect, UML, TFS, PowerShell.
Optimized the insurance sales system of ERGO AG for mobile devices (05.2016 – 06.2016, Client: ERGO Group):
Optimized an insurance sales system for tablets.
Responsibilities: improved development processes and tools, usability, process automation, DevOps.
Technologies: .NET, C#, jQuery, JavaScript, HTML, CSS, Bootstrap.

Aug 2014 - Apr 2016

1 year 9 months

Dortmund, Germany

Senior Software Engineer / Senior .NET Software Engineer

Lexekon GmbH

Built a new enterprise platform for the energy sector.
Migrated from Java to Microsoft .NET.
Set up ALM infrastructure using .NET Framework, Visual Studio, TFS, NuGet, Trello.
Created build and deployment processes with PowerShell and Bash.
Project: new quality craft portal for municipal utilities (similar to MyHammer.de):
Developed a company-specific enterprise solution.
Delivered a quality craft portal.
Migrated and redeveloped energy efficiency tools.
Responsibilities: functional spec, technical design, infrastructure setup, core software architecture using DDD, implementation, documentation, knowledge transfer.
Technologies: .NET, C#, NancyFX, Mono, HTML, JavaScript, AngularJS, Bootstrap, responsive UIs, Linux, MongoDB, TFS, NuGet, RESTful API, cross-device responsive web apps.

Jan 2014 - Aug 2014

8 months

Founder

Exqse

Founded a startup: ExQse, a digital queue management system.
Business model: let waiting customers spend their wait time outside the physical queue.
Users scanned a QR code or used geolocation on their smartphone to join the queue and get a digital ticket.
No need to stay in the physical line; users were notified proactively when their turn was near or a few minutes before.
Offered a generic base system and two industry-specific solutions for amusement parks and medical practices.
Responsibilities: prototype development, team building, finding investors.
Technologies: ASP.NET, C#, AngularJS, Bootstrap, Microsoft Azure, MongoDB.

Apr 2013 - Jan 2014

10 months

Bergkamen, Germany

.NET Software Developer

Etos GmbH

ETOS GmbH, mainly Delphi-based, planned a tech switch to .NET.
Main tasks: prepare and execute migration, including code and infrastructure.
Major challenge: establish the technical foundation and introduce DevOps concepts.
Set up full ALM infrastructure using .NET Framework, Visual Studio, TFS, NuGet.
Created build and deployment processes.
Designed and built cross-platform web solutions for inventory management in ASP.NET 4.5 Web API, AngularJS, Bootstrap.
Transferred knowledge in .NET Framework, C#, OOP, DDD, DI, TDD, documentation.
Built core software architecture using DDD.
Technologies: ASP.NET, MVC4, Web API, C#, HTML, JavaScript, AngularJS, Bootstrap, responsive UIs, Windows Server 2012, Firebird SQL, TFS, NuGet.

Jan 2010 - Present

14 years 7 months

Author of the online book “Understanding C#”

Own Projects

Personal hobby project: writing a beginner’s C# book “Understanding C#” since 2011.
Published the collected material as an online book.
Occasionally add chapters.
Idea and execution.
Technology: .NET C#.

Apr 2009 - Apr 2013

4 years 1 month

Neuss, Germany

.NET Software Engineer / Architect

Autoonline Informationssysteme GmbH

Developed a central B2B online auction platform (speedonline.de).
Built and maintained the company’s custom framework.
Designed and developed other web-based solutions for auto damage management.
SPEEDonline auction/residual value platform for damaged vehicles (04.2009 – 04.2013):
Online marketplace/auction platform for damaged vehicles. Insurers or assessors list vehicles, used car dealers place bids.
Runs in about 26 countries, highly available.
Highlights: complex scalable caching for fast data access on large data sets in a cluster.
The system has many components across multiple cluster servers, with automated deployments for minimal downtime and fault tolerance.
Responsibilities: full development, design, implementation, improvements, architecture, infrastructure, deployment, failover, caching, performance tuning, scaling, documentation, training.
Technologies: ASP.NET, MVC3, C#, HTML, JavaScript, jQuery, Windows Server 2008, AppFabric, Oracle 11.2g, SQL Server 2008.
SPEEDonline Phoenix damage visualization (09.2010 – 01.2012):
Goal: visualize damage on accident vehicles from text reports (often faxed).
Data digitized via OCR or manually, cleaned and structured.
Damages assigned to predefined regions using a semi-manual WPF editor or automated mapping.
Developed a WPF editor for vehicle-specific damage models (2D image base, vectors).
Full technical design and development of editors and image generators (WPF, GDI+, WCF).
Integrated solution into existing infrastructure (data capture software, OCR process, SPEEDonline platform).
Trained data capture team and student assistants.
Designed a 3D/2D vehicle model showing ~80 damage regions.
Responsibilities: design, idea, implementation, enhancements, architecture, R&D, go-live.
Technologies: Oracle 11.2g, .NET, C#, WPF (MVVM), GDI+, WCF (Image Service).

Feb 2007 - Apr 2009

2 years 3 months

Dortmund, Germany

IT Consultant / Senior .NET Developer (Head of Development)

IVS-Media Agentur GmbH

Advised clients, designed and developed custom internet/intranet solutions, CMS systems (ContentXXL, DotNetNuke, Axinom).
Project coordination and team leadership.
Responsible for R&D and product-focused solutions (CML add-ons).
Internet and intranet portal for Movie Park Germany GmbH (2007-2008, Client: Movie Park Germany GmbH & Co KG / leisure parks):
Complete relaunch of existing internet portal.
Included applications like press archive, newsletter services, download area, context-sensitive navigation, editable graphics navigation.
Implemented many online campaigns, mostly in Adobe Flash/Flex.
Multilingual portal with country-specific content.
Responsibilities: consulting, design (usability, technical), templating, coding, project coordination.
Customized AxCMS .NET to improve editorial workflows.
Adapted custom modules to complex publishing/staging mechanisms.
Technologies: ASP.NET, C#, JavaScript, AxCMS.NET (Axinom), ContentXXL, Windows Server 2003, SQL Server 2005, Adobe Flash/Flex.
Internet/Extranet portal for Mark-E AG (2006-2008, Client: Mark-E AG / energy supplier):
Built portal with info and apps like energy-saving calculator, billing forms, online services for private and business customers.
Responsibilities: consulting, design (usability, technical), templating, coding, project coordination.
Technologies: ASP.NET, C#, JavaScript, ContentXXL, Windows Server 2003, SQL Server 2005, Adobe Flash/Flex.

Jan 2004 - Feb 2007

2 years 2 months

Freelancer

ClearSolutions IT Dienstleistungen

Acquisition, consulting, software development, web design, building company websites.
Developed software like “Labor-Fix” lab management for a chemical analysis lab (Chemo-Test GmbH and others).
Lab management system development (2005-2006):
Managed clients, suppliers, invoices linked to lab workflows.
Features: data archival, report generation, master data, user/group/rights management, area-specific admin rights, multi-user/check-in-check-out, XSL-based print layouts, analysis management (parameters/DIN standards/parameter packages), analysis-specific invoicing and reports, invoice management.
Responsibilities: consulting, technical design, full implementation, data model/app architecture.
Technologies: .NET C#, WinForms, Windows Server 2003, SQL Server 2005 Express.

Jan 2004 - Dec 2005

1 year

Developer of EasyCMS – Content Management System

Own Projects

Created a custom CMS to try out technologies.
EasyCMS is an FTP-based content management system.
Core: WYSIWYG editor and XHTML templating.
Web documents built and edited offline, then published via FTP.
Ideal for small web hosting without server installation.
Features: WYSIWYG editor, document/resource management, FTP-based publishing, dependency checking for docs/resources, XML database, XSL extensions, XHTML templating.
Benefit: no coding skills needed, just HTML. Templates editable with tools like Dreamweaver.
Idea and execution.
Used in projects like Wandmalerei-Art.de, Wohnzimmer-bild.de, Costablanca-Immobilien.net.
Technology: .NET C#, WinForms, XML, XSL, Windows PC, FTP, HTML, JavaScript.

Sep 2001 - Dec 2004

3 years 4 months

Dortmund, Germany

.NET/Java Developer

VEW Online Internet Service Agentur (RWE AG)

Worked in programming R&D.
Developed various CMS components.
Created data models and application architectures.
Led technical development of RWE internet and intranet.
RWE.com Internet/Intranet portal (2001-2004, Client: RWE AG / energy supplier):
Completely rebuilt RWE’s internet and intranet based on GAUSS CMS (now OpenText).
Portal in about 10 languages with country-specific content.
Continuously added apps like media center, PR campaigns, staff directory, football pool, etc.
Customized GAUSS CMS with the vendor for client needs.
Built reusable modules (navigation, tree operations, templating, etc.).
Responsibilities: templating, app development, data provisioning for external apps, data replication from intranet, GAUSS CMS customization, GAUSS ATT add-on development.
Technologies: Java, HTML, JavaScript, JRUN, GAUSS CMS, ATT add-on, Oracle DB, Windows 2000 Server.
MAN Ferrostaal internet portal (2003, Client: MAN Ferrostaal AG / metal & machinery):
Ported multilingual portal to custom CMS (today Onion.Net CMS).
Automated migration to minimize editorial work.
Expanded portal with new features.
Built more apps for MAN AG after phase one (e.g. online media center).
Responsibilities: templating, app dev, data migration, CMS dev to requirements.
Technologies: HTML, JavaScript, ASP.NET, C#, custom app server (.NET), Windows 2000 Server, SQL Server.
MAN Ferrostaal product catalog (2003, Client: MAN Ferrostaal AG):
Built an online catalog/shop for industrial clients with ordering and reservation.
Sold trams, buses, industrial plants, equipment.
Designed closely with the client.
Responsibilities: consulting, technical design, full implementation, data model/app architecture, documentation.
Technologies: ASP.NET C#, HTML, JavaScript, custom app server, Windows 2000 Server, SQL 2000.

Aug 2000 - Sep 2001

1 year 2 months

Aschaffenburg, Germany

Junior Java Developer

Softways AG

Developed internet/intranet applications.
Built web/rich client GUIs using Magic, Java AWT/Swing, JavaScript, HTML.
Contributed to Toll Collect terminal software.
Prototype for Toll Collect GmbH (toll billing system) (06.2001-09.2001):
Developed a prototype terminal client for toll fee billing.
Independently created a Java client in AWT and Swing.
Technologies: Magic, HTML, JavaScript, Apache, AS/400.
Online UI for fleet card billing system (2000, Client: UTA (Union Tank Eckstein) / fleet management):
Built a web UI.
Programmed web GUI with Magic and HTML.
Technologies: Magic, HTML, JavaScript, Apache, AS/400.