30.12.2025 aktualisiert

**** ******** ****
verifiziert
100 % verfügbar

Senior Software Engineer | Python, Rails, TypeScript & Elixir | Technical Mentor & Coach

Rothenburg ob der Tauber, Deutschland
Weltweit
30+ Years of Experience in Software Development
Rothenburg ob der Tauber, Deutschland
Weltweit
30+ Years of Experience in Software Development

Profilanlagen

profile-gerald-spreer-freelance.pdf

Über mich

30+ years building production software across full-stack web applications, legacy system modernization, and enterprise architecture. Quality-focused with 10+ years TDD practice and team mentoring experience. Available for both permanent and contract positions.

Skills

Java.Net FrameworkKünstliche IntelligenzMicrosoft AzureC#LinuxWeb EntwicklungE-CommercePerlPythonPostgreSQLMongoDBMySQLRuby On RailsTransformationsmanagementSoftwareentwicklungTypeScriptTestenErlangTest-Driven DevelopmentKotlinPytestAngularJSDockerElixir
Core Technical Stack:
  1. Python (PyTest, MongoDB, Postgres)
  2. TypeScript/Angular (NgRx, Jasmine - extensive enterprise experience)
  3. Ruby on Rails (13+ years, deep Rails philosophy expertise)
  4. Elixir, Rust (active personal development)
  5. Additional: C#/.NET, Java/Kotlin, Perl, Docker, Azure
Proven Track Record:
  1. Quality Champion: 10+ years Test-Driven Development practice, established testing frameworks at flaschenpost.de and MarktPilot
  2. Legacy Modernization Specialist: Successfully migrated Rails 2.x to Rails 4, Perl to Rails, Python to Java/Kotlin transitions
  3. Team Multiplier: Trained development teams at multiple companies in testing methodologies and best practices
  4. Leadership Experience: 10 years as CTO/Director at non-profit (Austin, Texas)
Recent Engagements:
  1. MarktPilot (2024-present): Quality lead, AI integration, Python to Java/Kotlin migration
  2. flaschenpost.de (2021-2024): Recruiting infrastructure, team training
  3. TUI Group (2015-2020): E-commerce, multi-year contract renewals
Differentiators:
  1. Medical domain expertise (nursing background, interested in medical tech)
  2. Low-level systems knowledge (microcontrollers, assembly, Linux since 1997)
  3. International experience (10 years USA, fluent English/German)
  4. Entrepreneur (co-founded eventx.de platform)
Published Work:
  1. Good Code :: Value At Different Levels (Medium)
  2. A Case for Testing (Medium)
  3. FLOSS Weekly Interview with Randal Schwartz (YouTube)
  4. Ergodox EZ Keyboard Interview
References Available: Verified contacts at flaschenpost.de, TUI Group, Rotabene Media

Location: Rothenburg, Germany | Remote-experienced since 2011

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2011

Sprachen

DeutschMutterspracheEnglischverhandlungssicherRussischGrundkenntnisse

Projekthistorie

Senior Full-Stack Engineer

MarktPilot, Stuttgart

Industrie und Maschinenbau

50-250 Mitarbeiter

Driving quality in spare parts pricing software through comprehensive automated testing strategies and performance improvements
• Coaching developers in advanced testing techniques and best practices
• Spearheading AI tools and integration by being part of the AI Focus Group

Technologies: Python, PyTest, MongoDB, Azure, Docker

eventx.de, Rothenburg

Founder, Partner

Internet und Informationstechnologie

< 10 Mitarbeiter

• Launched entrepreneurial venture creating an event platform connecting communities
• Built from ground up a scalable platform for local events and gatherings

Technologies: Ruby on Rails, Angular, Heroku, RSpec, Haml, Postgres

neusta consulting, Hamburg

flaschenpost.de

Konsumgüter und Handel

50-250 Mitarbeiter

• Built robust recruiting infrastructure for a high-volume food delivery operation
• Scaled hiring processes by maintaining multiple apps for driver recruitment
• Transformed team practices through comprehensive training in testing
methodologies and development standards

Technologies: TypeScript, Angular, Jasmine, NgRx, C#, .NET

sum.cumo Sapiens GmbH, Remote

Sonstiges

10-50 Mitarbeiter

• Modernized legacy Perl/Rails/Vue systems through strategic refactoring and architecture improvements
• Boosted code reliability through strategic quality improvements and expanded test coverage

Technologies: Ruby on Rails, RSpec, Perl, Test::Spec, SQL, JavaScript, Linux, Bash

Online Product Catalog, Rothenburg

Industrie und Maschinenbau

50-250 Mitarbeiter

• Modernized business operations with a streamlined online product catalog
• Transformed legacy infrastructure by migrating outdated data structures to
robust ActiveRecord architecture

Technologies: Ruby on Rails, AngularJS, Heroku, RSpec, Haml, Postgres

TUI Group, Berge & Meer, ALDI Reisen, Remote

neusta consulting

Internet und Informationstechnologie

50-250 Mitarbeiter

• Powered e-commerce growth across multiple online travel platforms handling package tours, cruises, and group bookings
• Elevated code standards by mentoring development teams in quality practicesand testing strategies

Technologies: Ruby on Rails, TypeScript, Angular, NgRx, Jasmine

Recycling App, City of Rothenburg

Rotabene Media GmbH

Medien und Verlage

50-250 Mitarbeiter

  1. Delivered cross-platform mobile solution providing recycling schedule management for municipal services
Technologies: Ruby on Rails, Angular, Ionic Framework, Jasmine

TUI Group, Bremen, Remote

neusta consulting

Internet und Informationstechnologie

50-250 Mitarbeiter

• Architected e-commerce solutions for a global tourism leader
• Integrated complex systems building an online shop bridging TYPO3 and SAP Hybris

Technologies: AngularJS, TYPO3, Extbase, Fluid, Solr, Jasmine, PHP, PHPUnit

Der Männerladen, Landshut, Remote

Konsumgüter und Handel

< 10 Mitarbeiter

• Created complete booking ecosystem for premium experiences like whisky tastings
• Expanded reach with native iOS and Android applications

Technologies: Ruby on Rails, RSpec, Heroku, Ionic Framework, AngularJS

Bohlen Design, Remote

Marketing, PR und Design

< 10 Mitarbeiter

• Delivered rapid development across multiple Ruby on Rails projects
• Modernized legacy systems by successfully migrating Rails 2.x applications to Rails 4

Technologies: Ruby on Rails, RSpec, Heroku, Postgres, HTML5, Google Maps API

TheMaker - OpenSource

Open Source, Project Lead

Internet und Informationstechnologie

< 10 Mitarbeiter

• Led international development team on open-source CMS platform

Technologies: Python, wxPython, Objective-C

Non-Profit Organization, Austin, Texas

Founder, Director and CTO

Öffentlicher Dienst

< 10 Mitarbeiter

• Built technology infrastructure from scratch for growing organization
• Engineered custom solutions including in-house tools, websites, and content management systems
• Drove communications through technical writing and multilingual content creation

Technologies: Python, HTML/CSS, XML/XSLT, Ruby on Rails, Cocoa Framework

FA Parks, Manchester, Remote

Industrie und Maschinenbau

< 10 Mitarbeiter

• Prototyped IoT solution for remote locker management systems

Technologies: Ruby on Rails, RSpec, Raspberry PI

Bewertungen

Kontaktanfrage

Einloggen & anfragen.

Das Kontaktformular ist nur für eingeloggte Nutzer verfügbar.

RegistrierenAnmelden