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Kevin Liebholz Senior Software Engineer
Profile

Senior Full-Stack Developer with 5+ years in startups shipping systems for high-volume transactions and high-frequency IoT data. My startup experience taught me how to move fast without breaking things, while my business background helps to align technical solutions with real-world needs. I thrive in fast-paced environments with diverse challenges, enjoy enabling teams, and am motivated by sustainability and growing into leadership.

Core competencies include Full-Stack Development, CI/CD, Test-Driven Development, Software Architecture, Feature Scoping, Product Development, Mentoring, Onboarding, Public Speaking, Process Development, Stakeholder Collaboration, and Team Leadership.

Highlights
Led development of a compliant advisory solution

Securing €300,000 in R&D funding and enabling video-based financial consulting.

Spoke at RailsConf 2023

On Turbo Streams in production, showcasing advanced real-time UI patterns with Hotwire and WebSockets

Initiated and lead a Backend Book Club

Fostering continuous learning and cross-team knowledge sharing.

Tech & Tools
Database: PostgresSQL, MySQL, Redis
Infrastructure: Docker, Heroku, AWS, NGINX
Frameworks & Languages: Ruby on Rails, Ruby, JavaScript, TypeScript, Python, Flutter
Testing & Monitoring: RSpec, Capybara, Cypress, Jest, Scout APM, Elastic, Grafana
Other: Bootstrap, Tailwind, Sidekiq, git
Professional Experience
Dec 2023 – presentDarmstadt, Germany | Hybrid
Senior Backend Developer, IoT Venture GmbH

Senior Backend Engineer with a focus on developing and enhancing the central data link platform for a leading manufacturer of data signatures and GPS trackers.

Additional responsibilities include participating in emergency standby on-call duties, facilitating team retrospectives, conducting internal technical talks and feature presentations, representing the brand as part of the Corporate Influencer Team, and serving as a first aider, fire protection, and evacuation assistant.

Achievments

  • •Elevated business model flexibility through the leadership in integrating a new payment provider (mollie)
  • •Conceptualized the SSO integration with one of our biggest customers, including stakeholder management
  • •Increased manufacturing speed by upgrading the manufacturing platform
  • •Improved tracker functionality by augmenting data insights and updating the communication protocol
  • •Supported a strategic carrier transition by providing complex data insights to management
  • •Ramped up testing from around 10% to around 90% with the team elevatating product quality and reliability
  • •Fostered team-wide learning by establishing a Backend Book Club
  • •Promoted technology careers to young students during Girls Day
    • Kevin Liebholz
    May 2020 – Nov 2023Frankfurt, Germany | Hybrid
    Software Engineer, portagon GmbH

    Full Stack Software Engineer for a white-label SaaS platform specializing in the digital distribution of financial products.

    Additional responsibilities include being an onboarding mentor and guiding junior staff, facilitating team retrospectives, conducting internal technical talks and feature presentations, shaping company culture by participating in the motivation team, and serving as a first aider, fire protection, and evacuation assistant.

    Achievements

  • •Leading the development of a compliant financial advisory solution, including video conferencing, which secured €300.000 in R&D funding
  • •Solved a longstanding bug through persistent audit and review, improving system reliability
  • •Integrating a liability umbrella for high-volume investment processing
  • •Designed and built a compliant internal invoicing tool, streamlining financial operations
  • •Developed processes so that the team could grow from 3 to 12 people
  • •Created department onboarding concept with structured documentation and mentorship
  • •Raised in-house product awareness by introducing & leading knowledge transfer and business-wide feature reviews
  • •Ramped up testing from near 0% to around 80% with the team elevating product quality and reliability
    • Feb 2014 – presentKarlsruhe, Germany | Remote
    Co-Owner & CTO, eFairSorger GbR (sidebusiness)

    Face-to-face consultancy for optimizing consumer electricity tariffs.

    Previous Experience
    Aug 2018 – Oct 2019Ulm, Germany
    CFO, EquilTec GmbH
    Jun 2018 – Dec 2018Tuebingen, Germany
    Education
    2019Barcelona, Spain
    Le Wagon Batch #341, Coding Bootcamp
  • •9-week coding Bootcamp
    • 2014 – 2018Tuebingen, Germany
    Eberhard-Karls-University Tuebingen, B. Sc. Economics & Business Administration
  • •Thesies: "How can Narcissists Be Motivated to Contribute to Collective Action?"
    • 2016Rohnert Park, CA, USA
    Sonoma State University, Semester abroad
    Impact
    Mentorship

    Mentor junior devs via FirstRubyFriend and internal onboarding, fostering confidence and clean code practices.

    interest_days gem, Open Source

    This gem provides the interest day factor calculation based on ISDA conventions.

    Languages
    German
    English
    Spanish
    Talks
    Going Native: Turbo Native & Strada

    Frankfurt Ruby Meetup, April 2024

    Hotwire: Applied Turbo 8

    Frankfurt Ruby Meetup, January 2024

    Speaker at RailsConf 2023 Atlanta

    Exploring the Power of Turbo Streams & ActionCable

    Advanced Turbo Stream - NOT a Chat

    Franfurt Ruby Meetup, January 2023

    Interests
    My cats|Surfing|Dancing (HipHop)
    Kevin Liebholz