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Frank LießnerFL

Frank Ließner

CTO | Engineering Manager | Mobile Games, Unity3D

€1,200/day
Berlin, DE
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Frank

Interim CTO & Tech Lead — Products from Idea to Market
I bring products from the initial idea to market success — digital and physical. In over 15 years as CTO, Co-CEO, and founder, I've learned what works: small teams, clear technical decisions, and a pragmatic bridge between development and business.

What I bring:
As Co-CEO and CTO of Fox & Sheep, I helped build one of Europe's leading children's app studios — 25+ apps, millions of downloads, award-winning. At Tiny Monster, I took a physical audio player from an Arduino prototype to a finished product, including two successful funding rounds.
I am at my strongest when I combine technical architecture with product strategy: designing systems, building and leading development teams, and always keeping the overall product in view.

My Focus Areas:
  • Interim/Fractional CTO for startups and scale-ups
  • Technical product strategy and architecture reviews
  • Team building and technical leadership
  • Mobile app development (iOS/Android, Unity3D)
  • Process optimization and scaling
Who I work for:
Startups and medium-sized companies that need technical leadership at the CTO level. Whether it's product launch, team building, technology evaluation, or technical validation of a new concept: I bring structure and deliver results.

Available immediately. Location Berlin, remote or hybrid.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Berlin (up to 50km)

Experience

  • Tiny Monster GmbH
    Co-CEO & Co-Founder
    E-COMMERCE
    January 2023 - January 2025 (2 years)
    Berlin, Germany
    • Development of a children's audio play player from idea to market readiness
    • Modeling of prototypes in 3D, hardware prototyping with Arduino
    • Technical strategy for the protection of audio data copyrights
    • Conception of backend systems and management of development
    • Successfully implemented startup company founding, including two funding rounds
    • Built company strategy and planned product portfolio
    • Analyzed production processes and identified optimization potentials
    • Development of the mobile app for writable media of the audio play player
    Product Development Technical project management Corporate strategy Business development Strategic planning
  • Fox & Sheep GmbH
    Co-CEO & CTO
    VIDEO GAMES AND ANIMATION
    January 2012 - Today (14 years and 7 months)
    Berlin, Germany
    • Co-CEO at one of Europe's leading children's app studios
    • Development of award-winning apps with Unity3D
    • Leading the development team for 25+ apps for iOS, Android, and Amazon
    • Responsibility for technical architecture and technical product strategy
    • Bridged the gap between development and business/product teams
    Technical project management Business development Front-End development Unity 3D Mobile Games
  • Wooga GmbH
    Game Developer
    VIDEO GAMES AND ANIMATION
    January 2006 - January 2012 (6 years)
    Berlin, Germany
    • Software architecture and software development of mobile games in C#/Unity 3D for iOS and Android

    • Coordination with backend systems
    • Performance optimization, feature development, UI development
    • Standardization of framework usage
    • Validation of various technical solution approaches
    • Recruiting
    Unity 3D software architect Mobile Games Front-End development Game Development

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Education

  • Diploma
    Technische Universität Dresden
    2008
    Diplom
  • Class B, C, CE (Truck)
    Klasse B, C, CE (LKW)

Skill set

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